fs/ext4/ext4.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ext4.h
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT4_H
  18 #define _EXT4_H
  19
  20 #include <linux/types.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/magic.h>
  23 #include <linux/jbd2.h>
  24 #include <linux/quota.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/rbtree.h>
  27 #include <linux/seqlock.h>
  28 #include <linux/mutex.h>
  29 #include <linux/timer.h>
  30 #include <linux/version.h>
  31 #include <linux/wait.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/blockgroup_lock.h>
  34 #include <linux/percpu_counter.h>
  35 #include <linux/ratelimit.h>
  36 #include <crypto/hash.h>
  37 #include <linux/falloc.h>
  38 #include <linux/percpu-rwsem.h>
  39 #ifdef __KERNEL__
  40 #include <linux/compat.h>
  41 #endif
  42
  43 #define __FS_HAS_ENCRYPTION IS_ENABLED(CONFIG_EXT4_FS_ENCRYPTION)
  44 #include <linux/fscrypt.h>
  45
  46 #include <linux/compiler.h>
  47
  48 /* Until this gets included into linux/compiler-gcc.h */
  49 #ifndef __nonstring
  50 #if defined(GCC_VERSION) && (GCC_VERSION >= 80000)
  51 #define __nonstring __attribute__((nonstring))
  52 #else
  53 #define __nonstring
  54 #endif
  55 #endif
  56
  57 /*
  58  * The fourth extended filesystem constants/structures
  59  */
  60
  61 /*
  62  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  63  * structures. these checks slow things down a lot
  64  */
  65 #define AGGRESSIVE_CHECK__
  66
  67 /*
  68  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  69  * bitmaps, maintains and uses them to check for double allocations
  70  */
  71 #define DOUBLE_CHECK__
  72
  73 /*
  74  * Define EXT4FS_DEBUG to produce debug messages
  75  */
  76 #undef EXT4FS_DEBUG
  77
  78 /*
  79  * Debug code
  80  */
  81 #ifdef EXT4FS_DEBUG
  82 #define ext4_debug(f, a...)                                             \
  83         do {                                                            \
  84                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  85                         __FILE__, __LINE__, __func__);                  \
  86                 printk(KERN_DEBUG f, ## a);                             \
  87         } while (0)
  88 #else
  89 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  90 #endif
  91
  92 /*
  93  * Turn on EXT_DEBUG to get lots of info about extents operations.
  94  */
  95 #define EXT_DEBUG__
  96 #ifdef EXT_DEBUG
  97 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  98 #else
  99 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
 100 #endif
 101
 102 /* data type for block offset of block group */
 103 typedef int ext4_grpblk_t;
 104
 105 /* data type for filesystem-wide blocks number */
 106 typedef unsigned long long ext4_fsblk_t;
 107
 108 /* data type for file logical block number */
 109 typedef __u32 ext4_lblk_t;
 110
 111 /* data type for block group number */
 112 typedef unsigned int ext4_group_t;
 113
 114 enum SHIFT_DIRECTION {
 115         SHIFT_LEFT = 0,
 116         SHIFT_RIGHT,
 117 };
 118
 119 /*
 120  * Flags used in mballoc's allocation_context flags field.
 121  *
 122  * Also used to show what's going on for debugging purposes when the
 123  * flag field is exported via the traceport interface
 124  */
 125
 126 /* prefer goal again. length */
 127 #define EXT4_MB_HINT_MERGE              0x0001
 128 /* blocks already reserved */
 129 #define EXT4_MB_HINT_RESERVED           0x0002
 130 /* metadata is being allocated */
 131 #define EXT4_MB_HINT_METADATA           0x0004
 132 /* first blocks in the file */
 133 #define EXT4_MB_HINT_FIRST              0x0008
 134 /* search for the best chunk */
 135 #define EXT4_MB_HINT_BEST               0x0010
 136 /* data is being allocated */
 137 #define EXT4_MB_HINT_DATA               0x0020
 138 /* don't preallocate (for tails) */
 139 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 140 /* allocate for locality group */
 141 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 142 /* allocate goal blocks or none */
 143 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 144 /* goal is meaningful */
 145 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 146 /* blocks already pre-reserved by delayed allocation */
 147 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 148 /* We are doing stream allocation */
 149 #define EXT4_MB_STREAM_ALLOC            0x0800
 150 /* Use reserved root blocks if needed */
 151 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 152 /* Use blocks from reserved pool */
 153 #define EXT4_MB_USE_RESERVED            0x2000
 154
 155 struct ext4_allocation_request {
 156         /* target inode for block we're allocating */
 157         struct inode *inode;
 158         /* how many blocks we want to allocate */
 159         unsigned int len;
 160         /* logical block in target inode */
 161         ext4_lblk_t logical;
 162         /* the closest logical allocated block to the left */
 163         ext4_lblk_t lleft;
 164         /* the closest logical allocated block to the right */
 165         ext4_lblk_t lright;
 166         /* phys. target (a hint) */
 167         ext4_fsblk_t goal;
 168         /* phys. block for the closest logical allocated block to the left */
 169         ext4_fsblk_t pleft;
 170         /* phys. block for the closest logical allocated block to the right */
 171         ext4_fsblk_t pright;
 172         /* flags. see above EXT4_MB_HINT_* */
 173         unsigned int flags;
 174 };
 175
 176 /*
 177  * Logical to physical block mapping, used by ext4_map_blocks()
 178  *
 179  * This structure is used to pass requests into ext4_map_blocks() as
 180  * well as to store the information returned by ext4_map_blocks().  It
 181  * takes less room on the stack than a struct buffer_head.
 182  */
 183 #define EXT4_MAP_NEW            (1 << BH_New)
 184 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 185 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 186 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 187 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 188                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 189
 190 struct ext4_map_blocks {
 191         ext4_fsblk_t m_pblk;
 192         ext4_lblk_t m_lblk;
 193         unsigned int m_len;
 194         unsigned int m_flags;
 195 };
 196
 197 /*
 198  * Block validity checking, system zone rbtree.
 199  */
 200 struct ext4_system_blocks {
 201         struct rb_root root;
 202         struct rcu_head rcu;
 203 };
 204
 205 /*
 206  * Flags for ext4_io_end->flags
 207  */
 208 #define EXT4_IO_END_UNWRITTEN   0x0001
 209
 210 /*
 211  * For converting unwritten extents on a work queue. 'handle' is used for
 212  * buffered writeback.
 213  */
 214 typedef struct ext4_io_end {
 215         struct list_head        list;           /* per-file finished IO list */
 216         handle_t                *handle;        /* handle reserved for extent
 217                                                  * conversion */
 218         struct inode            *inode;         /* file being written to */
 219         struct bio              *bio;           /* Linked list of completed
 220                                                  * bios covering the extent */
 221         unsigned int            flag;           /* unwritten or not */
 222         atomic_t                count;          /* reference counter */
 223         loff_t                  offset;         /* offset in the file */
 224         ssize_t                 size;           /* size of the extent */
 225 } ext4_io_end_t;
 226
 227 struct ext4_io_submit {
 228         struct writeback_control *io_wbc;
 229         struct bio              *io_bio;
 230         ext4_io_end_t           *io_end;
 231         sector_t                io_next_block;
 232 };
 233
 234 /*
 235  * Special inodes numbers
 236  */
 237 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 238 #define EXT4_ROOT_INO            2      /* Root inode */
 239 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 240 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 241 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 242 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 243 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 244 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 245
 246 /* First non-reserved inode for old ext4 filesystems */
 247 #define EXT4_GOOD_OLD_FIRST_INO 11
 248
 249 /*
 250  * Maximal count of links to a file
 251  */
 252 #define EXT4_LINK_MAX           65000
 253
 254 /*
 255  * Macro-instructions used to manage several block sizes
 256  */
 257 #define EXT4_MIN_BLOCK_SIZE             1024
 258 #define EXT4_MAX_BLOCK_SIZE             65536
 259 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 260 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 261 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 262 #ifdef __KERNEL__
 263 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 264 #else
 265 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 266 #endif
 267 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 268 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 269                                          EXT4_SB(s)->s_cluster_bits)
 270 #ifdef __KERNEL__
 271 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 272 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 273 #else
 274 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 275 #endif
 276 #ifdef __KERNEL__
 277 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 278 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 279 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 280 #else
 281 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 282                                  EXT4_GOOD_OLD_INODE_SIZE : \
 283                                  (s)->s_inode_size)
 284 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 285                                  EXT4_GOOD_OLD_FIRST_INO : \
 286                                  (s)->s_first_ino)
 287 #endif
 288 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 289 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 290         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 291                                                                   blkbits))
 292
 293 /* Translate a block number to a cluster number */
 294 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 295 /* Translate a cluster number to a block number */
 296 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 297 /* Translate # of blks to # of clusters */
 298 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 299                                  (sbi)->s_cluster_bits)
 300 /* Mask out the low bits to get the starting block of the cluster */
 301 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 302                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 303 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 304                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 305 /* Get the cluster offset */
 306 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 307                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 308 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 309                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 310
 311 /*
 312  * Structure of a blocks group descriptor
 313  */
 314 struct ext4_group_desc
 315 {
 316         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 317         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 318         __le32  bg_inode_table_lo;      /* Inodes table block */
 319         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 320         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 321         __le16  bg_used_dirs_count_lo;  /* Directories count */
 322         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 323         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 324         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 325         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 326         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 327         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 328         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 329         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 330         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 331         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 332         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 333         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 334         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 335         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 336         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 337         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 338         __u32   bg_reserved;
 339 };
 340
 341 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 342         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 343          sizeof(__le16))
 344 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 345         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 346          sizeof(__le16))
 347
 348 /*
 349  * Structure of a flex block group info
 350  */
 351
 352 struct flex_groups {
 353         atomic64_t      free_clusters;
 354         atomic_t        free_inodes;
 355         atomic_t        used_dirs;
 356 };
 357
 358 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 359 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 360 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 361
 362 /*
 363  * Macro-instructions used to manage group descriptors
 364  */
 365 #define EXT4_MIN_DESC_SIZE              32
 366 #define EXT4_MIN_DESC_SIZE_64BIT        64
 367 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 368 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 369 #ifdef __KERNEL__
 370 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 371 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 372 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 373 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 374 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 375 #else
 376 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 377 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 378 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 379 #endif
 380
 381 /*
 382  * Constants relative to the data blocks
 383  */
 384 #define EXT4_NDIR_BLOCKS                12
 385 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 386 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 387 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 388 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 389
 390 /*
 391  * Inode flags
 392  */
 393 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 394 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 395 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 396 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 397 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 398 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 399 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 400 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 401 /* Reserved for compression usage... */
 402 #define EXT4_DIRTY_FL                   0x00000100
 403 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 404 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 405         /* nb: was previously EXT2_ECOMPR_FL */
 406 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 407 /* End compression flags --- maybe not all used */
 408 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 409 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 410 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 411 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 412 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 413 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 414 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 415 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 416 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 417 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 418 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 419 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 420 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 421
 422 #define EXT4_FL_USER_VISIBLE            0x304BDFFF /* User visible flags */
 423 #define EXT4_FL_USER_MODIFIABLE         0x204BC0FF /* User modifiable flags */
 424
 425 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 426 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 427                                          EXT4_IMMUTABLE_FL | \
 428                                          EXT4_APPEND_FL | \
 429                                          EXT4_NODUMP_FL | \
 430                                          EXT4_NOATIME_FL | \
 431                                          EXT4_PROJINHERIT_FL)
 432
 433 /* Flags that should be inherited by new inodes from their parent. */
 434 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 435                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 436                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 437                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 438                            EXT4_PROJINHERIT_FL)
 439
 440 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 441 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 442
 443 /* Flags that are appropriate for non-directories/regular files. */
 444 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 445
 446 /* The only flags that should be swapped */
 447 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 448
 449 /* Mask out flags that are inappropriate for the given type of inode. */
 450 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 451 {
 452         if (S_ISDIR(mode))
 453                 return flags;
 454         else if (S_ISREG(mode))
 455                 return flags & EXT4_REG_FLMASK;
 456         else
 457                 return flags & EXT4_OTHER_FLMASK;
 458 }
 459
 460 /*
 461  * Inode flags used for atomic set/get
 462  */
 463 enum {
 464         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 465         EXT4_INODE_UNRM         = 1,    /* Undelete */
 466         EXT4_INODE_COMPR        = 2,    /* Compress file */
 467         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 468         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 469         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 470         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 471         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 472 /* Reserved for compression usage... */
 473         EXT4_INODE_DIRTY        = 8,
 474         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 475         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 476         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 477 /* End compression flags --- maybe not all used */
 478         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 479         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 480         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 481         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 482         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 483         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 484         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 485         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 486         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 487         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 488         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 489         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 490         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 491 };
 492
 493 /*
 494  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 495  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 496  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 497  * any extra space in the compiled kernel image, otherwise, the build will fail.
 498  * It's important that these values are the same, since we are using
 499  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 500  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 501  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 502  * defined in e2fsprogs.
 503  *
 504  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 505  */
 506 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
 507 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 508
 509 static inline void ext4_check_flag_values(void)
 510 {
 511         CHECK_FLAG_VALUE(SECRM);
 512         CHECK_FLAG_VALUE(UNRM);
 513         CHECK_FLAG_VALUE(COMPR);
 514         CHECK_FLAG_VALUE(SYNC);
 515         CHECK_FLAG_VALUE(IMMUTABLE);
 516         CHECK_FLAG_VALUE(APPEND);
 517         CHECK_FLAG_VALUE(NODUMP);
 518         CHECK_FLAG_VALUE(NOATIME);
 519         CHECK_FLAG_VALUE(DIRTY);
 520         CHECK_FLAG_VALUE(COMPRBLK);
 521         CHECK_FLAG_VALUE(NOCOMPR);
 522         CHECK_FLAG_VALUE(ENCRYPT);
 523         CHECK_FLAG_VALUE(INDEX);
 524         CHECK_FLAG_VALUE(IMAGIC);
 525         CHECK_FLAG_VALUE(JOURNAL_DATA);
 526         CHECK_FLAG_VALUE(NOTAIL);
 527         CHECK_FLAG_VALUE(DIRSYNC);
 528         CHECK_FLAG_VALUE(TOPDIR);
 529         CHECK_FLAG_VALUE(HUGE_FILE);
 530         CHECK_FLAG_VALUE(EXTENTS);
 531         CHECK_FLAG_VALUE(EA_INODE);
 532         CHECK_FLAG_VALUE(EOFBLOCKS);
 533         CHECK_FLAG_VALUE(INLINE_DATA);
 534         CHECK_FLAG_VALUE(PROJINHERIT);
 535         CHECK_FLAG_VALUE(RESERVED);
 536 }
 537
 538 /* Used to pass group descriptor data when online resize is done */
 539 struct ext4_new_group_input {
 540         __u32 group;            /* Group number for this data */
 541         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 542         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 543         __u64 inode_table;      /* Absolute block number of inode table start */
 544         __u32 blocks_count;     /* Total number of blocks in this group */
 545         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 546         __u16 unused;
 547 };
 548
 549 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 550 struct compat_ext4_new_group_input {
 551         u32 group;
 552         compat_u64 block_bitmap;
 553         compat_u64 inode_bitmap;
 554         compat_u64 inode_table;
 555         u32 blocks_count;
 556         u16 reserved_blocks;
 557         u16 unused;
 558 };
 559 #endif
 560
 561 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 562 struct ext4_new_group_data {
 563         __u32 group;
 564         __u64 block_bitmap;
 565         __u64 inode_bitmap;
 566         __u64 inode_table;
 567         __u32 blocks_count;
 568         __u16 reserved_blocks;
 569         __u16 mdata_blocks;
 570         __u32 free_clusters_count;
 571 };
 572
 573 /* Indexes used to index group tables in ext4_new_group_data */
 574 enum {
 575         BLOCK_BITMAP = 0,       /* block bitmap */
 576         INODE_BITMAP,           /* inode bitmap */
 577         INODE_TABLE,            /* inode tables */
 578         GROUP_TABLE_COUNT,
 579 };
 580
 581 /*
 582  * Flags used by ext4_map_blocks()
 583  */
 584         /* Allocate any needed blocks and/or convert an unwritten
 585            extent to be an initialized ext4 */
 586 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 587         /* Request the creation of an unwritten extent */
 588 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 589 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 590                                                  EXT4_GET_BLOCKS_CREATE)
 591         /* Caller is from the delayed allocation writeout path
 592          * finally doing the actual allocation of delayed blocks */
 593 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 594         /* caller is from the direct IO path, request to creation of an
 595         unwritten extents if not allocated, split the unwritten
 596         extent if blocks has been preallocated already*/
 597 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 598 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 599 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 600                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 601         /* Convert extent to initialized after IO complete */
 602 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 603                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 604         /* Eventual metadata allocation (due to growing extent tree)
 605          * should not fail, so try to use reserved blocks for that.*/
 606 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 607         /* Don't normalize allocation size (used for fallocate) */
 608 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 609         /* Request will not result in inode size update (user for fallocate) */
 610 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 611         /* Convert written extents to unwritten */
 612 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 613         /* Write zeros to newly created written extents */
 614 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 615 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 616                                         EXT4_GET_BLOCKS_ZERO)
 617         /* Caller will submit data before dropping transaction handle. This
 618          * allows jbd2 to avoid submitting data before commit. */
 619 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 620
 621 /*
 622  * The bit position of these flags must not overlap with any of the
 623  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 624  * read_extent_tree_block(), ext4_split_extent_at(),
 625  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 626  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 627  * caching the extents when reading from the extent tree while a
 628  * truncate or punch hole operation is in progress.
 629  */
 630 #define EXT4_EX_NOCACHE                         0x40000000
 631 #define EXT4_EX_FORCE_CACHE                     0x20000000
 632
 633 /*
 634  * Flags used by ext4_free_blocks
 635  */
 636 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 637 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 638 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 639 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 640 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 641 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 642
 643 /*
 644  * ioctl commands
 645  */
 646 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 647 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 648 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 649 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 650 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 651 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 652 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 653 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 654 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 655 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 656 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 657  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 658  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 659 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 660 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 661 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 662 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 663 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 664 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 665 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 666 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 667
 668 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 669 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 670
 671 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 672
 673 /*
 674  * Flags for going down operation
 675  */
 676 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 677 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 678 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 679
 680
 681 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 682 /*
 683  * ioctl commands in 32 bit emulation
 684  */
 685 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 686 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 687 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 688 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 689 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 690 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 691 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 692 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 693 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 694 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 695 #endif
 696
 697 /* Max physical block we can address w/o extents */
 698 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 699
 700 /* Max logical block we can support */
 701 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
 702
 703 /*
 704  * Structure of an inode on the disk
 705  */
 706 struct ext4_inode {
 707         __le16  i_mode;         /* File mode */
 708         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 709         __le32  i_size_lo;      /* Size in bytes */
 710         __le32  i_atime;        /* Access time */
 711         __le32  i_ctime;        /* Inode Change time */
 712         __le32  i_mtime;        /* Modification time */
 713         __le32  i_dtime;        /* Deletion Time */
 714         __le16  i_gid;          /* Low 16 bits of Group Id */
 715         __le16  i_links_count;  /* Links count */
 716         __le32  i_blocks_lo;    /* Blocks count */
 717         __le32  i_flags;        /* File flags */
 718         union {
 719                 struct {
 720                         __le32  l_i_version;
 721                 } linux1;
 722                 struct {
 723                         __u32  h_i_translator;
 724                 } hurd1;
 725                 struct {
 726                         __u32  m_i_reserved1;
 727                 } masix1;
 728         } osd1;                         /* OS dependent 1 */
 729         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 730         __le32  i_generation;   /* File version (for NFS) */
 731         __le32  i_file_acl_lo;  /* File ACL */
 732         __le32  i_size_high;
 733         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 734         union {
 735                 struct {
 736                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 737                         __le16  l_i_file_acl_high;
 738                         __le16  l_i_uid_high;   /* these 2 fields */
 739                         __le16  l_i_gid_high;   /* were reserved2[0] */
 740                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 741                         __le16  l_i_reserved;
 742                 } linux2;
 743                 struct {
 744                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 745                         __u16   h_i_mode_high;
 746                         __u16   h_i_uid_high;
 747                         __u16   h_i_gid_high;
 748                         __u32   h_i_author;
 749                 } hurd2;
 750                 struct {
 751                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 752                         __le16  m_i_file_acl_high;
 753                         __u32   m_i_reserved2[2];
 754                 } masix2;
 755         } osd2;                         /* OS dependent 2 */
 756         __le16  i_extra_isize;
 757         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 758         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 759         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 760         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 761         __le32  i_crtime;       /* File Creation time */
 762         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 763         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 764         __le32  i_projid;       /* Project ID */
 765 };
 766
 767 struct move_extent {
 768         __u32 reserved;         /* should be zero */
 769         __u32 donor_fd;         /* donor file descriptor */
 770         __u64 orig_start;       /* logical start offset in block for orig */
 771         __u64 donor_start;      /* logical start offset in block for donor */
 772         __u64 len;              /* block length to be moved */
 773         __u64 moved_len;        /* moved block length */
 774 };
 775
 776 #define EXT4_EPOCH_BITS 2
 777 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 778 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 779
 780 /*
 781  * Extended fields will fit into an inode if the filesystem was formatted
 782  * with large inodes (-I 256 or larger) and there are not currently any EAs
 783  * consuming all of the available space. For new inodes we always reserve
 784  * enough space for the kernel's known extended fields, but for inodes
 785  * created with an old kernel this might not have been the case. None of
 786  * the extended inode fields is critical for correct filesystem operation.
 787  * This macro checks if a certain field fits in the inode. Note that
 788  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 789  */
 790 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 791         ((offsetof(typeof(*ext4_inode), field) +        \
 792           sizeof((ext4_inode)->field))                  \
 793         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 794             (einode)->i_extra_isize))                   \
 795
 796 /*
 797  * We use an encoding that preserves the times for extra epoch "00":
 798  *
 799  * extra  msb of                         adjust for signed
 800  * epoch  32-bit                         32-bit tv_sec to
 801  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 802  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 803  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 804  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 805  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 806  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 807  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 808  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 809  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 810  *
 811  * Note that previous versions of the kernel on 64-bit systems would
 812  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 813  * 1970.  e2fsck will correct this, assuming that it is run on the
 814  * affected filesystem before 2242.
 815  */
 816
 817 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 818 {
 819         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 820         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 821 }
 822
 823 static inline void ext4_decode_extra_time(struct timespec64 *time,
 824                                           __le32 extra)
 825 {
 826         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
 827
 828 #if 1
 829                 /* Handle legacy encoding of pre-1970 dates with epoch
 830                  * bits 1,1. (This backwards compatibility may be removed
 831                  * at the discretion of the ext4 developers.)
 832                  */
 833                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
 834                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
 835                         extra_bits = 0;
 836                 time->tv_sec += extra_bits << 32;
 837 #else
 838                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 839 #endif
 840         }
 841         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 842 }
 843
 844 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 845 do {                                                                            \
 846         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);                \
 847         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 848                 (raw_inode)->xtime ## _extra =                                  \
 849                                 ext4_encode_extra_time(&(inode)->xtime);        \
 850                 }                                                               \
 851 } while (0)
 852
 853 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 854 do {                                                                           \
 855         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 856                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 857         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 858                 (raw_inode)->xtime ## _extra =                                 \
 859                                 ext4_encode_extra_time(&(einode)->xtime);      \
 860 } while (0)
 861
 862 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 863 do {                                                                            \
 864         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 865         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 866                 ext4_decode_extra_time(&(inode)->xtime,                         \
 867                                        raw_inode->xtime ## _extra);             \
 868                 }                                                               \
 869         else                                                                    \
 870                 (inode)->xtime.tv_nsec = 0;                                     \
 871 } while (0)
 872
 873
 874 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 875 do {                                                                           \
 876         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 877                 (einode)->xtime.tv_sec =                                       \
 878                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 879         else                                                                   \
 880                 (einode)->xtime.tv_sec = 0;                                    \
 881         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 882                 ext4_decode_extra_time(&(einode)->xtime,                       \
 883                                        raw_inode->xtime ## _extra);            \
 884         else                                                                   \
 885                 (einode)->xtime.tv_nsec = 0;                                   \
 886 } while (0)
 887
 888 #define i_disk_version osd1.linux1.l_i_version
 889
 890 #if defined(__KERNEL__) || defined(__linux__)
 891 #define i_reserved1     osd1.linux1.l_i_reserved1
 892 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 893 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 894 #define i_uid_low       i_uid
 895 #define i_gid_low       i_gid
 896 #define i_uid_high      osd2.linux2.l_i_uid_high
 897 #define i_gid_high      osd2.linux2.l_i_gid_high
 898 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 899
 900 #elif defined(__GNU__)
 901
 902 #define i_translator    osd1.hurd1.h_i_translator
 903 #define i_uid_high      osd2.hurd2.h_i_uid_high
 904 #define i_gid_high      osd2.hurd2.h_i_gid_high
 905 #define i_author        osd2.hurd2.h_i_author
 906
 907 #elif defined(__masix__)
 908
 909 #define i_reserved1     osd1.masix1.m_i_reserved1
 910 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 911 #define i_reserved2     osd2.masix2.m_i_reserved2
 912
 913 #endif /* defined(__KERNEL__) || defined(__linux__) */
 914
 915 #include "extents_status.h"
 916
 917 /*
 918  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 919  *
 920  * These are needed to avoid lockdep false positives when we need to
 921  * allocate blocks to the quota inode during ext4_map_blocks(), while
 922  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 923  * do quota tracking for the quota inode, this avoids deadlock (as
 924  * well as infinite recursion, since it isn't turtles all the way
 925  * down...)
 926  *
 927  *  I_DATA_SEM_NORMAL - Used for most inodes
 928  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 929  *                        where the second inode has larger inode number
 930  *                        than the first
 931  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 932  *  I_DATA_SEM_EA     - Used for ea_inodes only
 933  */
 934 enum {
 935         I_DATA_SEM_NORMAL = 0,
 936         I_DATA_SEM_OTHER,
 937         I_DATA_SEM_QUOTA,
 938         I_DATA_SEM_EA
 939 };
 940
 941
 942 /*
 943  * fourth extended file system inode data in memory
 944  */
 945 struct ext4_inode_info {
 946         __le32  i_data[15];     /* unconverted */
 947         __u32   i_dtime;
 948         ext4_fsblk_t    i_file_acl;
 949
 950         /*
 951          * i_block_group is the number of the block group which contains
 952          * this file's inode.  Constant across the lifetime of the inode,
 953          * it is used for making block allocation decisions - we try to
 954          * place a file's data blocks near its inode block, and new inodes
 955          * near to their parent directory's inode.
 956          */
 957         ext4_group_t    i_block_group;
 958         ext4_lblk_t     i_dir_start_lookup;
 959 #if (BITS_PER_LONG < 64)
 960         unsigned long   i_state_flags;          /* Dynamic state flags */
 961 #endif
 962         unsigned long   i_flags;
 963
 964         /*
 965          * Extended attributes can be read independently of the main file
 966          * data. Taking i_mutex even when reading would cause contention
 967          * between readers of EAs and writers of regular file data, so
 968          * instead we synchronize on xattr_sem when reading or changing
 969          * EAs.
 970          */
 971         struct rw_semaphore xattr_sem;
 972
 973         struct list_head i_orphan;      /* unlinked but open inodes */
 974
 975         /*
 976          * i_disksize keeps track of what the inode size is ON DISK, not
 977          * in memory.  During truncate, i_size is set to the new size by
 978          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 979          * set i_disksize to 0 until the truncate is actually under way.
 980          *
 981          * The intent is that i_disksize always represents the blocks which
 982          * are used by this file.  This allows recovery to restart truncate
 983          * on orphans if we crash during truncate.  We actually write i_disksize
 984          * into the on-disk inode when writing inodes out, instead of i_size.
 985          *
 986          * The only time when i_disksize and i_size may be different is when
 987          * a truncate is in progress.  The only things which change i_disksize
 988          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 989          */
 990         loff_t  i_disksize;
 991
 992         /*
 993          * i_data_sem is for serialising ext4_truncate() against
 994          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 995          * data tree are chopped off during truncate. We can't do that in
 996          * ext4 because whenever we perform intermediate commits during
 997          * truncate, the inode and all the metadata blocks *must* be in a
 998          * consistent state which allows truncation of the orphans to restart
 999          * during recovery.  Hence we must fix the get_block-vs-truncate race
1000          * by other means, so we have i_data_sem.
1001          */
1002         struct rw_semaphore i_data_sem;
1003         /*
1004          * i_mmap_sem is for serializing page faults with truncate / punch hole
1005          * operations. We have to make sure that new page cannot be faulted in
1006          * a section of the inode that is being punched. We cannot easily use
1007          * i_data_sem for this since we need protection for the whole punch
1008          * operation and i_data_sem ranks below transaction start so we have
1009          * to occasionally drop it.
1010          */
1011         struct rw_semaphore i_mmap_sem;
1012         struct inode vfs_inode;
1013         struct jbd2_inode *jinode;
1014
1015         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1016
1017         /*
1018          * File creation time. Its function is same as that of
1019          * struct timespec64 i_{a,c,m}time in the generic inode.
1020          */
1021         struct timespec64 i_crtime;
1022
1023         /* mballoc */
1024         struct list_head i_prealloc_list;
1025         spinlock_t i_prealloc_lock;
1026
1027         /* extents status tree */
1028         struct ext4_es_tree i_es_tree;
1029         rwlock_t i_es_lock;
1030         struct list_head i_es_list;
1031         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1032         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1033         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1034                                            extents to shrink. Protected by
1035                                            i_es_lock  */
1036
1037         /* ialloc */
1038         ext4_group_t    i_last_alloc_group;
1039
1040         /* allocation reservation info for delalloc */
1041         /* In case of bigalloc, this refer to clusters rather than blocks */
1042         unsigned int i_reserved_data_blocks;
1043         ext4_lblk_t i_da_metadata_calc_last_lblock;
1044         int i_da_metadata_calc_len;
1045
1046         /* on-disk additional length */
1047         __u16 i_extra_isize;
1048
1049         /* Indicate the inline data space. */
1050         u16 i_inline_off;
1051         u16 i_inline_size;
1052
1053 #ifdef CONFIG_QUOTA
1054         /* quota space reservation, managed internally by quota code */
1055         qsize_t i_reserved_quota;
1056 #endif
1057
1058         /* Lock protecting lists below */
1059         spinlock_t i_completed_io_lock;
1060         /*
1061          * Completed IOs that need unwritten extents handling and have
1062          * transaction reserved
1063          */
1064         struct list_head i_rsv_conversion_list;
1065         struct work_struct i_rsv_conversion_work;
1066         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1067
1068         spinlock_t i_block_reservation_lock;
1069
1070         /*
1071          * Transactions that contain inode's metadata needed to complete
1072          * fsync and fdatasync, respectively.
1073          */
1074         tid_t i_sync_tid;
1075         tid_t i_datasync_tid;
1076
1077 #ifdef CONFIG_QUOTA
1078         struct dquot *i_dquot[MAXQUOTAS];
1079 #endif
1080
1081         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1082         __u32 i_csum_seed;
1083
1084         kprojid_t i_projid;
1085 };
1086
1087 /*
1088  * File system states
1089  */
1090 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1091 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1092 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1093
1094 /*
1095  * Misc. filesystem flags
1096  */
1097 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1098 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1099 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1100
1101 /*
1102  * Mount flags set via mount options or defaults
1103  */
1104 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1105 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1106 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1107 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1108 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1109 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1110 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1111 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1112 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1113 #ifdef CONFIG_FS_DAX
1114 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1115 #else
1116 #define EXT4_MOUNT_DAX                  0
1117 #endif
1118 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1119 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1120 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1121 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1122 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1123 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1124 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1125 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1126 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1127 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1128 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1129 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1130                                                  * enable enforcement for hidden
1131                                                  * quota files */
1132 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1133                                                   * enforcement for hidden quota
1134                                                   * files */
1135 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1136                                                   * enforcement */
1137 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1138 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1139 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1140 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1141 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1142 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1143 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1144 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1145 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1146
1147 /*
1148  * Mount flags set either automatically (could not be set by mount option)
1149  * based on per file system feature or property or in special cases such as
1150  * distinguishing between explicit mount option definition and default.
1151  */
1152 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1153                                                       specified delalloc */
1154 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1155                                                       size of blocksize * 8
1156                                                       blocks */
1157 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1158                                                       file systems */
1159
1160 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1161                                                 specified journal checksum */
1162
1163 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1164                                                 ~EXT4_MOUNT_##opt
1165 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1166                                                 EXT4_MOUNT_##opt
1167 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1168                                          EXT4_MOUNT_##opt)
1169
1170 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1171                                                 ~EXT4_MOUNT2_##opt
1172 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1173                                                 EXT4_MOUNT2_##opt
1174 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1175                                          EXT4_MOUNT2_##opt)
1176
1177 #define ext4_test_and_set_bit           __test_and_set_bit_le
1178 #define ext4_set_bit                    __set_bit_le
1179 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1180 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1181 #define ext4_clear_bit                  __clear_bit_le
1182 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1183 #define ext4_test_bit                   test_bit_le
1184 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1185 #define ext4_find_next_bit              find_next_bit_le
1186
1187 extern void ext4_set_bits(void *bm, int cur, int len);
1188
1189 /*
1190  * Maximal mount counts between two filesystem checks
1191  */
1192 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1193 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1194
1195 /*
1196  * Behaviour when detecting errors
1197  */
1198 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1199 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1200 #define EXT4_ERRORS_PANIC               3       /* Panic */
1201 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1202
1203 /* Metadata checksum algorithm codes */
1204 #define EXT4_CRC32C_CHKSUM              1
1205
1206 /*
1207  * Structure of the super block
1208  */
1209 struct ext4_super_block {
1210 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1211         __le32  s_blocks_count_lo;      /* Blocks count */
1212         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1213         __le32  s_free_blocks_count_lo; /* Free blocks count */
1214 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1215         __le32  s_first_data_block;     /* First Data Block */
1216         __le32  s_log_block_size;       /* Block size */
1217         __le32  s_log_cluster_size;     /* Allocation cluster size */
1218 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1219         __le32  s_clusters_per_group;   /* # Clusters per group */
1220         __le32  s_inodes_per_group;     /* # Inodes per group */
1221         __le32  s_mtime;                /* Mount time */
1222 /*30*/  __le32  s_wtime;                /* Write time */
1223         __le16  s_mnt_count;            /* Mount count */
1224         __le16  s_max_mnt_count;        /* Maximal mount count */
1225         __le16  s_magic;                /* Magic signature */
1226         __le16  s_state;                /* File system state */
1227         __le16  s_errors;               /* Behaviour when detecting errors */
1228         __le16  s_minor_rev_level;      /* minor revision level */
1229 /*40*/  __le32  s_lastcheck;            /* time of last check */
1230         __le32  s_checkinterval;        /* max. time between checks */
1231         __le32  s_creator_os;           /* OS */
1232         __le32  s_rev_level;            /* Revision level */
1233 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1234         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1235         /*
1236          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1237          *
1238          * Note: the difference between the compatible feature set and
1239          * the incompatible feature set is that if there is a bit set
1240          * in the incompatible feature set that the kernel doesn't
1241          * know about, it should refuse to mount the filesystem.
1242          *
1243          * e2fsck's requirements are more strict; if it doesn't know
1244          * about a feature in either the compatible or incompatible
1245          * feature set, it must abort and not try to meddle with
1246          * things it doesn't understand...
1247          */
1248         __le32  s_first_ino;            /* First non-reserved inode */
1249         __le16  s_inode_size;           /* size of inode structure */
1250         __le16  s_block_group_nr;       /* block group # of this superblock */
1251         __le32  s_feature_compat;       /* compatible feature set */
1252 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1253         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1254 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1255 /*78*/  char    s_volume_name[16];      /* volume name */
1256 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1257 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1258         /*
1259          * Performance hints.  Directory preallocation should only
1260          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1261          */
1262         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1263         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1264         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1265         /*
1266          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1267          */
1268 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1269 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1270         __le32  s_journal_dev;          /* device number of journal file */
1271         __le32  s_last_orphan;          /* start of list of inodes to delete */
1272         __le32  s_hash_seed[4];         /* HTREE hash seed */
1273         __u8    s_def_hash_version;     /* Default hash version to use */
1274         __u8    s_jnl_backup_type;
1275         __le16  s_desc_size;            /* size of group descriptor */
1276 /*100*/ __le32  s_default_mount_opts;
1277         __le32  s_first_meta_bg;        /* First metablock block group */
1278         __le32  s_mkfs_time;            /* When the filesystem was created */
1279         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1280         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1281 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1282         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1283         __le32  s_free_blocks_count_hi; /* Free blocks count */
1284         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1285         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1286         __le32  s_flags;                /* Miscellaneous flags */
1287         __le16  s_raid_stride;          /* RAID stride */
1288         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1289         __le64  s_mmp_block;            /* Block for multi-mount protection */
1290         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1291         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1292         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1293         __u8    s_encryption_level;     /* versioning level for encryption */
1294         __u8    s_reserved_pad;         /* Padding to next 32bits */
1295         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1296         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1297         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1298         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1299                                               snapshot's future use */
1300         __le32  s_snapshot_list;        /* inode number of the head of the
1301                                            on-disk snapshot list */
1302 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1303         __le32  s_error_count;          /* number of fs errors */
1304         __le32  s_first_error_time;     /* first time an error happened */
1305         __le32  s_first_error_ino;      /* inode involved in first error */
1306         __le64  s_first_error_block;    /* block involved of first error */
1307         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1308         __le32  s_first_error_line;     /* line number where error happened */
1309         __le32  s_last_error_time;      /* most recent time of an error */
1310         __le32  s_last_error_ino;       /* inode involved in last error */
1311         __le32  s_last_error_line;      /* line number where error happened */
1312         __le64  s_last_error_block;     /* block involved of last error */
1313         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1314 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1315         __u8    s_mount_opts[64];
1316         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1317         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1318         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1319         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1320         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1321         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1322         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1323         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1324         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1325         __u8    s_wtime_hi;
1326         __u8    s_mtime_hi;
1327         __u8    s_mkfs_time_hi;
1328         __u8    s_lastcheck_hi;
1329         __u8    s_first_error_time_hi;
1330         __u8    s_last_error_time_hi;
1331         __u8    s_pad[2];
1332         __le32  s_reserved[96];         /* Padding to the end of the block */
1333         __le32  s_checksum;             /* crc32c(superblock) */
1334 };
1335
1336 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1337
1338 #ifdef __KERNEL__
1339
1340 /*
1341  * run-time mount flags
1342  */
1343 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1344 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1345 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1346
1347 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1348 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1349                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1350 #else
1351 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1352 #endif
1353
1354 /* Number of quota types we support */
1355 #define EXT4_MAXQUOTAS 3
1356
1357 /*
1358  * fourth extended-fs super-block data in memory
1359  */
1360 struct ext4_sb_info {
1361         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1362         unsigned long s_inodes_per_block;/* Number of inodes per block */
1363         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1364         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1365         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1366         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1367         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1368         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1369         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1370         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1371         unsigned long s_overhead;  /* # of fs overhead clusters */
1372         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1373         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1374         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1375         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1376         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1377         struct buffer_head * __rcu *s_group_desc;
1378         unsigned int s_mount_opt;
1379         unsigned int s_mount_opt2;
1380         unsigned int s_mount_flags;
1381         unsigned int s_def_mount_opt;
1382         ext4_fsblk_t s_sb_block;
1383         atomic64_t s_resv_clusters;
1384         kuid_t s_resuid;
1385         kgid_t s_resgid;
1386         unsigned short s_mount_state;
1387         unsigned short s_pad;
1388         int s_addr_per_block_bits;
1389         int s_desc_per_block_bits;
1390         int s_inode_size;
1391         int s_first_ino;
1392         unsigned int s_inode_readahead_blks;
1393         unsigned int s_inode_goal;
1394         u32 s_hash_seed[4];
1395         int s_def_hash_version;
1396         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1397         struct percpu_counter s_freeclusters_counter;
1398         struct percpu_counter s_freeinodes_counter;
1399         struct percpu_counter s_dirs_counter;
1400         struct percpu_counter s_dirtyclusters_counter;
1401         struct blockgroup_lock *s_blockgroup_lock;
1402         struct proc_dir_entry *s_proc;
1403         struct kobject s_kobj;
1404         struct completion s_kobj_unregister;
1405         struct super_block *s_sb;
1406
1407         /* Journaling */
1408         struct journal_s *s_journal;
1409         struct list_head s_orphan;
1410         struct mutex s_orphan_lock;
1411         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1412         unsigned long s_commit_interval;
1413         u32 s_max_batch_time;
1414         u32 s_min_batch_time;
1415         struct block_device *journal_bdev;
1416 #ifdef CONFIG_QUOTA
1417         /* Names of quota files with journalled quota */
1418         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1419         int s_jquota_fmt;                       /* Format of quota to use */
1420 #endif
1421         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1422         struct ext4_system_blocks __rcu *system_blks;
1423
1424 #ifdef EXTENTS_STATS
1425         /* ext4 extents stats */
1426         unsigned long s_ext_min;
1427         unsigned long s_ext_max;
1428         unsigned long s_depth_max;
1429         spinlock_t s_ext_stats_lock;
1430         unsigned long s_ext_blocks;
1431         unsigned long s_ext_extents;
1432 #endif
1433
1434         /* for buddy allocator */
1435         struct ext4_group_info ** __rcu *s_group_info;
1436         struct inode *s_buddy_cache;
1437         spinlock_t s_md_lock;
1438         unsigned short *s_mb_offsets;
1439         unsigned int *s_mb_maxs;
1440         unsigned int s_group_info_size;
1441         unsigned int s_mb_free_pending;
1442         struct list_head s_freed_data_list;     /* List of blocks to be freed
1443                                                    after commit completed */
1444
1445         /* tunables */
1446         unsigned long s_stripe;
1447         unsigned int s_mb_stream_request;
1448         unsigned int s_mb_max_to_scan;
1449         unsigned int s_mb_min_to_scan;
1450         unsigned int s_mb_stats;
1451         unsigned int s_mb_order2_reqs;
1452         unsigned int s_mb_group_prealloc;
1453         unsigned int s_max_dir_size_kb;
1454         /* where last allocation was done - for stream allocation */
1455         unsigned long s_mb_last_group;
1456         unsigned long s_mb_last_start;
1457
1458         /* stats for buddy allocator */
1459         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1460         atomic_t s_bal_success; /* we found long enough chunks */
1461         atomic_t s_bal_allocated;       /* in blocks */
1462         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1463         atomic_t s_bal_goals;   /* goal hits */
1464         atomic_t s_bal_breaks;  /* too long searches */
1465         atomic_t s_bal_2orders; /* 2^order hits */
1466         spinlock_t s_bal_lock;
1467         unsigned long s_mb_buddies_generated;
1468         unsigned long long s_mb_generation_time;
1469         atomic_t s_mb_lost_chunks;
1470         atomic_t s_mb_preallocated;
1471         atomic_t s_mb_discarded;
1472         atomic_t s_lock_busy;
1473
1474         /* locality groups */
1475         struct ext4_locality_group __percpu *s_locality_groups;
1476
1477         /* for write statistics */
1478         unsigned long s_sectors_written_start;
1479         u64 s_kbytes_written;
1480
1481         /* the size of zero-out chunk */
1482         unsigned int s_extent_max_zeroout_kb;
1483
1484         unsigned int s_log_groups_per_flex;
1485         struct flex_groups * __rcu *s_flex_groups;
1486         ext4_group_t s_flex_groups_allocated;
1487
1488         /* workqueue for reserved extent conversions (buffered io) */
1489         struct workqueue_struct *rsv_conversion_wq;
1490
1491         /* timer for periodic error stats printing */
1492         struct timer_list s_err_report;
1493
1494         /* Lazy inode table initialization info */
1495         struct ext4_li_request *s_li_request;
1496         /* Wait multiplier for lazy initialization thread */
1497         unsigned int s_li_wait_mult;
1498
1499         /* Kernel thread for multiple mount protection */
1500         struct task_struct *s_mmp_tsk;
1501
1502         /* record the last minlen when FITRIM is called. */
1503         atomic_t s_last_trim_minblks;
1504
1505         /* Reference to checksum algorithm driver via cryptoapi */
1506         struct crypto_shash *s_chksum_driver;
1507
1508         /* Precomputed FS UUID checksum for seeding other checksums */
1509         __u32 s_csum_seed;
1510
1511         /* Reclaim extents from extent status tree */
1512         struct shrinker s_es_shrinker;
1513         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1514         long s_es_nr_inode;
1515         struct ext4_es_stats s_es_stats;
1516         struct mb_cache *s_ea_block_cache;
1517         struct mb_cache *s_ea_inode_cache;
1518         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1519
1520         /* Ratelimit ext4 messages. */
1521         struct ratelimit_state s_err_ratelimit_state;
1522         struct ratelimit_state s_warning_ratelimit_state;
1523         struct ratelimit_state s_msg_ratelimit_state;
1524
1525         /*
1526          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1527          * or EXTENTS flag.
1528          */
1529         struct percpu_rw_semaphore s_writepages_rwsem;
1530         struct dax_device *s_daxdev;
1531 };
1532
1533 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1534 {
1535         return sb->s_fs_info;
1536 }
1537 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1538 {
1539         return container_of(inode, struct ext4_inode_info, vfs_inode);
1540 }
1541
1542 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1543 {
1544         return ino == EXT4_ROOT_INO ||
1545                 (ino >= EXT4_FIRST_INO(sb) &&
1546                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1547 }
1548
1549 /*
1550  * Returns: sbi->field[index]
1551  * Used to access an array element from the following sbi fields which require
1552  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1553  * - s_group_desc
1554  * - s_group_info
1555  * - s_flex_group
1556  */
1557 #define sbi_array_rcu_deref(sbi, field, index)                             \
1558 ({                                                                         \
1559         typeof(*((sbi)->field)) _v;                                        \
1560         rcu_read_lock();                                                   \
1561         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1562         rcu_read_unlock();                                                 \
1563         _v;                                                                \
1564 })
1565
1566 /*
1567  * Inode dynamic state flags
1568  */
1569 enum {
1570         EXT4_STATE_JDATA,               /* journaled data exists */
1571         EXT4_STATE_NEW,                 /* inode is newly created */
1572         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1573         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1574         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1575         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1576         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1577         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1578         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1579         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1580         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1581 };
1582
1583 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1584 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1585 {                                                                       \
1586         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1587 }                                                                       \
1588 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1589 {                                                                       \
1590         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1591 }                                                                       \
1592 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1593 {                                                                       \
1594         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1595 }
1596
1597 /* Add these declarations here only so that these functions can be
1598  * found by name.  Otherwise, they are very hard to locate. */
1599 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1600 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1601 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1602 EXT4_INODE_BIT_FNS(flag, flags, 0)
1603
1604 /* Add these declarations here only so that these functions can be
1605  * found by name.  Otherwise, they are very hard to locate. */
1606 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1607 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1608 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1609 #if (BITS_PER_LONG < 64)
1610 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1611
1612 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1613 {
1614         (ei)->i_state_flags = 0;
1615 }
1616 #else
1617 EXT4_INODE_BIT_FNS(state, flags, 32)
1618
1619 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1620 {
1621         /* We depend on the fact that callers will set i_flags */
1622 }
1623 #endif
1624 #else
1625 /* Assume that user mode programs are passing in an ext4fs superblock, not
1626  * a kernel struct super_block.  This will allow us to call the feature-test
1627  * macros from user land. */
1628 #define EXT4_SB(sb)     (sb)
1629 #endif
1630
1631 /*
1632  * Returns true if the inode is inode is encrypted
1633  */
1634 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1635
1636 /*
1637  * Codes for operating systems
1638  */
1639 #define EXT4_OS_LINUX           0
1640 #define EXT4_OS_HURD            1
1641 #define EXT4_OS_MASIX           2
1642 #define EXT4_OS_FREEBSD         3
1643 #define EXT4_OS_LITES           4
1644
1645 /*
1646  * Revision levels
1647  */
1648 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1649 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1650
1651 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1652 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1653
1654 #define EXT4_GOOD_OLD_INODE_SIZE 128
1655
1656 /*
1657  * Feature set definitions
1658  */
1659
1660 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1661 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1662 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1663 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1664 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1665 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1666 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1667
1668 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1669 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1670 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1671 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1672 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1673 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1674 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1675 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1676 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1677 /*
1678  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1679  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1680  * all other data structures' checksums.  However, the METADATA_CSUM and
1681  * GDT_CSUM bits are mutually exclusive.
1682  */
1683 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1684 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1685 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1686
1687 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1688 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1689 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1690 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1691 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1692 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1693 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1694 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1695 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1696 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1697 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1698 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1699 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1700 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1701 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1702
1703 extern void ext4_update_dynamic_rev(struct super_block *sb);
1704
1705 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1706 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1707 { \
1708         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1709                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1710 } \
1711 static inline void ext4_set_feature_##name(struct super_block *sb) \
1712 { \
1713         ext4_update_dynamic_rev(sb); \
1714         EXT4_SB(sb)->s_es->s_feature_compat |= \
1715                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1716 } \
1717 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1718 { \
1719         EXT4_SB(sb)->s_es->s_feature_compat &= \
1720                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1721 }
1722
1723 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1724 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1725 { \
1726         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1727                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1728 } \
1729 static inline void ext4_set_feature_##name(struct super_block *sb) \
1730 { \
1731         ext4_update_dynamic_rev(sb); \
1732         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1733                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1734 } \
1735 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1736 { \
1737         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1738                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1739 }
1740
1741 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1742 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1743 { \
1744         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1745                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1746 } \
1747 static inline void ext4_set_feature_##name(struct super_block *sb) \
1748 { \
1749         ext4_update_dynamic_rev(sb); \
1750         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1751                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1752 } \
1753 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1754 { \
1755         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1756                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1757 }
1758
1759 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1760 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1761 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1762 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1763 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1764 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1765 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1766
1767 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1768 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1769 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1770 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1771 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1772 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1773 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1774 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1775 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1776 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1777 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1778 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1779
1780 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1781 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1782 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1783 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1784 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1785 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1786 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1787 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1788 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1789 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1790 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1791 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1792 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1793 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1794 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1795
1796 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1797 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1798                                          EXT4_FEATURE_INCOMPAT_META_BG)
1799 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1800                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1801                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1802
1803 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1804 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1805                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1806                                          EXT4_FEATURE_INCOMPAT_META_BG)
1807 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1808                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1809                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1810
1811 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1812 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1813                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1814                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1815                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1816                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1817                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1818                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1819                                          EXT4_FEATURE_INCOMPAT_MMP | \
1820                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1821                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1822                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1823                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1824 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1825                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1826                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1827                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1828                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1829                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1830                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1831                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1832                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1833                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1834                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1835
1836 #define EXTN_FEATURE_FUNCS(ver) \
1837 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1838 { \
1839         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1840                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1841 } \
1842 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1843 { \
1844         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1845                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1846 } \
1847 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1848 { \
1849         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1850                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1851 }
1852
1853 EXTN_FEATURE_FUNCS(2)
1854 EXTN_FEATURE_FUNCS(3)
1855 EXTN_FEATURE_FUNCS(4)
1856
1857 static inline bool ext4_has_compat_features(struct super_block *sb)
1858 {
1859         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1860 }
1861 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1862 {
1863         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1864 }
1865 static inline bool ext4_has_incompat_features(struct super_block *sb)
1866 {
1867         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1868 }
1869
1870 /*
1871  * Superblock flags
1872  */
1873 #define EXT4_FLAGS_RESIZING     0
1874 #define EXT4_FLAGS_SHUTDOWN     1
1875
1876 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1877 {
1878         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1879 }
1880
1881
1882 /*
1883  * Default values for user and/or group using reserved blocks
1884  */
1885 #define EXT4_DEF_RESUID         0
1886 #define EXT4_DEF_RESGID         0
1887
1888 /*
1889  * Default project ID
1890  */
1891 #define EXT4_DEF_PROJID         0
1892
1893 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1894
1895 /*
1896  * Default mount options
1897  */
1898 #define EXT4_DEFM_DEBUG         0x0001
1899 #define EXT4_DEFM_BSDGROUPS     0x0002
1900 #define EXT4_DEFM_XATTR_USER    0x0004
1901 #define EXT4_DEFM_ACL           0x0008
1902 #define EXT4_DEFM_UID16         0x0010
1903 #define EXT4_DEFM_JMODE         0x0060
1904 #define EXT4_DEFM_JMODE_DATA    0x0020
1905 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1906 #define EXT4_DEFM_JMODE_WBACK   0x0060
1907 #define EXT4_DEFM_NOBARRIER     0x0100
1908 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1909 #define EXT4_DEFM_DISCARD       0x0400
1910 #define EXT4_DEFM_NODELALLOC    0x0800
1911
1912 /*
1913  * Default journal batch times
1914  */
1915 #define EXT4_DEF_MIN_BATCH_TIME 0
1916 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1917
1918 /*
1919  * Minimum number of groups in a flexgroup before we separate out
1920  * directories into the first block group of a flexgroup
1921  */
1922 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1923
1924 /*
1925  * Structure of a directory entry
1926  */
1927 #define EXT4_NAME_LEN 255
1928
1929 struct ext4_dir_entry {
1930         __le32  inode;                  /* Inode number */
1931         __le16  rec_len;                /* Directory entry length */
1932         __le16  name_len;               /* Name length */
1933         char    name[EXT4_NAME_LEN];    /* File name */
1934 };
1935
1936 /*
1937  * The new version of the directory entry.  Since EXT4 structures are
1938  * stored in intel byte order, and the name_len field could never be
1939  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1940  * file_type field.
1941  */
1942 struct ext4_dir_entry_2 {
1943         __le32  inode;                  /* Inode number */
1944         __le16  rec_len;                /* Directory entry length */
1945         __u8    name_len;               /* Name length */
1946         __u8    file_type;
1947         char    name[EXT4_NAME_LEN];    /* File name */
1948 };
1949
1950 /*
1951  * This is a bogus directory entry at the end of each leaf block that
1952  * records checksums.
1953  */
1954 struct ext4_dir_entry_tail {
1955         __le32  det_reserved_zero1;     /* Pretend to be unused */
1956         __le16  det_rec_len;            /* 12 */
1957         __u8    det_reserved_zero2;     /* Zero name length */
1958         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1959         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1960 };
1961
1962 #define EXT4_DIRENT_TAIL(block, blocksize) \
1963         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1964                                         ((blocksize) - \
1965                                          sizeof(struct ext4_dir_entry_tail))))
1966
1967 /*
1968  * Ext4 directory file types.  Only the low 3 bits are used.  The
1969  * other bits are reserved for now.
1970  */
1971 #define EXT4_FT_UNKNOWN         0
1972 #define EXT4_FT_REG_FILE        1
1973 #define EXT4_FT_DIR             2
1974 #define EXT4_FT_CHRDEV          3
1975 #define EXT4_FT_BLKDEV          4
1976 #define EXT4_FT_FIFO            5
1977 #define EXT4_FT_SOCK            6
1978 #define EXT4_FT_SYMLINK         7
1979
1980 #define EXT4_FT_MAX             8
1981
1982 #define EXT4_FT_DIR_CSUM        0xDE
1983
1984 /*
1985  * EXT4_DIR_PAD defines the directory entries boundaries
1986  *
1987  * NOTE: It must be a multiple of 4
1988  */
1989 #define EXT4_DIR_PAD                    4
1990 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1991 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1992                                          ~EXT4_DIR_ROUND)
1993 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1994
1995 /*
1996  * If we ever get support for fs block sizes > page_size, we'll need
1997  * to remove the #if statements in the next two functions...
1998  */
1999 static inline unsigned int
2000 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2001 {
2002         unsigned len = le16_to_cpu(dlen);
2003
2004 #if (PAGE_SIZE >= 65536)
2005         if (len == EXT4_MAX_REC_LEN || len == 0)
2006                 return blocksize;
2007         return (len & 65532) | ((len & 3) << 16);
2008 #else
2009         return len;
2010 #endif
2011 }
2012
2013 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2014 {
2015         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2016                 BUG();
2017 #if (PAGE_SIZE >= 65536)
2018         if (len < 65536)
2019                 return cpu_to_le16(len);
2020         if (len == blocksize) {
2021                 if (blocksize == 65536)
2022                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2023                 else
2024                         return cpu_to_le16(0);
2025         }
2026         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2027 #else
2028         return cpu_to_le16(len);
2029 #endif
2030 }
2031
2032 /*
2033  * Hash Tree Directory indexing
2034  * (c) Daniel Phillips, 2001
2035  */
2036
2037 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2038                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2039 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2040                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2041 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2042
2043 /* Legal values for the dx_root hash_version field: */
2044
2045 #define DX_HASH_LEGACY                  0
2046 #define DX_HASH_HALF_MD4                1
2047 #define DX_HASH_TEA                     2
2048 #define DX_HASH_LEGACY_UNSIGNED         3
2049 #define DX_HASH_HALF_MD4_UNSIGNED       4
2050 #define DX_HASH_TEA_UNSIGNED            5
2051
2052 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2053                               const void *address, unsigned int length)
2054 {
2055         struct {
2056                 struct shash_desc shash;
2057                 char ctx[4];
2058         } desc;
2059
2060         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2061
2062         desc.shash.tfm = sbi->s_chksum_driver;
2063         desc.shash.flags = 0;
2064         *(u32 *)desc.ctx = crc;
2065
2066         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2067
2068         return *(u32 *)desc.ctx;
2069 }
2070
2071 #ifdef __KERNEL__
2072
2073 /* hash info structure used by the directory hash */
2074 struct dx_hash_info
2075 {
2076         u32             hash;
2077         u32             minor_hash;
2078         int             hash_version;
2079         u32             *seed;
2080 };
2081
2082
2083 /* 32 and 64 bit signed EOF for dx directories */
2084 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2085 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2086
2087
2088 /*
2089  * Control parameters used by ext4_htree_next_block
2090  */
2091 #define HASH_NB_ALWAYS          1
2092
2093 struct ext4_filename {
2094         const struct qstr *usr_fname;
2095         struct fscrypt_str disk_name;
2096         struct dx_hash_info hinfo;
2097 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2098         struct fscrypt_str crypto_buf;
2099 #endif
2100 };
2101
2102 #define fname_name(p) ((p)->disk_name.name)
2103 #define fname_len(p)  ((p)->disk_name.len)
2104
2105 /*
2106  * Describe an inode's exact location on disk and in memory
2107  */
2108 struct ext4_iloc
2109 {
2110         struct buffer_head *bh;
2111         unsigned long offset;
2112         ext4_group_t block_group;
2113 };
2114
2115 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2116 {
2117         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2118 }
2119
2120 static inline bool ext4_is_quota_file(struct inode *inode)
2121 {
2122         return IS_NOQUOTA(inode) &&
2123                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2124 }
2125
2126 /*
2127  * This structure is stuffed into the struct file's private_data field
2128  * for directories.  It is where we put information so that we can do
2129  * readdir operations in hash tree order.
2130  */
2131 struct dir_private_info {
2132         struct rb_root  root;
2133         struct rb_node  *curr_node;
2134         struct fname    *extra_fname;
2135         loff_t          last_pos;
2136         __u32           curr_hash;
2137         __u32           curr_minor_hash;
2138         __u32           next_hash;
2139 };
2140
2141 /* calculate the first block number of the group */
2142 static inline ext4_fsblk_t
2143 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2144 {
2145         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2146                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2147 }
2148
2149 /*
2150  * Special error return code only used by dx_probe() and its callers.
2151  */
2152 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2153
2154 /* htree levels for ext4 */
2155 #define EXT4_HTREE_LEVEL_COMPAT 2
2156 #define EXT4_HTREE_LEVEL        3
2157
2158 static inline int ext4_dir_htree_level(struct super_block *sb)
2159 {
2160         return ext4_has_feature_largedir(sb) ?
2161                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2162 }
2163
2164 /*
2165  * Timeout and state flag for lazy initialization inode thread.
2166  */
2167 #define EXT4_DEF_LI_WAIT_MULT                   10
2168 #define EXT4_DEF_LI_MAX_START_DELAY             5
2169 #define EXT4_LAZYINIT_QUIT                      0x0001
2170 #define EXT4_LAZYINIT_RUNNING                   0x0002
2171
2172 /*
2173  * Lazy inode table initialization info
2174  */
2175 struct ext4_lazy_init {
2176         unsigned long           li_state;
2177         struct list_head        li_request_list;
2178         struct mutex            li_list_mtx;
2179 };
2180
2181 struct ext4_li_request {
2182         struct super_block      *lr_super;
2183         struct ext4_sb_info     *lr_sbi;
2184         ext4_group_t            lr_next_group;
2185         struct list_head        lr_request;
2186         unsigned long           lr_next_sched;
2187         unsigned long           lr_timeout;
2188 };
2189
2190 struct ext4_features {
2191         struct kobject f_kobj;
2192         struct completion f_kobj_unregister;
2193 };
2194
2195 /*
2196  * This structure will be used for multiple mount protection. It will be
2197  * written into the block number saved in the s_mmp_block field in the
2198  * superblock. Programs that check MMP should assume that if
2199  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2200  * to use the filesystem, regardless of how old the timestamp is.
2201  */
2202 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2203 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2204 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2205 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2206
2207 struct mmp_struct {
2208         __le32  mmp_magic;              /* Magic number for MMP */
2209         __le32  mmp_seq;                /* Sequence no. updated periodically */
2210
2211         /*
2212          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2213          * purposes and do not affect the correctness of the algorithm
2214          */
2215         __le64  mmp_time;               /* Time last updated */
2216         char    mmp_nodename[64];       /* Node which last updated MMP block */
2217         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2218
2219         /*
2220          * mmp_check_interval is used to verify if the MMP block has been
2221          * updated on the block device. The value is updated based on the
2222          * maximum time to write the MMP block during an update cycle.
2223          */
2224         __le16  mmp_check_interval;
2225
2226         __le16  mmp_pad1;
2227         __le32  mmp_pad2[226];
2228         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2229 };
2230
2231 /* arguments passed to the mmp thread */
2232 struct mmpd_data {
2233         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2234         struct super_block *sb;  /* super block of the fs */
2235 };
2236
2237 /*
2238  * Check interval multiplier
2239  * The MMP block is written every update interval and initially checked every
2240  * update interval x the multiplier (the value is then adapted based on the
2241  * write latency). The reason is that writes can be delayed under load and we
2242  * don't want readers to incorrectly assume that the filesystem is no longer
2243  * in use.
2244  */
2245 #define EXT4_MMP_CHECK_MULT             2UL
2246
2247 /*
2248  * Minimum interval for MMP checking in seconds.
2249  */
2250 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2251
2252 /*
2253  * Maximum interval for MMP checking in seconds.
2254  */
2255 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2256
2257 /*
2258  * Function prototypes
2259  */
2260
2261 /*
2262  * Ok, these declarations are also in <linux/kernel.h> but none of the
2263  * ext4 source programs needs to include it so they are duplicated here.
2264  */
2265 # define NORET_TYPE     /**/
2266 # define ATTRIB_NORET   __attribute__((noreturn))
2267 # define NORET_AND      noreturn,
2268
2269 /* bitmap.c */
2270 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2271 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2272                                 struct ext4_group_desc *gdp,
2273                                 struct buffer_head *bh, int sz);
2274 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2275                                   struct ext4_group_desc *gdp,
2276                                   struct buffer_head *bh, int sz);
2277 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2278                                 struct ext4_group_desc *gdp,
2279                                 struct buffer_head *bh);
2280 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2281                                   struct ext4_group_desc *gdp,
2282                                   struct buffer_head *bh);
2283
2284 /* balloc.c */
2285 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2286                                          ext4_fsblk_t blocknr,
2287                                          ext4_group_t *blockgrpp,
2288                                          ext4_grpblk_t *offsetp);
2289 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2290                                           ext4_fsblk_t block);
2291
2292 extern unsigned int ext4_block_group(struct super_block *sb,
2293                         ext4_fsblk_t blocknr);
2294 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2295                         ext4_fsblk_t blocknr);
2296 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2297 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2298                         ext4_group_t group);
2299 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2300                                          ext4_fsblk_t goal,
2301                                          unsigned int flags,
2302                                          unsigned long *count,
2303                                          int *errp);
2304 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2305                                     s64 nclusters, unsigned int flags);
2306 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2307 extern void ext4_check_blocks_bitmap(struct super_block *);
2308 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2309                                                     ext4_group_t block_group,
2310                                                     struct buffer_head ** bh);
2311 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2312
2313 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2314                                                 ext4_group_t block_group);
2315 extern int ext4_wait_block_bitmap(struct super_block *sb,
2316                                   ext4_group_t block_group,
2317                                   struct buffer_head *bh);
2318 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2319                                                   ext4_group_t block_group);
2320 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2321                                               ext4_group_t block_group,
2322                                               struct ext4_group_desc *gdp);
2323 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2324
2325 static inline bool ext4_encrypted_inode(struct inode *inode)
2326 {
2327         return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
2328 }
2329
2330 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2331 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2332                                                 const struct fscrypt_name *src)
2333 {
2334         memset(dst, 0, sizeof(*dst));
2335
2336         dst->usr_fname = src->usr_fname;
2337         dst->disk_name = src->disk_name;
2338         dst->hinfo.hash = src->hash;
2339         dst->hinfo.minor_hash = src->minor_hash;
2340         dst->crypto_buf = src->crypto_buf;
2341 }
2342
2343 static inline int ext4_fname_setup_filename(struct inode *dir,
2344                                             const struct qstr *iname,
2345                                             int lookup,
2346                                             struct ext4_filename *fname)
2347 {
2348         struct fscrypt_name name;
2349         int err;
2350
2351         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2352         if (err)
2353                 return err;
2354
2355         ext4_fname_from_fscrypt_name(fname, &name);
2356         return 0;
2357 }
2358
2359 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2360                                             struct dentry *dentry,
2361                                             struct ext4_filename *fname)
2362 {
2363         struct fscrypt_name name;
2364         int err;
2365
2366         err = fscrypt_prepare_lookup(dir, dentry, &name);
2367         if (err)
2368                 return err;
2369
2370         ext4_fname_from_fscrypt_name(fname, &name);
2371         return 0;
2372 }
2373
2374 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2375 {
2376         struct fscrypt_name name;
2377
2378         name.crypto_buf = fname->crypto_buf;
2379         fscrypt_free_filename(&name);
2380
2381         fname->crypto_buf.name = NULL;
2382         fname->usr_fname = NULL;
2383         fname->disk_name.name = NULL;
2384 }
2385 #else /* !CONFIG_EXT4_FS_ENCRYPTION */
2386 static inline int ext4_fname_setup_filename(struct inode *dir,
2387                                             const struct qstr *iname,
2388                                             int lookup,
2389                                             struct ext4_filename *fname)
2390 {
2391         fname->usr_fname = iname;
2392         fname->disk_name.name = (unsigned char *) iname->name;
2393         fname->disk_name.len = iname->len;
2394         return 0;
2395 }
2396
2397 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2398                                             struct dentry *dentry,
2399                                             struct ext4_filename *fname)
2400 {
2401         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2402 }
2403
2404 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2405 #endif /* !CONFIG_EXT4_FS_ENCRYPTION */
2406
2407 /* dir.c */
2408 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2409                                   struct file *,
2410                                   struct ext4_dir_entry_2 *,
2411                                   struct buffer_head *, char *, int,
2412                                   unsigned int);
2413 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2414         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2415                                         (de), (bh), (buf), (size), (offset)))
2416 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2417                                 __u32 minor_hash,
2418                                 struct ext4_dir_entry_2 *dirent,
2419                                 struct fscrypt_str *ent_name);
2420 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2421 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2422                              struct buffer_head *bh,
2423                              void *buf, int buf_size,
2424                              struct ext4_filename *fname,
2425                              struct ext4_dir_entry_2 **dest_de);
2426 void ext4_insert_dentry(struct inode *inode,
2427                         struct ext4_dir_entry_2 *de,
2428                         int buf_size,
2429                         struct ext4_filename *fname);
2430 static inline void ext4_update_dx_flag(struct inode *inode)
2431 {
2432         if (!ext4_has_feature_dir_index(inode->i_sb) &&
2433             ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2434                 /* ext4_iget() should have caught this... */
2435                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2436                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2437         }
2438 }
2439 static const unsigned char ext4_filetype_table[] = {
2440         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2441 };
2442
2443 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2444 {
2445         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2446                 return DT_UNKNOWN;
2447
2448         return ext4_filetype_table[filetype];
2449 }
2450 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2451                              void *buf, int buf_size);
2452
2453 /* fsync.c */
2454 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2455
2456 /* hash.c */
2457 extern int ext4fs_dirhash(const char *name, int len, struct
2458                           dx_hash_info *hinfo);
2459
2460 /* ialloc.c */
2461 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2462                                       const struct qstr *qstr, __u32 goal,
2463                                       uid_t *owner, __u32 i_flags,
2464                                       int handle_type, unsigned int line_no,
2465                                       int nblocks);
2466
2467 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2468         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2469                          i_flags, 0, 0, 0)
2470 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2471                                     type, nblocks)                  \
2472         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2473                          0, (type), __LINE__, (nblocks))
2474
2475
2476 extern void ext4_free_inode(handle_t *, struct inode *);
2477 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2478 extern unsigned long ext4_count_free_inodes(struct super_block *);
2479 extern unsigned long ext4_count_dirs(struct super_block *);
2480 extern void ext4_check_inodes_bitmap(struct super_block *);
2481 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2482 extern int ext4_init_inode_table(struct super_block *sb,
2483                                  ext4_group_t group, int barrier);
2484 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2485
2486 /* mballoc.c */
2487 extern const struct seq_operations ext4_mb_seq_groups_ops;
2488 extern long ext4_mb_stats;
2489 extern long ext4_mb_max_to_scan;
2490 extern int ext4_mb_init(struct super_block *);
2491 extern int ext4_mb_release(struct super_block *);
2492 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2493                                 struct ext4_allocation_request *, int *);
2494 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2495 extern void ext4_discard_preallocations(struct inode *);
2496 extern int __init ext4_init_mballoc(void);
2497 extern void ext4_exit_mballoc(void);
2498 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2499                              struct buffer_head *bh, ext4_fsblk_t block,
2500                              unsigned long count, int flags);
2501 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2502                                    ext4_group_t ngroups);
2503 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2504                 ext4_group_t i, struct ext4_group_desc *desc);
2505 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2506                                 ext4_fsblk_t block, unsigned long count);
2507 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2508 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2509
2510 /* inode.c */
2511 int ext4_inode_is_fast_symlink(struct inode *inode);
2512 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2513 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2514 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2515                      bool wait, struct buffer_head **bhs);
2516 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2517                              struct buffer_head *bh_result, int create);
2518 int ext4_get_block(struct inode *inode, sector_t iblock,
2519                    struct buffer_head *bh_result, int create);
2520 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2521                        struct buffer_head *bh_result, int create);
2522 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2523                            struct buffer_head *bh, int create);
2524 int ext4_walk_page_buffers(handle_t *handle,
2525                            struct buffer_head *head,
2526                            unsigned from,
2527                            unsigned to,
2528                            int *partial,
2529                            int (*fn)(handle_t *handle,
2530                                      struct buffer_head *bh));
2531 int do_journal_get_write_access(handle_t *handle,
2532                                 struct buffer_head *bh);
2533 #define FALL_BACK_TO_NONDELALLOC 1
2534 #define CONVERT_INLINE_DATA      2
2535
2536 typedef enum {
2537         EXT4_IGET_NORMAL =      0,
2538         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2539         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2540 } ext4_iget_flags;
2541
2542 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2543                                  ext4_iget_flags flags, const char *function,
2544                                  unsigned int line);
2545
2546 #define ext4_iget(sb, ino, flags) \
2547         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2548
2549 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2550 extern int  ext4_setattr(struct dentry *, struct iattr *);
2551 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2552 extern void ext4_evict_inode(struct inode *);
2553 extern void ext4_clear_inode(struct inode *);
2554 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2555 extern int  ext4_sync_inode(handle_t *, struct inode *);
2556 extern void ext4_dirty_inode(struct inode *, int);
2557 extern int ext4_change_inode_journal_flag(struct inode *, int);
2558 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2559 extern int ext4_inode_attach_jinode(struct inode *inode);
2560 extern int ext4_can_truncate(struct inode *inode);
2561 extern int ext4_truncate(struct inode *);
2562 extern int ext4_break_layouts(struct inode *);
2563 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2564 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2565 extern void ext4_set_inode_flags(struct inode *);
2566 extern int ext4_alloc_da_blocks(struct inode *inode);
2567 extern void ext4_set_aops(struct inode *inode);
2568 extern int ext4_writepage_trans_blocks(struct inode *);
2569 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2570 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2571                              loff_t lstart, loff_t lend);
2572 extern int ext4_page_mkwrite(struct vm_fault *vmf);
2573 extern int ext4_filemap_fault(struct vm_fault *vmf);
2574 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2575 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2576 extern void ext4_da_update_reserve_space(struct inode *inode,
2577                                         int used, int quota_claim);
2578 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2579                               ext4_fsblk_t pblk, ext4_lblk_t len);
2580
2581 /* indirect.c */
2582 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2583                                 struct ext4_map_blocks *map, int flags);
2584 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2585 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2586 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2587 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2588                                  ext4_lblk_t start, ext4_lblk_t end);
2589
2590 /* ioctl.c */
2591 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2592 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2593
2594 /* migrate.c */
2595 extern int ext4_ext_migrate(struct inode *);
2596 extern int ext4_ind_migrate(struct inode *inode);
2597
2598 /* namei.c */
2599 extern int ext4_dirent_csum_verify(struct inode *inode,
2600                                    struct ext4_dir_entry *dirent);
2601 extern int ext4_orphan_add(handle_t *, struct inode *);
2602 extern int ext4_orphan_del(handle_t *, struct inode *);
2603 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2604                                 __u32 start_minor_hash, __u32 *next_hash);
2605 extern int ext4_search_dir(struct buffer_head *bh,
2606                            char *search_buf,
2607                            int buf_size,
2608                            struct inode *dir,
2609                            struct ext4_filename *fname,
2610                            unsigned int offset,
2611                            struct ext4_dir_entry_2 **res_dir);
2612 extern int ext4_generic_delete_entry(handle_t *handle,
2613                                      struct inode *dir,
2614                                      struct ext4_dir_entry_2 *de_del,
2615                                      struct buffer_head *bh,
2616                                      void *entry_buf,
2617                                      int buf_size,
2618                                      int csum_size);
2619 extern bool ext4_empty_dir(struct inode *inode);
2620
2621 /* resize.c */
2622 extern void ext4_kvfree_array_rcu(void *to_free);
2623 extern int ext4_group_add(struct super_block *sb,
2624                                 struct ext4_new_group_data *input);
2625 extern int ext4_group_extend(struct super_block *sb,
2626                                 struct ext4_super_block *es,
2627                                 ext4_fsblk_t n_blocks_count);
2628 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2629
2630 /* super.c */
2631 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2632                                          sector_t block, int op_flags);
2633 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2634 extern int ext4_calculate_overhead(struct super_block *sb);
2635 extern void ext4_superblock_csum_set(struct super_block *sb);
2636 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2637 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2638 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2639                                     ext4_group_t ngroup);
2640 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2641                                      char nbuf[16]);
2642 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2643                                              ext4_group_t block_group,
2644                                              unsigned int flags);
2645
2646 extern __printf(4, 5)
2647 void __ext4_error(struct super_block *, const char *, unsigned int,
2648                   const char *, ...);
2649 extern __printf(5, 6)
2650 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2651                       const char *, ...);
2652 extern __printf(5, 6)
2653 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2654                      const char *, ...);
2655 extern void __ext4_std_error(struct super_block *, const char *,
2656                              unsigned int, int);
2657 extern __printf(4, 5)
2658 void __ext4_abort(struct super_block *, const char *, unsigned int,
2659                   const char *, ...);
2660 extern __printf(4, 5)
2661 void __ext4_warning(struct super_block *, const char *, unsigned int,
2662                     const char *, ...);
2663 extern __printf(4, 5)
2664 void __ext4_warning_inode(const struct inode *inode, const char *function,
2665                           unsigned int line, const char *fmt, ...);
2666 extern __printf(3, 4)
2667 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2668 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2669                            const char *, unsigned int, const char *);
2670 extern __printf(7, 8)
2671 void __ext4_grp_locked_error(const char *, unsigned int,
2672                              struct super_block *, ext4_group_t,
2673                              unsigned long, ext4_fsblk_t,
2674                              const char *, ...);
2675
2676 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2677         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2678
2679 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2680         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2681
2682 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2683         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2684
2685 #ifdef CONFIG_PRINTK
2686
2687 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2688         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2689 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2690         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2691 #define ext4_error(sb, fmt, ...)                                        \
2692         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2693 #define ext4_abort(sb, fmt, ...)                                        \
2694         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2695 #define ext4_warning(sb, fmt, ...)                                      \
2696         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2697 #define ext4_warning_inode(inode, fmt, ...)                             \
2698         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2699 #define ext4_msg(sb, level, fmt, ...)                           \
2700         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2701 #define dump_mmp_msg(sb, mmp, msg)                                      \
2702         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2703 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2704         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2705                                 fmt, ##__VA_ARGS__)
2706
2707 #else
2708
2709 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2710 do {                                                                    \
2711         no_printk(fmt, ##__VA_ARGS__);                                  \
2712         __ext4_error_inode(inode, "", 0, block, " ");                   \
2713 } while (0)
2714 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2715 do {                                                                    \
2716         no_printk(fmt, ##__VA_ARGS__);                                  \
2717         __ext4_error_file(file, "", 0, block, " ");                     \
2718 } while (0)
2719 #define ext4_error(sb, fmt, ...)                                        \
2720 do {                                                                    \
2721         no_printk(fmt, ##__VA_ARGS__);                                  \
2722         __ext4_error(sb, "", 0, " ");                                   \
2723 } while (0)
2724 #define ext4_abort(sb, fmt, ...)                                        \
2725 do {                                                                    \
2726         no_printk(fmt, ##__VA_ARGS__);                                  \
2727         __ext4_abort(sb, "", 0, " ");                                   \
2728 } while (0)
2729 #define ext4_warning(sb, fmt, ...)                                      \
2730 do {                                                                    \
2731         no_printk(fmt, ##__VA_ARGS__);                                  \
2732         __ext4_warning(sb, "", 0, " ");                                 \
2733 } while (0)
2734 #define ext4_warning_inode(inode, fmt, ...)                             \
2735 do {                                                                    \
2736         no_printk(fmt, ##__VA_ARGS__);                                  \
2737         __ext4_warning_inode(inode, "", 0, " ");                        \
2738 } while (0)
2739 #define ext4_msg(sb, level, fmt, ...)                                   \
2740 do {                                                                    \
2741         no_printk(fmt, ##__VA_ARGS__);                                  \
2742         __ext4_msg(sb, "", " ");                                        \
2743 } while (0)
2744 #define dump_mmp_msg(sb, mmp, msg)                                      \
2745         __dump_mmp_msg(sb, mmp, "", 0, "")
2746 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2747 do {                                                                    \
2748         no_printk(fmt, ##__VA_ARGS__);                          \
2749         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2750 } while (0)
2751
2752 #endif
2753
2754 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2755                                         __u32 compat);
2756 extern int ext4_update_rocompat_feature(handle_t *handle,
2757                                         struct super_block *sb, __u32 rocompat);
2758 extern int ext4_update_incompat_feature(handle_t *handle,
2759                                         struct super_block *sb, __u32 incompat);
2760 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2761                                       struct ext4_group_desc *bg);
2762 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2763                                       struct ext4_group_desc *bg);
2764 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2765                                      struct ext4_group_desc *bg);
2766 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2767                                       struct ext4_group_desc *bg);
2768 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2769                                  struct ext4_group_desc *bg);
2770 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2771                                 struct ext4_group_desc *bg);
2772 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2773                                    struct ext4_group_desc *bg);
2774 extern void ext4_block_bitmap_set(struct super_block *sb,
2775                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2776 extern void ext4_inode_bitmap_set(struct super_block *sb,
2777                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2778 extern void ext4_inode_table_set(struct super_block *sb,
2779                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2780 extern void ext4_free_group_clusters_set(struct super_block *sb,
2781                                          struct ext4_group_desc *bg,
2782                                          __u32 count);
2783 extern void ext4_free_inodes_set(struct super_block *sb,
2784                                 struct ext4_group_desc *bg, __u32 count);
2785 extern void ext4_used_dirs_set(struct super_block *sb,
2786                                 struct ext4_group_desc *bg, __u32 count);
2787 extern void ext4_itable_unused_set(struct super_block *sb,
2788                                    struct ext4_group_desc *bg, __u32 count);
2789 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2790                                        struct ext4_group_desc *gdp);
2791 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2792                                      struct ext4_group_desc *gdp);
2793 extern int ext4_register_li_request(struct super_block *sb,
2794                                     ext4_group_t first_not_zeroed);
2795
2796 static inline int ext4_has_metadata_csum(struct super_block *sb)
2797 {
2798         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2799                      !EXT4_SB(sb)->s_chksum_driver);
2800
2801         return ext4_has_feature_metadata_csum(sb) &&
2802                (EXT4_SB(sb)->s_chksum_driver != NULL);
2803 }
2804
2805 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2806 {
2807         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2808 }
2809
2810 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2811 {
2812         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2813                 le32_to_cpu(es->s_blocks_count_lo);
2814 }
2815
2816 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2817 {
2818         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2819                 le32_to_cpu(es->s_r_blocks_count_lo);
2820 }
2821
2822 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2823 {
2824         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2825                 le32_to_cpu(es->s_free_blocks_count_lo);
2826 }
2827
2828 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2829                                          ext4_fsblk_t blk)
2830 {
2831         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2832         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2833 }
2834
2835 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2836                                               ext4_fsblk_t blk)
2837 {
2838         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2839         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2840 }
2841
2842 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2843                                            ext4_fsblk_t blk)
2844 {
2845         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2846         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2847 }
2848
2849 static inline loff_t ext4_isize(struct super_block *sb,
2850                                 struct ext4_inode *raw_inode)
2851 {
2852         if (ext4_has_feature_largedir(sb) ||
2853             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2854                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2855                         le32_to_cpu(raw_inode->i_size_lo);
2856
2857         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2858 }
2859
2860 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2861 {
2862         raw_inode->i_size_lo = cpu_to_le32(i_size);
2863         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2864 }
2865
2866 static inline
2867 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2868                                             ext4_group_t group)
2869 {
2870          struct ext4_group_info **grp_info;
2871          long indexv, indexh;
2872          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2873          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2874          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2875          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
2876          return grp_info[indexh];
2877 }
2878
2879 /*
2880  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2881  * the locking protocol documented in the comments of ext4_group_add()
2882  * in resize.c
2883  */
2884 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2885 {
2886         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2887
2888         smp_rmb();
2889         return ngroups;
2890 }
2891
2892 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2893                                              ext4_group_t block_group)
2894 {
2895         return block_group >> sbi->s_log_groups_per_flex;
2896 }
2897
2898 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2899 {
2900         return 1 << sbi->s_log_groups_per_flex;
2901 }
2902
2903 #define ext4_std_error(sb, errno)                               \
2904 do {                                                            \
2905         if ((errno))                                            \
2906                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2907 } while (0)
2908
2909 #ifdef CONFIG_SMP
2910 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2911  * counters. So we need to make sure we have free clusters more
2912  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2913  */
2914 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2915 #else
2916 #define EXT4_FREECLUSTERS_WATERMARK 0
2917 #endif
2918
2919 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2920 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2921 {
2922         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2923                      !inode_is_locked(inode));
2924         down_write(&EXT4_I(inode)->i_data_sem);
2925         if (newsize > EXT4_I(inode)->i_disksize)
2926                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
2927         up_write(&EXT4_I(inode)->i_data_sem);
2928 }
2929
2930 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2931 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2932 {
2933         int changed = 0;
2934
2935         if (newsize > inode->i_size) {
2936                 i_size_write(inode, newsize);
2937                 changed = 1;
2938         }
2939         if (newsize > EXT4_I(inode)->i_disksize) {
2940                 ext4_update_i_disksize(inode, newsize);
2941                 changed |= 2;
2942         }
2943         return changed;
2944 }
2945
2946 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2947                                       loff_t len);
2948
2949 struct ext4_group_info {
2950         unsigned long   bb_state;
2951         struct rb_root  bb_free_root;
2952         ext4_grpblk_t   bb_first_free;  /* first free block */
2953         ext4_grpblk_t   bb_free;        /* total free blocks */
2954         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2955         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2956         struct          list_head bb_prealloc_list;
2957 #ifdef DOUBLE_CHECK
2958         void            *bb_bitmap;
2959 #endif
2960         struct rw_semaphore alloc_sem;
2961         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2962                                          * regions, index is order.
2963                                          * bb_counters[3] = 5 means
2964                                          * 5 free 8-block regions. */
2965 };
2966
2967 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2968 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2969 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2970 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2971 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
2972         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
2973 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
2974         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
2975
2976 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2977         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2978 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2979         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2980 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2981         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2982
2983 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2984         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2985 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2986         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2987 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2988         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2989
2990 #define EXT4_MAX_CONTENTION             8
2991 #define EXT4_CONTENTION_THRESHOLD       2
2992
2993 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2994                                               ext4_group_t group)
2995 {
2996         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2997 }
2998
2999 /*
3000  * Returns true if the filesystem is busy enough that attempts to
3001  * access the block group locks has run into contention.
3002  */
3003 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3004 {
3005         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3006 }
3007
3008 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3009 {
3010         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3011         if (spin_trylock(lock))
3012                 /*
3013                  * We're able to grab the lock right away, so drop the
3014                  * lock contention counter.
3015                  */
3016                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3017         else {
3018                 /*
3019                  * The lock is busy, so bump the contention counter,
3020                  * and then wait on the spin lock.
3021                  */
3022                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3023                                   EXT4_MAX_CONTENTION);
3024                 spin_lock(lock);
3025         }
3026 }
3027
3028 static inline void ext4_unlock_group(struct super_block *sb,
3029                                         ext4_group_t group)
3030 {
3031         spin_unlock(ext4_group_lock_ptr(sb, group));
3032 }
3033
3034 /*
3035  * Block validity checking
3036  */
3037 #define ext4_check_indirect_blockref(inode, bh)                         \
3038         ext4_check_blockref(__func__, __LINE__, inode,                  \
3039                             (__le32 *)(bh)->b_data,                     \
3040                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3041
3042 #define ext4_ind_check_inode(inode)                                     \
3043         ext4_check_blockref(__func__, __LINE__, inode,                  \
3044                             EXT4_I(inode)->i_data,                      \
3045                             EXT4_NDIR_BLOCKS)
3046
3047 /*
3048  * Inodes and files operations
3049  */
3050
3051 /* dir.c */
3052 extern const struct file_operations ext4_dir_operations;
3053
3054 /* file.c */
3055 extern const struct inode_operations ext4_file_inode_operations;
3056 extern const struct file_operations ext4_file_operations;
3057 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3058
3059 /* inline.c */
3060 extern int ext4_get_max_inline_size(struct inode *inode);
3061 extern int ext4_find_inline_data_nolock(struct inode *inode);
3062 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3063                                  unsigned int len);
3064 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3065
3066 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3067 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3068                                          struct inode *inode,
3069                                          loff_t pos, unsigned len,
3070                                          unsigned flags,
3071                                          struct page **pagep);
3072 extern int ext4_write_inline_data_end(struct inode *inode,
3073                                       loff_t pos, unsigned len,
3074                                       unsigned copied,
3075                                       struct page *page);
3076 extern struct buffer_head *
3077 ext4_journalled_write_inline_data(struct inode *inode,
3078                                   unsigned len,
3079                                   struct page *page);
3080 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3081                                            struct inode *inode,
3082                                            loff_t pos, unsigned len,
3083                                            unsigned flags,
3084                                            struct page **pagep,
3085                                            void **fsdata);
3086 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3087                                          unsigned len, unsigned copied,
3088                                          struct page *page);
3089 extern int ext4_try_add_inline_entry(handle_t *handle,
3090                                      struct ext4_filename *fname,
3091                                      struct inode *dir, struct inode *inode);
3092 extern int ext4_try_create_inline_dir(handle_t *handle,
3093                                       struct inode *parent,
3094                                       struct inode *inode);
3095 extern int ext4_read_inline_dir(struct file *filp,
3096                                 struct dir_context *ctx,
3097                                 int *has_inline_data);
3098 extern int htree_inlinedir_to_tree(struct file *dir_file,
3099                                    struct inode *dir, ext4_lblk_t block,
3100                                    struct dx_hash_info *hinfo,
3101                                    __u32 start_hash, __u32 start_minor_hash,
3102                                    int *has_inline_data);
3103 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3104                                         struct ext4_filename *fname,
3105                                         struct ext4_dir_entry_2 **res_dir,
3106                                         int *has_inline_data);
3107 extern int ext4_delete_inline_entry(handle_t *handle,
3108                                     struct inode *dir,
3109                                     struct ext4_dir_entry_2 *de_del,
3110                                     struct buffer_head *bh,
3111                                     int *has_inline_data);
3112 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3113 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3114                                         struct ext4_dir_entry_2 **parent_de,
3115                                         int *retval);
3116 extern int ext4_inline_data_fiemap(struct inode *inode,
3117                                    struct fiemap_extent_info *fieinfo,
3118                                    int *has_inline, __u64 start, __u64 len);
3119
3120 struct iomap;
3121 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3122
3123 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3124
3125 extern int ext4_convert_inline_data(struct inode *inode);
3126
3127 static inline int ext4_has_inline_data(struct inode *inode)
3128 {
3129         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3130                EXT4_I(inode)->i_inline_off;
3131 }
3132
3133 /* namei.c */
3134 extern const struct inode_operations ext4_dir_inode_operations;
3135 extern const struct inode_operations ext4_special_inode_operations;
3136 extern struct dentry *ext4_get_parent(struct dentry *child);
3137 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3138                                  struct ext4_dir_entry_2 *de,
3139                                  int blocksize, int csum_size,
3140                                  unsigned int parent_ino, int dotdot_real_len);
3141 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3142                                    unsigned int blocksize);
3143 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3144                                          struct inode *inode,
3145                                          struct buffer_head *bh);
3146 #define S_SHIFT 12
3147 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3148         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3149         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3150         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3151         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3152         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3153         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3154         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3155 };
3156
3157 static inline void ext4_set_de_type(struct super_block *sb,
3158                                 struct ext4_dir_entry_2 *de,
3159                                 umode_t mode) {
3160         if (ext4_has_feature_filetype(sb))
3161                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3162 }
3163
3164 /* readpages.c */
3165 extern int ext4_mpage_readpages(struct address_space *mapping,
3166                                 struct list_head *pages, struct page *page,
3167                                 unsigned nr_pages, bool is_readahead);
3168
3169 /* symlink.c */
3170 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3171 extern const struct inode_operations ext4_symlink_inode_operations;
3172 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3173
3174 /* sysfs.c */
3175 extern int ext4_register_sysfs(struct super_block *sb);
3176 extern void ext4_unregister_sysfs(struct super_block *sb);
3177 extern int __init ext4_init_sysfs(void);
3178 extern void ext4_exit_sysfs(void);
3179
3180 /* block_validity */
3181 extern void ext4_release_system_zone(struct super_block *sb);
3182 extern int ext4_setup_system_zone(struct super_block *sb);
3183 extern int __init ext4_init_system_zone(void);
3184 extern void ext4_exit_system_zone(void);
3185 extern int ext4_inode_block_valid(struct inode *inode,
3186                                   ext4_fsblk_t start_blk,
3187                                   unsigned int count);
3188 extern int ext4_check_blockref(const char *, unsigned int,
3189                                struct inode *, __le32 *, unsigned int);
3190
3191 /* extents.c */
3192 struct ext4_ext_path;
3193 struct ext4_extent;
3194
3195 /*
3196  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3197  * __le32.
3198  */
3199 #define EXT_MAX_BLOCKS  0xffffffff
3200
3201 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3202 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3203 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3204 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3205                                struct ext4_map_blocks *map, int flags);
3206 extern int ext4_ext_truncate(handle_t *, struct inode *);
3207 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3208                                  ext4_lblk_t end);
3209 extern void ext4_ext_init(struct super_block *);
3210 extern void ext4_ext_release(struct super_block *);
3211 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3212                           loff_t len);
3213 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3214                                           loff_t offset, ssize_t len);
3215 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3216                            struct ext4_map_blocks *map, int flags);
3217 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3218                                          ext4_lblk_t lblocks);
3219 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3220                                                    int num,
3221                                                    struct ext4_ext_path *path);
3222 extern int ext4_can_extents_be_merged(struct inode *inode,
3223                                       struct ext4_extent *ex1,
3224                                       struct ext4_extent *ex2);
3225 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3226                                   struct ext4_ext_path **,
3227                                   struct ext4_extent *, int);
3228 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3229                                               struct ext4_ext_path **,
3230                                               int flags);
3231 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3232 extern int ext4_ext_check_inode(struct inode *inode);
3233 extern int ext4_find_delalloc_range(struct inode *inode,
3234                                     ext4_lblk_t lblk_start,
3235                                     ext4_lblk_t lblk_end);
3236 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3237 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3238 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3239                         __u64 start, __u64 len);
3240 extern int ext4_ext_precache(struct inode *inode);
3241 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3242 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3243 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3244                                 struct inode *inode2, ext4_lblk_t lblk1,
3245                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3246                              int mark_unwritten,int *err);
3247
3248 /* move_extent.c */
3249 extern void ext4_double_down_write_data_sem(struct inode *first,
3250                                             struct inode *second);
3251 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3252                                           struct inode *donor_inode);
3253 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3254                              __u64 start_orig, __u64 start_donor,
3255                              __u64 len, __u64 *moved_len);
3256
3257 /* page-io.c */
3258 extern int __init ext4_init_pageio(void);
3259 extern void ext4_exit_pageio(void);
3260 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3261 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3262 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3263 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3264 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3265                                 struct writeback_control *wbc);
3266 extern void ext4_end_io_rsv_work(struct work_struct *work);
3267 extern void ext4_io_submit(struct ext4_io_submit *io);
3268 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3269                                struct page *page,
3270                                int len,
3271                                struct writeback_control *wbc,
3272                                bool keep_towrite);
3273
3274 /* mmp.c */
3275 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3276
3277 /*
3278  * Add new method to test whether block and inode bitmaps are properly
3279  * initialized. With uninit_bg reading the block from disk is not enough
3280  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3281  */
3282 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3283
3284 static inline int bitmap_uptodate(struct buffer_head *bh)
3285 {
3286         return (buffer_uptodate(bh) &&
3287                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3288 }
3289 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3290 {
3291         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3292 }
3293
3294 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3295
3296 /* For ioend & aio unwritten conversion wait queues */
3297 #define EXT4_WQ_HASH_SZ         37
3298 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3299                                             EXT4_WQ_HASH_SZ])
3300 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3301
3302 extern int ext4_resize_begin(struct super_block *sb);
3303 extern void ext4_resize_end(struct super_block *sb);
3304
3305 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3306                                               struct ext4_io_end *io_end)
3307 {
3308         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3309                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3310                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3311         }
3312 }
3313
3314 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3315 {
3316         struct inode *inode = io_end->inode;
3317
3318         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3319                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3320                 /* Wake up anyone waiting on unwritten extent conversion */
3321                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3322                         wake_up_all(ext4_ioend_wq(inode));
3323         }
3324 }
3325
3326 extern const struct iomap_ops ext4_iomap_ops;
3327
3328 #endif  /* __KERNEL__ */
3329
3330 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3331 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3332
3333 #endif  /* _EXT4_H */