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 #include <uapi/linux/ext4.h>
  44
  45 #include <linux/fscrypt.h>
  46 #include <linux/fsverity.h>
  47
  48 #include <linux/compiler.h>
  49
  50 /*
  51  * The fourth extended filesystem constants/structures
  52  */
  53
  54 /*
  55  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  56  * structures. these checks slow things down a lot
  57  */
  58 #define AGGRESSIVE_CHECK__
  59
  60 /*
  61  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  62  * bitmaps, maintains and uses them to check for double allocations
  63  */
  64 #define DOUBLE_CHECK__
  65
  66 /*
  67  * Define EXT4FS_DEBUG to produce debug messages
  68  */
  69 #undef EXT4FS_DEBUG
  70
  71 /*
  72  * Debug code
  73  */
  74 #ifdef EXT4FS_DEBUG
  75 #define ext4_debug(f, a...)                                             \
  76         do {                                                            \
  77                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  78                         __FILE__, __LINE__, __func__);                  \
  79                 printk(KERN_DEBUG f, ## a);                             \
  80         } while (0)
  81 #else
  82 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  83 #endif
  84
  85  /*
  86   * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
  87   */
  88 #define EXT_DEBUG__
  89
  90 /*
  91  * Dynamic printk for controlled extents debugging.
  92  */
  93 #ifdef CONFIG_EXT4_DEBUG
  94 #define ext_debug(ino, fmt, ...)                                        \
  95         pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt,    \
  96                  current->comm, task_pid_nr(current),                   \
  97                  ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__,       \
  98                  __func__, ##__VA_ARGS__)
  99 #else
 100 #define ext_debug(ino, fmt, ...)        no_printk(fmt, ##__VA_ARGS__)
 101 #endif
 102
 103 #define ASSERT(assert)                                          \
 104 do {                                                                    \
 105         if (unlikely(!(assert))) {                                      \
 106                 printk(KERN_EMERG                                       \
 107                        "Assertion failure in %s() at %s:%d: '%s'\n",    \
 108                        __func__, __FILE__, __LINE__, #assert);          \
 109                 BUG();                                                  \
 110         }                                                               \
 111 } while (0)
 112
 113 /* data type for block offset of block group */
 114 typedef int ext4_grpblk_t;
 115
 116 /* data type for filesystem-wide blocks number */
 117 typedef unsigned long long ext4_fsblk_t;
 118
 119 /* data type for file logical block number */
 120 typedef __u32 ext4_lblk_t;
 121
 122 /* data type for block group number */
 123 typedef unsigned int ext4_group_t;
 124
 125 enum SHIFT_DIRECTION {
 126         SHIFT_LEFT = 0,
 127         SHIFT_RIGHT,
 128 };
 129
 130 /*
 131  * For each criteria, mballoc has slightly different way of finding
 132  * the required blocks nad usually, higher the criteria the slower the
 133  * allocation.  We start at lower criterias and keep falling back to
 134  * higher ones if we are not able to find any blocks.  Lower (earlier)
 135  * criteria are faster.
 136  */
 137 enum criteria {
 138         /*
 139          * Used when number of blocks needed is a power of 2. This
 140          * doesn't trigger any disk IO except prefetch and is the
 141          * fastest criteria.
 142          */
 143         CR_POWER2_ALIGNED,
 144
 145         /*
 146          * Tries to lookup in-memory data structures to find the most
 147          * suitable group that satisfies goal request. No disk IO
 148          * except block prefetch.
 149          */
 150         CR_GOAL_LEN_FAST,
 151
 152         /*
 153          * Same as CR_GOAL_LEN_FAST but is allowed to reduce the goal
 154          * length to the best available length for faster allocation.
 155          */
 156         CR_BEST_AVAIL_LEN,
 157
 158         /*
 159          * Reads each block group sequentially, performing disk IO if
 160          * necessary, to find find_suitable block group. Tries to
 161          * allocate goal length but might trim the request if nothing
 162          * is found after enough tries.
 163          */
 164         CR_GOAL_LEN_SLOW,
 165
 166         /*
 167          * Finds the first free set of blocks and allocates
 168          * those. This is only used in rare cases when
 169          * CR_GOAL_LEN_SLOW also fails to allocate anything.
 170          */
 171         CR_ANY_FREE,
 172
 173         /*
 174          * Number of criterias defined.
 175          */
 176         EXT4_MB_NUM_CRS
 177 };
 178
 179 /* criteria below which we use fast block scanning and avoid unnecessary IO */
 180 #define CR_FAST CR_GOAL_LEN_SLOW
 181
 182 /*
 183  * Flags used in mballoc's allocation_context flags field.
 184  *
 185  * Also used to show what's going on for debugging purposes when the
 186  * flag field is exported via the traceport interface
 187  */
 188
 189 /* prefer goal again. length */
 190 #define EXT4_MB_HINT_MERGE              0x0001
 191 /* blocks already reserved */
 192 #define EXT4_MB_HINT_RESERVED           0x0002
 193 /* metadata is being allocated */
 194 #define EXT4_MB_HINT_METADATA           0x0004
 195 /* first blocks in the file */
 196 #define EXT4_MB_HINT_FIRST              0x0008
 197 /* search for the best chunk */
 198 #define EXT4_MB_HINT_BEST               0x0010
 199 /* data is being allocated */
 200 #define EXT4_MB_HINT_DATA               0x0020
 201 /* don't preallocate (for tails) */
 202 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 203 /* allocate for locality group */
 204 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 205 /* allocate goal blocks or none */
 206 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 207 /* goal is meaningful */
 208 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 209 /* blocks already pre-reserved by delayed allocation */
 210 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 211 /* We are doing stream allocation */
 212 #define EXT4_MB_STREAM_ALLOC            0x0800
 213 /* Use reserved root blocks if needed */
 214 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 215 /* Use blocks from reserved pool */
 216 #define EXT4_MB_USE_RESERVED            0x2000
 217 /* Do strict check for free blocks while retrying block allocation */
 218 #define EXT4_MB_STRICT_CHECK            0x4000
 219 /* Large fragment size list lookup succeeded at least once for cr = 0 */
 220 #define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED             0x8000
 221 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
 222 #define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED              0x00010000
 223 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1.5 */
 224 #define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED             0x00020000
 225
 226 struct ext4_allocation_request {
 227         /* target inode for block we're allocating */
 228         struct inode *inode;
 229         /* how many blocks we want to allocate */
 230         unsigned int len;
 231         /* logical block in target inode */
 232         ext4_lblk_t logical;
 233         /* the closest logical allocated block to the left */
 234         ext4_lblk_t lleft;
 235         /* the closest logical allocated block to the right */
 236         ext4_lblk_t lright;
 237         /* phys. target (a hint) */
 238         ext4_fsblk_t goal;
 239         /* phys. block for the closest logical allocated block to the left */
 240         ext4_fsblk_t pleft;
 241         /* phys. block for the closest logical allocated block to the right */
 242         ext4_fsblk_t pright;
 243         /* flags. see above EXT4_MB_HINT_* */
 244         unsigned int flags;
 245 };
 246
 247 /*
 248  * Logical to physical block mapping, used by ext4_map_blocks()
 249  *
 250  * This structure is used to pass requests into ext4_map_blocks() as
 251  * well as to store the information returned by ext4_map_blocks().  It
 252  * takes less room on the stack than a struct buffer_head.
 253  */
 254 #define EXT4_MAP_NEW            BIT(BH_New)
 255 #define EXT4_MAP_MAPPED         BIT(BH_Mapped)
 256 #define EXT4_MAP_UNWRITTEN      BIT(BH_Unwritten)
 257 #define EXT4_MAP_BOUNDARY       BIT(BH_Boundary)
 258 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 259                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 260
 261 struct ext4_map_blocks {
 262         ext4_fsblk_t m_pblk;
 263         ext4_lblk_t m_lblk;
 264         unsigned int m_len;
 265         unsigned int m_flags;
 266 };
 267
 268 /*
 269  * Block validity checking, system zone rbtree.
 270  */
 271 struct ext4_system_blocks {
 272         struct rb_root root;
 273         struct rcu_head rcu;
 274 };
 275
 276 /*
 277  * Flags for ext4_io_end->flags
 278  */
 279 #define EXT4_IO_END_UNWRITTEN   0x0001
 280
 281 struct ext4_io_end_vec {
 282         struct list_head list;          /* list of io_end_vec */
 283         loff_t offset;                  /* offset in the file */
 284         ssize_t size;                   /* size of the extent */
 285 };
 286
 287 /*
 288  * For converting unwritten extents on a work queue. 'handle' is used for
 289  * buffered writeback.
 290  */
 291 typedef struct ext4_io_end {
 292         struct list_head        list;           /* per-file finished IO list */
 293         handle_t                *handle;        /* handle reserved for extent
 294                                                  * conversion */
 295         struct inode            *inode;         /* file being written to */
 296         struct bio              *bio;           /* Linked list of completed
 297                                                  * bios covering the extent */
 298         unsigned int            flag;           /* unwritten or not */
 299         refcount_t              count;          /* reference counter */
 300         struct list_head        list_vec;       /* list of ext4_io_end_vec */
 301 } ext4_io_end_t;
 302
 303 struct ext4_io_submit {
 304         struct writeback_control *io_wbc;
 305         struct bio              *io_bio;
 306         ext4_io_end_t           *io_end;
 307         sector_t                io_next_block;
 308 };
 309
 310 /*
 311  * Special inodes numbers
 312  */
 313 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 314 #define EXT4_ROOT_INO            2      /* Root inode */
 315 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 316 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 317 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 318 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 319 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 320 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 321
 322 /* First non-reserved inode for old ext4 filesystems */
 323 #define EXT4_GOOD_OLD_FIRST_INO 11
 324
 325 /*
 326  * Maximal count of links to a file
 327  */
 328 #define EXT4_LINK_MAX           65000
 329
 330 /*
 331  * Macro-instructions used to manage several block sizes
 332  */
 333 #define EXT4_MIN_BLOCK_SIZE             1024
 334 #define EXT4_MAX_BLOCK_SIZE             65536
 335 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 336 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 337 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 338 #ifdef __KERNEL__
 339 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 340 #else
 341 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 342 #endif
 343 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 344 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 345                                          EXT4_SB(s)->s_cluster_bits)
 346 #ifdef __KERNEL__
 347 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 348 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 349 #else
 350 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 351 #endif
 352 #ifdef __KERNEL__
 353 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 354 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 355 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 356 #else
 357 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 358                                  EXT4_GOOD_OLD_INODE_SIZE : \
 359                                  (s)->s_inode_size)
 360 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 361                                  EXT4_GOOD_OLD_FIRST_INO : \
 362                                  (s)->s_first_ino)
 363 #endif
 364 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 365 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 366         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 367                                                                   blkbits))
 368
 369 /* Translate a block number to a cluster number */
 370 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 371 /* Translate a cluster number to a block number */
 372 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 373 /* Translate # of blks to # of clusters */
 374 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 375                                  (sbi)->s_cluster_bits)
 376 /* Mask out the low bits to get the starting block of the cluster */
 377 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 378                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 379 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 380                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 381 /* Fill in the low bits to get the last block of the cluster */
 382 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
 383                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
 384 /* Get the cluster offset */
 385 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 386                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 387 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 388                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 389
 390 /*
 391  * Structure of a blocks group descriptor
 392  */
 393 struct ext4_group_desc
 394 {
 395         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 396         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 397         __le32  bg_inode_table_lo;      /* Inodes table block */
 398         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 399         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 400         __le16  bg_used_dirs_count_lo;  /* Directories count */
 401         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 402         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 403         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 404         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 405         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 406         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 407         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 408         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 409         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 410         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 411         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 412         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 413         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 414         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 415         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 416         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 417         __u32   bg_reserved;
 418 };
 419
 420 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 421         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 422          sizeof(__le16))
 423 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 424         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 425          sizeof(__le16))
 426
 427 /*
 428  * Structure of a flex block group info
 429  */
 430
 431 struct flex_groups {
 432         atomic64_t      free_clusters;
 433         atomic_t        free_inodes;
 434         atomic_t        used_dirs;
 435 };
 436
 437 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 438 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 439 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 440
 441 /*
 442  * Macro-instructions used to manage group descriptors
 443  */
 444 #define EXT4_MIN_DESC_SIZE              32
 445 #define EXT4_MIN_DESC_SIZE_64BIT        64
 446 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 447 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 448 #ifdef __KERNEL__
 449 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 450 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 451 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 452 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 453 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 454 #else
 455 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 456 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 457 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 458 #endif
 459
 460 /*
 461  * Constants relative to the data blocks
 462  */
 463 #define EXT4_NDIR_BLOCKS                12
 464 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 465 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 466 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 467 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 468
 469 /*
 470  * Inode flags
 471  */
 472 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 473 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 474 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 475 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 476 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 477 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 478 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 479 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 480 /* Reserved for compression usage... */
 481 #define EXT4_DIRTY_FL                   0x00000100
 482 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 483 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 484         /* nb: was previously EXT2_ECOMPR_FL */
 485 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 486 /* End compression flags --- maybe not all used */
 487 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 488 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 489 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 490 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 491 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 492 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 493 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 494 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 495 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 496 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 497 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
 498
 499 #define EXT4_DAX_FL                     0x02000000 /* Inode is DAX */
 500
 501 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 502 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 503 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded directory */
 504 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 505
 506 /* User modifiable flags */
 507 #define EXT4_FL_USER_MODIFIABLE         (EXT4_SECRM_FL | \
 508                                          EXT4_UNRM_FL | \
 509                                          EXT4_COMPR_FL | \
 510                                          EXT4_SYNC_FL | \
 511                                          EXT4_IMMUTABLE_FL | \
 512                                          EXT4_APPEND_FL | \
 513                                          EXT4_NODUMP_FL | \
 514                                          EXT4_NOATIME_FL | \
 515                                          EXT4_JOURNAL_DATA_FL | \
 516                                          EXT4_NOTAIL_FL | \
 517                                          EXT4_DIRSYNC_FL | \
 518                                          EXT4_TOPDIR_FL | \
 519                                          EXT4_EXTENTS_FL | \
 520                                          0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
 521                                          EXT4_DAX_FL | \
 522                                          EXT4_PROJINHERIT_FL | \
 523                                          EXT4_CASEFOLD_FL)
 524
 525 /* User visible flags */
 526 #define EXT4_FL_USER_VISIBLE            (EXT4_FL_USER_MODIFIABLE | \
 527                                          EXT4_DIRTY_FL | \
 528                                          EXT4_COMPRBLK_FL | \
 529                                          EXT4_NOCOMPR_FL | \
 530                                          EXT4_ENCRYPT_FL | \
 531                                          EXT4_INDEX_FL | \
 532                                          EXT4_VERITY_FL | \
 533                                          EXT4_INLINE_DATA_FL)
 534
 535 /* Flags that should be inherited by new inodes from their parent. */
 536 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 537                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 538                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 539                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 540                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
 541                            EXT4_DAX_FL)
 542
 543 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 544 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 545                            EXT4_PROJINHERIT_FL))
 546
 547 /* Flags that are appropriate for non-directories/regular files. */
 548 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 549
 550 /* The only flags that should be swapped */
 551 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 552
 553 /* Flags which are mutually exclusive to DAX */
 554 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
 555                            EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
 556
 557 /* Mask out flags that are inappropriate for the given type of inode. */
 558 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 559 {
 560         if (S_ISDIR(mode))
 561                 return flags;
 562         else if (S_ISREG(mode))
 563                 return flags & EXT4_REG_FLMASK;
 564         else
 565                 return flags & EXT4_OTHER_FLMASK;
 566 }
 567
 568 /*
 569  * Inode flags used for atomic set/get
 570  */
 571 enum {
 572         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 573         EXT4_INODE_UNRM         = 1,    /* Undelete */
 574         EXT4_INODE_COMPR        = 2,    /* Compress file */
 575         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 576         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 577         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 578         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 579         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 580 /* Reserved for compression usage... */
 581         EXT4_INODE_DIRTY        = 8,
 582         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 583         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 584         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 585 /* End compression flags --- maybe not all used */
 586         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 587         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 588         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 589         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 590         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 591         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 592         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 593         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 594         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 595         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 596 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
 597         EXT4_INODE_DAX          = 25,   /* Inode is DAX */
 598         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 599         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 600         EXT4_INODE_CASEFOLD     = 30,   /* Casefolded directory */
 601         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 602 };
 603
 604 /*
 605  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 606  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 607  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 608  * any extra space in the compiled kernel image, otherwise, the build will fail.
 609  * It's important that these values are the same, since we are using
 610  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 611  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 612  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 613  * defined in e2fsprogs.
 614  *
 615  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 616  */
 617 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
 618 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 619
 620 static inline void ext4_check_flag_values(void)
 621 {
 622         CHECK_FLAG_VALUE(SECRM);
 623         CHECK_FLAG_VALUE(UNRM);
 624         CHECK_FLAG_VALUE(COMPR);
 625         CHECK_FLAG_VALUE(SYNC);
 626         CHECK_FLAG_VALUE(IMMUTABLE);
 627         CHECK_FLAG_VALUE(APPEND);
 628         CHECK_FLAG_VALUE(NODUMP);
 629         CHECK_FLAG_VALUE(NOATIME);
 630         CHECK_FLAG_VALUE(DIRTY);
 631         CHECK_FLAG_VALUE(COMPRBLK);
 632         CHECK_FLAG_VALUE(NOCOMPR);
 633         CHECK_FLAG_VALUE(ENCRYPT);
 634         CHECK_FLAG_VALUE(INDEX);
 635         CHECK_FLAG_VALUE(IMAGIC);
 636         CHECK_FLAG_VALUE(JOURNAL_DATA);
 637         CHECK_FLAG_VALUE(NOTAIL);
 638         CHECK_FLAG_VALUE(DIRSYNC);
 639         CHECK_FLAG_VALUE(TOPDIR);
 640         CHECK_FLAG_VALUE(HUGE_FILE);
 641         CHECK_FLAG_VALUE(EXTENTS);
 642         CHECK_FLAG_VALUE(VERITY);
 643         CHECK_FLAG_VALUE(EA_INODE);
 644         CHECK_FLAG_VALUE(INLINE_DATA);
 645         CHECK_FLAG_VALUE(PROJINHERIT);
 646         CHECK_FLAG_VALUE(CASEFOLD);
 647         CHECK_FLAG_VALUE(RESERVED);
 648 }
 649
 650 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 651 struct compat_ext4_new_group_input {
 652         u32 group;
 653         compat_u64 block_bitmap;
 654         compat_u64 inode_bitmap;
 655         compat_u64 inode_table;
 656         u32 blocks_count;
 657         u16 reserved_blocks;
 658         u16 unused;
 659 };
 660 #endif
 661
 662 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 663 struct ext4_new_group_data {
 664         __u32 group;
 665         __u64 block_bitmap;
 666         __u64 inode_bitmap;
 667         __u64 inode_table;
 668         __u32 blocks_count;
 669         __u16 reserved_blocks;
 670         __u16 mdata_blocks;
 671         __u32 free_clusters_count;
 672 };
 673
 674 /* Indexes used to index group tables in ext4_new_group_data */
 675 enum {
 676         BLOCK_BITMAP = 0,       /* block bitmap */
 677         INODE_BITMAP,           /* inode bitmap */
 678         INODE_TABLE,            /* inode tables */
 679         GROUP_TABLE_COUNT,
 680 };
 681
 682 /*
 683  * Flags used by ext4_map_blocks()
 684  */
 685         /* Allocate any needed blocks and/or convert an unwritten
 686            extent to be an initialized ext4 */
 687 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 688         /* Request the creation of an unwritten extent */
 689 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 690 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 691                                                  EXT4_GET_BLOCKS_CREATE)
 692         /* Caller is from the delayed allocation writeout path
 693          * finally doing the actual allocation of delayed blocks */
 694 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 695         /* caller is from the direct IO path, request to creation of an
 696         unwritten extents if not allocated, split the unwritten
 697         extent if blocks has been preallocated already*/
 698 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 699 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 700 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 701                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 702         /* Convert extent to initialized after IO complete */
 703 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 704                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 705         /* Eventual metadata allocation (due to growing extent tree)
 706          * should not fail, so try to use reserved blocks for that.*/
 707 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 708         /* Don't normalize allocation size (used for fallocate) */
 709 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 710         /* Convert written extents to unwritten */
 711 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 712         /* Write zeros to newly created written extents */
 713 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 714 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 715                                         EXT4_GET_BLOCKS_ZERO)
 716         /* Caller will submit data before dropping transaction handle. This
 717          * allows jbd2 to avoid submitting data before commit. */
 718 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 719         /* Caller is in the atomic contex, find extent if it has been cached */
 720 #define EXT4_GET_BLOCKS_CACHED_NOWAIT           0x0800
 721
 722 /*
 723  * The bit position of these flags must not overlap with any of the
 724  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 725  * read_extent_tree_block(), ext4_split_extent_at(),
 726  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 727  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 728  * caching the extents when reading from the extent tree while a
 729  * truncate or punch hole operation is in progress.
 730  */
 731 #define EXT4_EX_NOCACHE                         0x40000000
 732 #define EXT4_EX_FORCE_CACHE                     0x20000000
 733 #define EXT4_EX_NOFAIL                          0x10000000
 734
 735 /*
 736  * Flags used by ext4_free_blocks
 737  */
 738 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 739 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 740 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 741 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 742 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 743 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 744 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 745
 746 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 747 /*
 748  * ioctl commands in 32 bit emulation
 749  */
 750 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 751 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 752 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 753 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 754 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 755 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 756 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 757 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 758 #endif
 759
 760 /* Max physical block we can address w/o extents */
 761 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 762
 763 /* Max logical block we can support */
 764 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFE
 765
 766 /*
 767  * Structure of an inode on the disk
 768  */
 769 struct ext4_inode {
 770         __le16  i_mode;         /* File mode */
 771         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 772         __le32  i_size_lo;      /* Size in bytes */
 773         __le32  i_atime;        /* Access time */
 774         __le32  i_ctime;        /* Inode Change time */
 775         __le32  i_mtime;        /* Modification time */
 776         __le32  i_dtime;        /* Deletion Time */
 777         __le16  i_gid;          /* Low 16 bits of Group Id */
 778         __le16  i_links_count;  /* Links count */
 779         __le32  i_blocks_lo;    /* Blocks count */
 780         __le32  i_flags;        /* File flags */
 781         union {
 782                 struct {
 783                         __le32  l_i_version;
 784                 } linux1;
 785                 struct {
 786                         __u32  h_i_translator;
 787                 } hurd1;
 788                 struct {
 789                         __u32  m_i_reserved1;
 790                 } masix1;
 791         } osd1;                         /* OS dependent 1 */
 792         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 793         __le32  i_generation;   /* File version (for NFS) */
 794         __le32  i_file_acl_lo;  /* File ACL */
 795         __le32  i_size_high;
 796         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 797         union {
 798                 struct {
 799                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 800                         __le16  l_i_file_acl_high;
 801                         __le16  l_i_uid_high;   /* these 2 fields */
 802                         __le16  l_i_gid_high;   /* were reserved2[0] */
 803                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 804                         __le16  l_i_reserved;
 805                 } linux2;
 806                 struct {
 807                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 808                         __u16   h_i_mode_high;
 809                         __u16   h_i_uid_high;
 810                         __u16   h_i_gid_high;
 811                         __u32   h_i_author;
 812                 } hurd2;
 813                 struct {
 814                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 815                         __le16  m_i_file_acl_high;
 816                         __u32   m_i_reserved2[2];
 817                 } masix2;
 818         } osd2;                         /* OS dependent 2 */
 819         __le16  i_extra_isize;
 820         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 821         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 822         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 823         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 824         __le32  i_crtime;       /* File Creation time */
 825         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 826         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 827         __le32  i_projid;       /* Project ID */
 828 };
 829
 830 #define EXT4_EPOCH_BITS 2
 831 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 832 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 833
 834 /*
 835  * Extended fields will fit into an inode if the filesystem was formatted
 836  * with large inodes (-I 256 or larger) and there are not currently any EAs
 837  * consuming all of the available space. For new inodes we always reserve
 838  * enough space for the kernel's known extended fields, but for inodes
 839  * created with an old kernel this might not have been the case. None of
 840  * the extended inode fields is critical for correct filesystem operation.
 841  * This macro checks if a certain field fits in the inode. Note that
 842  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 843  */
 844 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 845         ((offsetof(typeof(*ext4_inode), field) +        \
 846           sizeof((ext4_inode)->field))                  \
 847         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 848             (einode)->i_extra_isize))                   \
 849
 850 /*
 851  * We use an encoding that preserves the times for extra epoch "00":
 852  *
 853  * extra  msb of                         adjust for signed
 854  * epoch  32-bit                         32-bit tv_sec to
 855  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 856  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 857  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 858  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 859  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 860  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 861  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 862  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 863  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 864  *
 865  * Note that previous versions of the kernel on 64-bit systems would
 866  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 867  * 1970.  e2fsck will correct this, assuming that it is run on the
 868  * affected filesystem before 2242.
 869  */
 870
 871 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 872 {
 873         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 874         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 875 }
 876
 877 static inline void ext4_decode_extra_time(struct timespec64 *time,
 878                                           __le32 extra)
 879 {
 880         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
 881                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 882         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 883 }
 884
 885 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 886 do {                                                                            \
 887         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 888                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 889                 (raw_inode)->xtime ## _extra =                                  \
 890                                 ext4_encode_extra_time(&(inode)->xtime);        \
 891                 }                                                               \
 892         else    \
 893                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 894 } while (0)
 895
 896 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 897 do {                                                                           \
 898         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 899                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 900         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 901                 (raw_inode)->xtime ## _extra =                                 \
 902                                 ext4_encode_extra_time(&(einode)->xtime);      \
 903 } while (0)
 904
 905 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 906 do {                                                                            \
 907         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 908         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 909                 ext4_decode_extra_time(&(inode)->xtime,                         \
 910                                        raw_inode->xtime ## _extra);             \
 911                 }                                                               \
 912         else                                                                    \
 913                 (inode)->xtime.tv_nsec = 0;                                     \
 914 } while (0)
 915
 916
 917 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 918 do {                                                                           \
 919         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 920                 (einode)->xtime.tv_sec =                                       \
 921                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 922         else                                                                   \
 923                 (einode)->xtime.tv_sec = 0;                                    \
 924         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 925                 ext4_decode_extra_time(&(einode)->xtime,                       \
 926                                        raw_inode->xtime ## _extra);            \
 927         else                                                                   \
 928                 (einode)->xtime.tv_nsec = 0;                                   \
 929 } while (0)
 930
 931 #define i_disk_version osd1.linux1.l_i_version
 932
 933 #if defined(__KERNEL__) || defined(__linux__)
 934 #define i_reserved1     osd1.linux1.l_i_reserved1
 935 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 936 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 937 #define i_uid_low       i_uid
 938 #define i_gid_low       i_gid
 939 #define i_uid_high      osd2.linux2.l_i_uid_high
 940 #define i_gid_high      osd2.linux2.l_i_gid_high
 941 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 942
 943 #elif defined(__GNU__)
 944
 945 #define i_translator    osd1.hurd1.h_i_translator
 946 #define i_uid_high      osd2.hurd2.h_i_uid_high
 947 #define i_gid_high      osd2.hurd2.h_i_gid_high
 948 #define i_author        osd2.hurd2.h_i_author
 949
 950 #elif defined(__masix__)
 951
 952 #define i_reserved1     osd1.masix1.m_i_reserved1
 953 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 954 #define i_reserved2     osd2.masix2.m_i_reserved2
 955
 956 #endif /* defined(__KERNEL__) || defined(__linux__) */
 957
 958 #include "extents_status.h"
 959 #include "fast_commit.h"
 960
 961 /*
 962  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 963  *
 964  * These are needed to avoid lockdep false positives when we need to
 965  * allocate blocks to the quota inode during ext4_map_blocks(), while
 966  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 967  * do quota tracking for the quota inode, this avoids deadlock (as
 968  * well as infinite recursion, since it isn't turtles all the way
 969  * down...)
 970  *
 971  *  I_DATA_SEM_NORMAL - Used for most inodes
 972  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 973  *                        where the second inode has larger inode number
 974  *                        than the first
 975  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 976  *  I_DATA_SEM_EA     - Used for ea_inodes only
 977  */
 978 enum {
 979         I_DATA_SEM_NORMAL = 0,
 980         I_DATA_SEM_OTHER,
 981         I_DATA_SEM_QUOTA,
 982         I_DATA_SEM_EA
 983 };
 984
 985
 986 /*
 987  * fourth extended file system inode data in memory
 988  */
 989 struct ext4_inode_info {
 990         __le32  i_data[15];     /* unconverted */
 991         __u32   i_dtime;
 992         ext4_fsblk_t    i_file_acl;
 993
 994         /*
 995          * i_block_group is the number of the block group which contains
 996          * this file's inode.  Constant across the lifetime of the inode,
 997          * it is used for making block allocation decisions - we try to
 998          * place a file's data blocks near its inode block, and new inodes
 999          * near to their parent directory's inode.
1000          */
1001         ext4_group_t    i_block_group;
1002         ext4_lblk_t     i_dir_start_lookup;
1003 #if (BITS_PER_LONG < 64)
1004         unsigned long   i_state_flags;          /* Dynamic state flags */
1005 #endif
1006         unsigned long   i_flags;
1007
1008         /*
1009          * Extended attributes can be read independently of the main file
1010          * data. Taking i_rwsem even when reading would cause contention
1011          * between readers of EAs and writers of regular file data, so
1012          * instead we synchronize on xattr_sem when reading or changing
1013          * EAs.
1014          */
1015         struct rw_semaphore xattr_sem;
1016
1017         /*
1018          * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1019          * i_orphan is used.
1020          */
1021         union {
1022                 struct list_head i_orphan;      /* unlinked but open inodes */
1023                 unsigned int i_orphan_idx;      /* Index in orphan file */
1024         };
1025
1026         /* Fast commit related info */
1027
1028         /* For tracking dentry create updates */
1029         struct list_head i_fc_dilist;
1030         struct list_head i_fc_list;     /*
1031                                          * inodes that need fast commit
1032                                          * protected by sbi->s_fc_lock.
1033                                          */
1034
1035         /* Start of lblk range that needs to be committed in this fast commit */
1036         ext4_lblk_t i_fc_lblk_start;
1037
1038         /* End of lblk range that needs to be committed in this fast commit */
1039         ext4_lblk_t i_fc_lblk_len;
1040
1041         /* Number of ongoing updates on this inode */
1042         atomic_t  i_fc_updates;
1043
1044         /* Fast commit wait queue for this inode */
1045         wait_queue_head_t i_fc_wait;
1046
1047         /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1048         struct mutex i_fc_lock;
1049
1050         /*
1051          * i_disksize keeps track of what the inode size is ON DISK, not
1052          * in memory.  During truncate, i_size is set to the new size by
1053          * the VFS prior to calling ext4_truncate(), but the filesystem won't
1054          * set i_disksize to 0 until the truncate is actually under way.
1055          *
1056          * The intent is that i_disksize always represents the blocks which
1057          * are used by this file.  This allows recovery to restart truncate
1058          * on orphans if we crash during truncate.  We actually write i_disksize
1059          * into the on-disk inode when writing inodes out, instead of i_size.
1060          *
1061          * The only time when i_disksize and i_size may be different is when
1062          * a truncate is in progress.  The only things which change i_disksize
1063          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1064          */
1065         loff_t  i_disksize;
1066
1067         /*
1068          * i_data_sem is for serialising ext4_truncate() against
1069          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1070          * data tree are chopped off during truncate. We can't do that in
1071          * ext4 because whenever we perform intermediate commits during
1072          * truncate, the inode and all the metadata blocks *must* be in a
1073          * consistent state which allows truncation of the orphans to restart
1074          * during recovery.  Hence we must fix the get_block-vs-truncate race
1075          * by other means, so we have i_data_sem.
1076          */
1077         struct rw_semaphore i_data_sem;
1078         struct inode vfs_inode;
1079         struct jbd2_inode *jinode;
1080
1081         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1082
1083         /*
1084          * File creation time. Its function is same as that of
1085          * struct timespec64 i_{a,c,m}time in the generic inode.
1086          */
1087         struct timespec64 i_crtime;
1088
1089         /* mballoc */
1090         atomic_t i_prealloc_active;
1091         struct rb_root i_prealloc_node;
1092         rwlock_t i_prealloc_lock;
1093
1094         /* extents status tree */
1095         struct ext4_es_tree i_es_tree;
1096         rwlock_t i_es_lock;
1097         struct list_head i_es_list;
1098         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1099         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1100         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1101                                            extents to shrink. Protected by
1102                                            i_es_lock  */
1103
1104         /* ialloc */
1105         ext4_group_t    i_last_alloc_group;
1106
1107         /* allocation reservation info for delalloc */
1108         /* In case of bigalloc, this refer to clusters rather than blocks */
1109         unsigned int i_reserved_data_blocks;
1110
1111         /* pending cluster reservations for bigalloc file systems */
1112         struct ext4_pending_tree i_pending_tree;
1113
1114         /* on-disk additional length */
1115         __u16 i_extra_isize;
1116
1117         /* Indicate the inline data space. */
1118         u16 i_inline_off;
1119         u16 i_inline_size;
1120
1121 #ifdef CONFIG_QUOTA
1122         /* quota space reservation, managed internally by quota code */
1123         qsize_t i_reserved_quota;
1124 #endif
1125
1126         /* Lock protecting lists below */
1127         spinlock_t i_completed_io_lock;
1128         /*
1129          * Completed IOs that need unwritten extents handling and have
1130          * transaction reserved
1131          */
1132         struct list_head i_rsv_conversion_list;
1133         struct work_struct i_rsv_conversion_work;
1134         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1135
1136         spinlock_t i_block_reservation_lock;
1137
1138         /*
1139          * Transactions that contain inode's metadata needed to complete
1140          * fsync and fdatasync, respectively.
1141          */
1142         tid_t i_sync_tid;
1143         tid_t i_datasync_tid;
1144
1145 #ifdef CONFIG_QUOTA
1146         struct dquot *i_dquot[MAXQUOTAS];
1147 #endif
1148
1149         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1150         __u32 i_csum_seed;
1151
1152         kprojid_t i_projid;
1153 };
1154
1155 /*
1156  * File system states
1157  */
1158 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1159 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1160 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1161 #define EXT4_FC_REPLAY                  0x0020  /* Fast commit replay ongoing */
1162
1163 /*
1164  * Misc. filesystem flags
1165  */
1166 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1167 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1168 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1169
1170 /*
1171  * Mount flags set via mount options or defaults
1172  */
1173 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1174 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1175 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1176 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1177 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1178 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1179 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1180 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1181 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1182 #ifdef CONFIG_FS_DAX
1183 #define EXT4_MOUNT_DAX_ALWAYS           0x00200 /* Direct Access */
1184 #else
1185 #define EXT4_MOUNT_DAX_ALWAYS           0
1186 #endif
1187 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1188 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1189 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1190 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1191 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1192 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1193 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1194 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1195 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1196 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1197 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1198 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1199                                                  * enable enforcement for hidden
1200                                                  * quota files */
1201 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1202                                                   * enforcement for hidden quota
1203                                                   * files */
1204 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1205                                                   * enforcement */
1206 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1207 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1208 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1209 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1210 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1211 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1212 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1213 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1214 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1215 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1216
1217 /*
1218  * Mount flags set either automatically (could not be set by mount option)
1219  * based on per file system feature or property or in special cases such as
1220  * distinguishing between explicit mount option definition and default.
1221  */
1222 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1223                                                       specified delalloc */
1224 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1225                                                       size of blocksize * 8
1226                                                       blocks */
1227 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1228                                                       file systems */
1229 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1230                                                 specified journal checksum */
1231
1232 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1233 #define EXT4_MOUNT2_DAX_NEVER           0x00000020 /* Do not allow Direct Access */
1234 #define EXT4_MOUNT2_DAX_INODE           0x00000040 /* For printing options only */
1235 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN    0x00000080 /* Optimize group
1236                                                     * scanning in mballoc
1237                                                     */
1238
1239 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1240                                                 ~EXT4_MOUNT_##opt
1241 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1242                                                 EXT4_MOUNT_##opt
1243 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1244                                          EXT4_MOUNT_##opt)
1245
1246 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1247                                                 ~EXT4_MOUNT2_##opt
1248 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1249                                                 EXT4_MOUNT2_##opt
1250 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1251                                          EXT4_MOUNT2_##opt)
1252
1253 #define ext4_test_and_set_bit           __test_and_set_bit_le
1254 #define ext4_set_bit                    __set_bit_le
1255 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1256 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1257 #define ext4_clear_bit                  __clear_bit_le
1258 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1259 #define ext4_test_bit                   test_bit_le
1260 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1261 #define ext4_find_next_bit              find_next_bit_le
1262
1263 extern void mb_set_bits(void *bm, int cur, int len);
1264
1265 /*
1266  * Maximal mount counts between two filesystem checks
1267  */
1268 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1269 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1270
1271 /*
1272  * Behaviour when detecting errors
1273  */
1274 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1275 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1276 #define EXT4_ERRORS_PANIC               3       /* Panic */
1277 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1278
1279 /* Metadata checksum algorithm codes */
1280 #define EXT4_CRC32C_CHKSUM              1
1281
1282 #define EXT4_LABEL_MAX                  16
1283
1284 /*
1285  * Structure of the super block
1286  */
1287 struct ext4_super_block {
1288 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1289         __le32  s_blocks_count_lo;      /* Blocks count */
1290         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1291         __le32  s_free_blocks_count_lo; /* Free blocks count */
1292 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1293         __le32  s_first_data_block;     /* First Data Block */
1294         __le32  s_log_block_size;       /* Block size */
1295         __le32  s_log_cluster_size;     /* Allocation cluster size */
1296 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1297         __le32  s_clusters_per_group;   /* # Clusters per group */
1298         __le32  s_inodes_per_group;     /* # Inodes per group */
1299         __le32  s_mtime;                /* Mount time */
1300 /*30*/  __le32  s_wtime;                /* Write time */
1301         __le16  s_mnt_count;            /* Mount count */
1302         __le16  s_max_mnt_count;        /* Maximal mount count */
1303         __le16  s_magic;                /* Magic signature */
1304         __le16  s_state;                /* File system state */
1305         __le16  s_errors;               /* Behaviour when detecting errors */
1306         __le16  s_minor_rev_level;      /* minor revision level */
1307 /*40*/  __le32  s_lastcheck;            /* time of last check */
1308         __le32  s_checkinterval;        /* max. time between checks */
1309         __le32  s_creator_os;           /* OS */
1310         __le32  s_rev_level;            /* Revision level */
1311 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1312         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1313         /*
1314          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1315          *
1316          * Note: the difference between the compatible feature set and
1317          * the incompatible feature set is that if there is a bit set
1318          * in the incompatible feature set that the kernel doesn't
1319          * know about, it should refuse to mount the filesystem.
1320          *
1321          * e2fsck's requirements are more strict; if it doesn't know
1322          * about a feature in either the compatible or incompatible
1323          * feature set, it must abort and not try to meddle with
1324          * things it doesn't understand...
1325          */
1326         __le32  s_first_ino;            /* First non-reserved inode */
1327         __le16  s_inode_size;           /* size of inode structure */
1328         __le16  s_block_group_nr;       /* block group # of this superblock */
1329         __le32  s_feature_compat;       /* compatible feature set */
1330 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1331         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1332 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1333 /*78*/  char    s_volume_name[EXT4_LABEL_MAX];  /* volume name */
1334 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1335 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1336         /*
1337          * Performance hints.  Directory preallocation should only
1338          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1339          */
1340         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1341         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1342         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1343         /*
1344          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1345          */
1346 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1347 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1348         __le32  s_journal_dev;          /* device number of journal file */
1349         __le32  s_last_orphan;          /* start of list of inodes to delete */
1350         __le32  s_hash_seed[4];         /* HTREE hash seed */
1351         __u8    s_def_hash_version;     /* Default hash version to use */
1352         __u8    s_jnl_backup_type;
1353         __le16  s_desc_size;            /* size of group descriptor */
1354 /*100*/ __le32  s_default_mount_opts;
1355         __le32  s_first_meta_bg;        /* First metablock block group */
1356         __le32  s_mkfs_time;            /* When the filesystem was created */
1357         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1358         /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */
1359 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1360         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1361         __le32  s_free_blocks_count_hi; /* Free blocks count */
1362         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1363         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1364         __le32  s_flags;                /* Miscellaneous flags */
1365         __le16  s_raid_stride;          /* RAID stride */
1366         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1367         __le64  s_mmp_block;            /* Block for multi-mount protection */
1368         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1369         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1370         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1371         __u8    s_encryption_level;     /* versioning level for encryption */
1372         __u8    s_reserved_pad;         /* Padding to next 32bits */
1373         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1374         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1375         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1376         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1377                                               snapshot's future use */
1378         __le32  s_snapshot_list;        /* inode number of the head of the
1379                                            on-disk snapshot list */
1380 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1381         __le32  s_error_count;          /* number of fs errors */
1382         __le32  s_first_error_time;     /* first time an error happened */
1383         __le32  s_first_error_ino;      /* inode involved in first error */
1384         __le64  s_first_error_block;    /* block involved of first error */
1385         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1386         __le32  s_first_error_line;     /* line number where error happened */
1387         __le32  s_last_error_time;      /* most recent time of an error */
1388         __le32  s_last_error_ino;       /* inode involved in last error */
1389         __le32  s_last_error_line;      /* line number where error happened */
1390         __le64  s_last_error_block;     /* block involved of last error */
1391         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1392 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1393         __u8    s_mount_opts[64];
1394         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1395         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1396         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1397         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1398         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1399         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1400         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1401         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1402         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1403         __u8    s_wtime_hi;
1404         __u8    s_mtime_hi;
1405         __u8    s_mkfs_time_hi;
1406         __u8    s_lastcheck_hi;
1407         __u8    s_first_error_time_hi;
1408         __u8    s_last_error_time_hi;
1409         __u8    s_first_error_errcode;
1410         __u8    s_last_error_errcode;
1411         __le16  s_encoding;             /* Filename charset encoding */
1412         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1413         __le32  s_orphan_file_inum;     /* Inode for tracking orphan inodes */
1414         __le32  s_reserved[94];         /* Padding to the end of the block */
1415         __le32  s_checksum;             /* crc32c(superblock) */
1416 };
1417
1418 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1419
1420 #ifdef __KERNEL__
1421
1422 /* Number of quota types we support */
1423 #define EXT4_MAXQUOTAS 3
1424
1425 #define EXT4_ENC_UTF8_12_1      1
1426
1427 /* Types of ext4 journal triggers */
1428 enum ext4_journal_trigger_type {
1429         EXT4_JTR_ORPHAN_FILE,
1430         EXT4_JTR_NONE   /* This must be the last entry for indexing to work! */
1431 };
1432
1433 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1434
1435 struct ext4_journal_trigger {
1436         struct jbd2_buffer_trigger_type tr_triggers;
1437         struct super_block *sb;
1438 };
1439
1440 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1441                                 struct jbd2_buffer_trigger_type *trigger)
1442 {
1443         return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1444 }
1445
1446 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1447
1448 /* Structure at the tail of orphan block */
1449 struct ext4_orphan_block_tail {
1450         __le32 ob_magic;
1451         __le32 ob_checksum;
1452 };
1453
1454 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1455 {
1456         return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1457                         sizeof(u32);
1458 }
1459
1460 struct ext4_orphan_block {
1461         atomic_t ob_free_entries;       /* Number of free orphan entries in block */
1462         struct buffer_head *ob_bh;      /* Buffer for orphan block */
1463 };
1464
1465 /*
1466  * Info about orphan file.
1467  */
1468 struct ext4_orphan_info {
1469         int of_blocks;                  /* Number of orphan blocks in a file */
1470         __u32 of_csum_seed;             /* Checksum seed for orphan file */
1471         struct ext4_orphan_block *of_binfo;     /* Array with info about orphan
1472                                                  * file blocks */
1473 };
1474
1475 /*
1476  * fourth extended-fs super-block data in memory
1477  */
1478 struct ext4_sb_info {
1479         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1480         unsigned long s_inodes_per_block;/* Number of inodes per block */
1481         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1482         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1483         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1484         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1485         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1486         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1487         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1488         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1489         unsigned long s_overhead;  /* # of fs overhead clusters */
1490         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1491         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1492         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1493         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1494         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1495         struct buffer_head * __rcu *s_group_desc;
1496         unsigned int s_mount_opt;
1497         unsigned int s_mount_opt2;
1498         unsigned long s_mount_flags;
1499         unsigned int s_def_mount_opt;
1500         unsigned int s_def_mount_opt2;
1501         ext4_fsblk_t s_sb_block;
1502         atomic64_t s_resv_clusters;
1503         kuid_t s_resuid;
1504         kgid_t s_resgid;
1505         unsigned short s_mount_state;
1506         unsigned short s_pad;
1507         int s_addr_per_block_bits;
1508         int s_desc_per_block_bits;
1509         int s_inode_size;
1510         int s_first_ino;
1511         unsigned int s_inode_readahead_blks;
1512         unsigned int s_inode_goal;
1513         u32 s_hash_seed[4];
1514         int s_def_hash_version;
1515         int s_hash_unsigned;    /* 3 if hash should be unsigned, 0 if not */
1516         struct percpu_counter s_freeclusters_counter;
1517         struct percpu_counter s_freeinodes_counter;
1518         struct percpu_counter s_dirs_counter;
1519         struct percpu_counter s_dirtyclusters_counter;
1520         struct percpu_counter s_sra_exceeded_retry_limit;
1521         struct blockgroup_lock *s_blockgroup_lock;
1522         struct proc_dir_entry *s_proc;
1523         struct kobject s_kobj;
1524         struct completion s_kobj_unregister;
1525         struct super_block *s_sb;
1526         struct buffer_head *s_mmp_bh;
1527
1528         /* Journaling */
1529         struct journal_s *s_journal;
1530         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1531         struct mutex s_orphan_lock;     /* Protects on disk list changes */
1532         struct list_head s_orphan;      /* List of orphaned inodes in on disk
1533                                            list */
1534         struct ext4_orphan_info s_orphan_info;
1535         unsigned long s_commit_interval;
1536         u32 s_max_batch_time;
1537         u32 s_min_batch_time;
1538         struct block_device *s_journal_bdev;
1539 #ifdef CONFIG_QUOTA
1540         /* Names of quota files with journalled quota */
1541         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1542         int s_jquota_fmt;                       /* Format of quota to use */
1543 #endif
1544         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1545         struct ext4_system_blocks __rcu *s_system_blks;
1546
1547 #ifdef EXTENTS_STATS
1548         /* ext4 extents stats */
1549         unsigned long s_ext_min;
1550         unsigned long s_ext_max;
1551         unsigned long s_depth_max;
1552         spinlock_t s_ext_stats_lock;
1553         unsigned long s_ext_blocks;
1554         unsigned long s_ext_extents;
1555 #endif
1556
1557         /* for buddy allocator */
1558         struct ext4_group_info ** __rcu *s_group_info;
1559         struct inode *s_buddy_cache;
1560         spinlock_t s_md_lock;
1561         unsigned short *s_mb_offsets;
1562         unsigned int *s_mb_maxs;
1563         unsigned int s_group_info_size;
1564         unsigned int s_mb_free_pending;
1565         struct list_head s_freed_data_list;     /* List of blocks to be freed
1566                                                    after commit completed */
1567         struct list_head s_discard_list;
1568         struct work_struct s_discard_work;
1569         atomic_t s_retry_alloc_pending;
1570         struct list_head *s_mb_avg_fragment_size;
1571         rwlock_t *s_mb_avg_fragment_size_locks;
1572         struct list_head *s_mb_largest_free_orders;
1573         rwlock_t *s_mb_largest_free_orders_locks;
1574
1575         /* tunables */
1576         unsigned long s_stripe;
1577         unsigned int s_mb_max_linear_groups;
1578         unsigned int s_mb_stream_request;
1579         unsigned int s_mb_max_to_scan;
1580         unsigned int s_mb_min_to_scan;
1581         unsigned int s_mb_stats;
1582         unsigned int s_mb_order2_reqs;
1583         unsigned int s_mb_group_prealloc;
1584         unsigned int s_max_dir_size_kb;
1585         /* where last allocation was done - for stream allocation */
1586         unsigned long s_mb_last_group;
1587         unsigned long s_mb_last_start;
1588         unsigned int s_mb_prefetch;
1589         unsigned int s_mb_prefetch_limit;
1590         unsigned int s_mb_best_avail_max_trim_order;
1591
1592         /* stats for buddy allocator */
1593         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1594         atomic_t s_bal_success; /* we found long enough chunks */
1595         atomic_t s_bal_allocated;       /* in blocks */
1596         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1597         atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS];  /* total extents scanned */
1598         atomic_t s_bal_groups_scanned;  /* number of groups scanned */
1599         atomic_t s_bal_goals;   /* goal hits */
1600         atomic_t s_bal_len_goals;       /* len goal hits */
1601         atomic_t s_bal_breaks;  /* too long searches */
1602         atomic_t s_bal_2orders; /* 2^order hits */
1603         atomic_t s_bal_p2_aligned_bad_suggestions;
1604         atomic_t s_bal_goal_fast_bad_suggestions;
1605         atomic_t s_bal_best_avail_bad_suggestions;
1606         atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS];
1607         atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS];
1608         atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS];            /* cX loop didn't find blocks */
1609         atomic_t s_mb_buddies_generated;        /* number of buddies generated */
1610         atomic64_t s_mb_generation_time;
1611         atomic_t s_mb_lost_chunks;
1612         atomic_t s_mb_preallocated;
1613         atomic_t s_mb_discarded;
1614         atomic_t s_lock_busy;
1615
1616         /* locality groups */
1617         struct ext4_locality_group __percpu *s_locality_groups;
1618
1619         /* for write statistics */
1620         unsigned long s_sectors_written_start;
1621         u64 s_kbytes_written;
1622
1623         /* the size of zero-out chunk */
1624         unsigned int s_extent_max_zeroout_kb;
1625
1626         unsigned int s_log_groups_per_flex;
1627         struct flex_groups * __rcu *s_flex_groups;
1628         ext4_group_t s_flex_groups_allocated;
1629
1630         /* workqueue for reserved extent conversions (buffered io) */
1631         struct workqueue_struct *rsv_conversion_wq;
1632
1633         /* timer for periodic error stats printing */
1634         struct timer_list s_err_report;
1635
1636         /* Lazy inode table initialization info */
1637         struct ext4_li_request *s_li_request;
1638         /* Wait multiplier for lazy initialization thread */
1639         unsigned int s_li_wait_mult;
1640
1641         /* Kernel thread for multiple mount protection */
1642         struct task_struct *s_mmp_tsk;
1643
1644         /* record the last minlen when FITRIM is called. */
1645         unsigned long s_last_trim_minblks;
1646
1647         /* Reference to checksum algorithm driver via cryptoapi */
1648         struct crypto_shash *s_chksum_driver;
1649
1650         /* Precomputed FS UUID checksum for seeding other checksums */
1651         __u32 s_csum_seed;
1652
1653         /* Reclaim extents from extent status tree */
1654         struct shrinker s_es_shrinker;
1655         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1656         long s_es_nr_inode;
1657         struct ext4_es_stats s_es_stats;
1658         struct mb_cache *s_ea_block_cache;
1659         struct mb_cache *s_ea_inode_cache;
1660         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1661
1662         /* Journal triggers for checksum computation */
1663         struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1664
1665         /* Ratelimit ext4 messages. */
1666         struct ratelimit_state s_err_ratelimit_state;
1667         struct ratelimit_state s_warning_ratelimit_state;
1668         struct ratelimit_state s_msg_ratelimit_state;
1669         atomic_t s_warning_count;
1670         atomic_t s_msg_count;
1671
1672         /* Encryption policy for '-o test_dummy_encryption' */
1673         struct fscrypt_dummy_policy s_dummy_enc_policy;
1674
1675         /*
1676          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1677          * or EXTENTS flag.
1678          */
1679         struct percpu_rw_semaphore s_writepages_rwsem;
1680         struct dax_device *s_daxdev;
1681         u64 s_dax_part_off;
1682 #ifdef CONFIG_EXT4_DEBUG
1683         unsigned long s_simulate_fail;
1684 #endif
1685         /* Record the errseq of the backing block device */
1686         errseq_t s_bdev_wb_err;
1687         spinlock_t s_bdev_wb_lock;
1688
1689         /* Information about errors that happened during this mount */
1690         spinlock_t s_error_lock;
1691         int s_add_error_count;
1692         int s_first_error_code;
1693         __u32 s_first_error_line;
1694         __u32 s_first_error_ino;
1695         __u64 s_first_error_block;
1696         const char *s_first_error_func;
1697         time64_t s_first_error_time;
1698         int s_last_error_code;
1699         __u32 s_last_error_line;
1700         __u32 s_last_error_ino;
1701         __u64 s_last_error_block;
1702         const char *s_last_error_func;
1703         time64_t s_last_error_time;
1704         /*
1705          * If we are in a context where we cannot update error information in
1706          * the on-disk superblock, we queue this work to do it.
1707          */
1708         struct work_struct s_error_work;
1709
1710         /* Ext4 fast commit sub transaction ID */
1711         atomic_t s_fc_subtid;
1712
1713         /*
1714          * After commit starts, the main queue gets locked, and the further
1715          * updates get added in the staging queue.
1716          */
1717 #define FC_Q_MAIN       0
1718 #define FC_Q_STAGING    1
1719         struct list_head s_fc_q[2];     /* Inodes staged for fast commit
1720                                          * that have data changes in them.
1721                                          */
1722         struct list_head s_fc_dentry_q[2];      /* directory entry updates */
1723         unsigned int s_fc_bytes;
1724         /*
1725          * Main fast commit lock. This lock protects accesses to the
1726          * following fields:
1727          * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1728          */
1729         spinlock_t s_fc_lock;
1730         struct buffer_head *s_fc_bh;
1731         struct ext4_fc_stats s_fc_stats;
1732         tid_t s_fc_ineligible_tid;
1733 #ifdef CONFIG_EXT4_DEBUG
1734         int s_fc_debug_max_replay;
1735 #endif
1736         struct ext4_fc_replay_state s_fc_replay_state;
1737 };
1738
1739 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1740 {
1741         return sb->s_fs_info;
1742 }
1743 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1744 {
1745         return container_of(inode, struct ext4_inode_info, vfs_inode);
1746 }
1747
1748 static inline int ext4_writepages_down_read(struct super_block *sb)
1749 {
1750         percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem);
1751         return memalloc_nofs_save();
1752 }
1753
1754 static inline void ext4_writepages_up_read(struct super_block *sb, int ctx)
1755 {
1756         memalloc_nofs_restore(ctx);
1757         percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem);
1758 }
1759
1760 static inline int ext4_writepages_down_write(struct super_block *sb)
1761 {
1762         percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem);
1763         return memalloc_nofs_save();
1764 }
1765
1766 static inline void ext4_writepages_up_write(struct super_block *sb, int ctx)
1767 {
1768         memalloc_nofs_restore(ctx);
1769         percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem);
1770 }
1771
1772 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1773 {
1774         return ino == EXT4_ROOT_INO ||
1775                 (ino >= EXT4_FIRST_INO(sb) &&
1776                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1777 }
1778
1779 /*
1780  * Returns: sbi->field[index]
1781  * Used to access an array element from the following sbi fields which require
1782  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1783  * - s_group_desc
1784  * - s_group_info
1785  * - s_flex_group
1786  */
1787 #define sbi_array_rcu_deref(sbi, field, index)                             \
1788 ({                                                                         \
1789         typeof(*((sbi)->field)) _v;                                        \
1790         rcu_read_lock();                                                   \
1791         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1792         rcu_read_unlock();                                                 \
1793         _v;                                                                \
1794 })
1795
1796 /*
1797  * run-time mount flags
1798  */
1799 enum {
1800         EXT4_MF_MNTDIR_SAMPLED,
1801         EXT4_MF_FS_ABORTED,     /* Fatal error detected */
1802         EXT4_MF_FC_INELIGIBLE   /* Fast commit ineligible */
1803 };
1804
1805 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1806 {
1807         set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1808 }
1809
1810 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1811 {
1812         clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1813 }
1814
1815 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1816 {
1817         return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1818 }
1819
1820
1821 /*
1822  * Simulate_fail codes
1823  */
1824 #define EXT4_SIM_BBITMAP_EIO    1
1825 #define EXT4_SIM_BBITMAP_CRC    2
1826 #define EXT4_SIM_IBITMAP_EIO    3
1827 #define EXT4_SIM_IBITMAP_CRC    4
1828 #define EXT4_SIM_INODE_EIO      5
1829 #define EXT4_SIM_INODE_CRC      6
1830 #define EXT4_SIM_DIRBLOCK_EIO   7
1831 #define EXT4_SIM_DIRBLOCK_CRC   8
1832
1833 static inline bool ext4_simulate_fail(struct super_block *sb,
1834                                      unsigned long code)
1835 {
1836 #ifdef CONFIG_EXT4_DEBUG
1837         struct ext4_sb_info *sbi = EXT4_SB(sb);
1838
1839         if (unlikely(sbi->s_simulate_fail == code)) {
1840                 sbi->s_simulate_fail = 0;
1841                 return true;
1842         }
1843 #endif
1844         return false;
1845 }
1846
1847 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1848                                          struct buffer_head *bh,
1849                                          unsigned long code)
1850 {
1851         if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1852                 clear_buffer_uptodate(bh);
1853 }
1854
1855 /*
1856  * Error number codes for s_{first,last}_error_errno
1857  *
1858  * Linux errno numbers are architecture specific, so we need to translate
1859  * them into something which is architecture independent.   We don't define
1860  * codes for all errno's; just the ones which are most likely to be the cause
1861  * of an ext4_error() call.
1862  */
1863 #define EXT4_ERR_UNKNOWN         1
1864 #define EXT4_ERR_EIO             2
1865 #define EXT4_ERR_ENOMEM          3
1866 #define EXT4_ERR_EFSBADCRC       4
1867 #define EXT4_ERR_EFSCORRUPTED    5
1868 #define EXT4_ERR_ENOSPC          6
1869 #define EXT4_ERR_ENOKEY          7
1870 #define EXT4_ERR_EROFS           8
1871 #define EXT4_ERR_EFBIG           9
1872 #define EXT4_ERR_EEXIST         10
1873 #define EXT4_ERR_ERANGE         11
1874 #define EXT4_ERR_EOVERFLOW      12
1875 #define EXT4_ERR_EBUSY          13
1876 #define EXT4_ERR_ENOTDIR        14
1877 #define EXT4_ERR_ENOTEMPTY      15
1878 #define EXT4_ERR_ESHUTDOWN      16
1879 #define EXT4_ERR_EFAULT         17
1880
1881 /*
1882  * Inode dynamic state flags
1883  */
1884 enum {
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  * Base length of the ext4 directory entry excluding the name length
2278  */
2279 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2280
2281 struct ext4_dir_entry {
2282         __le32  inode;                  /* Inode number */
2283         __le16  rec_len;                /* Directory entry length */
2284         __le16  name_len;               /* Name length */
2285         char    name[EXT4_NAME_LEN];    /* File name */
2286 };
2287
2288
2289 /*
2290  * Encrypted Casefolded entries require saving the hash on disk. This structure
2291  * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2292  * boundary.
2293  */
2294 struct ext4_dir_entry_hash {
2295         __le32 hash;
2296         __le32 minor_hash;
2297 };
2298
2299 /*
2300  * The new version of the directory entry.  Since EXT4 structures are
2301  * stored in intel byte order, and the name_len field could never be
2302  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2303  * file_type field.
2304  */
2305 struct ext4_dir_entry_2 {
2306         __le32  inode;                  /* Inode number */
2307         __le16  rec_len;                /* Directory entry length */
2308         __u8    name_len;               /* Name length */
2309         __u8    file_type;              /* See file type macros EXT4_FT_* below */
2310         char    name[EXT4_NAME_LEN];    /* File name */
2311 };
2312
2313 /*
2314  * Access the hashes at the end of ext4_dir_entry_2
2315  */
2316 #define EXT4_DIRENT_HASHES(entry) \
2317         ((struct ext4_dir_entry_hash *) \
2318                 (((void *)(entry)) + \
2319                 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2320 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2321 #define EXT4_DIRENT_MINOR_HASH(entry) \
2322                 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2323
2324 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2325 {
2326         return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2327 }
2328
2329 /*
2330  * This is a bogus directory entry at the end of each leaf block that
2331  * records checksums.
2332  */
2333 struct ext4_dir_entry_tail {
2334         __le32  det_reserved_zero1;     /* Pretend to be unused */
2335         __le16  det_rec_len;            /* 12 */
2336         __u8    det_reserved_zero2;     /* Zero name length */
2337         __u8    det_reserved_ft;        /* 0xDE, fake file type */
2338         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
2339 };
2340
2341 #define EXT4_DIRENT_TAIL(block, blocksize) \
2342         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2343                                         ((blocksize) - \
2344                                          sizeof(struct ext4_dir_entry_tail))))
2345
2346 /*
2347  * Ext4 directory file types.  Only the low 3 bits are used.  The
2348  * other bits are reserved for now.
2349  */
2350 #define EXT4_FT_UNKNOWN         0
2351 #define EXT4_FT_REG_FILE        1
2352 #define EXT4_FT_DIR             2
2353 #define EXT4_FT_CHRDEV          3
2354 #define EXT4_FT_BLKDEV          4
2355 #define EXT4_FT_FIFO            5
2356 #define EXT4_FT_SOCK            6
2357 #define EXT4_FT_SYMLINK         7
2358
2359 #define EXT4_FT_MAX             8
2360
2361 #define EXT4_FT_DIR_CSUM        0xDE
2362
2363 /*
2364  * EXT4_DIR_PAD defines the directory entries boundaries
2365  *
2366  * NOTE: It must be a multiple of 4
2367  */
2368 #define EXT4_DIR_PAD                    4
2369 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2370 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2371
2372 /*
2373  * The rec_len is dependent on the type of directory. Directories that are
2374  * casefolded and encrypted need to store the hash as well, so we add room for
2375  * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2376  * pass NULL for dir, as those entries do not use the extra fields.
2377  */
2378 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2379                                                 const struct inode *dir)
2380 {
2381         int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2382
2383         if (dir && ext4_hash_in_dirent(dir))
2384                 rec_len += sizeof(struct ext4_dir_entry_hash);
2385         return (rec_len & ~EXT4_DIR_ROUND);
2386 }
2387
2388 /*
2389  * If we ever get support for fs block sizes > page_size, we'll need
2390  * to remove the #if statements in the next two functions...
2391  */
2392 static inline unsigned int
2393 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2394 {
2395         unsigned len = le16_to_cpu(dlen);
2396
2397 #if (PAGE_SIZE >= 65536)
2398         if (len == EXT4_MAX_REC_LEN || len == 0)
2399                 return blocksize;
2400         return (len & 65532) | ((len & 3) << 16);
2401 #else
2402         return len;
2403 #endif
2404 }
2405
2406 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2407 {
2408         BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2409 #if (PAGE_SIZE >= 65536)
2410         if (len < 65536)
2411                 return cpu_to_le16(len);
2412         if (len == blocksize) {
2413                 if (blocksize == 65536)
2414                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2415                 else
2416                         return cpu_to_le16(0);
2417         }
2418         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2419 #else
2420         return cpu_to_le16(len);
2421 #endif
2422 }
2423
2424 /*
2425  * Hash Tree Directory indexing
2426  * (c) Daniel Phillips, 2001
2427  */
2428
2429 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2430                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2431 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2432                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2433 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2434
2435 /* Legal values for the dx_root hash_version field: */
2436
2437 #define DX_HASH_LEGACY                  0
2438 #define DX_HASH_HALF_MD4                1
2439 #define DX_HASH_TEA                     2
2440 #define DX_HASH_LEGACY_UNSIGNED         3
2441 #define DX_HASH_HALF_MD4_UNSIGNED       4
2442 #define DX_HASH_TEA_UNSIGNED            5
2443 #define DX_HASH_SIPHASH                 6
2444
2445 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2446                               const void *address, unsigned int length)
2447 {
2448         struct {
2449                 struct shash_desc shash;
2450                 char ctx[4];
2451         } desc;
2452
2453         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2454
2455         desc.shash.tfm = sbi->s_chksum_driver;
2456         *(u32 *)desc.ctx = crc;
2457
2458         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2459
2460         return *(u32 *)desc.ctx;
2461 }
2462
2463 #ifdef __KERNEL__
2464
2465 /* hash info structure used by the directory hash */
2466 struct dx_hash_info
2467 {
2468         u32             hash;
2469         u32             minor_hash;
2470         int             hash_version;
2471         u32             *seed;
2472 };
2473
2474
2475 /* 32 and 64 bit signed EOF for dx directories */
2476 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2477 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2478
2479
2480 /*
2481  * Control parameters used by ext4_htree_next_block
2482  */
2483 #define HASH_NB_ALWAYS          1
2484
2485 struct ext4_filename {
2486         const struct qstr *usr_fname;
2487         struct fscrypt_str disk_name;
2488         struct dx_hash_info hinfo;
2489 #ifdef CONFIG_FS_ENCRYPTION
2490         struct fscrypt_str crypto_buf;
2491 #endif
2492 #if IS_ENABLED(CONFIG_UNICODE)
2493         struct fscrypt_str cf_name;
2494 #endif
2495 };
2496
2497 #define fname_name(p) ((p)->disk_name.name)
2498 #define fname_usr_name(p) ((p)->usr_fname->name)
2499 #define fname_len(p)  ((p)->disk_name.len)
2500
2501 /*
2502  * Describe an inode's exact location on disk and in memory
2503  */
2504 struct ext4_iloc
2505 {
2506         struct buffer_head *bh;
2507         unsigned long offset;
2508         ext4_group_t block_group;
2509 };
2510
2511 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2512 {
2513         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2514 }
2515
2516 static inline bool ext4_is_quota_file(struct inode *inode)
2517 {
2518         return IS_NOQUOTA(inode) &&
2519                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2520 }
2521
2522 /*
2523  * This structure is stuffed into the struct file's private_data field
2524  * for directories.  It is where we put information so that we can do
2525  * readdir operations in hash tree order.
2526  */
2527 struct dir_private_info {
2528         struct rb_root  root;
2529         struct rb_node  *curr_node;
2530         struct fname    *extra_fname;
2531         loff_t          last_pos;
2532         __u32           curr_hash;
2533         __u32           curr_minor_hash;
2534         __u32           next_hash;
2535 };
2536
2537 /* calculate the first block number of the group */
2538 static inline ext4_fsblk_t
2539 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2540 {
2541         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2542                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2543 }
2544
2545 /*
2546  * Special error return code only used by dx_probe() and its callers.
2547  */
2548 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2549
2550 /* htree levels for ext4 */
2551 #define EXT4_HTREE_LEVEL_COMPAT 2
2552 #define EXT4_HTREE_LEVEL        3
2553
2554 static inline int ext4_dir_htree_level(struct super_block *sb)
2555 {
2556         return ext4_has_feature_largedir(sb) ?
2557                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2558 }
2559
2560 /*
2561  * Timeout and state flag for lazy initialization inode thread.
2562  */
2563 #define EXT4_DEF_LI_WAIT_MULT                   10
2564 #define EXT4_DEF_LI_MAX_START_DELAY             5
2565 #define EXT4_LAZYINIT_QUIT                      0x0001
2566 #define EXT4_LAZYINIT_RUNNING                   0x0002
2567
2568 /*
2569  * Lazy inode table initialization info
2570  */
2571 struct ext4_lazy_init {
2572         unsigned long           li_state;
2573         struct list_head        li_request_list;
2574         struct mutex            li_list_mtx;
2575 };
2576
2577 enum ext4_li_mode {
2578         EXT4_LI_MODE_PREFETCH_BBITMAP,
2579         EXT4_LI_MODE_ITABLE,
2580 };
2581
2582 struct ext4_li_request {
2583         struct super_block      *lr_super;
2584         enum ext4_li_mode       lr_mode;
2585         ext4_group_t            lr_first_not_zeroed;
2586         ext4_group_t            lr_next_group;
2587         struct list_head        lr_request;
2588         unsigned long           lr_next_sched;
2589         unsigned long           lr_timeout;
2590 };
2591
2592 struct ext4_features {
2593         struct kobject f_kobj;
2594         struct completion f_kobj_unregister;
2595 };
2596
2597 /*
2598  * This structure will be used for multiple mount protection. It will be
2599  * written into the block number saved in the s_mmp_block field in the
2600  * superblock. Programs that check MMP should assume that if
2601  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2602  * to use the filesystem, regardless of how old the timestamp is.
2603  */
2604 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2605 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2606 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2607 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2608
2609 struct mmp_struct {
2610         __le32  mmp_magic;              /* Magic number for MMP */
2611         __le32  mmp_seq;                /* Sequence no. updated periodically */
2612
2613         /*
2614          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2615          * purposes and do not affect the correctness of the algorithm
2616          */
2617         __le64  mmp_time;               /* Time last updated */
2618         char    mmp_nodename[64];       /* Node which last updated MMP block */
2619         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2620
2621         /*
2622          * mmp_check_interval is used to verify if the MMP block has been
2623          * updated on the block device. The value is updated based on the
2624          * maximum time to write the MMP block during an update cycle.
2625          */
2626         __le16  mmp_check_interval;
2627
2628         __le16  mmp_pad1;
2629         __le32  mmp_pad2[226];
2630         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2631 };
2632
2633 /* arguments passed to the mmp thread */
2634 struct mmpd_data {
2635         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2636         struct super_block *sb;  /* super block of the fs */
2637 };
2638
2639 /*
2640  * Check interval multiplier
2641  * The MMP block is written every update interval and initially checked every
2642  * update interval x the multiplier (the value is then adapted based on the
2643  * write latency). The reason is that writes can be delayed under load and we
2644  * don't want readers to incorrectly assume that the filesystem is no longer
2645  * in use.
2646  */
2647 #define EXT4_MMP_CHECK_MULT             2UL
2648
2649 /*
2650  * Minimum interval for MMP checking in seconds.
2651  */
2652 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2653
2654 /*
2655  * Maximum interval for MMP checking in seconds.
2656  */
2657 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2658
2659 /*
2660  * Function prototypes
2661  */
2662
2663 /*
2664  * Ok, these declarations are also in <linux/kernel.h> but none of the
2665  * ext4 source programs needs to include it so they are duplicated here.
2666  */
2667 # define NORET_TYPE     /**/
2668 # define ATTRIB_NORET   __attribute__((noreturn))
2669 # define NORET_AND      noreturn,
2670
2671 /* bitmap.c */
2672 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2673 void ext4_inode_bitmap_csum_set(struct super_block *sb,
2674                                 struct ext4_group_desc *gdp,
2675                                 struct buffer_head *bh, int sz);
2676 int ext4_inode_bitmap_csum_verify(struct super_block *sb,
2677                                   struct ext4_group_desc *gdp,
2678                                   struct buffer_head *bh, int sz);
2679 void ext4_block_bitmap_csum_set(struct super_block *sb,
2680                                 struct ext4_group_desc *gdp,
2681                                 struct buffer_head *bh);
2682 int ext4_block_bitmap_csum_verify(struct super_block *sb,
2683                                   struct ext4_group_desc *gdp,
2684                                   struct buffer_head *bh);
2685
2686 /* balloc.c */
2687 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2688                                          ext4_fsblk_t blocknr,
2689                                          ext4_group_t *blockgrpp,
2690                                          ext4_grpblk_t *offsetp);
2691 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2692                                           ext4_fsblk_t block);
2693
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 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2710                                                    ext4_group_t group);
2711 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2712
2713 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2714                                                 ext4_group_t block_group,
2715                                                 bool ignore_locked);
2716 extern int ext4_wait_block_bitmap(struct super_block *sb,
2717                                   ext4_group_t block_group,
2718                                   struct buffer_head *bh);
2719 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2720                                                   ext4_group_t block_group);
2721 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2722                                               ext4_group_t block_group,
2723                                               struct ext4_group_desc *gdp);
2724 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2725
2726 #if IS_ENABLED(CONFIG_UNICODE)
2727 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2728                                          const struct qstr *iname,
2729                                          struct ext4_filename *fname);
2730 #endif
2731
2732 /* ext4 encryption related stuff goes here crypto.c */
2733 #ifdef CONFIG_FS_ENCRYPTION
2734 extern const struct fscrypt_operations ext4_cryptops;
2735
2736 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2737                               int lookup, struct ext4_filename *fname);
2738
2739 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2740                               struct ext4_filename *fname);
2741
2742 void ext4_fname_free_filename(struct ext4_filename *fname);
2743
2744 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2745
2746 #else /* !CONFIG_FS_ENCRYPTION */
2747 static inline int ext4_fname_setup_filename(struct inode *dir,
2748                                             const struct qstr *iname,
2749                                             int lookup,
2750                                             struct ext4_filename *fname)
2751 {
2752         int err = 0;
2753         fname->usr_fname = iname;
2754         fname->disk_name.name = (unsigned char *) iname->name;
2755         fname->disk_name.len = iname->len;
2756
2757 #if IS_ENABLED(CONFIG_UNICODE)
2758         err = ext4_fname_setup_ci_filename(dir, iname, fname);
2759 #endif
2760
2761         return err;
2762 }
2763
2764 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2765                                             struct dentry *dentry,
2766                                             struct ext4_filename *fname)
2767 {
2768         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2769 }
2770
2771 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2772 {
2773 #if IS_ENABLED(CONFIG_UNICODE)
2774         kfree(fname->cf_name.name);
2775         fname->cf_name.name = NULL;
2776 #endif
2777 }
2778
2779 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2780                                                    void __user *arg)
2781 {
2782         return -EOPNOTSUPP;
2783 }
2784 #endif /* !CONFIG_FS_ENCRYPTION */
2785
2786 /* dir.c */
2787 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2788                                   struct file *,
2789                                   struct ext4_dir_entry_2 *,
2790                                   struct buffer_head *, char *, int,
2791                                   unsigned int);
2792 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2793         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2794                                 (de), (bh), (buf), (size), (offset)))
2795 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2796                                 __u32 minor_hash,
2797                                 struct ext4_dir_entry_2 *dirent,
2798                                 struct fscrypt_str *ent_name);
2799 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2800 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2801                              struct buffer_head *bh,
2802                              void *buf, int buf_size,
2803                              struct ext4_filename *fname,
2804                              struct ext4_dir_entry_2 **dest_de);
2805 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2806                         struct ext4_dir_entry_2 *de,
2807                         int buf_size,
2808                         struct ext4_filename *fname);
2809 static inline void ext4_update_dx_flag(struct inode *inode)
2810 {
2811         if (!ext4_has_feature_dir_index(inode->i_sb) &&
2812             ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2813                 /* ext4_iget() should have caught this... */
2814                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2815                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2816         }
2817 }
2818 static const unsigned char ext4_filetype_table[] = {
2819         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2820 };
2821
2822 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2823 {
2824         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2825                 return DT_UNKNOWN;
2826
2827         return ext4_filetype_table[filetype];
2828 }
2829 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2830                              void *buf, int buf_size);
2831
2832 /* fsync.c */
2833 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2834
2835 /* hash.c */
2836 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2837                           struct dx_hash_info *hinfo);
2838
2839 /* ialloc.c */
2840 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2841 extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *,
2842                                       struct inode *, umode_t,
2843                                       const struct qstr *qstr, __u32 goal,
2844                                       uid_t *owner, __u32 i_flags,
2845                                       int handle_type, unsigned int line_no,
2846                                       int nblocks);
2847
2848 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
2849         __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr),      \
2850                          (goal), (owner), i_flags, 0, 0, 0)
2851 #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \
2852                                     type, nblocks)                  \
2853         __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \
2854                          0, (type), __LINE__, (nblocks))
2855
2856
2857 extern void ext4_free_inode(handle_t *, struct inode *);
2858 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2859 extern unsigned long ext4_count_free_inodes(struct super_block *);
2860 extern unsigned long ext4_count_dirs(struct super_block *);
2861 extern void ext4_check_inodes_bitmap(struct super_block *);
2862 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2863 extern int ext4_init_inode_table(struct super_block *sb,
2864                                  ext4_group_t group, int barrier);
2865 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2866
2867 /* fast_commit.c */
2868 int ext4_fc_info_show(struct seq_file *seq, void *v);
2869 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2870 void ext4_fc_init_inode(struct inode *inode);
2871 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2872                          ext4_lblk_t end);
2873 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2874         struct dentry *dentry);
2875 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2876         struct dentry *dentry);
2877 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2878 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2879 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2880                             struct dentry *dentry);
2881 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2882 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2883 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2884 void ext4_fc_start_update(struct inode *inode);
2885 void ext4_fc_stop_update(struct inode *inode);
2886 void ext4_fc_del(struct inode *inode);
2887 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2888 void ext4_fc_replay_cleanup(struct super_block *sb);
2889 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2890 int __init ext4_fc_init_dentry_cache(void);
2891 void ext4_fc_destroy_dentry_cache(void);
2892 int ext4_fc_record_regions(struct super_block *sb, int ino,
2893                            ext4_lblk_t lblk, ext4_fsblk_t pblk,
2894                            int len, int replay);
2895
2896 /* mballoc.c */
2897 extern const struct seq_operations ext4_mb_seq_groups_ops;
2898 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2899 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2900 extern int ext4_mb_init(struct super_block *);
2901 extern int ext4_mb_release(struct super_block *);
2902 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2903                                 struct ext4_allocation_request *, int *);
2904 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2905 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2906 extern int __init ext4_init_mballoc(void);
2907 extern void ext4_exit_mballoc(void);
2908 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2909                                      ext4_group_t group,
2910                                      unsigned int nr, int *cnt);
2911 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2912                                   unsigned int nr);
2913
2914 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2915                              struct buffer_head *bh, ext4_fsblk_t block,
2916                              unsigned long count, int flags);
2917 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2918                                    ext4_group_t ngroups);
2919 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2920                 ext4_group_t i, struct ext4_group_desc *desc);
2921 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2922                                 ext4_fsblk_t block, unsigned long count);
2923 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2924 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2925 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2926                        int len, int state);
2927
2928 /* inode.c */
2929 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2930                          struct ext4_inode_info *ei);
2931 int ext4_inode_is_fast_symlink(struct inode *inode);
2932 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2933 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2934 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2935                      bool wait, struct buffer_head **bhs);
2936 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2937                              struct buffer_head *bh_result, int create);
2938 int ext4_get_block(struct inode *inode, sector_t iblock,
2939                    struct buffer_head *bh_result, int create);
2940 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2941                            struct buffer_head *bh, int create);
2942 int ext4_walk_page_buffers(handle_t *handle,
2943                            struct inode *inode,
2944                            struct buffer_head *head,
2945                            unsigned from,
2946                            unsigned to,
2947                            int *partial,
2948                            int (*fn)(handle_t *handle, struct inode *inode,
2949                                      struct buffer_head *bh));
2950 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2951                                 struct buffer_head *bh);
2952 #define FALL_BACK_TO_NONDELALLOC 1
2953 #define CONVERT_INLINE_DATA      2
2954
2955 typedef enum {
2956         EXT4_IGET_NORMAL =      0,
2957         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2958         EXT4_IGET_HANDLE =      0x0002, /* Inode # is from a handle */
2959         EXT4_IGET_BAD =         0x0004, /* Allow to iget a bad inode */
2960         EXT4_IGET_EA_INODE =    0x0008  /* Inode should contain an EA value */
2961 } ext4_iget_flags;
2962
2963 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2964                                  ext4_iget_flags flags, const char *function,
2965                                  unsigned int line);
2966
2967 #define ext4_iget(sb, ino, flags) \
2968         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2969
2970 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2971 extern int  ext4_setattr(struct mnt_idmap *, struct dentry *,
2972                          struct iattr *);
2973 extern u32  ext4_dio_alignment(struct inode *inode);
2974 extern int  ext4_getattr(struct mnt_idmap *, const struct path *,
2975                          struct kstat *, u32, unsigned int);
2976 extern void ext4_evict_inode(struct inode *);
2977 extern void ext4_clear_inode(struct inode *);
2978 extern int  ext4_file_getattr(struct mnt_idmap *, const struct path *,
2979                               struct kstat *, u32, unsigned int);
2980 extern int  ext4_sync_inode(handle_t *, struct inode *);
2981 extern void ext4_dirty_inode(struct inode *, int);
2982 extern int ext4_change_inode_journal_flag(struct inode *, int);
2983 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2984 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2985                           struct ext4_iloc *iloc);
2986 extern int ext4_inode_attach_jinode(struct inode *inode);
2987 extern int ext4_can_truncate(struct inode *inode);
2988 extern int ext4_truncate(struct inode *);
2989 extern int ext4_break_layouts(struct inode *);
2990 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2991 extern void ext4_set_inode_flags(struct inode *, bool init);
2992 extern int ext4_alloc_da_blocks(struct inode *inode);
2993 extern void ext4_set_aops(struct inode *inode);
2994 extern int ext4_writepage_trans_blocks(struct inode *);
2995 extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode);
2996 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2997 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2998                              loff_t lstart, loff_t lend);
2999 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3000 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3001 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3002 extern void ext4_da_release_space(struct inode *inode, int to_free);
3003 extern void ext4_da_update_reserve_space(struct inode *inode,
3004                                         int used, int quota_claim);
3005 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3006                               ext4_fsblk_t pblk, ext4_lblk_t len);
3007
3008 /* indirect.c */
3009 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3010                                 struct ext4_map_blocks *map, int flags);
3011 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3012 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3013 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3014                                  ext4_lblk_t start, ext4_lblk_t end);
3015
3016 /* ioctl.c */
3017 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3018 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3019 int ext4_fileattr_set(struct mnt_idmap *idmap,
3020                       struct dentry *dentry, struct fileattr *fa);
3021 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3022 extern void ext4_reset_inode_seed(struct inode *inode);
3023 int ext4_update_overhead(struct super_block *sb, bool force);
3024 int ext4_force_shutdown(struct super_block *sb, u32 flags);
3025
3026 /* migrate.c */
3027 extern int ext4_ext_migrate(struct inode *);
3028 extern int ext4_ind_migrate(struct inode *inode);
3029
3030 /* namei.c */
3031 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3032                              struct inode *inode);
3033 extern int ext4_dirblock_csum_verify(struct inode *inode,
3034                                      struct buffer_head *bh);
3035 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3036                                 __u32 start_minor_hash, __u32 *next_hash);
3037 extern int ext4_search_dir(struct buffer_head *bh,
3038                            char *search_buf,
3039                            int buf_size,
3040                            struct inode *dir,
3041                            struct ext4_filename *fname,
3042                            unsigned int offset,
3043                            struct ext4_dir_entry_2 **res_dir);
3044 extern int ext4_generic_delete_entry(struct inode *dir,
3045                                      struct ext4_dir_entry_2 *de_del,
3046                                      struct buffer_head *bh,
3047                                      void *entry_buf,
3048                                      int buf_size,
3049                                      int csum_size);
3050 extern bool ext4_empty_dir(struct inode *inode);
3051
3052 /* resize.c */
3053 extern void ext4_kvfree_array_rcu(void *to_free);
3054 extern int ext4_group_add(struct super_block *sb,
3055                                 struct ext4_new_group_data *input);
3056 extern int ext4_group_extend(struct super_block *sb,
3057                                 struct ext4_super_block *es,
3058                                 ext4_fsblk_t n_blocks_count);
3059 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3060 extern unsigned int ext4_list_backups(struct super_block *sb,
3061                                       unsigned int *three, unsigned int *five,
3062                                       unsigned int *seven);
3063
3064 /* super.c */
3065 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3066                                          sector_t block, blk_opf_t op_flags);
3067 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3068                                                    sector_t block);
3069 extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
3070                                 bh_end_io_t *end_io);
3071 extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
3072                         bh_end_io_t *end_io);
3073 extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
3074 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3075 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3076 extern int ext4_calculate_overhead(struct super_block *sb);
3077 extern __le32 ext4_superblock_csum(struct super_block *sb,
3078                                    struct ext4_super_block *es);
3079 extern void ext4_superblock_csum_set(struct super_block *sb);
3080 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3081                                     ext4_group_t ngroup);
3082 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3083                                      char nbuf[16]);
3084 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3085                                              ext4_group_t block_group,
3086                                              unsigned int flags);
3087
3088 extern __printf(7, 8)
3089 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3090                   int, __u64, const char *, ...);
3091 extern __printf(6, 7)
3092 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3093                         ext4_fsblk_t, int, const char *, ...);
3094 extern __printf(5, 6)
3095 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3096                      const char *, ...);
3097 extern void __ext4_std_error(struct super_block *, const char *,
3098                              unsigned int, int);
3099 extern __printf(4, 5)
3100 void __ext4_warning(struct super_block *, const char *, unsigned int,
3101                     const char *, ...);
3102 extern __printf(4, 5)
3103 void __ext4_warning_inode(const struct inode *inode, const char *function,
3104                           unsigned int line, const char *fmt, ...);
3105 extern __printf(3, 4)
3106 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3107 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3108                            const char *, unsigned int, const char *);
3109 extern __printf(7, 8)
3110 void __ext4_grp_locked_error(const char *, unsigned int,
3111                              struct super_block *, ext4_group_t,
3112                              unsigned long, ext4_fsblk_t,
3113                              const char *, ...);
3114
3115 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3116         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3117
3118 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)                     \
3119         __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3120
3121 #define ext4_error_inode_block(inode, block, err, fmt, a...)            \
3122         __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3123                            (fmt), ## a)
3124
3125 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
3126         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3127
3128 #define ext4_abort(sb, err, fmt, a...)                                  \
3129         __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3130
3131 #ifdef CONFIG_PRINTK
3132
3133 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3134         __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3135 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3136         __ext4_error_inode((inode), (func), (line), (block),            \
3137                            (err), (fmt), ##__VA_ARGS__)
3138 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3139         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3140 #define ext4_error(sb, fmt, ...)                                        \
3141         __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),      \
3142                 ##__VA_ARGS__)
3143 #define ext4_error_err(sb, err, fmt, ...)                               \
3144         __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),  \
3145                 ##__VA_ARGS__)
3146 #define ext4_warning(sb, fmt, ...)                                      \
3147         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3148 #define ext4_warning_inode(inode, fmt, ...)                             \
3149         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3150 #define ext4_msg(sb, level, fmt, ...)                           \
3151         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3152 #define dump_mmp_msg(sb, mmp, msg)                                      \
3153         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3154 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3155         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3156                                 fmt, ##__VA_ARGS__)
3157
3158 #else
3159
3160 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3161 do {                                                                    \
3162         no_printk(fmt, ##__VA_ARGS__);                                  \
3163         __ext4_error_inode(inode, "", 0, block, 0, " ");                \
3164 } while (0)
3165 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3166 do {                                                                    \
3167         no_printk(fmt, ##__VA_ARGS__);                                  \
3168         __ext4_error_inode(inode, "", 0, block, err, " ");              \
3169 } while (0)
3170 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3171 do {                                                                    \
3172         no_printk(fmt, ##__VA_ARGS__);                                  \
3173         __ext4_error_file(file, "", 0, block, " ");                     \
3174 } while (0)
3175 #define ext4_error(sb, fmt, ...)                                        \
3176 do {                                                                    \
3177         no_printk(fmt, ##__VA_ARGS__);                                  \
3178         __ext4_error(sb, "", 0, false, 0, 0, " ");                      \
3179 } while (0)
3180 #define ext4_error_err(sb, err, fmt, ...)                               \
3181 do {                                                                    \
3182         no_printk(fmt, ##__VA_ARGS__);                                  \
3183         __ext4_error(sb, "", 0, false, err, 0, " ");                    \
3184 } while (0)
3185 #define ext4_warning(sb, fmt, ...)                                      \
3186 do {                                                                    \
3187         no_printk(fmt, ##__VA_ARGS__);                                  \
3188         __ext4_warning(sb, "", 0, " ");                                 \
3189 } while (0)
3190 #define ext4_warning_inode(inode, fmt, ...)                             \
3191 do {                                                                    \
3192         no_printk(fmt, ##__VA_ARGS__);                                  \
3193         __ext4_warning_inode(inode, "", 0, " ");                        \
3194 } while (0)
3195 #define ext4_msg(sb, level, fmt, ...)                                   \
3196 do {                                                                    \
3197         no_printk(fmt, ##__VA_ARGS__);                                  \
3198         __ext4_msg(sb, "", " ");                                        \
3199 } while (0)
3200 #define dump_mmp_msg(sb, mmp, msg)                                      \
3201         __dump_mmp_msg(sb, mmp, "", 0, "")
3202 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3203 do {                                                                    \
3204         no_printk(fmt, ##__VA_ARGS__);                          \
3205         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
3206 } while (0)
3207
3208 #endif
3209
3210 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3211                                       struct ext4_group_desc *bg);
3212 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3213                                       struct ext4_group_desc *bg);
3214 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3215                                      struct ext4_group_desc *bg);
3216 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3217                                       struct ext4_group_desc *bg);
3218 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3219                                  struct ext4_group_desc *bg);
3220 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3221                                 struct ext4_group_desc *bg);
3222 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3223                                    struct ext4_group_desc *bg);
3224 extern void ext4_block_bitmap_set(struct super_block *sb,
3225                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3226 extern void ext4_inode_bitmap_set(struct super_block *sb,
3227                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3228 extern void ext4_inode_table_set(struct super_block *sb,
3229                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3230 extern void ext4_free_group_clusters_set(struct super_block *sb,
3231                                          struct ext4_group_desc *bg,
3232                                          __u32 count);
3233 extern void ext4_free_inodes_set(struct super_block *sb,
3234                                 struct ext4_group_desc *bg, __u32 count);
3235 extern void ext4_used_dirs_set(struct super_block *sb,
3236                                 struct ext4_group_desc *bg, __u32 count);
3237 extern void ext4_itable_unused_set(struct super_block *sb,
3238                                    struct ext4_group_desc *bg, __u32 count);
3239 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3240                                        struct ext4_group_desc *gdp);
3241 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3242                                      struct ext4_group_desc *gdp);
3243 extern int ext4_register_li_request(struct super_block *sb,
3244                                     ext4_group_t first_not_zeroed);
3245
3246 static inline int ext4_has_metadata_csum(struct super_block *sb)
3247 {
3248         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3249                      !EXT4_SB(sb)->s_chksum_driver);
3250
3251         return ext4_has_feature_metadata_csum(sb) &&
3252                (EXT4_SB(sb)->s_chksum_driver != NULL);
3253 }
3254
3255 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3256 {
3257         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3258 }
3259
3260 #define ext4_read_incompat_64bit_val(es, name) \
3261         (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3262                 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3263                 le32_to_cpu(es->name##_lo))
3264
3265 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3266 {
3267         return ext4_read_incompat_64bit_val(es, s_blocks_count);
3268 }
3269
3270 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3271 {
3272         return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3273 }
3274
3275 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3276 {
3277         return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3278 }
3279
3280 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3281                                          ext4_fsblk_t blk)
3282 {
3283         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3284         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3285 }
3286
3287 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3288                                               ext4_fsblk_t blk)
3289 {
3290         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3291         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3292 }
3293
3294 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3295                                            ext4_fsblk_t blk)
3296 {
3297         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3298         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3299 }
3300
3301 static inline loff_t ext4_isize(struct super_block *sb,
3302                                 struct ext4_inode *raw_inode)
3303 {
3304         if (ext4_has_feature_largedir(sb) ||
3305             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3306                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3307                         le32_to_cpu(raw_inode->i_size_lo);
3308
3309         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3310 }
3311
3312 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3313 {
3314         raw_inode->i_size_lo = cpu_to_le32(i_size);
3315         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3316 }
3317
3318 /*
3319  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3320  * the locking protocol documented in the comments of ext4_group_add()
3321  * in resize.c
3322  */
3323 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3324 {
3325         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
3326
3327         smp_rmb();
3328         return ngroups;
3329 }
3330
3331 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3332                                              ext4_group_t block_group)
3333 {
3334         return block_group >> sbi->s_log_groups_per_flex;
3335 }
3336
3337 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3338 {
3339         return 1 << sbi->s_log_groups_per_flex;
3340 }
3341
3342 #define ext4_std_error(sb, errno)                               \
3343 do {                                                            \
3344         if ((errno))                                            \
3345                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
3346 } while (0)
3347
3348 #ifdef CONFIG_SMP
3349 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3350  * counters. So we need to make sure we have free clusters more
3351  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3352  */
3353 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3354 #else
3355 #define EXT4_FREECLUSTERS_WATERMARK 0
3356 #endif
3357
3358 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
3359 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3360 {
3361         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3362                      !inode_is_locked(inode));
3363         down_write(&EXT4_I(inode)->i_data_sem);
3364         if (newsize > EXT4_I(inode)->i_disksize)
3365                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3366         up_write(&EXT4_I(inode)->i_data_sem);
3367 }
3368
3369 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
3370 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3371 {
3372         int changed = 0;
3373
3374         if (newsize > inode->i_size) {
3375                 i_size_write(inode, newsize);
3376                 changed = 1;
3377         }
3378         if (newsize > EXT4_I(inode)->i_disksize) {
3379                 ext4_update_i_disksize(inode, newsize);
3380                 changed |= 2;
3381         }
3382         return changed;
3383 }
3384
3385 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3386                                       loff_t len);
3387
3388 struct ext4_group_info {
3389         unsigned long   bb_state;
3390 #ifdef AGGRESSIVE_CHECK
3391         unsigned long   bb_check_counter;
3392 #endif
3393         struct rb_root  bb_free_root;
3394         ext4_grpblk_t   bb_first_free;  /* first free block */
3395         ext4_grpblk_t   bb_free;        /* total free blocks */
3396         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
3397         int             bb_avg_fragment_size_order;     /* order of average
3398                                                            fragment in BG */
3399         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
3400         ext4_group_t    bb_group;       /* Group number */
3401         struct          list_head bb_prealloc_list;
3402 #ifdef DOUBLE_CHECK
3403         void            *bb_bitmap;
3404 #endif
3405         struct rw_semaphore alloc_sem;
3406         struct list_head bb_avg_fragment_size_node;
3407         struct list_head bb_largest_free_order_node;
3408         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3409                                          * regions, index is order.
3410                                          * bb_counters[3] = 5 means
3411                                          * 5 free 8-block regions. */
3412 };
3413
3414 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3415 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3416 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3417 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3418 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3419         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3420 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3421         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3422 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT        4
3423
3424 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3425         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3426 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3427         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3428 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3429         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3430
3431 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3432         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3433 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3434         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3435 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3436         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3437 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)      \
3438         (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3439
3440 #define EXT4_MAX_CONTENTION             8
3441 #define EXT4_CONTENTION_THRESHOLD       2
3442
3443 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3444                                               ext4_group_t group)
3445 {
3446         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3447 }
3448
3449 /*
3450  * Returns true if the filesystem is busy enough that attempts to
3451  * access the block group locks has run into contention.
3452  */
3453 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3454 {
3455         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3456 }
3457
3458 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3459 {
3460         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3461         if (spin_trylock(lock))
3462                 /*
3463                  * We're able to grab the lock right away, so drop the
3464                  * lock contention counter.
3465                  */
3466                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3467         else {
3468                 /*
3469                  * The lock is busy, so bump the contention counter,
3470                  * and then wait on the spin lock.
3471                  */
3472                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3473                                   EXT4_MAX_CONTENTION);
3474                 spin_lock(lock);
3475         }
3476 }
3477
3478 static inline void ext4_unlock_group(struct super_block *sb,
3479                                         ext4_group_t group)
3480 {
3481         spin_unlock(ext4_group_lock_ptr(sb, group));
3482 }
3483
3484 #ifdef CONFIG_QUOTA
3485 static inline bool ext4_quota_capable(struct super_block *sb)
3486 {
3487         return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3488 }
3489
3490 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3491 {
3492         struct ext4_sb_info *sbi = EXT4_SB(sb);
3493
3494         return (ext4_has_feature_quota(sb) ||
3495                 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3496 }
3497 int ext4_enable_quotas(struct super_block *sb);
3498 #endif
3499
3500 /*
3501  * Block validity checking
3502  */
3503 #define ext4_check_indirect_blockref(inode, bh)                         \
3504         ext4_check_blockref(__func__, __LINE__, inode,                  \
3505                             (__le32 *)(bh)->b_data,                     \
3506                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3507
3508 #define ext4_ind_check_inode(inode)                                     \
3509         ext4_check_blockref(__func__, __LINE__, inode,                  \
3510                             EXT4_I(inode)->i_data,                      \
3511                             EXT4_NDIR_BLOCKS)
3512
3513 /*
3514  * Inodes and files operations
3515  */
3516
3517 /* dir.c */
3518 extern const struct file_operations ext4_dir_operations;
3519
3520 /* file.c */
3521 extern const struct inode_operations ext4_file_inode_operations;
3522 extern const struct file_operations ext4_file_operations;
3523 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3524
3525 /* inline.c */
3526 extern int ext4_get_max_inline_size(struct inode *inode);
3527 extern int ext4_find_inline_data_nolock(struct inode *inode);
3528 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3529                                  unsigned int len);
3530 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3531
3532 int ext4_readpage_inline(struct inode *inode, struct folio *folio);
3533 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3534                                          struct inode *inode,
3535                                          loff_t pos, unsigned len,
3536                                          struct page **pagep);
3537 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
3538                                unsigned copied, struct folio *folio);
3539 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3540                                            struct inode *inode,
3541                                            loff_t pos, unsigned len,
3542                                            struct page **pagep,
3543                                            void **fsdata);
3544 extern int ext4_try_add_inline_entry(handle_t *handle,
3545                                      struct ext4_filename *fname,
3546                                      struct inode *dir, struct inode *inode);
3547 extern int ext4_try_create_inline_dir(handle_t *handle,
3548                                       struct inode *parent,
3549                                       struct inode *inode);
3550 extern int ext4_read_inline_dir(struct file *filp,
3551                                 struct dir_context *ctx,
3552                                 int *has_inline_data);
3553 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3554                                   struct inode *dir, ext4_lblk_t block,
3555                                   struct dx_hash_info *hinfo,
3556                                   __u32 start_hash, __u32 start_minor_hash,
3557                                   int *has_inline_data);
3558 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3559                                         struct ext4_filename *fname,
3560                                         struct ext4_dir_entry_2 **res_dir,
3561                                         int *has_inline_data);
3562 extern int ext4_delete_inline_entry(handle_t *handle,
3563                                     struct inode *dir,
3564                                     struct ext4_dir_entry_2 *de_del,
3565                                     struct buffer_head *bh,
3566                                     int *has_inline_data);
3567 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3568 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3569                                         struct ext4_dir_entry_2 **parent_de,
3570                                         int *retval);
3571 extern void *ext4_read_inline_link(struct inode *inode);
3572
3573 struct iomap;
3574 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3575
3576 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3577
3578 extern int ext4_convert_inline_data(struct inode *inode);
3579
3580 static inline int ext4_has_inline_data(struct inode *inode)
3581 {
3582         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3583                EXT4_I(inode)->i_inline_off;
3584 }
3585
3586 /* namei.c */
3587 extern const struct inode_operations ext4_dir_inode_operations;
3588 extern const struct inode_operations ext4_special_inode_operations;
3589 extern struct dentry *ext4_get_parent(struct dentry *child);
3590 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3591                                  struct ext4_dir_entry_2 *de,
3592                                  int blocksize, int csum_size,
3593                                  unsigned int parent_ino, int dotdot_real_len);
3594 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3595                                         unsigned int blocksize);
3596 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3597                                       struct buffer_head *bh);
3598 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3599                          struct inode *inode, struct dentry *dentry);
3600 extern int __ext4_link(struct inode *dir, struct inode *inode,
3601                        struct dentry *dentry);
3602
3603 #define S_SHIFT 12
3604 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3605         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3606         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3607         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3608         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3609         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3610         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3611         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3612 };
3613
3614 static inline void ext4_set_de_type(struct super_block *sb,
3615                                 struct ext4_dir_entry_2 *de,
3616                                 umode_t mode) {
3617         if (ext4_has_feature_filetype(sb))
3618                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3619 }
3620
3621 /* readpages.c */
3622 extern int ext4_mpage_readpages(struct inode *inode,
3623                 struct readahead_control *rac, struct folio *folio);
3624 extern int __init ext4_init_post_read_processing(void);
3625 extern void ext4_exit_post_read_processing(void);
3626
3627 /* symlink.c */
3628 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3629 extern const struct inode_operations ext4_symlink_inode_operations;
3630 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3631
3632 /* sysfs.c */
3633 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3634 extern int ext4_register_sysfs(struct super_block *sb);
3635 extern void ext4_unregister_sysfs(struct super_block *sb);
3636 extern int __init ext4_init_sysfs(void);
3637 extern void ext4_exit_sysfs(void);
3638
3639 /* block_validity */
3640 extern void ext4_release_system_zone(struct super_block *sb);
3641 extern int ext4_setup_system_zone(struct super_block *sb);
3642 extern int __init ext4_init_system_zone(void);
3643 extern void ext4_exit_system_zone(void);
3644 extern int ext4_inode_block_valid(struct inode *inode,
3645                                   ext4_fsblk_t start_blk,
3646                                   unsigned int count);
3647 extern int ext4_check_blockref(const char *, unsigned int,
3648                                struct inode *, __le32 *, unsigned int);
3649 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3650                                 ext4_fsblk_t start_blk, unsigned int count);
3651
3652
3653 /* extents.c */
3654 struct ext4_ext_path;
3655 struct ext4_extent;
3656
3657 /*
3658  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3659  * __le32.
3660  */
3661 #define EXT_MAX_BLOCKS  0xffffffff
3662
3663 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3664 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3665 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3666                                struct ext4_map_blocks *map, int flags);
3667 extern int ext4_ext_truncate(handle_t *, struct inode *);
3668 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3669                                  ext4_lblk_t end);
3670 extern void ext4_ext_init(struct super_block *);
3671 extern void ext4_ext_release(struct super_block *);
3672 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3673                           loff_t len);
3674 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3675                                           loff_t offset, ssize_t len);
3676 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3677                                              ext4_io_end_t *io_end);
3678 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3679                            struct ext4_map_blocks *map, int flags);
3680 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3681                                                    int num,
3682                                                    struct ext4_ext_path *path);
3683 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3684                                   struct ext4_ext_path **,
3685                                   struct ext4_extent *, int);
3686 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3687                                               struct ext4_ext_path **,
3688                                               int flags);
3689 extern void ext4_free_ext_path(struct ext4_ext_path *);
3690 extern int ext4_ext_check_inode(struct inode *inode);
3691 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3692 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3693                         __u64 start, __u64 len);
3694 extern int ext4_get_es_cache(struct inode *inode,
3695                              struct fiemap_extent_info *fieinfo,
3696                              __u64 start, __u64 len);
3697 extern int ext4_ext_precache(struct inode *inode);
3698 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3699                                 struct inode *inode2, ext4_lblk_t lblk1,
3700                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3701                              int mark_unwritten,int *err);
3702 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3703 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3704                                        int check_cred, int restart_cred,
3705                                        int revoke_cred);
3706 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3707 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3708 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3709                 int len, int unwritten, ext4_fsblk_t pblk);
3710 extern int ext4_ext_clear_bb(struct inode *inode);
3711
3712
3713 /* move_extent.c */
3714 extern void ext4_double_down_write_data_sem(struct inode *first,
3715                                             struct inode *second);
3716 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3717                                           struct inode *donor_inode);
3718 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3719                              __u64 start_orig, __u64 start_donor,
3720                              __u64 len, __u64 *moved_len);
3721
3722 /* page-io.c */
3723 extern int __init ext4_init_pageio(void);
3724 extern void ext4_exit_pageio(void);
3725 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3726 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3727 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3728 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3729 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3730                                 struct writeback_control *wbc);
3731 extern void ext4_end_io_rsv_work(struct work_struct *work);
3732 extern void ext4_io_submit(struct ext4_io_submit *io);
3733 int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page,
3734                 size_t len);
3735 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3736 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3737
3738 /* mmp.c */
3739 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3740
3741 /* mmp.c */
3742 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3743
3744 /* verity.c */
3745 extern const struct fsverity_operations ext4_verityops;
3746
3747 /* orphan.c */
3748 extern int ext4_orphan_add(handle_t *, struct inode *);
3749 extern int ext4_orphan_del(handle_t *, struct inode *);
3750 extern void ext4_orphan_cleanup(struct super_block *sb,
3751                                 struct ext4_super_block *es);
3752 extern void ext4_release_orphan_info(struct super_block *sb);
3753 extern int ext4_init_orphan_info(struct super_block *sb);
3754 extern int ext4_orphan_file_empty(struct super_block *sb);
3755 extern void ext4_orphan_file_block_trigger(
3756                                 struct jbd2_buffer_trigger_type *triggers,
3757                                 struct buffer_head *bh,
3758                                 void *data, size_t size);
3759
3760 /*
3761  * Add new method to test whether block and inode bitmaps are properly
3762  * initialized. With uninit_bg reading the block from disk is not enough
3763  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3764  */
3765 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3766
3767 static inline int bitmap_uptodate(struct buffer_head *bh)
3768 {
3769         return (buffer_uptodate(bh) &&
3770                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3771 }
3772 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3773 {
3774         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3775 }
3776
3777 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3778
3779 /* For ioend & aio unwritten conversion wait queues */
3780 #define EXT4_WQ_HASH_SZ         37
3781 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3782                                             EXT4_WQ_HASH_SZ])
3783 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3784
3785 extern int ext4_resize_begin(struct super_block *sb);
3786 extern int ext4_resize_end(struct super_block *sb, bool update_backups);
3787
3788 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3789                                               struct ext4_io_end *io_end)
3790 {
3791         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3792                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3793                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3794         }
3795 }
3796
3797 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3798 {
3799         struct inode *inode = io_end->inode;
3800
3801         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3802                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3803                 /* Wake up anyone waiting on unwritten extent conversion */
3804                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3805                         wake_up_all(ext4_ioend_wq(inode));
3806         }
3807 }
3808
3809 extern const struct iomap_ops ext4_iomap_ops;
3810 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3811 extern const struct iomap_ops ext4_iomap_report_ops;
3812
3813 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3814 {
3815         /*
3816          * If the buffer has the write error flag, we have failed
3817          * to write out data in the block.  In this  case, we don't
3818          * have to read the block because we may read the old data
3819          * successfully.
3820          */
3821         if (buffer_write_io_error(bh))
3822                 set_buffer_uptodate(bh);
3823         return buffer_uptodate(bh);
3824 }
3825
3826 #endif  /* __KERNEL__ */
3827
3828 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3829 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3830
3831 #endif  /* _EXT4_H */