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 ([email protected])
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT4_H
  18 #define _EXT4_H
  19
  20 #include <linux/types.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/magic.h>
  23 #include <linux/jbd2.h>
  24 #include <linux/quota.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/rbtree.h>
  27 #include <linux/seqlock.h>
  28 #include <linux/mutex.h>
  29 #include <linux/timer.h>
  30 #include <linux/wait.h>
  31 #include <linux/sched/signal.h>
  32 #include <linux/blockgroup_lock.h>
  33 #include <linux/percpu_counter.h>
  34 #include <linux/ratelimit.h>
  35 #include <crypto/hash.h>
  36 #include <linux/falloc.h>
  37 #include <linux/percpu-rwsem.h>
  38 #include <linux/fiemap.h>
  39 #ifdef __KERNEL__
  40 #include <linux/compat.h>
  41 #endif
  42
  43 #include <linux/fscrypt.h>
  44 #include <linux/fsverity.h>
  45
  46 #include <linux/compiler.h>
  47
  48 /*
  49  * The fourth extended filesystem constants/structures
  50  */
  51
  52 /*
  53  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  54  * structures. these checks slow things down a lot
  55  */
  56 #define AGGRESSIVE_CHECK__
  57
  58 /*
  59  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  60  * bitmaps, maintains and uses them to check for double allocations
  61  */
  62 #define DOUBLE_CHECK__
  63
  64 /*
  65  * Define EXT4FS_DEBUG to produce debug messages
  66  */
  67 #undef EXT4FS_DEBUG
  68
  69 /*
  70  * Debug code
  71  */
  72 #ifdef EXT4FS_DEBUG
  73 #define ext4_debug(f, a...)                                             \
  74         do {                                                            \
  75                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  76                         __FILE__, __LINE__, __func__);                  \
  77                 printk(KERN_DEBUG f, ## a);                             \
  78         } while (0)
  79 #else
  80 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  81 #endif
  82
  83  /*
  84   * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
  85   */
  86 #define EXT_DEBUG__
  87
  88 /*
  89  * Dynamic printk for controlled extents debugging.
  90  */
  91 #ifdef CONFIG_EXT4_DEBUG
  92 #define ext_debug(ino, fmt, ...)                                        \
  93         pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt,    \
  94                  current->comm, task_pid_nr(current),                   \
  95                  ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__,       \
  96                  __func__, ##__VA_ARGS__)
  97 #else
  98 #define ext_debug(ino, fmt, ...)        no_printk(fmt, ##__VA_ARGS__)
  99 #endif
 100
 101 #define ASSERT(assert)                                          \
 102 do {                                                                    \
 103         if (unlikely(!(assert))) {                                      \
 104                 printk(KERN_EMERG                                       \
 105                        "Assertion failure in %s() at %s:%d: '%s'\n",    \
 106                        __func__, __FILE__, __LINE__, #assert);          \
 107                 BUG();                                                  \
 108         }                                                               \
 109 } while (0)
 110
 111 /* data type for block offset of block group */
 112 typedef int ext4_grpblk_t;
 113
 114 /* data type for filesystem-wide blocks number */
 115 typedef unsigned long long ext4_fsblk_t;
 116
 117 /* data type for file logical block number */
 118 typedef __u32 ext4_lblk_t;
 119
 120 /* data type for block group number */
 121 typedef unsigned int ext4_group_t;
 122
 123 enum SHIFT_DIRECTION {
 124         SHIFT_LEFT = 0,
 125         SHIFT_RIGHT,
 126 };
 127
 128 /*
 129  * Flags used in mballoc's allocation_context flags field.
 130  *
 131  * Also used to show what's going on for debugging purposes when the
 132  * flag field is exported via the traceport interface
 133  */
 134
 135 /* prefer goal again. length */
 136 #define EXT4_MB_HINT_MERGE              0x0001
 137 /* blocks already reserved */
 138 #define EXT4_MB_HINT_RESERVED           0x0002
 139 /* metadata is being allocated */
 140 #define EXT4_MB_HINT_METADATA           0x0004
 141 /* first blocks in the file */
 142 #define EXT4_MB_HINT_FIRST              0x0008
 143 /* search for the best chunk */
 144 #define EXT4_MB_HINT_BEST               0x0010
 145 /* data is being allocated */
 146 #define EXT4_MB_HINT_DATA               0x0020
 147 /* don't preallocate (for tails) */
 148 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 149 /* allocate for locality group */
 150 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 151 /* allocate goal blocks or none */
 152 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 153 /* goal is meaningful */
 154 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 155 /* blocks already pre-reserved by delayed allocation */
 156 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 157 /* We are doing stream allocation */
 158 #define EXT4_MB_STREAM_ALLOC            0x0800
 159 /* Use reserved root blocks if needed */
 160 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 161 /* Use blocks from reserved pool */
 162 #define EXT4_MB_USE_RESERVED            0x2000
 163 /* Do strict check for free blocks while retrying block allocation */
 164 #define EXT4_MB_STRICT_CHECK            0x4000
 165
 166 struct ext4_allocation_request {
 167         /* target inode for block we're allocating */
 168         struct inode *inode;
 169         /* how many blocks we want to allocate */
 170         unsigned int len;
 171         /* logical block in target inode */
 172         ext4_lblk_t logical;
 173         /* the closest logical allocated block to the left */
 174         ext4_lblk_t lleft;
 175         /* the closest logical allocated block to the right */
 176         ext4_lblk_t lright;
 177         /* phys. target (a hint) */
 178         ext4_fsblk_t goal;
 179         /* phys. block for the closest logical allocated block to the left */
 180         ext4_fsblk_t pleft;
 181         /* phys. block for the closest logical allocated block to the right */
 182         ext4_fsblk_t pright;
 183         /* flags. see above EXT4_MB_HINT_* */
 184         unsigned int flags;
 185 };
 186
 187 /*
 188  * Logical to physical block mapping, used by ext4_map_blocks()
 189  *
 190  * This structure is used to pass requests into ext4_map_blocks() as
 191  * well as to store the information returned by ext4_map_blocks().  It
 192  * takes less room on the stack than a struct buffer_head.
 193  */
 194 #define EXT4_MAP_NEW            BIT(BH_New)
 195 #define EXT4_MAP_MAPPED         BIT(BH_Mapped)
 196 #define EXT4_MAP_UNWRITTEN      BIT(BH_Unwritten)
 197 #define EXT4_MAP_BOUNDARY       BIT(BH_Boundary)
 198 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 199                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 200
 201 struct ext4_map_blocks {
 202         ext4_fsblk_t m_pblk;
 203         ext4_lblk_t m_lblk;
 204         unsigned int m_len;
 205         unsigned int m_flags;
 206 };
 207
 208 /*
 209  * Block validity checking, system zone rbtree.
 210  */
 211 struct ext4_system_blocks {
 212         struct rb_root root;
 213         struct rcu_head rcu;
 214 };
 215
 216 /*
 217  * Flags for ext4_io_end->flags
 218  */
 219 #define EXT4_IO_END_UNWRITTEN   0x0001
 220
 221 struct ext4_io_end_vec {
 222         struct list_head list;          /* list of io_end_vec */
 223         loff_t offset;                  /* offset in the file */
 224         ssize_t size;                   /* size of the extent */
 225 };
 226
 227 /*
 228  * For converting unwritten extents on a work queue. 'handle' is used for
 229  * buffered writeback.
 230  */
 231 typedef struct ext4_io_end {
 232         struct list_head        list;           /* per-file finished IO list */
 233         handle_t                *handle;        /* handle reserved for extent
 234                                                  * conversion */
 235         struct inode            *inode;         /* file being written to */
 236         struct bio              *bio;           /* Linked list of completed
 237                                                  * bios covering the extent */
 238         unsigned int            flag;           /* unwritten or not */
 239         atomic_t                count;          /* reference counter */
 240         struct list_head        list_vec;       /* list of ext4_io_end_vec */
 241 } ext4_io_end_t;
 242
 243 struct ext4_io_submit {
 244         struct writeback_control *io_wbc;
 245         struct bio              *io_bio;
 246         ext4_io_end_t           *io_end;
 247         sector_t                io_next_block;
 248 };
 249
 250 /*
 251  * Special inodes numbers
 252  */
 253 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 254 #define EXT4_ROOT_INO            2      /* Root inode */
 255 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 256 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 257 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 258 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 259 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 260 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 261
 262 /* First non-reserved inode for old ext4 filesystems */
 263 #define EXT4_GOOD_OLD_FIRST_INO 11
 264
 265 /*
 266  * Maximal count of links to a file
 267  */
 268 #define EXT4_LINK_MAX           65000
 269
 270 /*
 271  * Macro-instructions used to manage several block sizes
 272  */
 273 #define EXT4_MIN_BLOCK_SIZE             1024
 274 #define EXT4_MAX_BLOCK_SIZE             65536
 275 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 276 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 277 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 278 #ifdef __KERNEL__
 279 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 280 #else
 281 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 282 #endif
 283 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 284 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 285                                          EXT4_SB(s)->s_cluster_bits)
 286 #ifdef __KERNEL__
 287 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 288 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 289 #else
 290 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 291 #endif
 292 #ifdef __KERNEL__
 293 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 294 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 295 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 296 #else
 297 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 298                                  EXT4_GOOD_OLD_INODE_SIZE : \
 299                                  (s)->s_inode_size)
 300 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 301                                  EXT4_GOOD_OLD_FIRST_INO : \
 302                                  (s)->s_first_ino)
 303 #endif
 304 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 305 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 306         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 307                                                                   blkbits))
 308
 309 /* Translate a block number to a cluster number */
 310 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 311 /* Translate a cluster number to a block number */
 312 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 313 /* Translate # of blks to # of clusters */
 314 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 315                                  (sbi)->s_cluster_bits)
 316 /* Mask out the low bits to get the starting block of the cluster */
 317 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 318                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 319 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 320                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 321 /* Fill in the low bits to get the last block of the cluster */
 322 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
 323                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
 324 /* Get the cluster offset */
 325 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 326                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 327 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 328                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 329
 330 /*
 331  * Structure of a blocks group descriptor
 332  */
 333 struct ext4_group_desc
 334 {
 335         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 336         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 337         __le32  bg_inode_table_lo;      /* Inodes table block */
 338         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 339         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 340         __le16  bg_used_dirs_count_lo;  /* Directories count */
 341         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 342         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 343         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 344         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 345         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 346         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 347         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 348         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 349         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 350         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 351         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 352         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 353         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 354         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 355         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 356         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 357         __u32   bg_reserved;
 358 };
 359
 360 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 361         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 362          sizeof(__le16))
 363 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 364         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 365          sizeof(__le16))
 366
 367 /*
 368  * Structure of a flex block group info
 369  */
 370
 371 struct flex_groups {
 372         atomic64_t      free_clusters;
 373         atomic_t        free_inodes;
 374         atomic_t        used_dirs;
 375 };
 376
 377 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 378 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 379 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 380
 381 /*
 382  * Macro-instructions used to manage group descriptors
 383  */
 384 #define EXT4_MIN_DESC_SIZE              32
 385 #define EXT4_MIN_DESC_SIZE_64BIT        64
 386 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 387 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 388 #ifdef __KERNEL__
 389 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 390 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 391 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 392 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 393 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 394 #else
 395 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 396 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 397 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 398 #endif
 399
 400 /*
 401  * Constants relative to the data blocks
 402  */
 403 #define EXT4_NDIR_BLOCKS                12
 404 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 405 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 406 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 407 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 408
 409 /*
 410  * Inode flags
 411  */
 412 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 413 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 414 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 415 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 416 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 417 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 418 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 419 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 420 /* Reserved for compression usage... */
 421 #define EXT4_DIRTY_FL                   0x00000100
 422 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 423 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 424         /* nb: was previously EXT2_ECOMPR_FL */
 425 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 426 /* End compression flags --- maybe not all used */
 427 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 428 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 429 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 430 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 431 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 432 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 433 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 434 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 435 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 436 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 437 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
 438
 439 #define EXT4_DAX_FL                     0x02000000 /* Inode is DAX */
 440
 441 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 442 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 443 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded directory */
 444 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 445
 446 /* User modifiable flags */
 447 #define EXT4_FL_USER_MODIFIABLE         (EXT4_SECRM_FL | \
 448                                          EXT4_UNRM_FL | \
 449                                          EXT4_COMPR_FL | \
 450                                          EXT4_SYNC_FL | \
 451                                          EXT4_IMMUTABLE_FL | \
 452                                          EXT4_APPEND_FL | \
 453                                          EXT4_NODUMP_FL | \
 454                                          EXT4_NOATIME_FL | \
 455                                          EXT4_JOURNAL_DATA_FL | \
 456                                          EXT4_NOTAIL_FL | \
 457                                          EXT4_DIRSYNC_FL | \
 458                                          EXT4_TOPDIR_FL | \
 459                                          EXT4_EXTENTS_FL | \
 460                                          0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
 461                                          EXT4_DAX_FL | \
 462                                          EXT4_PROJINHERIT_FL | \
 463                                          EXT4_CASEFOLD_FL)
 464
 465 /* User visible flags */
 466 #define EXT4_FL_USER_VISIBLE            (EXT4_FL_USER_MODIFIABLE | \
 467                                          EXT4_DIRTY_FL | \
 468                                          EXT4_COMPRBLK_FL | \
 469                                          EXT4_NOCOMPR_FL | \
 470                                          EXT4_ENCRYPT_FL | \
 471                                          EXT4_INDEX_FL | \
 472                                          EXT4_VERITY_FL | \
 473                                          EXT4_INLINE_DATA_FL)
 474
 475 /* Flags that should be inherited by new inodes from their parent. */
 476 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 477                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 478                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 479                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 480                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
 481                            EXT4_DAX_FL)
 482
 483 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 484 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 485                            EXT4_PROJINHERIT_FL))
 486
 487 /* Flags that are appropriate for non-directories/regular files. */
 488 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 489
 490 /* The only flags that should be swapped */
 491 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 492
 493 /* Flags which are mutually exclusive to DAX */
 494 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
 495                            EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
 496
 497 /* Mask out flags that are inappropriate for the given type of inode. */
 498 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 499 {
 500         if (S_ISDIR(mode))
 501                 return flags;
 502         else if (S_ISREG(mode))
 503                 return flags & EXT4_REG_FLMASK;
 504         else
 505                 return flags & EXT4_OTHER_FLMASK;
 506 }
 507
 508 /*
 509  * Inode flags used for atomic set/get
 510  */
 511 enum {
 512         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 513         EXT4_INODE_UNRM         = 1,    /* Undelete */
 514         EXT4_INODE_COMPR        = 2,    /* Compress file */
 515         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 516         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 517         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 518         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 519         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 520 /* Reserved for compression usage... */
 521         EXT4_INODE_DIRTY        = 8,
 522         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 523         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 524         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 525 /* End compression flags --- maybe not all used */
 526         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 527         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 528         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 529         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 530         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 531         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 532         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 533         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 534         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 535         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 536 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
 537         EXT4_INODE_DAX          = 25,   /* Inode is DAX */
 538         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 539         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 540         EXT4_INODE_CASEFOLD     = 30,   /* Casefolded directory */
 541         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 542 };
 543
 544 /*
 545  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 546  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 547  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 548  * any extra space in the compiled kernel image, otherwise, the build will fail.
 549  * It's important that these values are the same, since we are using
 550  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 551  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 552  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 553  * defined in e2fsprogs.
 554  *
 555  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 556  */
 557 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 558 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 559
 560 static inline void ext4_check_flag_values(void)
 561 {
 562         CHECK_FLAG_VALUE(SECRM);
 563         CHECK_FLAG_VALUE(UNRM);
 564         CHECK_FLAG_VALUE(COMPR);
 565         CHECK_FLAG_VALUE(SYNC);
 566         CHECK_FLAG_VALUE(IMMUTABLE);
 567         CHECK_FLAG_VALUE(APPEND);
 568         CHECK_FLAG_VALUE(NODUMP);
 569         CHECK_FLAG_VALUE(NOATIME);
 570         CHECK_FLAG_VALUE(DIRTY);
 571         CHECK_FLAG_VALUE(COMPRBLK);
 572         CHECK_FLAG_VALUE(NOCOMPR);
 573         CHECK_FLAG_VALUE(ENCRYPT);
 574         CHECK_FLAG_VALUE(INDEX);
 575         CHECK_FLAG_VALUE(IMAGIC);
 576         CHECK_FLAG_VALUE(JOURNAL_DATA);
 577         CHECK_FLAG_VALUE(NOTAIL);
 578         CHECK_FLAG_VALUE(DIRSYNC);
 579         CHECK_FLAG_VALUE(TOPDIR);
 580         CHECK_FLAG_VALUE(HUGE_FILE);
 581         CHECK_FLAG_VALUE(EXTENTS);
 582         CHECK_FLAG_VALUE(VERITY);
 583         CHECK_FLAG_VALUE(EA_INODE);
 584         CHECK_FLAG_VALUE(INLINE_DATA);
 585         CHECK_FLAG_VALUE(PROJINHERIT);
 586         CHECK_FLAG_VALUE(CASEFOLD);
 587         CHECK_FLAG_VALUE(RESERVED);
 588 }
 589
 590 /* Used to pass group descriptor data when online resize is done */
 591 struct ext4_new_group_input {
 592         __u32 group;            /* Group number for this data */
 593         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 594         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 595         __u64 inode_table;      /* Absolute block number of inode table start */
 596         __u32 blocks_count;     /* Total number of blocks in this group */
 597         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 598         __u16 unused;
 599 };
 600
 601 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 602 struct compat_ext4_new_group_input {
 603         u32 group;
 604         compat_u64 block_bitmap;
 605         compat_u64 inode_bitmap;
 606         compat_u64 inode_table;
 607         u32 blocks_count;
 608         u16 reserved_blocks;
 609         u16 unused;
 610 };
 611 #endif
 612
 613 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 614 struct ext4_new_group_data {
 615         __u32 group;
 616         __u64 block_bitmap;
 617         __u64 inode_bitmap;
 618         __u64 inode_table;
 619         __u32 blocks_count;
 620         __u16 reserved_blocks;
 621         __u16 mdata_blocks;
 622         __u32 free_clusters_count;
 623 };
 624
 625 /* Indexes used to index group tables in ext4_new_group_data */
 626 enum {
 627         BLOCK_BITMAP = 0,       /* block bitmap */
 628         INODE_BITMAP,           /* inode bitmap */
 629         INODE_TABLE,            /* inode tables */
 630         GROUP_TABLE_COUNT,
 631 };
 632
 633 /*
 634  * Flags used by ext4_map_blocks()
 635  */
 636         /* Allocate any needed blocks and/or convert an unwritten
 637            extent to be an initialized ext4 */
 638 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 639         /* Request the creation of an unwritten extent */
 640 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 641 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 642                                                  EXT4_GET_BLOCKS_CREATE)
 643         /* Caller is from the delayed allocation writeout path
 644          * finally doing the actual allocation of delayed blocks */
 645 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 646         /* caller is from the direct IO path, request to creation of an
 647         unwritten extents if not allocated, split the unwritten
 648         extent if blocks has been preallocated already*/
 649 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 650 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 651 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 652                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 653         /* Convert extent to initialized after IO complete */
 654 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 655                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 656         /* Eventual metadata allocation (due to growing extent tree)
 657          * should not fail, so try to use reserved blocks for that.*/
 658 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 659         /* Don't normalize allocation size (used for fallocate) */
 660 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 661         /* Convert written extents to unwritten */
 662 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 663         /* Write zeros to newly created written extents */
 664 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 665 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 666                                         EXT4_GET_BLOCKS_ZERO)
 667         /* Caller will submit data before dropping transaction handle. This
 668          * allows jbd2 to avoid submitting data before commit. */
 669 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 670
 671 /*
 672  * The bit position of these flags must not overlap with any of the
 673  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 674  * read_extent_tree_block(), ext4_split_extent_at(),
 675  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 676  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 677  * caching the extents when reading from the extent tree while a
 678  * truncate or punch hole operation is in progress.
 679  */
 680 #define EXT4_EX_NOCACHE                         0x40000000
 681 #define EXT4_EX_FORCE_CACHE                     0x20000000
 682 #define EXT4_EX_NOFAIL                          0x10000000
 683
 684 /*
 685  * Flags used by ext4_free_blocks
 686  */
 687 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 688 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 689 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 690 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 691 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 692 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 693 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 694
 695 /*
 696  * ioctl commands
 697  */
 698 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 699 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 700 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 701 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 702 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 703 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 704 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 705 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 706 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 707  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 708  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 709 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 710 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 711 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 712 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 713 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 714 /* ioctl codes 19--39 are reserved for fscrypt */
 715 #define EXT4_IOC_CLEAR_ES_CACHE         _IO('f', 40)
 716 #define EXT4_IOC_GETSTATE               _IOW('f', 41, __u32)
 717 #define EXT4_IOC_GET_ES_CACHE           _IOWR('f', 42, struct fiemap)
 718
 719 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 720
 721 /*
 722  * Flags for going down operation
 723  */
 724 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 725 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 726 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 727
 728 /*
 729  * Flags returned by EXT4_IOC_GETSTATE
 730  *
 731  * We only expose to userspace a subset of the state flags in
 732  * i_state_flags
 733  */
 734 #define EXT4_STATE_FLAG_EXT_PRECACHED   0x00000001
 735 #define EXT4_STATE_FLAG_NEW             0x00000002
 736 #define EXT4_STATE_FLAG_NEWENTRY        0x00000004
 737 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE  0x00000008
 738
 739 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 740 /*
 741  * ioctl commands in 32 bit emulation
 742  */
 743 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 744 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 745 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 746 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 747 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 748 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 749 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 750 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 751 #endif
 752
 753 /*
 754  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 755  * It indicates that the entry in extent status cache is for a hole.
 756  */
 757 #define EXT4_FIEMAP_EXTENT_HOLE         0x08000000
 758
 759 /* Max physical block we can address w/o extents */
 760 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 761
 762 /* Max logical block we can support */
 763 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFE
 764
 765 /*
 766  * Structure of an inode on the disk
 767  */
 768 struct ext4_inode {
 769         __le16  i_mode;         /* File mode */
 770         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 771         __le32  i_size_lo;      /* Size in bytes */
 772         __le32  i_atime;        /* Access time */
 773         __le32  i_ctime;        /* Inode Change time */
 774         __le32  i_mtime;        /* Modification time */
 775         __le32  i_dtime;        /* Deletion Time */
 776         __le16  i_gid;          /* Low 16 bits of Group Id */
 777         __le16  i_links_count;  /* Links count */
 778         __le32  i_blocks_lo;    /* Blocks count */
 779         __le32  i_flags;        /* File flags */
 780         union {
 781                 struct {
 782                         __le32  l_i_version;
 783                 } linux1;
 784                 struct {
 785                         __u32  h_i_translator;
 786                 } hurd1;
 787                 struct {
 788                         __u32  m_i_reserved1;
 789                 } masix1;
 790         } osd1;                         /* OS dependent 1 */
 791         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 792         __le32  i_generation;   /* File version (for NFS) */
 793         __le32  i_file_acl_lo;  /* File ACL */
 794         __le32  i_size_high;
 795         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 796         union {
 797                 struct {
 798                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 799                         __le16  l_i_file_acl_high;
 800                         __le16  l_i_uid_high;   /* these 2 fields */
 801                         __le16  l_i_gid_high;   /* were reserved2[0] */
 802                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 803                         __le16  l_i_reserved;
 804                 } linux2;
 805                 struct {
 806                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 807                         __u16   h_i_mode_high;
 808                         __u16   h_i_uid_high;
 809                         __u16   h_i_gid_high;
 810                         __u32   h_i_author;
 811                 } hurd2;
 812                 struct {
 813                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 814                         __le16  m_i_file_acl_high;
 815                         __u32   m_i_reserved2[2];
 816                 } masix2;
 817         } osd2;                         /* OS dependent 2 */
 818         __le16  i_extra_isize;
 819         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 820         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 821         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 822         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 823         __le32  i_crtime;       /* File Creation time */
 824         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 825         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 826         __le32  i_projid;       /* Project ID */
 827 };
 828
 829 struct move_extent {
 830         __u32 reserved;         /* should be zero */
 831         __u32 donor_fd;         /* donor file descriptor */
 832         __u64 orig_start;       /* logical start offset in block for orig */
 833         __u64 donor_start;      /* logical start offset in block for donor */
 834         __u64 len;              /* block length to be moved */
 835         __u64 moved_len;        /* moved block length */
 836 };
 837
 838 #define EXT4_EPOCH_BITS 2
 839 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 840 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 841
 842 /*
 843  * Extended fields will fit into an inode if the filesystem was formatted
 844  * with large inodes (-I 256 or larger) and there are not currently any EAs
 845  * consuming all of the available space. For new inodes we always reserve
 846  * enough space for the kernel's known extended fields, but for inodes
 847  * created with an old kernel this might not have been the case. None of
 848  * the extended inode fields is critical for correct filesystem operation.
 849  * This macro checks if a certain field fits in the inode. Note that
 850  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 851  */
 852 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 853         ((offsetof(typeof(*ext4_inode), field) +        \
 854           sizeof((ext4_inode)->field))                  \
 855         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 856             (einode)->i_extra_isize))                   \
 857
 858 /*
 859  * We use an encoding that preserves the times for extra epoch "00":
 860  *
 861  * extra  msb of                         adjust for signed
 862  * epoch  32-bit                         32-bit tv_sec to
 863  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 864  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 865  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 866  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 867  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 868  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 869  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 870  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 871  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 872  *
 873  * Note that previous versions of the kernel on 64-bit systems would
 874  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 875  * 1970.  e2fsck will correct this, assuming that it is run on the
 876  * affected filesystem before 2242.
 877  */
 878
 879 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 880 {
 881         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 882         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 883 }
 884
 885 static inline void ext4_decode_extra_time(struct timespec64 *time,
 886                                           __le32 extra)
 887 {
 888         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
 889                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 890         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 891 }
 892
 893 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 894 do {                                                                            \
 895         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 896                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 897                 (raw_inode)->xtime ## _extra =                                  \
 898                                 ext4_encode_extra_time(&(inode)->xtime);        \
 899                 }                                                               \
 900         else    \
 901                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 902 } while (0)
 903
 904 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 905 do {                                                                           \
 906         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 907                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 908         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 909                 (raw_inode)->xtime ## _extra =                                 \
 910                                 ext4_encode_extra_time(&(einode)->xtime);      \
 911 } while (0)
 912
 913 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 914 do {                                                                            \
 915         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 916         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 917                 ext4_decode_extra_time(&(inode)->xtime,                         \
 918                                        raw_inode->xtime ## _extra);             \
 919                 }                                                               \
 920         else                                                                    \
 921                 (inode)->xtime.tv_nsec = 0;                                     \
 922 } while (0)
 923
 924
 925 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 926 do {                                                                           \
 927         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 928                 (einode)->xtime.tv_sec =                                       \
 929                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 930         else                                                                   \
 931                 (einode)->xtime.tv_sec = 0;                                    \
 932         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 933                 ext4_decode_extra_time(&(einode)->xtime,                       \
 934                                        raw_inode->xtime ## _extra);            \
 935         else                                                                   \
 936                 (einode)->xtime.tv_nsec = 0;                                   \
 937 } while (0)
 938
 939 #define i_disk_version osd1.linux1.l_i_version
 940
 941 #if defined(__KERNEL__) || defined(__linux__)
 942 #define i_reserved1     osd1.linux1.l_i_reserved1
 943 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 944 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 945 #define i_uid_low       i_uid
 946 #define i_gid_low       i_gid
 947 #define i_uid_high      osd2.linux2.l_i_uid_high
 948 #define i_gid_high      osd2.linux2.l_i_gid_high
 949 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 950
 951 #elif defined(__GNU__)
 952
 953 #define i_translator    osd1.hurd1.h_i_translator
 954 #define i_uid_high      osd2.hurd2.h_i_uid_high
 955 #define i_gid_high      osd2.hurd2.h_i_gid_high
 956 #define i_author        osd2.hurd2.h_i_author
 957
 958 #elif defined(__masix__)
 959
 960 #define i_reserved1     osd1.masix1.m_i_reserved1
 961 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 962 #define i_reserved2     osd2.masix2.m_i_reserved2
 963
 964 #endif /* defined(__KERNEL__) || defined(__linux__) */
 965
 966 #include "extents_status.h"
 967 #include "fast_commit.h"
 968
 969 /*
 970  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 971  *
 972  * These are needed to avoid lockdep false positives when we need to
 973  * allocate blocks to the quota inode during ext4_map_blocks(), while
 974  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 975  * do quota tracking for the quota inode, this avoids deadlock (as
 976  * well as infinite recursion, since it isn't turtles all the way
 977  * down...)
 978  *
 979  *  I_DATA_SEM_NORMAL - Used for most inodes
 980  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 981  *                        where the second inode has larger inode number
 982  *                        than the first
 983  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 984  */
 985 enum {
 986         I_DATA_SEM_NORMAL = 0,
 987         I_DATA_SEM_OTHER,
 988         I_DATA_SEM_QUOTA,
 989 };
 990
 991
 992 /*
 993  * fourth extended file system inode data in memory
 994  */
 995 struct ext4_inode_info {
 996         __le32  i_data[15];     /* unconverted */
 997         __u32   i_dtime;
 998         ext4_fsblk_t    i_file_acl;
 999
1000         /*
1001          * i_block_group is the number of the block group which contains
1002          * this file's inode.  Constant across the lifetime of the inode,
1003          * it is used for making block allocation decisions - we try to
1004          * place a file's data blocks near its inode block, and new inodes
1005          * near to their parent directory's inode.
1006          */
1007         ext4_group_t    i_block_group;
1008         ext4_lblk_t     i_dir_start_lookup;
1009 #if (BITS_PER_LONG < 64)
1010         unsigned long   i_state_flags;          /* Dynamic state flags */
1011 #endif
1012         unsigned long   i_flags;
1013
1014         /*
1015          * Extended attributes can be read independently of the main file
1016          * data. Taking i_mutex even when reading would cause contention
1017          * between readers of EAs and writers of regular file data, so
1018          * instead we synchronize on xattr_sem when reading or changing
1019          * EAs.
1020          */
1021         struct rw_semaphore xattr_sem;
1022
1023         struct list_head i_orphan;      /* unlinked but open inodes */
1024
1025         /* Fast commit related info */
1026
1027         struct list_head i_fc_list;     /*
1028                                          * inodes that need fast commit
1029                                          * protected by sbi->s_fc_lock.
1030                                          */
1031
1032         /* Start of lblk range that needs to be committed in this fast commit */
1033         ext4_lblk_t i_fc_lblk_start;
1034
1035         /* End of lblk range that needs to be committed in this fast commit */
1036         ext4_lblk_t i_fc_lblk_len;
1037
1038         /* Number of ongoing updates on this inode */
1039         atomic_t  i_fc_updates;
1040
1041         /* Fast commit wait queue for this inode */
1042         wait_queue_head_t i_fc_wait;
1043
1044         /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1045         struct mutex i_fc_lock;
1046
1047         /*
1048          * i_disksize keeps track of what the inode size is ON DISK, not
1049          * in memory.  During truncate, i_size is set to the new size by
1050          * the VFS prior to calling ext4_truncate(), but the filesystem won't
1051          * set i_disksize to 0 until the truncate is actually under way.
1052          *
1053          * The intent is that i_disksize always represents the blocks which
1054          * are used by this file.  This allows recovery to restart truncate
1055          * on orphans if we crash during truncate.  We actually write i_disksize
1056          * into the on-disk inode when writing inodes out, instead of i_size.
1057          *
1058          * The only time when i_disksize and i_size may be different is when
1059          * a truncate is in progress.  The only things which change i_disksize
1060          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1061          */
1062         loff_t  i_disksize;
1063
1064         /*
1065          * i_data_sem is for serialising ext4_truncate() against
1066          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1067          * data tree are chopped off during truncate. We can't do that in
1068          * ext4 because whenever we perform intermediate commits during
1069          * truncate, the inode and all the metadata blocks *must* be in a
1070          * consistent state which allows truncation of the orphans to restart
1071          * during recovery.  Hence we must fix the get_block-vs-truncate race
1072          * by other means, so we have i_data_sem.
1073          */
1074         struct rw_semaphore i_data_sem;
1075         /*
1076          * i_mmap_sem is for serializing page faults with truncate / punch hole
1077          * operations. We have to make sure that new page cannot be faulted in
1078          * a section of the inode that is being punched. We cannot easily use
1079          * i_data_sem for this since we need protection for the whole punch
1080          * operation and i_data_sem ranks below transaction start so we have
1081          * to occasionally drop it.
1082          */
1083         struct rw_semaphore i_mmap_sem;
1084         struct inode vfs_inode;
1085         struct jbd2_inode *jinode;
1086
1087         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1088
1089         /*
1090          * File creation time. Its function is same as that of
1091          * struct timespec64 i_{a,c,m}time in the generic inode.
1092          */
1093         struct timespec64 i_crtime;
1094
1095         /* mballoc */
1096         atomic_t i_prealloc_active;
1097         struct list_head i_prealloc_list;
1098         spinlock_t i_prealloc_lock;
1099
1100         /* extents status tree */
1101         struct ext4_es_tree i_es_tree;
1102         rwlock_t i_es_lock;
1103         struct list_head i_es_list;
1104         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1105         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1106         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1107                                            extents to shrink. Protected by
1108                                            i_es_lock  */
1109
1110         /* ialloc */
1111         ext4_group_t    i_last_alloc_group;
1112
1113         /* allocation reservation info for delalloc */
1114         /* In case of bigalloc, this refer to clusters rather than blocks */
1115         unsigned int i_reserved_data_blocks;
1116
1117         /* pending cluster reservations for bigalloc file systems */
1118         struct ext4_pending_tree i_pending_tree;
1119
1120         /* on-disk additional length */
1121         __u16 i_extra_isize;
1122
1123         /* Indicate the inline data space. */
1124         u16 i_inline_off;
1125         u16 i_inline_size;
1126
1127 #ifdef CONFIG_QUOTA
1128         /* quota space reservation, managed internally by quota code */
1129         qsize_t i_reserved_quota;
1130 #endif
1131
1132         /* Lock protecting lists below */
1133         spinlock_t i_completed_io_lock;
1134         /*
1135          * Completed IOs that need unwritten extents handling and have
1136          * transaction reserved
1137          */
1138         struct list_head i_rsv_conversion_list;
1139         struct work_struct i_rsv_conversion_work;
1140         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1141
1142         spinlock_t i_block_reservation_lock;
1143
1144         /*
1145          * Transactions that contain inode's metadata needed to complete
1146          * fsync and fdatasync, respectively.
1147          */
1148         tid_t i_sync_tid;
1149         tid_t i_datasync_tid;
1150
1151 #ifdef CONFIG_QUOTA
1152         struct dquot *i_dquot[MAXQUOTAS];
1153 #endif
1154
1155         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1156         __u32 i_csum_seed;
1157
1158         kprojid_t i_projid;
1159 };
1160
1161 /*
1162  * File system states
1163  */
1164 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1165 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1166 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1167 #define EXT4_FC_REPLAY                  0x0020  /* Fast commit replay ongoing */
1168
1169 /*
1170  * Misc. filesystem flags
1171  */
1172 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1173 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1174 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1175
1176 /*
1177  * Mount flags set via mount options or defaults
1178  */
1179 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1180 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1181 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1182 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1183 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1184 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1185 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1186 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1187 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1188 #ifdef CONFIG_FS_DAX
1189 #define EXT4_MOUNT_DAX_ALWAYS           0x00200 /* Direct Access */
1190 #else
1191 #define EXT4_MOUNT_DAX_ALWAYS           0
1192 #endif
1193 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1194 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1195 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1196 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1197 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1198 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1199 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1200 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1201 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1202 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1203 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1204 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1205                                                  * enable enforcement for hidden
1206                                                  * quota files */
1207 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1208                                                   * enforcement for hidden quota
1209                                                   * files */
1210 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1211                                                   * enforcement */
1212 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1213 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1214 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1215 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1216 #define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000
1217 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1218 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1219 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1220 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1221 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1222
1223 /*
1224  * Mount flags set either automatically (could not be set by mount option)
1225  * based on per file system feature or property or in special cases such as
1226  * distinguishing between explicit mount option definition and default.
1227  */
1228 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1229                                                       specified delalloc */
1230 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1231                                                       size of blocksize * 8
1232                                                       blocks */
1233 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1234                                                       file systems */
1235 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1236                                                 specified journal checksum */
1237
1238 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1239 #define EXT4_MOUNT2_DAX_NEVER           0x00000020 /* Do not allow Direct Access */
1240 #define EXT4_MOUNT2_DAX_INODE           0x00000040 /* For printing options only */
1241
1242
1243 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1244                                                 ~EXT4_MOUNT_##opt
1245 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1246                                                 EXT4_MOUNT_##opt
1247 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1248                                          EXT4_MOUNT_##opt)
1249
1250 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1251                                                 ~EXT4_MOUNT2_##opt
1252 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1253                                                 EXT4_MOUNT2_##opt
1254 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1255                                          EXT4_MOUNT2_##opt)
1256
1257 #define ext4_test_and_set_bit           __test_and_set_bit_le
1258 #define ext4_set_bit                    __set_bit_le
1259 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1260 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1261 #define ext4_clear_bit                  __clear_bit_le
1262 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1263 #define ext4_test_bit                   test_bit_le
1264 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1265 #define ext4_find_next_bit              find_next_bit_le
1266
1267 extern void ext4_set_bits(void *bm, int cur, int len);
1268
1269 /*
1270  * Maximal mount counts between two filesystem checks
1271  */
1272 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1273 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1274
1275 /*
1276  * Behaviour when detecting errors
1277  */
1278 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1279 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1280 #define EXT4_ERRORS_PANIC               3       /* Panic */
1281 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1282
1283 /* Metadata checksum algorithm codes */
1284 #define EXT4_CRC32C_CHKSUM              1
1285
1286 /*
1287  * Structure of the super block
1288  */
1289 struct ext4_super_block {
1290 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1291         __le32  s_blocks_count_lo;      /* Blocks count */
1292         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1293         __le32  s_free_blocks_count_lo; /* Free blocks count */
1294 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1295         __le32  s_first_data_block;     /* First Data Block */
1296         __le32  s_log_block_size;       /* Block size */
1297         __le32  s_log_cluster_size;     /* Allocation cluster size */
1298 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1299         __le32  s_clusters_per_group;   /* # Clusters per group */
1300         __le32  s_inodes_per_group;     /* # Inodes per group */
1301         __le32  s_mtime;                /* Mount time */
1302 /*30*/  __le32  s_wtime;                /* Write time */
1303         __le16  s_mnt_count;            /* Mount count */
1304         __le16  s_max_mnt_count;        /* Maximal mount count */
1305         __le16  s_magic;                /* Magic signature */
1306         __le16  s_state;                /* File system state */
1307         __le16  s_errors;               /* Behaviour when detecting errors */
1308         __le16  s_minor_rev_level;      /* minor revision level */
1309 /*40*/  __le32  s_lastcheck;            /* time of last check */
1310         __le32  s_checkinterval;        /* max. time between checks */
1311         __le32  s_creator_os;           /* OS */
1312         __le32  s_rev_level;            /* Revision level */
1313 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1314         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1315         /*
1316          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1317          *
1318          * Note: the difference between the compatible feature set and
1319          * the incompatible feature set is that if there is a bit set
1320          * in the incompatible feature set that the kernel doesn't
1321          * know about, it should refuse to mount the filesystem.
1322          *
1323          * e2fsck's requirements are more strict; if it doesn't know
1324          * about a feature in either the compatible or incompatible
1325          * feature set, it must abort and not try to meddle with
1326          * things it doesn't understand...
1327          */
1328         __le32  s_first_ino;            /* First non-reserved inode */
1329         __le16  s_inode_size;           /* size of inode structure */
1330         __le16  s_block_group_nr;       /* block group # of this superblock */
1331         __le32  s_feature_compat;       /* compatible feature set */
1332 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1333         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1334 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1335 /*78*/  char    s_volume_name[16];      /* volume name */
1336 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1337 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1338         /*
1339          * Performance hints.  Directory preallocation should only
1340          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1341          */
1342         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1343         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1344         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1345         /*
1346          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1347          */
1348 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1349 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1350         __le32  s_journal_dev;          /* device number of journal file */
1351         __le32  s_last_orphan;          /* start of list of inodes to delete */
1352         __le32  s_hash_seed[4];         /* HTREE hash seed */
1353         __u8    s_def_hash_version;     /* Default hash version to use */
1354         __u8    s_jnl_backup_type;
1355         __le16  s_desc_size;            /* size of group descriptor */
1356 /*100*/ __le32  s_default_mount_opts;
1357         __le32  s_first_meta_bg;        /* First metablock block group */
1358         __le32  s_mkfs_time;            /* When the filesystem was created */
1359         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1360         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1361 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1362         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1363         __le32  s_free_blocks_count_hi; /* Free blocks count */
1364         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1365         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1366         __le32  s_flags;                /* Miscellaneous flags */
1367         __le16  s_raid_stride;          /* RAID stride */
1368         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1369         __le64  s_mmp_block;            /* Block for multi-mount protection */
1370         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1371         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1372         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1373         __u8    s_encryption_level;     /* versioning level for encryption */
1374         __u8    s_reserved_pad;         /* Padding to next 32bits */
1375         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1376         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1377         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1378         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1379                                               snapshot's future use */
1380         __le32  s_snapshot_list;        /* inode number of the head of the
1381                                            on-disk snapshot list */
1382 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1383         __le32  s_error_count;          /* number of fs errors */
1384         __le32  s_first_error_time;     /* first time an error happened */
1385         __le32  s_first_error_ino;      /* inode involved in first error */
1386         __le64  s_first_error_block;    /* block involved of first error */
1387         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1388         __le32  s_first_error_line;     /* line number where error happened */
1389         __le32  s_last_error_time;      /* most recent time of an error */
1390         __le32  s_last_error_ino;       /* inode involved in last error */
1391         __le32  s_last_error_line;      /* line number where error happened */
1392         __le64  s_last_error_block;     /* block involved of last error */
1393         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1394 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1395         __u8    s_mount_opts[64];
1396         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1397         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1398         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1399         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1400         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1401         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1402         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1403         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1404         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1405         __u8    s_wtime_hi;
1406         __u8    s_mtime_hi;
1407         __u8    s_mkfs_time_hi;
1408         __u8    s_lastcheck_hi;
1409         __u8    s_first_error_time_hi;
1410         __u8    s_last_error_time_hi;
1411         __u8    s_first_error_errcode;
1412         __u8    s_last_error_errcode;
1413         __le16  s_encoding;             /* Filename charset encoding */
1414         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1415         __le32  s_reserved[95];         /* Padding to the end of the block */
1416         __le32  s_checksum;             /* crc32c(superblock) */
1417 };
1418
1419 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1420
1421 #ifdef __KERNEL__
1422
1423 #ifdef CONFIG_FS_ENCRYPTION
1424 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL)
1425 #else
1426 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1427 #endif
1428
1429 /* Number of quota types we support */
1430 #define EXT4_MAXQUOTAS 3
1431
1432 #define EXT4_ENC_UTF8_12_1      1
1433
1434 /*
1435  * fourth extended-fs super-block data in memory
1436  */
1437 struct ext4_sb_info {
1438         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1439         unsigned long s_inodes_per_block;/* Number of inodes per block */
1440         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1441         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1442         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1443         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1444         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1445         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1446         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1447         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1448         unsigned long s_overhead;  /* # of fs overhead clusters */
1449         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1450         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1451         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1452         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1453         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1454         struct buffer_head * __rcu *s_group_desc;
1455         unsigned int s_mount_opt;
1456         unsigned int s_mount_opt2;
1457         unsigned long s_mount_flags;
1458         unsigned int s_def_mount_opt;
1459         ext4_fsblk_t s_sb_block;
1460         atomic64_t s_resv_clusters;
1461         kuid_t s_resuid;
1462         kgid_t s_resgid;
1463         unsigned short s_mount_state;
1464         unsigned short s_pad;
1465         int s_addr_per_block_bits;
1466         int s_desc_per_block_bits;
1467         int s_inode_size;
1468         int s_first_ino;
1469         unsigned int s_inode_readahead_blks;
1470         unsigned int s_inode_goal;
1471         u32 s_hash_seed[4];
1472         int s_def_hash_version;
1473         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1474         struct percpu_counter s_freeclusters_counter;
1475         struct percpu_counter s_freeinodes_counter;
1476         struct percpu_counter s_dirs_counter;
1477         struct percpu_counter s_dirtyclusters_counter;
1478         struct percpu_counter s_sra_exceeded_retry_limit;
1479         struct blockgroup_lock *s_blockgroup_lock;
1480         struct proc_dir_entry *s_proc;
1481         struct kobject s_kobj;
1482         struct completion s_kobj_unregister;
1483         struct super_block *s_sb;
1484
1485         /* Journaling */
1486         struct journal_s *s_journal;
1487         struct list_head s_orphan;
1488         struct mutex s_orphan_lock;
1489         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1490         unsigned long s_commit_interval;
1491         u32 s_max_batch_time;
1492         u32 s_min_batch_time;
1493         struct block_device *s_journal_bdev;
1494 #ifdef CONFIG_QUOTA
1495         /* Names of quota files with journalled quota */
1496         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1497         int s_jquota_fmt;                       /* Format of quota to use */
1498 #endif
1499         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1500         struct ext4_system_blocks __rcu *s_system_blks;
1501
1502 #ifdef EXTENTS_STATS
1503         /* ext4 extents stats */
1504         unsigned long s_ext_min;
1505         unsigned long s_ext_max;
1506         unsigned long s_depth_max;
1507         spinlock_t s_ext_stats_lock;
1508         unsigned long s_ext_blocks;
1509         unsigned long s_ext_extents;
1510 #endif
1511
1512         /* for buddy allocator */
1513         struct ext4_group_info ** __rcu *s_group_info;
1514         struct inode *s_buddy_cache;
1515         spinlock_t s_md_lock;
1516         unsigned short *s_mb_offsets;
1517         unsigned int *s_mb_maxs;
1518         unsigned int s_group_info_size;
1519         unsigned int s_mb_free_pending;
1520         struct list_head s_freed_data_list;     /* List of blocks to be freed
1521                                                    after commit completed */
1522
1523         /* tunables */
1524         unsigned long s_stripe;
1525         unsigned int s_mb_stream_request;
1526         unsigned int s_mb_max_to_scan;
1527         unsigned int s_mb_min_to_scan;
1528         unsigned int s_mb_stats;
1529         unsigned int s_mb_order2_reqs;
1530         unsigned int s_mb_group_prealloc;
1531         unsigned int s_mb_max_inode_prealloc;
1532         unsigned int s_max_dir_size_kb;
1533         /* where last allocation was done - for stream allocation */
1534         unsigned long s_mb_last_group;
1535         unsigned long s_mb_last_start;
1536         unsigned int s_mb_prefetch;
1537         unsigned int s_mb_prefetch_limit;
1538
1539         /* stats for buddy allocator */
1540         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1541         atomic_t s_bal_success; /* we found long enough chunks */
1542         atomic_t s_bal_allocated;       /* in blocks */
1543         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1544         atomic_t s_bal_goals;   /* goal hits */
1545         atomic_t s_bal_breaks;  /* too long searches */
1546         atomic_t s_bal_2orders; /* 2^order hits */
1547         spinlock_t s_bal_lock;
1548         unsigned long s_mb_buddies_generated;
1549         unsigned long long s_mb_generation_time;
1550         atomic_t s_mb_lost_chunks;
1551         atomic_t s_mb_preallocated;
1552         atomic_t s_mb_discarded;
1553         atomic_t s_lock_busy;
1554
1555         /* locality groups */
1556         struct ext4_locality_group __percpu *s_locality_groups;
1557
1558         /* for write statistics */
1559         unsigned long s_sectors_written_start;
1560         u64 s_kbytes_written;
1561
1562         /* the size of zero-out chunk */
1563         unsigned int s_extent_max_zeroout_kb;
1564
1565         unsigned int s_log_groups_per_flex;
1566         struct flex_groups * __rcu *s_flex_groups;
1567         ext4_group_t s_flex_groups_allocated;
1568
1569         /* workqueue for reserved extent conversions (buffered io) */
1570         struct workqueue_struct *rsv_conversion_wq;
1571
1572         /* timer for periodic error stats printing */
1573         struct timer_list s_err_report;
1574
1575         /* Lazy inode table initialization info */
1576         struct ext4_li_request *s_li_request;
1577         /* Wait multiplier for lazy initialization thread */
1578         unsigned int s_li_wait_mult;
1579
1580         /* Kernel thread for multiple mount protection */
1581         struct task_struct *s_mmp_tsk;
1582
1583         /* record the last minlen when FITRIM is called. */
1584         atomic_t s_last_trim_minblks;
1585
1586         /* Reference to checksum algorithm driver via cryptoapi */
1587         struct crypto_shash *s_chksum_driver;
1588
1589         /* Precomputed FS UUID checksum for seeding other checksums */
1590         __u32 s_csum_seed;
1591
1592         /* Reclaim extents from extent status tree */
1593         struct shrinker s_es_shrinker;
1594         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1595         long s_es_nr_inode;
1596         struct ext4_es_stats s_es_stats;
1597         struct mb_cache *s_ea_block_cache;
1598         struct mb_cache *s_ea_inode_cache;
1599         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1600
1601         /* Ratelimit ext4 messages. */
1602         struct ratelimit_state s_err_ratelimit_state;
1603         struct ratelimit_state s_warning_ratelimit_state;
1604         struct ratelimit_state s_msg_ratelimit_state;
1605         atomic_t s_warning_count;
1606         atomic_t s_msg_count;
1607
1608         /* Encryption policy for '-o test_dummy_encryption' */
1609         struct fscrypt_dummy_policy s_dummy_enc_policy;
1610
1611         /*
1612          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1613          * or EXTENTS flag.
1614          */
1615         struct percpu_rw_semaphore s_writepages_rwsem;
1616         struct dax_device *s_daxdev;
1617 #ifdef CONFIG_EXT4_DEBUG
1618         unsigned long s_simulate_fail;
1619 #endif
1620         /* Record the errseq of the backing block device */
1621         errseq_t s_bdev_wb_err;
1622         spinlock_t s_bdev_wb_lock;
1623
1624         /* Information about errors that happened during this mount */
1625         spinlock_t s_error_lock;
1626         int s_add_error_count;
1627         int s_first_error_code;
1628         __u32 s_first_error_line;
1629         __u32 s_first_error_ino;
1630         __u64 s_first_error_block;
1631         const char *s_first_error_func;
1632         time64_t s_first_error_time;
1633         int s_last_error_code;
1634         __u32 s_last_error_line;
1635         __u32 s_last_error_ino;
1636         __u64 s_last_error_block;
1637         const char *s_last_error_func;
1638         time64_t s_last_error_time;
1639         /*
1640          * If we are in a context where we cannot update error information in
1641          * the on-disk superblock, we queue this work to do it.
1642          */
1643         struct work_struct s_error_work;
1644
1645         /* Ext4 fast commit stuff */
1646         atomic_t s_fc_subtid;
1647         atomic_t s_fc_ineligible_updates;
1648         /*
1649          * After commit starts, the main queue gets locked, and the further
1650          * updates get added in the staging queue.
1651          */
1652 #define FC_Q_MAIN       0
1653 #define FC_Q_STAGING    1
1654         struct list_head s_fc_q[2];     /* Inodes staged for fast commit
1655                                          * that have data changes in them.
1656                                          */
1657         struct list_head s_fc_dentry_q[2];      /* directory entry updates */
1658         unsigned int s_fc_bytes;
1659         /*
1660          * Main fast commit lock. This lock protects accesses to the
1661          * following fields:
1662          * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1663          */
1664         spinlock_t s_fc_lock;
1665         struct buffer_head *s_fc_bh;
1666         struct ext4_fc_stats s_fc_stats;
1667         u64 s_fc_avg_commit_time;
1668 #ifdef CONFIG_EXT4_DEBUG
1669         int s_fc_debug_max_replay;
1670 #endif
1671         struct ext4_fc_replay_state s_fc_replay_state;
1672 };
1673
1674 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1675 {
1676         return sb->s_fs_info;
1677 }
1678 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1679 {
1680         return container_of(inode, struct ext4_inode_info, vfs_inode);
1681 }
1682
1683 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1684 {
1685         return ino == EXT4_ROOT_INO ||
1686                 (ino >= EXT4_FIRST_INO(sb) &&
1687                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1688 }
1689
1690 /*
1691  * Returns: sbi->field[index]
1692  * Used to access an array element from the following sbi fields which require
1693  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1694  * - s_group_desc
1695  * - s_group_info
1696  * - s_flex_group
1697  */
1698 #define sbi_array_rcu_deref(sbi, field, index)                             \
1699 ({                                                                         \
1700         typeof(*((sbi)->field)) _v;                                        \
1701         rcu_read_lock();                                                   \
1702         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1703         rcu_read_unlock();                                                 \
1704         _v;                                                                \
1705 })
1706
1707 /*
1708  * run-time mount flags
1709  */
1710 enum {
1711         EXT4_MF_MNTDIR_SAMPLED,
1712         EXT4_MF_FS_ABORTED,     /* Fatal error detected */
1713         EXT4_MF_FC_INELIGIBLE,  /* Fast commit ineligible */
1714         EXT4_MF_FC_COMMITTING   /* File system underoing a fast
1715                                  * commit.
1716                                  */
1717 };
1718
1719 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1720 {
1721         set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1722 }
1723
1724 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1725 {
1726         clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1727 }
1728
1729 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1730 {
1731         return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1732 }
1733
1734
1735 /*
1736  * Simulate_fail codes
1737  */
1738 #define EXT4_SIM_BBITMAP_EIO    1
1739 #define EXT4_SIM_BBITMAP_CRC    2
1740 #define EXT4_SIM_IBITMAP_EIO    3
1741 #define EXT4_SIM_IBITMAP_CRC    4
1742 #define EXT4_SIM_INODE_EIO      5
1743 #define EXT4_SIM_INODE_CRC      6
1744 #define EXT4_SIM_DIRBLOCK_EIO   7
1745 #define EXT4_SIM_DIRBLOCK_CRC   8
1746
1747 static inline bool ext4_simulate_fail(struct super_block *sb,
1748                                      unsigned long code)
1749 {
1750 #ifdef CONFIG_EXT4_DEBUG
1751         struct ext4_sb_info *sbi = EXT4_SB(sb);
1752
1753         if (unlikely(sbi->s_simulate_fail == code)) {
1754                 sbi->s_simulate_fail = 0;
1755                 return true;
1756         }
1757 #endif
1758         return false;
1759 }
1760
1761 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1762                                          struct buffer_head *bh,
1763                                          unsigned long code)
1764 {
1765         if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1766                 clear_buffer_uptodate(bh);
1767 }
1768
1769 /*
1770  * Error number codes for s_{first,last}_error_errno
1771  *
1772  * Linux errno numbers are architecture specific, so we need to translate
1773  * them into something which is architecture independent.   We don't define
1774  * codes for all errno's; just the ones which are most likely to be the cause
1775  * of an ext4_error() call.
1776  */
1777 #define EXT4_ERR_UNKNOWN         1
1778 #define EXT4_ERR_EIO             2
1779 #define EXT4_ERR_ENOMEM          3
1780 #define EXT4_ERR_EFSBADCRC       4
1781 #define EXT4_ERR_EFSCORRUPTED    5
1782 #define EXT4_ERR_ENOSPC          6
1783 #define EXT4_ERR_ENOKEY          7
1784 #define EXT4_ERR_EROFS           8
1785 #define EXT4_ERR_EFBIG           9
1786 #define EXT4_ERR_EEXIST         10
1787 #define EXT4_ERR_ERANGE         11
1788 #define EXT4_ERR_EOVERFLOW      12
1789 #define EXT4_ERR_EBUSY          13
1790 #define EXT4_ERR_ENOTDIR        14
1791 #define EXT4_ERR_ENOTEMPTY      15
1792 #define EXT4_ERR_ESHUTDOWN      16
1793 #define EXT4_ERR_EFAULT         17
1794
1795 /*
1796  * Inode dynamic state flags
1797  */
1798 enum {
1799         EXT4_STATE_JDATA,               /* journaled data exists */
1800         EXT4_STATE_NEW,                 /* inode is newly created */
1801         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1802         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1803         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1804         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1805         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1806         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1807         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1808         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1809         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1810         EXT4_STATE_FC_COMMITTING,       /* Fast commit ongoing */
1811 };
1812
1813 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1814 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1815 {                                                                       \
1816         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1817 }                                                                       \
1818 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1819 {                                                                       \
1820         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1821 }                                                                       \
1822 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1823 {                                                                       \
1824         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1825 }
1826
1827 /* Add these declarations here only so that these functions can be
1828  * found by name.  Otherwise, they are very hard to locate. */
1829 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1830 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1831 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1832 EXT4_INODE_BIT_FNS(flag, flags, 0)
1833
1834 /* Add these declarations here only so that these functions can be
1835  * found by name.  Otherwise, they are very hard to locate. */
1836 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1837 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1838 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1839 #if (BITS_PER_LONG < 64)
1840 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1841
1842 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1843 {
1844         (ei)->i_state_flags = 0;
1845 }
1846 #else
1847 EXT4_INODE_BIT_FNS(state, flags, 32)
1848
1849 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1850 {
1851         /* We depend on the fact that callers will set i_flags */
1852 }
1853 #endif
1854 #else
1855 /* Assume that user mode programs are passing in an ext4fs superblock, not
1856  * a kernel struct super_block.  This will allow us to call the feature-test
1857  * macros from user land. */
1858 #define EXT4_SB(sb)     (sb)
1859 #endif
1860
1861 static inline bool ext4_verity_in_progress(struct inode *inode)
1862 {
1863         return IS_ENABLED(CONFIG_FS_VERITY) &&
1864                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1865 }
1866
1867 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1868
1869 /*
1870  * Codes for operating systems
1871  */
1872 #define EXT4_OS_LINUX           0
1873 #define EXT4_OS_HURD            1
1874 #define EXT4_OS_MASIX           2
1875 #define EXT4_OS_FREEBSD         3
1876 #define EXT4_OS_LITES           4
1877
1878 /*
1879  * Revision levels
1880  */
1881 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1882 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1883
1884 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1885
1886 #define EXT4_GOOD_OLD_INODE_SIZE 128
1887
1888 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1889 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1890 #define EXT4_TIMESTAMP_MIN              S32_MIN
1891
1892 /*
1893  * Feature set definitions
1894  */
1895
1896 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1897 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1898 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1899 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1900 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1901 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1902 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1903 /*
1904  * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1905  * incompatible only if fast commit blocks are present in the FS. Since we
1906  * clear the journal (and thus the fast commit blocks), we don't mark FS as
1907  * incompatible. We also have a JBD2 incompat feature, which gets set when
1908  * there are fast commit blocks present in the journal.
1909  */
1910 #define EXT4_FEATURE_COMPAT_FAST_COMMIT         0x0400
1911 #define EXT4_FEATURE_COMPAT_STABLE_INODES       0x0800
1912
1913 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1914 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1915 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1916 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1917 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1918 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1919 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1920 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1921 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1922 /*
1923  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1924  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1925  * all other data structures' checksums.  However, the METADATA_CSUM and
1926  * GDT_CSUM bits are mutually exclusive.
1927  */
1928 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1929 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1930 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1931 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
1932
1933 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1934 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1935 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1936 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1937 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1938 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1939 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1940 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1941 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1942 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1943 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1944 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1945 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1946 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1947 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1948 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
1949
1950 extern void ext4_update_dynamic_rev(struct super_block *sb);
1951
1952 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1953 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1954 { \
1955         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1956                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1957 } \
1958 static inline void ext4_set_feature_##name(struct super_block *sb) \
1959 { \
1960         ext4_update_dynamic_rev(sb); \
1961         EXT4_SB(sb)->s_es->s_feature_compat |= \
1962                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1963 } \
1964 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1965 { \
1966         EXT4_SB(sb)->s_es->s_feature_compat &= \
1967                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1968 }
1969
1970 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1971 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1972 { \
1973         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1974                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1975 } \
1976 static inline void ext4_set_feature_##name(struct super_block *sb) \
1977 { \
1978         ext4_update_dynamic_rev(sb); \
1979         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1980                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1981 } \
1982 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1983 { \
1984         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1985                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1986 }
1987
1988 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1989 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1990 { \
1991         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1992                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1993 } \
1994 static inline void ext4_set_feature_##name(struct super_block *sb) \
1995 { \
1996         ext4_update_dynamic_rev(sb); \
1997         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1998                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1999 } \
2000 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2001 { \
2002         EXT4_SB(sb)->s_es->s_feature_incompat &= \
2003                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2004 }
2005
2006 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
2007 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
2008 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
2009 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
2010 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
2011 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
2012 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
2013 EXT4_FEATURE_COMPAT_FUNCS(fast_commit,          FAST_COMMIT)
2014 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,        STABLE_INODES)
2015
2016 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
2017 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
2018 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
2019 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
2020 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
2021 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
2022 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
2023 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
2024 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
2025 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
2026 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
2027 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
2028 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
2029
2030 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
2031 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
2032 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
2033 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
2034 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
2035 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
2036 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
2037 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
2038 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
2039 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
2040 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
2041 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
2042 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
2043 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
2044 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
2045 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
2046
2047 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2048 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2049                                          EXT4_FEATURE_INCOMPAT_META_BG)
2050 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2051                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2052                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2053
2054 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2055 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2056                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2057                                          EXT4_FEATURE_INCOMPAT_META_BG)
2058 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2059                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2060                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2061
2062 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2063 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2064                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2065                                          EXT4_FEATURE_INCOMPAT_META_BG| \
2066                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
2067                                          EXT4_FEATURE_INCOMPAT_64BIT| \
2068                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2069                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
2070                                          EXT4_FEATURE_INCOMPAT_MMP | \
2071                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2072                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2073                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2074                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2075                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
2076 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2077                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2078                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2079                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2080                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2081                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2082                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2083                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2084                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2085                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
2086                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
2087                                          EXT4_FEATURE_RO_COMPAT_VERITY)
2088
2089 #define EXTN_FEATURE_FUNCS(ver) \
2090 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2091 { \
2092         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2093                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2094 } \
2095 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2096 { \
2097         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2098                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2099 } \
2100 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2101 { \
2102         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2103                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2104 }
2105
2106 EXTN_FEATURE_FUNCS(2)
2107 EXTN_FEATURE_FUNCS(3)
2108 EXTN_FEATURE_FUNCS(4)
2109
2110 static inline bool ext4_has_compat_features(struct super_block *sb)
2111 {
2112         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2113 }
2114 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2115 {
2116         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2117 }
2118 static inline bool ext4_has_incompat_features(struct super_block *sb)
2119 {
2120         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2121 }
2122
2123 /*
2124  * Superblock flags
2125  */
2126 #define EXT4_FLAGS_RESIZING     0
2127 #define EXT4_FLAGS_SHUTDOWN     1
2128 #define EXT4_FLAGS_BDEV_IS_DAX  2
2129
2130 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2131 {
2132         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2133 }
2134
2135
2136 /*
2137  * Default values for user and/or group using reserved blocks
2138  */
2139 #define EXT4_DEF_RESUID         0
2140 #define EXT4_DEF_RESGID         0
2141
2142 /*
2143  * Default project ID
2144  */
2145 #define EXT4_DEF_PROJID         0
2146
2147 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
2148
2149 /*
2150  * Default mount options
2151  */
2152 #define EXT4_DEFM_DEBUG         0x0001
2153 #define EXT4_DEFM_BSDGROUPS     0x0002
2154 #define EXT4_DEFM_XATTR_USER    0x0004
2155 #define EXT4_DEFM_ACL           0x0008
2156 #define EXT4_DEFM_UID16         0x0010
2157 #define EXT4_DEFM_JMODE         0x0060
2158 #define EXT4_DEFM_JMODE_DATA    0x0020
2159 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2160 #define EXT4_DEFM_JMODE_WBACK   0x0060
2161 #define EXT4_DEFM_NOBARRIER     0x0100
2162 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2163 #define EXT4_DEFM_DISCARD       0x0400
2164 #define EXT4_DEFM_NODELALLOC    0x0800
2165
2166 /*
2167  * Default journal batch times
2168  */
2169 #define EXT4_DEF_MIN_BATCH_TIME 0
2170 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2171
2172 /*
2173  * Minimum number of groups in a flexgroup before we separate out
2174  * directories into the first block group of a flexgroup
2175  */
2176 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2177
2178 /*
2179  * Structure of a directory entry
2180  */
2181 #define EXT4_NAME_LEN 255
2182
2183 struct ext4_dir_entry {
2184         __le32  inode;                  /* Inode number */
2185         __le16  rec_len;                /* Directory entry length */
2186         __le16  name_len;               /* Name length */
2187         char    name[EXT4_NAME_LEN];    /* File name */
2188 };
2189
2190 /*
2191  * The new version of the directory entry.  Since EXT4 structures are
2192  * stored in intel byte order, and the name_len field could never be
2193  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2194  * file_type field.
2195  */
2196 struct ext4_dir_entry_2 {
2197         __le32  inode;                  /* Inode number */
2198         __le16  rec_len;                /* Directory entry length */
2199         __u8    name_len;               /* Name length */
2200         __u8    file_type;              /* See file type macros EXT4_FT_* below */
2201         char    name[EXT4_NAME_LEN];    /* File name */
2202 };
2203
2204 /*
2205  * This is a bogus directory entry at the end of each leaf block that
2206  * records checksums.
2207  */
2208 struct ext4_dir_entry_tail {
2209         __le32  det_reserved_zero1;     /* Pretend to be unused */
2210         __le16  det_rec_len;            /* 12 */
2211         __u8    det_reserved_zero2;     /* Zero name length */
2212         __u8    det_reserved_ft;        /* 0xDE, fake file type */
2213         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
2214 };
2215
2216 #define EXT4_DIRENT_TAIL(block, blocksize) \
2217         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2218                                         ((blocksize) - \
2219                                          sizeof(struct ext4_dir_entry_tail))))
2220
2221 /*
2222  * Ext4 directory file types.  Only the low 3 bits are used.  The
2223  * other bits are reserved for now.
2224  */
2225 #define EXT4_FT_UNKNOWN         0
2226 #define EXT4_FT_REG_FILE        1
2227 #define EXT4_FT_DIR             2
2228 #define EXT4_FT_CHRDEV          3
2229 #define EXT4_FT_BLKDEV          4
2230 #define EXT4_FT_FIFO            5
2231 #define EXT4_FT_SOCK            6
2232 #define EXT4_FT_SYMLINK         7
2233
2234 #define EXT4_FT_MAX             8
2235
2236 #define EXT4_FT_DIR_CSUM        0xDE
2237
2238 /*
2239  * EXT4_DIR_PAD defines the directory entries boundaries
2240  *
2241  * NOTE: It must be a multiple of 4
2242  */
2243 #define EXT4_DIR_PAD                    4
2244 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2245 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
2246                                          ~EXT4_DIR_ROUND)
2247 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2248
2249 /*
2250  * If we ever get support for fs block sizes > page_size, we'll need
2251  * to remove the #if statements in the next two functions...
2252  */
2253 static inline unsigned int
2254 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2255 {
2256         unsigned len = le16_to_cpu(dlen);
2257
2258 #if (PAGE_SIZE >= 65536)
2259         if (len == EXT4_MAX_REC_LEN || len == 0)
2260                 return blocksize;
2261         return (len & 65532) | ((len & 3) << 16);
2262 #else
2263         return len;
2264 #endif
2265 }
2266
2267 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2268 {
2269         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2270                 BUG();
2271 #if (PAGE_SIZE >= 65536)
2272         if (len < 65536)
2273                 return cpu_to_le16(len);
2274         if (len == blocksize) {
2275                 if (blocksize == 65536)
2276                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2277                 else
2278                         return cpu_to_le16(0);
2279         }
2280         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2281 #else
2282         return cpu_to_le16(len);
2283 #endif
2284 }
2285
2286 /*
2287  * Hash Tree Directory indexing
2288  * (c) Daniel Phillips, 2001
2289  */
2290
2291 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2292                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2293 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2294                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2295 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2296
2297 /* Legal values for the dx_root hash_version field: */
2298
2299 #define DX_HASH_LEGACY                  0
2300 #define DX_HASH_HALF_MD4                1
2301 #define DX_HASH_TEA                     2
2302 #define DX_HASH_LEGACY_UNSIGNED         3
2303 #define DX_HASH_HALF_MD4_UNSIGNED       4
2304 #define DX_HASH_TEA_UNSIGNED            5
2305
2306 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2307                               const void *address, unsigned int length)
2308 {
2309         struct {
2310                 struct shash_desc shash;
2311                 char ctx[4];
2312         } desc;
2313
2314         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2315
2316         desc.shash.tfm = sbi->s_chksum_driver;
2317         *(u32 *)desc.ctx = crc;
2318
2319         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2320
2321         return *(u32 *)desc.ctx;
2322 }
2323
2324 #ifdef __KERNEL__
2325
2326 /* hash info structure used by the directory hash */
2327 struct dx_hash_info
2328 {
2329         u32             hash;
2330         u32             minor_hash;
2331         int             hash_version;
2332         u32             *seed;
2333 };
2334
2335
2336 /* 32 and 64 bit signed EOF for dx directories */
2337 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2338 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2339
2340
2341 /*
2342  * Control parameters used by ext4_htree_next_block
2343  */
2344 #define HASH_NB_ALWAYS          1
2345
2346 struct ext4_filename {
2347         const struct qstr *usr_fname;
2348         struct fscrypt_str disk_name;
2349         struct dx_hash_info hinfo;
2350 #ifdef CONFIG_FS_ENCRYPTION
2351         struct fscrypt_str crypto_buf;
2352 #endif
2353 #ifdef CONFIG_UNICODE
2354         struct fscrypt_str cf_name;
2355 #endif
2356 };
2357
2358 #define fname_name(p) ((p)->disk_name.name)
2359 #define fname_len(p)  ((p)->disk_name.len)
2360
2361 /*
2362  * Describe an inode's exact location on disk and in memory
2363  */
2364 struct ext4_iloc
2365 {
2366         struct buffer_head *bh;
2367         unsigned long offset;
2368         ext4_group_t block_group;
2369 };
2370
2371 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2372 {
2373         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2374 }
2375
2376 static inline bool ext4_is_quota_file(struct inode *inode)
2377 {
2378         return IS_NOQUOTA(inode) &&
2379                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2380 }
2381
2382 /*
2383  * This structure is stuffed into the struct file's private_data field
2384  * for directories.  It is where we put information so that we can do
2385  * readdir operations in hash tree order.
2386  */
2387 struct dir_private_info {
2388         struct rb_root  root;
2389         struct rb_node  *curr_node;
2390         struct fname    *extra_fname;
2391         loff_t          last_pos;
2392         __u32           curr_hash;
2393         __u32           curr_minor_hash;
2394         __u32           next_hash;
2395 };
2396
2397 /* calculate the first block number of the group */
2398 static inline ext4_fsblk_t
2399 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2400 {
2401         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2402                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2403 }
2404
2405 /*
2406  * Special error return code only used by dx_probe() and its callers.
2407  */
2408 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2409
2410 /* htree levels for ext4 */
2411 #define EXT4_HTREE_LEVEL_COMPAT 2
2412 #define EXT4_HTREE_LEVEL        3
2413
2414 static inline int ext4_dir_htree_level(struct super_block *sb)
2415 {
2416         return ext4_has_feature_largedir(sb) ?
2417                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2418 }
2419
2420 /*
2421  * Timeout and state flag for lazy initialization inode thread.
2422  */
2423 #define EXT4_DEF_LI_WAIT_MULT                   10
2424 #define EXT4_DEF_LI_MAX_START_DELAY             5
2425 #define EXT4_LAZYINIT_QUIT                      0x0001
2426 #define EXT4_LAZYINIT_RUNNING                   0x0002
2427
2428 /*
2429  * Lazy inode table initialization info
2430  */
2431 struct ext4_lazy_init {
2432         unsigned long           li_state;
2433         struct list_head        li_request_list;
2434         struct mutex            li_list_mtx;
2435 };
2436
2437 enum ext4_li_mode {
2438         EXT4_LI_MODE_PREFETCH_BBITMAP,
2439         EXT4_LI_MODE_ITABLE,
2440 };
2441
2442 struct ext4_li_request {
2443         struct super_block      *lr_super;
2444         enum ext4_li_mode       lr_mode;
2445         ext4_group_t            lr_first_not_zeroed;
2446         ext4_group_t            lr_next_group;
2447         struct list_head        lr_request;
2448         unsigned long           lr_next_sched;
2449         unsigned long           lr_timeout;
2450 };
2451
2452 struct ext4_features {
2453         struct kobject f_kobj;
2454         struct completion f_kobj_unregister;
2455 };
2456
2457 /*
2458  * This structure will be used for multiple mount protection. It will be
2459  * written into the block number saved in the s_mmp_block field in the
2460  * superblock. Programs that check MMP should assume that if
2461  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2462  * to use the filesystem, regardless of how old the timestamp is.
2463  */
2464 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2465 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2466 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2467 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2468
2469 struct mmp_struct {
2470         __le32  mmp_magic;              /* Magic number for MMP */
2471         __le32  mmp_seq;                /* Sequence no. updated periodically */
2472
2473         /*
2474          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2475          * purposes and do not affect the correctness of the algorithm
2476          */
2477         __le64  mmp_time;               /* Time last updated */
2478         char    mmp_nodename[64];       /* Node which last updated MMP block */
2479         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2480
2481         /*
2482          * mmp_check_interval is used to verify if the MMP block has been
2483          * updated on the block device. The value is updated based on the
2484          * maximum time to write the MMP block during an update cycle.
2485          */
2486         __le16  mmp_check_interval;
2487
2488         __le16  mmp_pad1;
2489         __le32  mmp_pad2[226];
2490         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2491 };
2492
2493 /* arguments passed to the mmp thread */
2494 struct mmpd_data {
2495         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2496         struct super_block *sb;  /* super block of the fs */
2497 };
2498
2499 /*
2500  * Check interval multiplier
2501  * The MMP block is written every update interval and initially checked every
2502  * update interval x the multiplier (the value is then adapted based on the
2503  * write latency). The reason is that writes can be delayed under load and we
2504  * don't want readers to incorrectly assume that the filesystem is no longer
2505  * in use.
2506  */
2507 #define EXT4_MMP_CHECK_MULT             2UL
2508
2509 /*
2510  * Minimum interval for MMP checking in seconds.
2511  */
2512 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2513
2514 /*
2515  * Maximum interval for MMP checking in seconds.
2516  */
2517 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2518
2519 /*
2520  * Function prototypes
2521  */
2522
2523 /*
2524  * Ok, these declarations are also in <linux/kernel.h> but none of the
2525  * ext4 source programs needs to include it so they are duplicated here.
2526  */
2527 # define NORET_TYPE     /**/
2528 # define ATTRIB_NORET   __attribute__((noreturn))
2529 # define NORET_AND      noreturn,
2530
2531 /* bitmap.c */
2532 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2533 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2534                                 struct ext4_group_desc *gdp,
2535                                 struct buffer_head *bh, int sz);
2536 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2537                                   struct ext4_group_desc *gdp,
2538                                   struct buffer_head *bh, int sz);
2539 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2540                                 struct ext4_group_desc *gdp,
2541                                 struct buffer_head *bh);
2542 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2543                                   struct ext4_group_desc *gdp,
2544                                   struct buffer_head *bh);
2545
2546 /* balloc.c */
2547 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2548                                          ext4_fsblk_t blocknr,
2549                                          ext4_group_t *blockgrpp,
2550                                          ext4_grpblk_t *offsetp);
2551 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2552                                           ext4_fsblk_t block);
2553
2554 extern unsigned int ext4_block_group(struct super_block *sb,
2555                         ext4_fsblk_t blocknr);
2556 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2557                         ext4_fsblk_t blocknr);
2558 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2559 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2560                         ext4_group_t group);
2561 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2562                                          ext4_fsblk_t goal,
2563                                          unsigned int flags,
2564                                          unsigned long *count,
2565                                          int *errp);
2566 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2567                                     s64 nclusters, unsigned int flags);
2568 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2569 extern void ext4_check_blocks_bitmap(struct super_block *);
2570 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2571                                                     ext4_group_t block_group,
2572                                                     struct buffer_head ** bh);
2573 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2574
2575 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2576                                                 ext4_group_t block_group,
2577                                                 bool ignore_locked);
2578 extern int ext4_wait_block_bitmap(struct super_block *sb,
2579                                   ext4_group_t block_group,
2580                                   struct buffer_head *bh);
2581 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2582                                                   ext4_group_t block_group);
2583 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2584                                               ext4_group_t block_group,
2585                                               struct ext4_group_desc *gdp);
2586 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2587
2588 #ifdef CONFIG_UNICODE
2589 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2590                                          const struct qstr *iname,
2591                                          struct fscrypt_str *fname);
2592 #endif
2593
2594 #ifdef CONFIG_FS_ENCRYPTION
2595 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2596                                                 const struct fscrypt_name *src)
2597 {
2598         memset(dst, 0, sizeof(*dst));
2599
2600         dst->usr_fname = src->usr_fname;
2601         dst->disk_name = src->disk_name;
2602         dst->hinfo.hash = src->hash;
2603         dst->hinfo.minor_hash = src->minor_hash;
2604         dst->crypto_buf = src->crypto_buf;
2605 }
2606
2607 static inline int ext4_fname_setup_filename(struct inode *dir,
2608                                             const struct qstr *iname,
2609                                             int lookup,
2610                                             struct ext4_filename *fname)
2611 {
2612         struct fscrypt_name name;
2613         int err;
2614
2615         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2616         if (err)
2617                 return err;
2618
2619         ext4_fname_from_fscrypt_name(fname, &name);
2620
2621 #ifdef CONFIG_UNICODE
2622         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2623 #endif
2624         return 0;
2625 }
2626
2627 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2628                                             struct dentry *dentry,
2629                                             struct ext4_filename *fname)
2630 {
2631         struct fscrypt_name name;
2632         int err;
2633
2634         err = fscrypt_prepare_lookup(dir, dentry, &name);
2635         if (err)
2636                 return err;
2637
2638         ext4_fname_from_fscrypt_name(fname, &name);
2639
2640 #ifdef CONFIG_UNICODE
2641         ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2642 #endif
2643         return 0;
2644 }
2645
2646 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2647 {
2648         struct fscrypt_name name;
2649
2650         name.crypto_buf = fname->crypto_buf;
2651         fscrypt_free_filename(&name);
2652
2653         fname->crypto_buf.name = NULL;
2654         fname->usr_fname = NULL;
2655         fname->disk_name.name = NULL;
2656
2657 #ifdef CONFIG_UNICODE
2658         kfree(fname->cf_name.name);
2659         fname->cf_name.name = NULL;
2660 #endif
2661 }
2662 #else /* !CONFIG_FS_ENCRYPTION */
2663 static inline int ext4_fname_setup_filename(struct inode *dir,
2664                                             const struct qstr *iname,
2665                                             int lookup,
2666                                             struct ext4_filename *fname)
2667 {
2668         fname->usr_fname = iname;
2669         fname->disk_name.name = (unsigned char *) iname->name;
2670         fname->disk_name.len = iname->len;
2671
2672 #ifdef CONFIG_UNICODE
2673         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2674 #endif
2675
2676         return 0;
2677 }
2678
2679 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2680                                             struct dentry *dentry,
2681                                             struct ext4_filename *fname)
2682 {
2683         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2684 }
2685
2686 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2687 {
2688 #ifdef CONFIG_UNICODE
2689         kfree(fname->cf_name.name);
2690         fname->cf_name.name = NULL;
2691 #endif
2692 }
2693 #endif /* !CONFIG_FS_ENCRYPTION */
2694
2695 /* dir.c */
2696 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2697                                   struct file *,
2698                                   struct ext4_dir_entry_2 *,
2699                                   struct buffer_head *, char *, int,
2700                                   unsigned int);
2701 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2702         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2703                                         (de), (bh), (buf), (size), (offset)))
2704 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2705                                 __u32 minor_hash,
2706                                 struct ext4_dir_entry_2 *dirent,
2707                                 struct fscrypt_str *ent_name);
2708 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2709 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2710                              struct buffer_head *bh,
2711                              void *buf, int buf_size,
2712                              struct ext4_filename *fname,
2713                              struct ext4_dir_entry_2 **dest_de);
2714 void ext4_insert_dentry(struct inode *inode,
2715                         struct ext4_dir_entry_2 *de,
2716                         int buf_size,
2717                         struct ext4_filename *fname);
2718 static inline void ext4_update_dx_flag(struct inode *inode)
2719 {
2720         if (!ext4_has_feature_dir_index(inode->i_sb) &&
2721             ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2722                 /* ext4_iget() should have caught this... */
2723                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2724                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2725         }
2726 }
2727 static const unsigned char ext4_filetype_table[] = {
2728         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2729 };
2730
2731 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2732 {
2733         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2734                 return DT_UNKNOWN;
2735
2736         return ext4_filetype_table[filetype];
2737 }
2738 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2739                              void *buf, int buf_size);
2740
2741 /* fsync.c */
2742 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2743
2744 /* hash.c */
2745 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2746                           struct dx_hash_info *hinfo);
2747
2748 /* ialloc.c */
2749 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2750 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2751                                       struct inode *, umode_t,
2752                                       const struct qstr *qstr, __u32 goal,
2753                                       uid_t *owner, __u32 i_flags,
2754                                       int handle_type, unsigned int line_no,
2755                                       int nblocks);
2756
2757 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
2758         __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr),       \
2759                          (goal), (owner), i_flags, 0, 0, 0)
2760 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2761                                     type, nblocks)                  \
2762         __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2763                          0, (type), __LINE__, (nblocks))
2764
2765
2766 extern void ext4_free_inode(handle_t *, struct inode *);
2767 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2768 extern unsigned long ext4_count_free_inodes(struct super_block *);
2769 extern unsigned long ext4_count_dirs(struct super_block *);
2770 extern void ext4_check_inodes_bitmap(struct super_block *);
2771 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2772 extern int ext4_init_inode_table(struct super_block *sb,
2773                                  ext4_group_t group, int barrier);
2774 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2775
2776 /* fast_commit.c */
2777 int ext4_fc_info_show(struct seq_file *seq, void *v);
2778 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2779 void ext4_fc_init_inode(struct inode *inode);
2780 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2781                          ext4_lblk_t end);
2782 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2783         struct dentry *dentry);
2784 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2785         struct dentry *dentry);
2786 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2787 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2788 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2789                             struct dentry *dentry);
2790 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2791 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2792 void ext4_fc_mark_ineligible(struct super_block *sb, int reason);
2793 void ext4_fc_start_ineligible(struct super_block *sb, int reason);
2794 void ext4_fc_stop_ineligible(struct super_block *sb);
2795 void ext4_fc_start_update(struct inode *inode);
2796 void ext4_fc_stop_update(struct inode *inode);
2797 void ext4_fc_del(struct inode *inode);
2798 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2799 void ext4_fc_replay_cleanup(struct super_block *sb);
2800 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2801 int __init ext4_fc_init_dentry_cache(void);
2802
2803 /* mballoc.c */
2804 extern const struct seq_operations ext4_mb_seq_groups_ops;
2805 extern long ext4_mb_stats;
2806 extern long ext4_mb_max_to_scan;
2807 extern int ext4_mb_init(struct super_block *);
2808 extern int ext4_mb_release(struct super_block *);
2809 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2810                                 struct ext4_allocation_request *, int *);
2811 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2812 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2813 extern int __init ext4_init_mballoc(void);
2814 extern void ext4_exit_mballoc(void);
2815 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2816                                      ext4_group_t group,
2817                                      unsigned int nr, int *cnt);
2818 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2819                                   unsigned int nr);
2820
2821 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2822                              struct buffer_head *bh, ext4_fsblk_t block,
2823                              unsigned long count, int flags);
2824 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2825                                    ext4_group_t ngroups);
2826 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2827                 ext4_group_t i, struct ext4_group_desc *desc);
2828 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2829                                 ext4_fsblk_t block, unsigned long count);
2830 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2831 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2832 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2833                        int len, int state);
2834
2835 /* inode.c */
2836 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2837                          struct ext4_inode_info *ei);
2838 int ext4_inode_is_fast_symlink(struct inode *inode);
2839 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2840 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2841 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2842                      bool wait, struct buffer_head **bhs);
2843 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2844                              struct buffer_head *bh_result, int create);
2845 int ext4_get_block(struct inode *inode, sector_t iblock,
2846                    struct buffer_head *bh_result, int create);
2847 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2848                            struct buffer_head *bh, int create);
2849 int ext4_walk_page_buffers(handle_t *handle,
2850                            struct buffer_head *head,
2851                            unsigned from,
2852                            unsigned to,
2853                            int *partial,
2854                            int (*fn)(handle_t *handle,
2855                                      struct buffer_head *bh));
2856 int do_journal_get_write_access(handle_t *handle,
2857                                 struct buffer_head *bh);
2858 #define FALL_BACK_TO_NONDELALLOC 1
2859 #define CONVERT_INLINE_DATA      2
2860
2861 typedef enum {
2862         EXT4_IGET_NORMAL =      0,
2863         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2864         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2865 } ext4_iget_flags;
2866
2867 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2868                                  ext4_iget_flags flags, const char *function,
2869                                  unsigned int line);
2870
2871 #define ext4_iget(sb, ino, flags) \
2872         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2873
2874 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2875 extern int  ext4_setattr(struct user_namespace *, struct dentry *,
2876                          struct iattr *);
2877 extern int  ext4_getattr(struct user_namespace *, const struct path *,
2878                          struct kstat *, u32, unsigned int);
2879 extern void ext4_evict_inode(struct inode *);
2880 extern void ext4_clear_inode(struct inode *);
2881 extern int  ext4_file_getattr(struct user_namespace *, const struct path *,
2882                               struct kstat *, u32, unsigned int);
2883 extern int  ext4_sync_inode(handle_t *, struct inode *);
2884 extern void ext4_dirty_inode(struct inode *, int);
2885 extern int ext4_change_inode_journal_flag(struct inode *, int);
2886 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2887 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2888                           struct ext4_iloc *iloc);
2889 extern int ext4_inode_attach_jinode(struct inode *inode);
2890 extern int ext4_can_truncate(struct inode *inode);
2891 extern int ext4_truncate(struct inode *);
2892 extern int ext4_break_layouts(struct inode *);
2893 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2894 extern void ext4_set_inode_flags(struct inode *, bool init);
2895 extern int ext4_alloc_da_blocks(struct inode *inode);
2896 extern void ext4_set_aops(struct inode *inode);
2897 extern int ext4_writepage_trans_blocks(struct inode *);
2898 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2899 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2900                              loff_t lstart, loff_t lend);
2901 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2902 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2903 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2904 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2905 extern void ext4_da_release_space(struct inode *inode, int to_free);
2906 extern void ext4_da_update_reserve_space(struct inode *inode,
2907                                         int used, int quota_claim);
2908 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2909                               ext4_fsblk_t pblk, ext4_lblk_t len);
2910
2911 /* indirect.c */
2912 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2913                                 struct ext4_map_blocks *map, int flags);
2914 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2915 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2916 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2917                                  ext4_lblk_t start, ext4_lblk_t end);
2918
2919 /* ioctl.c */
2920 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2921 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2922 int ext4_fileattr_set(struct user_namespace *mnt_userns,
2923                       struct dentry *dentry, struct fileattr *fa);
2924 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
2925 extern void ext4_reset_inode_seed(struct inode *inode);
2926
2927 /* migrate.c */
2928 extern int ext4_ext_migrate(struct inode *);
2929 extern int ext4_ind_migrate(struct inode *inode);
2930
2931 /* namei.c */
2932 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
2933                              struct inode *inode);
2934 extern int ext4_dirblock_csum_verify(struct inode *inode,
2935                                      struct buffer_head *bh);
2936 extern int ext4_orphan_add(handle_t *, struct inode *);
2937 extern int ext4_orphan_del(handle_t *, struct inode *);
2938 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2939                                 __u32 start_minor_hash, __u32 *next_hash);
2940 extern int ext4_search_dir(struct buffer_head *bh,
2941                            char *search_buf,
2942                            int buf_size,
2943                            struct inode *dir,
2944                            struct ext4_filename *fname,
2945                            unsigned int offset,
2946                            struct ext4_dir_entry_2 **res_dir);
2947 extern int ext4_generic_delete_entry(struct inode *dir,
2948                                      struct ext4_dir_entry_2 *de_del,
2949                                      struct buffer_head *bh,
2950                                      void *entry_buf,
2951                                      int buf_size,
2952                                      int csum_size);
2953 extern bool ext4_empty_dir(struct inode *inode);
2954
2955 /* resize.c */
2956 extern void ext4_kvfree_array_rcu(void *to_free);
2957 extern int ext4_group_add(struct super_block *sb,
2958                                 struct ext4_new_group_data *input);
2959 extern int ext4_group_extend(struct super_block *sb,
2960                                 struct ext4_super_block *es,
2961                                 ext4_fsblk_t n_blocks_count);
2962 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2963
2964 /* super.c */
2965 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2966                                          sector_t block, int op_flags);
2967 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
2968                                                    sector_t block);
2969 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
2970                                 bh_end_io_t *end_io);
2971 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
2972                         bh_end_io_t *end_io);
2973 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
2974 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
2975 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2976 extern int ext4_calculate_overhead(struct super_block *sb);
2977 extern void ext4_superblock_csum_set(struct super_block *sb);
2978 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2979                                     ext4_group_t ngroup);
2980 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2981                                      char nbuf[16]);
2982 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2983                                              ext4_group_t block_group,
2984                                              unsigned int flags);
2985
2986 extern __printf(7, 8)
2987 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
2988                   int, __u64, const char *, ...);
2989 extern __printf(6, 7)
2990 void __ext4_error_inode(struct inode *, const char *, unsigned int,
2991                         ext4_fsblk_t, int, const char *, ...);
2992 extern __printf(5, 6)
2993 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2994                      const char *, ...);
2995 extern void __ext4_std_error(struct super_block *, const char *,
2996                              unsigned int, int);
2997 extern __printf(4, 5)
2998 void __ext4_warning(struct super_block *, const char *, unsigned int,
2999                     const char *, ...);
3000 extern __printf(4, 5)
3001 void __ext4_warning_inode(const struct inode *inode, const char *function,
3002                           unsigned int line, const char *fmt, ...);
3003 extern __printf(3, 4)
3004 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3005 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3006                            const char *, unsigned int, const char *);
3007 extern __printf(7, 8)
3008 void __ext4_grp_locked_error(const char *, unsigned int,
3009                              struct super_block *, ext4_group_t,
3010                              unsigned long, ext4_fsblk_t,
3011                              const char *, ...);
3012
3013 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3014         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3015
3016 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)                     \
3017         __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3018
3019 #define ext4_error_inode_block(inode, block, err, fmt, a...)            \
3020         __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3021                            (fmt), ## a)
3022
3023 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
3024         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3025
3026 #define ext4_abort(sb, err, fmt, a...)                                  \
3027         __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3028
3029 #ifdef CONFIG_PRINTK
3030
3031 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3032         __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3033 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3034         __ext4_error_inode((inode), (func), (line), (block),            \
3035                            (err), (fmt), ##__VA_ARGS__)
3036 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3037         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3038 #define ext4_error(sb, fmt, ...)                                        \
3039         __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),      \
3040                 ##__VA_ARGS__)
3041 #define ext4_error_err(sb, err, fmt, ...)                               \
3042         __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),  \
3043                 ##__VA_ARGS__)
3044 #define ext4_warning(sb, fmt, ...)                                      \
3045         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3046 #define ext4_warning_inode(inode, fmt, ...)                             \
3047         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3048 #define ext4_msg(sb, level, fmt, ...)                           \
3049         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3050 #define dump_mmp_msg(sb, mmp, msg)                                      \
3051         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3052 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3053         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3054                                 fmt, ##__VA_ARGS__)
3055
3056 #else
3057
3058 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3059 do {                                                                    \
3060         no_printk(fmt, ##__VA_ARGS__);                                  \
3061         __ext4_error_inode(inode, "", 0, block, 0, " ");                \
3062 } while (0)
3063 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3064 do {                                                                    \
3065         no_printk(fmt, ##__VA_ARGS__);                                  \
3066         __ext4_error_inode(inode, "", 0, block, err, " ");              \
3067 } while (0)
3068 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3069 do {                                                                    \
3070         no_printk(fmt, ##__VA_ARGS__);                                  \
3071         __ext4_error_file(file, "", 0, block, " ");                     \
3072 } while (0)
3073 #define ext4_error(sb, fmt, ...)                                        \
3074 do {                                                                    \
3075         no_printk(fmt, ##__VA_ARGS__);                                  \
3076         __ext4_error(sb, "", 0, false, 0, 0, " ");                      \
3077 } while (0)
3078 #define ext4_error_err(sb, err, fmt, ...)                               \
3079 do {                                                                    \
3080         no_printk(fmt, ##__VA_ARGS__);                                  \
3081         __ext4_error(sb, "", 0, false, err, 0, " ");                    \
3082 } while (0)
3083 #define ext4_warning(sb, fmt, ...)                                      \
3084 do {                                                                    \
3085         no_printk(fmt, ##__VA_ARGS__);                                  \
3086         __ext4_warning(sb, "", 0, " ");                                 \
3087 } while (0)
3088 #define ext4_warning_inode(inode, fmt, ...)                             \
3089 do {                                                                    \
3090         no_printk(fmt, ##__VA_ARGS__);                                  \
3091         __ext4_warning_inode(inode, "", 0, " ");                        \
3092 } while (0)
3093 #define ext4_msg(sb, level, fmt, ...)                                   \
3094 do {                                                                    \
3095         no_printk(fmt, ##__VA_ARGS__);                                  \
3096         __ext4_msg(sb, "", " ");                                        \
3097 } while (0)
3098 #define dump_mmp_msg(sb, mmp, msg)                                      \
3099         __dump_mmp_msg(sb, mmp, "", 0, "")
3100 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3101 do {                                                                    \
3102         no_printk(fmt, ##__VA_ARGS__);                          \
3103         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
3104 } while (0)
3105
3106 #endif
3107
3108 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3109                                       struct ext4_group_desc *bg);
3110 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3111                                       struct ext4_group_desc *bg);
3112 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3113                                      struct ext4_group_desc *bg);
3114 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3115                                       struct ext4_group_desc *bg);
3116 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3117                                  struct ext4_group_desc *bg);
3118 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3119                                 struct ext4_group_desc *bg);
3120 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3121                                    struct ext4_group_desc *bg);
3122 extern void ext4_block_bitmap_set(struct super_block *sb,
3123                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3124 extern void ext4_inode_bitmap_set(struct super_block *sb,
3125                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3126 extern void ext4_inode_table_set(struct super_block *sb,
3127                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3128 extern void ext4_free_group_clusters_set(struct super_block *sb,
3129                                          struct ext4_group_desc *bg,
3130                                          __u32 count);
3131 extern void ext4_free_inodes_set(struct super_block *sb,
3132                                 struct ext4_group_desc *bg, __u32 count);
3133 extern void ext4_used_dirs_set(struct super_block *sb,
3134                                 struct ext4_group_desc *bg, __u32 count);
3135 extern void ext4_itable_unused_set(struct super_block *sb,
3136                                    struct ext4_group_desc *bg, __u32 count);
3137 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3138                                        struct ext4_group_desc *gdp);
3139 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3140                                      struct ext4_group_desc *gdp);
3141 extern int ext4_register_li_request(struct super_block *sb,
3142                                     ext4_group_t first_not_zeroed);
3143
3144 static inline int ext4_has_metadata_csum(struct super_block *sb)
3145 {
3146         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3147                      !EXT4_SB(sb)->s_chksum_driver);
3148
3149         return ext4_has_feature_metadata_csum(sb) &&
3150                (EXT4_SB(sb)->s_chksum_driver != NULL);
3151 }
3152
3153 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3154 {
3155         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3156 }
3157
3158 #define ext4_read_incompat_64bit_val(es, name) \
3159         (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3160                 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3161                 le32_to_cpu(es->name##_lo))
3162
3163 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3164 {
3165         return ext4_read_incompat_64bit_val(es, s_blocks_count);
3166 }
3167
3168 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3169 {
3170         return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3171 }
3172
3173 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3174 {
3175         return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3176 }
3177
3178 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3179                                          ext4_fsblk_t blk)
3180 {
3181         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3182         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3183 }
3184
3185 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3186                                               ext4_fsblk_t blk)
3187 {
3188         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3189         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3190 }
3191
3192 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3193                                            ext4_fsblk_t blk)
3194 {
3195         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3196         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3197 }
3198
3199 static inline loff_t ext4_isize(struct super_block *sb,
3200                                 struct ext4_inode *raw_inode)
3201 {
3202         if (ext4_has_feature_largedir(sb) ||
3203             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3204                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3205                         le32_to_cpu(raw_inode->i_size_lo);
3206
3207         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3208 }
3209
3210 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3211 {
3212         raw_inode->i_size_lo = cpu_to_le32(i_size);
3213         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3214 }
3215
3216 static inline
3217 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3218                                             ext4_group_t group)
3219 {
3220          struct ext4_group_info **grp_info;
3221          long indexv, indexh;
3222          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3223          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3224          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3225          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3226          return grp_info[indexh];
3227 }
3228
3229 /*
3230  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3231  * the locking protocol documented in the comments of ext4_group_add()
3232  * in resize.c
3233  */
3234 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3235 {
3236         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
3237
3238         smp_rmb();
3239         return ngroups;
3240 }
3241
3242 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3243                                              ext4_group_t block_group)
3244 {
3245         return block_group >> sbi->s_log_groups_per_flex;
3246 }
3247
3248 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3249 {
3250         return 1 << sbi->s_log_groups_per_flex;
3251 }
3252
3253 #define ext4_std_error(sb, errno)                               \
3254 do {                                                            \
3255         if ((errno))                                            \
3256                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
3257 } while (0)
3258
3259 #ifdef CONFIG_SMP
3260 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3261  * counters. So we need to make sure we have free clusters more
3262  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3263  */
3264 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3265 #else
3266 #define EXT4_FREECLUSTERS_WATERMARK 0
3267 #endif
3268
3269 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
3270 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3271 {
3272         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3273                      !inode_is_locked(inode));
3274         down_write(&EXT4_I(inode)->i_data_sem);
3275         if (newsize > EXT4_I(inode)->i_disksize)
3276                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3277         up_write(&EXT4_I(inode)->i_data_sem);
3278 }
3279
3280 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
3281 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3282 {
3283         int changed = 0;
3284
3285         if (newsize > inode->i_size) {
3286                 i_size_write(inode, newsize);
3287                 changed = 1;
3288         }
3289         if (newsize > EXT4_I(inode)->i_disksize) {
3290                 ext4_update_i_disksize(inode, newsize);
3291                 changed |= 2;
3292         }
3293         return changed;
3294 }
3295
3296 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3297                                       loff_t len);
3298
3299 struct ext4_group_info {
3300         unsigned long   bb_state;
3301 #ifdef AGGRESSIVE_CHECK
3302         unsigned long   bb_check_counter;
3303 #endif
3304         struct rb_root  bb_free_root;
3305         ext4_grpblk_t   bb_first_free;  /* first free block */
3306         ext4_grpblk_t   bb_free;        /* total free blocks */
3307         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
3308         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
3309         struct          list_head bb_prealloc_list;
3310 #ifdef DOUBLE_CHECK
3311         void            *bb_bitmap;
3312 #endif
3313         struct rw_semaphore alloc_sem;
3314         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3315                                          * regions, index is order.
3316                                          * bb_counters[3] = 5 means
3317                                          * 5 free 8-block regions. */
3318 };
3319
3320 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3321 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3322 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3323 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3324 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3325         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3326 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3327         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3328 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT        4
3329
3330 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3331         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3332 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3333         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3334 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3335         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3336
3337 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3338         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3339 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3340         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3341 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3342         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3343 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)      \
3344         (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3345
3346 #define EXT4_MAX_CONTENTION             8
3347 #define EXT4_CONTENTION_THRESHOLD       2
3348
3349 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3350                                               ext4_group_t group)
3351 {
3352         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3353 }
3354
3355 /*
3356  * Returns true if the filesystem is busy enough that attempts to
3357  * access the block group locks has run into contention.
3358  */
3359 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3360 {
3361         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3362 }
3363
3364 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3365 {
3366         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3367         if (spin_trylock(lock))
3368                 /*
3369                  * We're able to grab the lock right away, so drop the
3370                  * lock contention counter.
3371                  */
3372                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3373         else {
3374                 /*
3375                  * The lock is busy, so bump the contention counter,
3376                  * and then wait on the spin lock.
3377                  */
3378                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3379                                   EXT4_MAX_CONTENTION);
3380                 spin_lock(lock);
3381         }
3382 }
3383
3384 static inline void ext4_unlock_group(struct super_block *sb,
3385                                         ext4_group_t group)
3386 {
3387         spin_unlock(ext4_group_lock_ptr(sb, group));
3388 }
3389
3390 #ifdef CONFIG_QUOTA
3391 static inline bool ext4_quota_capable(struct super_block *sb)
3392 {
3393         return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3394 }
3395
3396 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3397 {
3398         struct ext4_sb_info *sbi = EXT4_SB(sb);
3399
3400         return (ext4_has_feature_quota(sb) ||
3401                 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3402 }
3403 #endif
3404
3405 /*
3406  * Block validity checking
3407  */
3408 #define ext4_check_indirect_blockref(inode, bh)                         \
3409         ext4_check_blockref(__func__, __LINE__, inode,                  \
3410                             (__le32 *)(bh)->b_data,                     \
3411                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3412
3413 #define ext4_ind_check_inode(inode)                                     \
3414         ext4_check_blockref(__func__, __LINE__, inode,                  \
3415                             EXT4_I(inode)->i_data,                      \
3416                             EXT4_NDIR_BLOCKS)
3417
3418 /*
3419  * Inodes and files operations
3420  */
3421
3422 /* dir.c */
3423 extern const struct file_operations ext4_dir_operations;
3424
3425 /* file.c */
3426 extern const struct inode_operations ext4_file_inode_operations;
3427 extern const struct file_operations ext4_file_operations;
3428 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3429
3430 /* inline.c */
3431 extern int ext4_get_max_inline_size(struct inode *inode);
3432 extern int ext4_find_inline_data_nolock(struct inode *inode);
3433 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3434                                  unsigned int len);
3435 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3436
3437 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3438 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3439                                          struct inode *inode,
3440                                          loff_t pos, unsigned len,
3441                                          unsigned flags,
3442                                          struct page **pagep);
3443 extern int ext4_write_inline_data_end(struct inode *inode,
3444                                       loff_t pos, unsigned len,
3445                                       unsigned copied,
3446                                       struct page *page);
3447 extern struct buffer_head *
3448 ext4_journalled_write_inline_data(struct inode *inode,
3449                                   unsigned len,
3450                                   struct page *page);
3451 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3452                                            struct inode *inode,
3453                                            loff_t pos, unsigned len,
3454                                            unsigned flags,
3455                                            struct page **pagep,
3456                                            void **fsdata);
3457 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3458                                          unsigned len, unsigned copied,
3459                                          struct page *page);
3460 extern int ext4_try_add_inline_entry(handle_t *handle,
3461                                      struct ext4_filename *fname,
3462                                      struct inode *dir, struct inode *inode);
3463 extern int ext4_try_create_inline_dir(handle_t *handle,
3464                                       struct inode *parent,
3465                                       struct inode *inode);
3466 extern int ext4_read_inline_dir(struct file *filp,
3467                                 struct dir_context *ctx,
3468                                 int *has_inline_data);
3469 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3470                                   struct inode *dir, ext4_lblk_t block,
3471                                   struct dx_hash_info *hinfo,
3472                                   __u32 start_hash, __u32 start_minor_hash,
3473                                   int *has_inline_data);
3474 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3475                                         struct ext4_filename *fname,
3476                                         struct ext4_dir_entry_2 **res_dir,
3477                                         int *has_inline_data);
3478 extern int ext4_delete_inline_entry(handle_t *handle,
3479                                     struct inode *dir,
3480                                     struct ext4_dir_entry_2 *de_del,
3481                                     struct buffer_head *bh,
3482                                     int *has_inline_data);
3483 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3484 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3485                                         struct ext4_dir_entry_2 **parent_de,
3486                                         int *retval);
3487 extern int ext4_inline_data_fiemap(struct inode *inode,
3488                                    struct fiemap_extent_info *fieinfo,
3489                                    int *has_inline, __u64 start, __u64 len);
3490
3491 struct iomap;
3492 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3493
3494 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3495
3496 extern int ext4_convert_inline_data(struct inode *inode);
3497
3498 static inline int ext4_has_inline_data(struct inode *inode)
3499 {
3500         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3501                EXT4_I(inode)->i_inline_off;
3502 }
3503
3504 /* namei.c */
3505 extern const struct inode_operations ext4_dir_inode_operations;
3506 extern const struct inode_operations ext4_special_inode_operations;
3507 extern struct dentry *ext4_get_parent(struct dentry *child);
3508 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3509                                  struct ext4_dir_entry_2 *de,
3510                                  int blocksize, int csum_size,
3511                                  unsigned int parent_ino, int dotdot_real_len);
3512 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3513                                         unsigned int blocksize);
3514 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3515                                       struct buffer_head *bh);
3516 extern int ext4_ci_compare(const struct inode *parent,
3517                            const struct qstr *fname,
3518                            const struct qstr *entry, bool quick);
3519 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3520                          struct inode *inode);
3521 extern int __ext4_link(struct inode *dir, struct inode *inode,
3522                        struct dentry *dentry);
3523
3524 #define S_SHIFT 12
3525 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3526         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3527         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3528         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3529         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3530         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3531         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3532         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3533 };
3534
3535 static inline void ext4_set_de_type(struct super_block *sb,
3536                                 struct ext4_dir_entry_2 *de,
3537                                 umode_t mode) {
3538         if (ext4_has_feature_filetype(sb))
3539                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3540 }
3541
3542 /* readpages.c */
3543 extern int ext4_mpage_readpages(struct inode *inode,
3544                 struct readahead_control *rac, struct page *page);
3545 extern int __init ext4_init_post_read_processing(void);
3546 extern void ext4_exit_post_read_processing(void);
3547
3548 /* symlink.c */
3549 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3550 extern const struct inode_operations ext4_symlink_inode_operations;
3551 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3552
3553 /* sysfs.c */
3554 extern int ext4_register_sysfs(struct super_block *sb);
3555 extern void ext4_unregister_sysfs(struct super_block *sb);
3556 extern int __init ext4_init_sysfs(void);
3557 extern void ext4_exit_sysfs(void);
3558
3559 /* block_validity */
3560 extern void ext4_release_system_zone(struct super_block *sb);
3561 extern int ext4_setup_system_zone(struct super_block *sb);
3562 extern int __init ext4_init_system_zone(void);
3563 extern void ext4_exit_system_zone(void);
3564 extern int ext4_inode_block_valid(struct inode *inode,
3565                                   ext4_fsblk_t start_blk,
3566                                   unsigned int count);
3567 extern int ext4_check_blockref(const char *, unsigned int,
3568                                struct inode *, __le32 *, unsigned int);
3569
3570 /* extents.c */
3571 struct ext4_ext_path;
3572 struct ext4_extent;
3573
3574 /*
3575  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3576  * __le32.
3577  */
3578 #define EXT_MAX_BLOCKS  0xffffffff
3579
3580 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3581 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3582 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3583                                struct ext4_map_blocks *map, int flags);
3584 extern int ext4_ext_truncate(handle_t *, struct inode *);
3585 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3586                                  ext4_lblk_t end);
3587 extern void ext4_ext_init(struct super_block *);
3588 extern void ext4_ext_release(struct super_block *);
3589 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3590                           loff_t len);
3591 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3592                                           loff_t offset, ssize_t len);
3593 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3594                                              ext4_io_end_t *io_end);
3595 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3596                            struct ext4_map_blocks *map, int flags);
3597 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3598                                                    int num,
3599                                                    struct ext4_ext_path *path);
3600 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3601                                   struct ext4_ext_path **,
3602                                   struct ext4_extent *, int);
3603 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3604                                               struct ext4_ext_path **,
3605                                               int flags);
3606 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3607 extern int ext4_ext_check_inode(struct inode *inode);
3608 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3609 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3610                         __u64 start, __u64 len);
3611 extern int ext4_get_es_cache(struct inode *inode,
3612                              struct fiemap_extent_info *fieinfo,
3613                              __u64 start, __u64 len);
3614 extern int ext4_ext_precache(struct inode *inode);
3615 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3616                                 struct inode *inode2, ext4_lblk_t lblk1,
3617                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3618                              int mark_unwritten,int *err);
3619 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3620 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3621                                        int check_cred, int restart_cred,
3622                                        int revoke_cred);
3623 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3624 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3625 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3626                 int len, int unwritten, ext4_fsblk_t pblk);
3627 extern int ext4_ext_clear_bb(struct inode *inode);
3628
3629
3630 /* move_extent.c */
3631 extern void ext4_double_down_write_data_sem(struct inode *first,
3632                                             struct inode *second);
3633 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3634                                           struct inode *donor_inode);
3635 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3636                              __u64 start_orig, __u64 start_donor,
3637                              __u64 len, __u64 *moved_len);
3638
3639 /* page-io.c */
3640 extern int __init ext4_init_pageio(void);
3641 extern void ext4_exit_pageio(void);
3642 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3643 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3644 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3645 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3646 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3647                                 struct writeback_control *wbc);
3648 extern void ext4_end_io_rsv_work(struct work_struct *work);
3649 extern void ext4_io_submit(struct ext4_io_submit *io);
3650 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3651                                struct page *page,
3652                                int len,
3653                                bool keep_towrite);
3654 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3655 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3656
3657 /* mmp.c */
3658 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3659
3660 /* verity.c */
3661 extern const struct fsverity_operations ext4_verityops;
3662
3663 /*
3664  * Add new method to test whether block and inode bitmaps are properly
3665  * initialized. With uninit_bg reading the block from disk is not enough
3666  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3667  */
3668 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3669
3670 static inline int bitmap_uptodate(struct buffer_head *bh)
3671 {
3672         return (buffer_uptodate(bh) &&
3673                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3674 }
3675 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3676 {
3677         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3678 }
3679
3680 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3681
3682 /* For ioend & aio unwritten conversion wait queues */
3683 #define EXT4_WQ_HASH_SZ         37
3684 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3685                                             EXT4_WQ_HASH_SZ])
3686 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3687
3688 extern int ext4_resize_begin(struct super_block *sb);
3689 extern void ext4_resize_end(struct super_block *sb);
3690
3691 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3692                                               struct ext4_io_end *io_end)
3693 {
3694         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3695                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3696                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3697         }
3698 }
3699
3700 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3701 {
3702         struct inode *inode = io_end->inode;
3703
3704         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3705                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3706                 /* Wake up anyone waiting on unwritten extent conversion */
3707                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3708                         wake_up_all(ext4_ioend_wq(inode));
3709         }
3710 }
3711
3712 extern const struct iomap_ops ext4_iomap_ops;
3713 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3714 extern const struct iomap_ops ext4_iomap_report_ops;
3715
3716 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3717 {
3718         /*
3719          * If the buffer has the write error flag, we have failed
3720          * to write out data in the block.  In this  case, we don't
3721          * have to read the block because we may read the old data
3722          * successfully.
3723          */
3724         if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3725                 set_buffer_uptodate(bh);
3726         return buffer_uptodate(bh);
3727 }
3728
3729 #endif  /* __KERNEL__ */
3730
3731 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3732 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3733
3734 #endif  /* _EXT4_H */