root/fs/ext4/ext4.h

INCLUDED FROM

DEFINITIONS

1. ext4_mask_flags
2. ext4_check_flag_values
3. ext4_encode_extra_time
4. ext4_decode_extra_time
5. EXT4_SB
6. EXT4_I
7. ext4_valid_inum
8. EXT4_INODE_BIT_FNS
9. EXT4_INODE_BIT_FNS
10. ext4_verity_in_progress
11. EXTN_FEATURE_FUNCS
12. ext4_has_ro_compat_features
13. ext4_has_incompat_features
14. ext4_forced_shutdown
15. ext4_rec_len_from_disk
16. ext4_rec_len_to_disk
17. ext4_chksum
18. ext4_raw_inode
19. ext4_is_quota_file
20. ext4_group_first_block_no
21. ext4_dir_htree_level
22. ext4_fname_from_fscrypt_name
23. ext4_fname_setup_filename
24. ext4_fname_prepare_lookup
25. ext4_fname_free_filename
26. ext4_fname_setup_filename
27. ext4_fname_prepare_lookup
28. ext4_fname_free_filename
29. ext4_update_dx_flag
30. get_dtype
31. ext4_has_metadata_csum
32. ext4_has_group_desc_csum
33. ext4_blocks_count
34. ext4_r_blocks_count
35. ext4_free_blocks_count
36. ext4_blocks_count_set
37. ext4_free_blocks_count_set
38. ext4_r_blocks_count_set
39. ext4_isize
40. ext4_isize_set
41. ext4_get_group_info
42. ext4_get_groups_count
43. ext4_flex_group
44. ext4_flex_bg_size
45. ext4_update_i_disksize
46. ext4_update_inode_size
47. ext4_group_lock_ptr
48. ext4_fs_is_busy
49. ext4_lock_group
50. ext4_unlock_group
51. ext4_has_inline_data
52. ext4_set_de_type
53. bitmap_uptodate
54. set_bitmap_uptodate
55. ext4_set_io_unwritten_flag
56. ext4_clear_io_unwritten_flag
57. ext4_buffer_uptodate

   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 #include <linux/fscrypt.h>
  44 #include <linux/fsverity.h>
  45 
  46 #include <linux/compiler.h>
  47 
  48 /*
  49  * The fourth extended filesystem constants/structures
  50  */
  51 
  52 /*
  53  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  54  * structures. these checks slow things down a lot
  55  */
  56 #define AGGRESSIVE_CHECK__
  57 
  58 /*
  59  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  60  * bitmaps, maintains and uses them to check for double allocations
  61  */
  62 #define DOUBLE_CHECK__
  63 
  64 /*
  65  * Define EXT4FS_DEBUG to produce debug messages
  66  */
  67 #undef EXT4FS_DEBUG
  68 
  69 /*
  70  * Debug code
  71  */
  72 #ifdef EXT4FS_DEBUG
  73 #define ext4_debug(f, a...)                                             \
  74         do {                                                            \
  75                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  76                         __FILE__, __LINE__, __func__);                  \
  77                 printk(KERN_DEBUG f, ## a);                             \
  78         } while (0)
  79 #else
  80 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  81 #endif
  82 
  83 /*
  84  * Turn on EXT_DEBUG to get lots of info about extents operations.
  85  */
  86 #define EXT_DEBUG__
  87 #ifdef EXT_DEBUG
  88 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  89 #else
  90 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
  91 #endif
  92 
  93 /* data type for block offset of block group */
  94 typedef int ext4_grpblk_t;
  95 
  96 /* data type for filesystem-wide blocks number */
  97 typedef unsigned long long ext4_fsblk_t;
  98 
  99 /* data type for file logical block number */
 100 typedef __u32 ext4_lblk_t;
 101 
 102 /* data type for block group number */
 103 typedef unsigned int ext4_group_t;
 104 
 105 enum SHIFT_DIRECTION {
 106         SHIFT_LEFT = 0,
 107         SHIFT_RIGHT,
 108 };
 109 
 110 /*
 111  * Flags used in mballoc's allocation_context flags field.
 112  *
 113  * Also used to show what's going on for debugging purposes when the
 114  * flag field is exported via the traceport interface
 115  */
 116 
 117 /* prefer goal again. length */
 118 #define EXT4_MB_HINT_MERGE              0x0001
 119 /* blocks already reserved */
 120 #define EXT4_MB_HINT_RESERVED           0x0002
 121 /* metadata is being allocated */
 122 #define EXT4_MB_HINT_METADATA           0x0004
 123 /* first blocks in the file */
 124 #define EXT4_MB_HINT_FIRST              0x0008
 125 /* search for the best chunk */
 126 #define EXT4_MB_HINT_BEST               0x0010
 127 /* data is being allocated */
 128 #define EXT4_MB_HINT_DATA               0x0020
 129 /* don't preallocate (for tails) */
 130 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 131 /* allocate for locality group */
 132 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 133 /* allocate goal blocks or none */
 134 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 135 /* goal is meaningful */
 136 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 137 /* blocks already pre-reserved by delayed allocation */
 138 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 139 /* We are doing stream allocation */
 140 #define EXT4_MB_STREAM_ALLOC            0x0800
 141 /* Use reserved root blocks if needed */
 142 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 143 /* Use blocks from reserved pool */
 144 #define EXT4_MB_USE_RESERVED            0x2000
 145 
 146 struct ext4_allocation_request {
 147         /* target inode for block we're allocating */
 148         struct inode *inode;
 149         /* how many blocks we want to allocate */
 150         unsigned int len;
 151         /* logical block in target inode */
 152         ext4_lblk_t logical;
 153         /* the closest logical allocated block to the left */
 154         ext4_lblk_t lleft;
 155         /* the closest logical allocated block to the right */
 156         ext4_lblk_t lright;
 157         /* phys. target (a hint) */
 158         ext4_fsblk_t goal;
 159         /* phys. block for the closest logical allocated block to the left */
 160         ext4_fsblk_t pleft;
 161         /* phys. block for the closest logical allocated block to the right */
 162         ext4_fsblk_t pright;
 163         /* flags. see above EXT4_MB_HINT_* */
 164         unsigned int flags;
 165 };
 166 
 167 /*
 168  * Logical to physical block mapping, used by ext4_map_blocks()
 169  *
 170  * This structure is used to pass requests into ext4_map_blocks() as
 171  * well as to store the information returned by ext4_map_blocks().  It
 172  * takes less room on the stack than a struct buffer_head.
 173  */
 174 #define EXT4_MAP_NEW            (1 << BH_New)
 175 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 176 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 177 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 178 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 179                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 180 
 181 struct ext4_map_blocks {
 182         ext4_fsblk_t m_pblk;
 183         ext4_lblk_t m_lblk;
 184         unsigned int m_len;
 185         unsigned int m_flags;
 186 };
 187 
 188 /*
 189  * Block validity checking, system zone rbtree.
 190  */
 191 struct ext4_system_blocks {
 192         struct rb_root root;
 193         struct rcu_head rcu;
 194 };
 195 
 196 /*
 197  * Flags for ext4_io_end->flags
 198  */
 199 #define EXT4_IO_END_UNWRITTEN   0x0001
 200 
 201 /*
 202  * For converting unwritten extents on a work queue. 'handle' is used for
 203  * buffered writeback.
 204  */
 205 typedef struct ext4_io_end {
 206         struct list_head        list;           /* per-file finished IO list */
 207         handle_t                *handle;        /* handle reserved for extent
 208                                                  * conversion */
 209         struct inode            *inode;         /* file being written to */
 210         struct bio              *bio;           /* Linked list of completed
 211                                                  * bios covering the extent */
 212         unsigned int            flag;           /* unwritten or not */
 213         atomic_t                count;          /* reference counter */
 214         loff_t                  offset;         /* offset in the file */
 215         ssize_t                 size;           /* size of the extent */
 216 } ext4_io_end_t;
 217 
 218 struct ext4_io_submit {
 219         struct writeback_control *io_wbc;
 220         struct bio              *io_bio;
 221         ext4_io_end_t           *io_end;
 222         sector_t                io_next_block;
 223 };
 224 
 225 /*
 226  * Special inodes numbers
 227  */
 228 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 229 #define EXT4_ROOT_INO            2      /* Root inode */
 230 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 231 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 232 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 233 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 234 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 235 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 236 
 237 /* First non-reserved inode for old ext4 filesystems */
 238 #define EXT4_GOOD_OLD_FIRST_INO 11
 239 
 240 /*
 241  * Maximal count of links to a file
 242  */
 243 #define EXT4_LINK_MAX           65000
 244 
 245 /*
 246  * Macro-instructions used to manage several block sizes
 247  */
 248 #define EXT4_MIN_BLOCK_SIZE             1024
 249 #define EXT4_MAX_BLOCK_SIZE             65536
 250 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 251 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 252 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 253 #ifdef __KERNEL__
 254 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 255 #else
 256 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 257 #endif
 258 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 259 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 260                                          EXT4_SB(s)->s_cluster_bits)
 261 #ifdef __KERNEL__
 262 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 263 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 264 #else
 265 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 266 #endif
 267 #ifdef __KERNEL__
 268 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 269 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 270 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 271 #else
 272 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 273                                  EXT4_GOOD_OLD_INODE_SIZE : \
 274                                  (s)->s_inode_size)
 275 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 276                                  EXT4_GOOD_OLD_FIRST_INO : \
 277                                  (s)->s_first_ino)
 278 #endif
 279 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 280 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 281         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 282                                                                   blkbits))
 283 
 284 /* Translate a block number to a cluster number */
 285 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 286 /* Translate a cluster number to a block number */
 287 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 288 /* Translate # of blks to # of clusters */
 289 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 290                                  (sbi)->s_cluster_bits)
 291 /* Mask out the low bits to get the starting block of the cluster */
 292 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 293                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 294 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 295                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 296 /* Fill in the low bits to get the last block of the cluster */
 297 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
 298                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
 299 /* Get the cluster offset */
 300 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 301                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 302 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 303                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 304 
 305 /*
 306  * Structure of a blocks group descriptor
 307  */
 308 struct ext4_group_desc
 309 {
 310         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 311         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 312         __le32  bg_inode_table_lo;      /* Inodes table block */
 313         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 314         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 315         __le16  bg_used_dirs_count_lo;  /* Directories count */
 316         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 317         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 318         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 319         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 320         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 321         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 322         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 323         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 324         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 325         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 326         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 327         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 328         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 329         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 330         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 331         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 332         __u32   bg_reserved;
 333 };
 334 
 335 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 336         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 337          sizeof(__le16))
 338 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 339         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 340          sizeof(__le16))
 341 
 342 /*
 343  * Structure of a flex block group info
 344  */
 345 
 346 struct flex_groups {
 347         atomic64_t      free_clusters;
 348         atomic_t        free_inodes;
 349         atomic_t        used_dirs;
 350 };
 351 
 352 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 353 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 354 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 355 
 356 /*
 357  * Macro-instructions used to manage group descriptors
 358  */
 359 #define EXT4_MIN_DESC_SIZE              32
 360 #define EXT4_MIN_DESC_SIZE_64BIT        64
 361 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 362 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 363 #ifdef __KERNEL__
 364 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 365 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 366 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 367 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 368 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 369 #else
 370 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 371 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 372 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 373 #endif
 374 
 375 /*
 376  * Constants relative to the data blocks
 377  */
 378 #define EXT4_NDIR_BLOCKS                12
 379 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 380 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 381 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 382 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 383 
 384 /*
 385  * Inode flags
 386  */
 387 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 388 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 389 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 390 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 391 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 392 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 393 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 394 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 395 /* Reserved for compression usage... */
 396 #define EXT4_DIRTY_FL                   0x00000100
 397 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 398 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 399         /* nb: was previously EXT2_ECOMPR_FL */
 400 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 401 /* End compression flags --- maybe not all used */
 402 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 403 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 404 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 405 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 406 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 407 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 408 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 409 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 410 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 411 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 412 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 413 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 414 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 415 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded file */
 416 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 417 
 418 #define EXT4_FL_USER_VISIBLE            0x705BDFFF /* User visible flags */
 419 #define EXT4_FL_USER_MODIFIABLE         0x604BC0FF /* User modifiable flags */
 420 
 421 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 422 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 423                                          EXT4_IMMUTABLE_FL | \
 424                                          EXT4_APPEND_FL | \
 425                                          EXT4_NODUMP_FL | \
 426                                          EXT4_NOATIME_FL | \
 427                                          EXT4_PROJINHERIT_FL)
 428 
 429 /* Flags that should be inherited by new inodes from their parent. */
 430 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 431                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 432                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 433                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 434                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL)
 435 
 436 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 437 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 438                            EXT4_PROJINHERIT_FL))
 439 
 440 /* Flags that are appropriate for non-directories/regular files. */
 441 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 442 
 443 /* The only flags that should be swapped */
 444 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 445 
 446 /* Mask out flags that are inappropriate for the given type of inode. */
 447 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 448 {
 449         if (S_ISDIR(mode))
 450                 return flags;
 451         else if (S_ISREG(mode))
 452                 return flags & EXT4_REG_FLMASK;
 453         else
 454                 return flags & EXT4_OTHER_FLMASK;
 455 }
 456 
 457 /*
 458  * Inode flags used for atomic set/get
 459  */
 460 enum {
 461         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 462         EXT4_INODE_UNRM         = 1,    /* Undelete */
 463         EXT4_INODE_COMPR        = 2,    /* Compress file */
 464         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 465         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 466         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 467         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 468         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 469 /* Reserved for compression usage... */
 470         EXT4_INODE_DIRTY        = 8,
 471         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 472         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 473         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 474 /* End compression flags --- maybe not all used */
 475         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 476         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 477         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 478         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 479         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 480         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 481         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 482         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 483         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 484         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 485         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 486         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 487         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 488         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 489 };
 490 
 491 /*
 492  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 493  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 494  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 495  * any extra space in the compiled kernel image, otherwise, the build will fail.
 496  * It's important that these values are the same, since we are using
 497  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 498  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 499  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 500  * defined in e2fsprogs.
 501  *
 502  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 503  */
 504 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 505 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 506 
 507 static inline void ext4_check_flag_values(void)
 508 {
 509         CHECK_FLAG_VALUE(SECRM);
 510         CHECK_FLAG_VALUE(UNRM);
 511         CHECK_FLAG_VALUE(COMPR);
 512         CHECK_FLAG_VALUE(SYNC);
 513         CHECK_FLAG_VALUE(IMMUTABLE);
 514         CHECK_FLAG_VALUE(APPEND);
 515         CHECK_FLAG_VALUE(NODUMP);
 516         CHECK_FLAG_VALUE(NOATIME);
 517         CHECK_FLAG_VALUE(DIRTY);
 518         CHECK_FLAG_VALUE(COMPRBLK);
 519         CHECK_FLAG_VALUE(NOCOMPR);
 520         CHECK_FLAG_VALUE(ENCRYPT);
 521         CHECK_FLAG_VALUE(INDEX);
 522         CHECK_FLAG_VALUE(IMAGIC);
 523         CHECK_FLAG_VALUE(JOURNAL_DATA);
 524         CHECK_FLAG_VALUE(NOTAIL);
 525         CHECK_FLAG_VALUE(DIRSYNC);
 526         CHECK_FLAG_VALUE(TOPDIR);
 527         CHECK_FLAG_VALUE(HUGE_FILE);
 528         CHECK_FLAG_VALUE(EXTENTS);
 529         CHECK_FLAG_VALUE(VERITY);
 530         CHECK_FLAG_VALUE(EA_INODE);
 531         CHECK_FLAG_VALUE(EOFBLOCKS);
 532         CHECK_FLAG_VALUE(INLINE_DATA);
 533         CHECK_FLAG_VALUE(PROJINHERIT);
 534         CHECK_FLAG_VALUE(RESERVED);
 535 }
 536 
 537 /* Used to pass group descriptor data when online resize is done */
 538 struct ext4_new_group_input {
 539         __u32 group;            /* Group number for this data */
 540         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 541         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 542         __u64 inode_table;      /* Absolute block number of inode table start */
 543         __u32 blocks_count;     /* Total number of blocks in this group */
 544         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 545         __u16 unused;
 546 };
 547 
 548 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 549 struct compat_ext4_new_group_input {
 550         u32 group;
 551         compat_u64 block_bitmap;
 552         compat_u64 inode_bitmap;
 553         compat_u64 inode_table;
 554         u32 blocks_count;
 555         u16 reserved_blocks;
 556         u16 unused;
 557 };
 558 #endif
 559 
 560 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 561 struct ext4_new_group_data {
 562         __u32 group;
 563         __u64 block_bitmap;
 564         __u64 inode_bitmap;
 565         __u64 inode_table;
 566         __u32 blocks_count;
 567         __u16 reserved_blocks;
 568         __u16 mdata_blocks;
 569         __u32 free_clusters_count;
 570 };
 571 
 572 /* Indexes used to index group tables in ext4_new_group_data */
 573 enum {
 574         BLOCK_BITMAP = 0,       /* block bitmap */
 575         INODE_BITMAP,           /* inode bitmap */
 576         INODE_TABLE,            /* inode tables */
 577         GROUP_TABLE_COUNT,
 578 };
 579 
 580 /*
 581  * Flags used by ext4_map_blocks()
 582  */
 583         /* Allocate any needed blocks and/or convert an unwritten
 584            extent to be an initialized ext4 */
 585 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 586         /* Request the creation of an unwritten extent */
 587 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 588 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 589                                                  EXT4_GET_BLOCKS_CREATE)
 590         /* Caller is from the delayed allocation writeout path
 591          * finally doing the actual allocation of delayed blocks */
 592 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 593         /* caller is from the direct IO path, request to creation of an
 594         unwritten extents if not allocated, split the unwritten
 595         extent if blocks has been preallocated already*/
 596 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 597 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 598 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 599                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 600         /* Convert extent to initialized after IO complete */
 601 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 602                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 603         /* Eventual metadata allocation (due to growing extent tree)
 604          * should not fail, so try to use reserved blocks for that.*/
 605 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 606         /* Don't normalize allocation size (used for fallocate) */
 607 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 608         /* Request will not result in inode size update (user for fallocate) */
 609 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 610         /* Convert written extents to unwritten */
 611 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 612         /* Write zeros to newly created written extents */
 613 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 614 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 615                                         EXT4_GET_BLOCKS_ZERO)
 616         /* Caller will submit data before dropping transaction handle. This
 617          * allows jbd2 to avoid submitting data before commit. */
 618 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 619 
 620 /*
 621  * The bit position of these flags must not overlap with any of the
 622  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 623  * read_extent_tree_block(), ext4_split_extent_at(),
 624  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 625  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 626  * caching the extents when reading from the extent tree while a
 627  * truncate or punch hole operation is in progress.
 628  */
 629 #define EXT4_EX_NOCACHE                         0x40000000
 630 #define EXT4_EX_FORCE_CACHE                     0x20000000
 631 
 632 /*
 633  * Flags used by ext4_free_blocks
 634  */
 635 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 636 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 637 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 638 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 639 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 640 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 641 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 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 /* ioctl codes 19--39 are reserved for fscrypt */
 668 #define EXT4_IOC_CLEAR_ES_CACHE         _IO('f', 40)
 669 #define EXT4_IOC_GETSTATE               _IOW('f', 41, __u32)
 670 #define EXT4_IOC_GET_ES_CACHE           _IOWR('f', 42, struct fiemap)
 671 
 672 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 673 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 674 
 675 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 676 
 677 /*
 678  * Flags for going down operation
 679  */
 680 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 681 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 682 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 683 
 684 /*
 685  * Flags returned by EXT4_IOC_GETSTATE
 686  *
 687  * We only expose to userspace a subset of the state flags in
 688  * i_state_flags
 689  */
 690 #define EXT4_STATE_FLAG_EXT_PRECACHED   0x00000001
 691 #define EXT4_STATE_FLAG_NEW             0x00000002
 692 #define EXT4_STATE_FLAG_NEWENTRY        0x00000004
 693 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE  0x00000008
 694 
 695 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 696 /*
 697  * ioctl commands in 32 bit emulation
 698  */
 699 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 700 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 701 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 702 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 703 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 704 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 705 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 706 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 707 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 708 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 709 #endif
 710 
 711 /*
 712  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 713  * It indicates that the entry in extent status cache is for a hole.
 714  */
 715 #define EXT4_FIEMAP_EXTENT_HOLE         0x08000000
 716 
 717 /* Max physical block we can address w/o extents */
 718 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 719 
 720 /* Max logical block we can support */
 721 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
 722 
 723 /*
 724  * Structure of an inode on the disk
 725  */
 726 struct ext4_inode {
 727         __le16  i_mode;         /* File mode */
 728         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 729         __le32  i_size_lo;      /* Size in bytes */
 730         __le32  i_atime;        /* Access time */
 731         __le32  i_ctime;        /* Inode Change time */
 732         __le32  i_mtime;        /* Modification time */
 733         __le32  i_dtime;        /* Deletion Time */
 734         __le16  i_gid;          /* Low 16 bits of Group Id */
 735         __le16  i_links_count;  /* Links count */
 736         __le32  i_blocks_lo;    /* Blocks count */
 737         __le32  i_flags;        /* File flags */
 738         union {
 739                 struct {
 740                         __le32  l_i_version;
 741                 } linux1;
 742                 struct {
 743                         __u32  h_i_translator;
 744                 } hurd1;
 745                 struct {
 746                         __u32  m_i_reserved1;
 747                 } masix1;
 748         } osd1;                         /* OS dependent 1 */
 749         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 750         __le32  i_generation;   /* File version (for NFS) */
 751         __le32  i_file_acl_lo;  /* File ACL */
 752         __le32  i_size_high;
 753         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 754         union {
 755                 struct {
 756                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 757                         __le16  l_i_file_acl_high;
 758                         __le16  l_i_uid_high;   /* these 2 fields */
 759                         __le16  l_i_gid_high;   /* were reserved2[0] */
 760                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 761                         __le16  l_i_reserved;
 762                 } linux2;
 763                 struct {
 764                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 765                         __u16   h_i_mode_high;
 766                         __u16   h_i_uid_high;
 767                         __u16   h_i_gid_high;
 768                         __u32   h_i_author;
 769                 } hurd2;
 770                 struct {
 771                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 772                         __le16  m_i_file_acl_high;
 773                         __u32   m_i_reserved2[2];
 774                 } masix2;
 775         } osd2;                         /* OS dependent 2 */
 776         __le16  i_extra_isize;
 777         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 778         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 779         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 780         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 781         __le32  i_crtime;       /* File Creation time */
 782         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 783         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 784         __le32  i_projid;       /* Project ID */
 785 };
 786 
 787 struct move_extent {
 788         __u32 reserved;         /* should be zero */
 789         __u32 donor_fd;         /* donor file descriptor */
 790         __u64 orig_start;       /* logical start offset in block for orig */
 791         __u64 donor_start;      /* logical start offset in block for donor */
 792         __u64 len;              /* block length to be moved */
 793         __u64 moved_len;        /* moved block length */
 794 };
 795 
 796 #define EXT4_EPOCH_BITS 2
 797 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 798 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 799 
 800 /*
 801  * Extended fields will fit into an inode if the filesystem was formatted
 802  * with large inodes (-I 256 or larger) and there are not currently any EAs
 803  * consuming all of the available space. For new inodes we always reserve
 804  * enough space for the kernel's known extended fields, but for inodes
 805  * created with an old kernel this might not have been the case. None of
 806  * the extended inode fields is critical for correct filesystem operation.
 807  * This macro checks if a certain field fits in the inode. Note that
 808  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 809  */
 810 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 811         ((offsetof(typeof(*ext4_inode), field) +        \
 812           sizeof((ext4_inode)->field))                  \
 813         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 814             (einode)->i_extra_isize))                   \
 815 
 816 /*
 817  * We use an encoding that preserves the times for extra epoch "00":
 818  *
 819  * extra  msb of                         adjust for signed
 820  * epoch  32-bit                         32-bit tv_sec to
 821  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 822  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 823  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 824  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 825  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 826  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 827  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 828  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 829  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 830  *
 831  * Note that previous versions of the kernel on 64-bit systems would
 832  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 833  * 1970.  e2fsck will correct this, assuming that it is run on the
 834  * affected filesystem before 2242.
 835  */
 836 
 837 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 838 {
 839         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 840         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 841 }
 842 
 843 static inline void ext4_decode_extra_time(struct timespec64 *time,
 844                                           __le32 extra)
 845 {
 846         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
 847                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 848         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 849 }
 850 
 851 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 852 do {                                                                            \
 853         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 854                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 855                 (raw_inode)->xtime ## _extra =                                  \
 856                                 ext4_encode_extra_time(&(inode)->xtime);        \
 857                 }                                                               \
 858         else    \
 859                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 860 } while (0)
 861 
 862 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 863 do {                                                                           \
 864         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 865                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 866         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 867                 (raw_inode)->xtime ## _extra =                                 \
 868                                 ext4_encode_extra_time(&(einode)->xtime);      \
 869 } while (0)
 870 
 871 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 872 do {                                                                            \
 873         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 874         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 875                 ext4_decode_extra_time(&(inode)->xtime,                         \
 876                                        raw_inode->xtime ## _extra);             \
 877                 }                                                               \
 878         else                                                                    \
 879                 (inode)->xtime.tv_nsec = 0;                                     \
 880 } while (0)
 881 
 882 
 883 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 884 do {                                                                           \
 885         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 886                 (einode)->xtime.tv_sec =                                       \
 887                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 888         else                                                                   \
 889                 (einode)->xtime.tv_sec = 0;                                    \
 890         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 891                 ext4_decode_extra_time(&(einode)->xtime,                       \
 892                                        raw_inode->xtime ## _extra);            \
 893         else                                                                   \
 894                 (einode)->xtime.tv_nsec = 0;                                   \
 895 } while (0)
 896 
 897 #define i_disk_version osd1.linux1.l_i_version
 898 
 899 #if defined(__KERNEL__) || defined(__linux__)
 900 #define i_reserved1     osd1.linux1.l_i_reserved1
 901 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 902 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 903 #define i_uid_low       i_uid
 904 #define i_gid_low       i_gid
 905 #define i_uid_high      osd2.linux2.l_i_uid_high
 906 #define i_gid_high      osd2.linux2.l_i_gid_high
 907 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 908 
 909 #elif defined(__GNU__)
 910 
 911 #define i_translator    osd1.hurd1.h_i_translator
 912 #define i_uid_high      osd2.hurd2.h_i_uid_high
 913 #define i_gid_high      osd2.hurd2.h_i_gid_high
 914 #define i_author        osd2.hurd2.h_i_author
 915 
 916 #elif defined(__masix__)
 917 
 918 #define i_reserved1     osd1.masix1.m_i_reserved1
 919 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 920 #define i_reserved2     osd2.masix2.m_i_reserved2
 921 
 922 #endif /* defined(__KERNEL__) || defined(__linux__) */
 923 
 924 #include "extents_status.h"
 925 
 926 /*
 927  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 928  *
 929  * These are needed to avoid lockdep false positives when we need to
 930  * allocate blocks to the quota inode during ext4_map_blocks(), while
 931  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 932  * do quota tracking for the quota inode, this avoids deadlock (as
 933  * well as infinite recursion, since it isn't turtles all the way
 934  * down...)
 935  *
 936  *  I_DATA_SEM_NORMAL - Used for most inodes
 937  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 938  *                        where the second inode has larger inode number
 939  *                        than the first
 940  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 941  */
 942 enum {
 943         I_DATA_SEM_NORMAL = 0,
 944         I_DATA_SEM_OTHER,
 945         I_DATA_SEM_QUOTA,
 946 };
 947 
 948 
 949 /*
 950  * fourth extended file system inode data in memory
 951  */
 952 struct ext4_inode_info {
 953         __le32  i_data[15];     /* unconverted */
 954         __u32   i_dtime;
 955         ext4_fsblk_t    i_file_acl;
 956 
 957         /*
 958          * i_block_group is the number of the block group which contains
 959          * this file's inode.  Constant across the lifetime of the inode,
 960          * it is used for making block allocation decisions - we try to
 961          * place a file's data blocks near its inode block, and new inodes
 962          * near to their parent directory's inode.
 963          */
 964         ext4_group_t    i_block_group;
 965         ext4_lblk_t     i_dir_start_lookup;
 966 #if (BITS_PER_LONG < 64)
 967         unsigned long   i_state_flags;          /* Dynamic state flags */
 968 #endif
 969         unsigned long   i_flags;
 970 
 971         /*
 972          * Extended attributes can be read independently of the main file
 973          * data. Taking i_mutex even when reading would cause contention
 974          * between readers of EAs and writers of regular file data, so
 975          * instead we synchronize on xattr_sem when reading or changing
 976          * EAs.
 977          */
 978         struct rw_semaphore xattr_sem;
 979 
 980         struct list_head i_orphan;      /* unlinked but open inodes */
 981 
 982         /*
 983          * i_disksize keeps track of what the inode size is ON DISK, not
 984          * in memory.  During truncate, i_size is set to the new size by
 985          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 986          * set i_disksize to 0 until the truncate is actually under way.
 987          *
 988          * The intent is that i_disksize always represents the blocks which
 989          * are used by this file.  This allows recovery to restart truncate
 990          * on orphans if we crash during truncate.  We actually write i_disksize
 991          * into the on-disk inode when writing inodes out, instead of i_size.
 992          *
 993          * The only time when i_disksize and i_size may be different is when
 994          * a truncate is in progress.  The only things which change i_disksize
 995          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 996          */
 997         loff_t  i_disksize;
 998 
 999         /*
1000          * i_data_sem is for serialising ext4_truncate() against
1001          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1002          * data tree are chopped off during truncate. We can't do that in
1003          * ext4 because whenever we perform intermediate commits during
1004          * truncate, the inode and all the metadata blocks *must* be in a
1005          * consistent state which allows truncation of the orphans to restart
1006          * during recovery.  Hence we must fix the get_block-vs-truncate race
1007          * by other means, so we have i_data_sem.
1008          */
1009         struct rw_semaphore i_data_sem;
1010         /*
1011          * i_mmap_sem is for serializing page faults with truncate / punch hole
1012          * operations. We have to make sure that new page cannot be faulted in
1013          * a section of the inode that is being punched. We cannot easily use
1014          * i_data_sem for this since we need protection for the whole punch
1015          * operation and i_data_sem ranks below transaction start so we have
1016          * to occasionally drop it.
1017          */
1018         struct rw_semaphore i_mmap_sem;
1019         struct inode vfs_inode;
1020         struct jbd2_inode *jinode;
1021 
1022         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1023 
1024         /*
1025          * File creation time. Its function is same as that of
1026          * struct timespec64 i_{a,c,m}time in the generic inode.
1027          */
1028         struct timespec64 i_crtime;
1029 
1030         /* mballoc */
1031         struct list_head i_prealloc_list;
1032         spinlock_t i_prealloc_lock;
1033 
1034         /* extents status tree */
1035         struct ext4_es_tree i_es_tree;
1036         rwlock_t i_es_lock;
1037         struct list_head i_es_list;
1038         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1039         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1040         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1041                                            extents to shrink. Protected by
1042                                            i_es_lock  */
1043 
1044         /* ialloc */
1045         ext4_group_t    i_last_alloc_group;
1046 
1047         /* allocation reservation info for delalloc */
1048         /* In case of bigalloc, this refer to clusters rather than blocks */
1049         unsigned int i_reserved_data_blocks;
1050         ext4_lblk_t i_da_metadata_calc_last_lblock;
1051         int i_da_metadata_calc_len;
1052 
1053         /* pending cluster reservations for bigalloc file systems */
1054         struct ext4_pending_tree i_pending_tree;
1055 
1056         /* on-disk additional length */
1057         __u16 i_extra_isize;
1058 
1059         /* Indicate the inline data space. */
1060         u16 i_inline_off;
1061         u16 i_inline_size;
1062 
1063 #ifdef CONFIG_QUOTA
1064         /* quota space reservation, managed internally by quota code */
1065         qsize_t i_reserved_quota;
1066 #endif
1067 
1068         /* Lock protecting lists below */
1069         spinlock_t i_completed_io_lock;
1070         /*
1071          * Completed IOs that need unwritten extents handling and have
1072          * transaction reserved
1073          */
1074         struct list_head i_rsv_conversion_list;
1075         struct work_struct i_rsv_conversion_work;
1076         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1077 
1078         spinlock_t i_block_reservation_lock;
1079 
1080         /*
1081          * Transactions that contain inode's metadata needed to complete
1082          * fsync and fdatasync, respectively.
1083          */
1084         tid_t i_sync_tid;
1085         tid_t i_datasync_tid;
1086 
1087 #ifdef CONFIG_QUOTA
1088         struct dquot *i_dquot[MAXQUOTAS];
1089 #endif
1090 
1091         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1092         __u32 i_csum_seed;
1093 
1094         kprojid_t i_projid;
1095 };
1096 
1097 /*
1098  * File system states
1099  */
1100 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1101 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1102 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1103 
1104 /*
1105  * Misc. filesystem flags
1106  */
1107 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1108 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1109 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1110 
1111 /*
1112  * Mount flags set via mount options or defaults
1113  */
1114 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1115 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1116 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1117 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1118 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1119 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1120 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1121 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1122 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1123 #ifdef CONFIG_FS_DAX
1124 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1125 #else
1126 #define EXT4_MOUNT_DAX                  0
1127 #endif
1128 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1129 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1130 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1131 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1132 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1133 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1134 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1135 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1136 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1137 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1138 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1139 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1140                                                  * enable enforcement for hidden
1141                                                  * quota files */
1142 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1143                                                   * enforcement for hidden quota
1144                                                   * files */
1145 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1146                                                   * enforcement */
1147 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1148 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1149 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1150 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1151 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1152 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1153 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1154 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1155 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1156 
1157 /*
1158  * Mount flags set either automatically (could not be set by mount option)
1159  * based on per file system feature or property or in special cases such as
1160  * distinguishing between explicit mount option definition and default.
1161  */
1162 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1163                                                       specified delalloc */
1164 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1165                                                       size of blocksize * 8
1166                                                       blocks */
1167 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1168                                                       file systems */
1169 
1170 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1171                                                 specified journal checksum */
1172 
1173 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1174                                                 ~EXT4_MOUNT_##opt
1175 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1176                                                 EXT4_MOUNT_##opt
1177 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1178                                          EXT4_MOUNT_##opt)
1179 
1180 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1181                                                 ~EXT4_MOUNT2_##opt
1182 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1183                                                 EXT4_MOUNT2_##opt
1184 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1185                                          EXT4_MOUNT2_##opt)
1186 
1187 #define ext4_test_and_set_bit           __test_and_set_bit_le
1188 #define ext4_set_bit                    __set_bit_le
1189 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1190 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1191 #define ext4_clear_bit                  __clear_bit_le
1192 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1193 #define ext4_test_bit                   test_bit_le
1194 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1195 #define ext4_find_next_bit              find_next_bit_le
1196 
1197 extern void ext4_set_bits(void *bm, int cur, int len);
1198 
1199 /*
1200  * Maximal mount counts between two filesystem checks
1201  */
1202 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1203 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1204 
1205 /*
1206  * Behaviour when detecting errors
1207  */
1208 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1209 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1210 #define EXT4_ERRORS_PANIC               3       /* Panic */
1211 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1212 
1213 /* Metadata checksum algorithm codes */
1214 #define EXT4_CRC32C_CHKSUM              1
1215 
1216 /*
1217  * Structure of the super block
1218  */
1219 struct ext4_super_block {
1220 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1221         __le32  s_blocks_count_lo;      /* Blocks count */
1222         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1223         __le32  s_free_blocks_count_lo; /* Free blocks count */
1224 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1225         __le32  s_first_data_block;     /* First Data Block */
1226         __le32  s_log_block_size;       /* Block size */
1227         __le32  s_log_cluster_size;     /* Allocation cluster size */
1228 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1229         __le32  s_clusters_per_group;   /* # Clusters per group */
1230         __le32  s_inodes_per_group;     /* # Inodes per group */
1231         __le32  s_mtime;                /* Mount time */
1232 /*30*/  __le32  s_wtime;                /* Write time */
1233         __le16  s_mnt_count;            /* Mount count */
1234         __le16  s_max_mnt_count;        /* Maximal mount count */
1235         __le16  s_magic;                /* Magic signature */
1236         __le16  s_state;                /* File system state */
1237         __le16  s_errors;               /* Behaviour when detecting errors */
1238         __le16  s_minor_rev_level;      /* minor revision level */
1239 /*40*/  __le32  s_lastcheck;            /* time of last check */
1240         __le32  s_checkinterval;        /* max. time between checks */
1241         __le32  s_creator_os;           /* OS */
1242         __le32  s_rev_level;            /* Revision level */
1243 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1244         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1245         /*
1246          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1247          *
1248          * Note: the difference between the compatible feature set and
1249          * the incompatible feature set is that if there is a bit set
1250          * in the incompatible feature set that the kernel doesn't
1251          * know about, it should refuse to mount the filesystem.
1252          *
1253          * e2fsck's requirements are more strict; if it doesn't know
1254          * about a feature in either the compatible or incompatible
1255          * feature set, it must abort and not try to meddle with
1256          * things it doesn't understand...
1257          */
1258         __le32  s_first_ino;            /* First non-reserved inode */
1259         __le16  s_inode_size;           /* size of inode structure */
1260         __le16  s_block_group_nr;       /* block group # of this superblock */
1261         __le32  s_feature_compat;       /* compatible feature set */
1262 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1263         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1264 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1265 /*78*/  char    s_volume_name[16];      /* volume name */
1266 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1267 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1268         /*
1269          * Performance hints.  Directory preallocation should only
1270          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1271          */
1272         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1273         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1274         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1275         /*
1276          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1277          */
1278 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1279 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1280         __le32  s_journal_dev;          /* device number of journal file */
1281         __le32  s_last_orphan;          /* start of list of inodes to delete */
1282         __le32  s_hash_seed[4];         /* HTREE hash seed */
1283         __u8    s_def_hash_version;     /* Default hash version to use */
1284         __u8    s_jnl_backup_type;
1285         __le16  s_desc_size;            /* size of group descriptor */
1286 /*100*/ __le32  s_default_mount_opts;
1287         __le32  s_first_meta_bg;        /* First metablock block group */
1288         __le32  s_mkfs_time;            /* When the filesystem was created */
1289         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1290         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1291 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1292         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1293         __le32  s_free_blocks_count_hi; /* Free blocks count */
1294         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1295         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1296         __le32  s_flags;                /* Miscellaneous flags */
1297         __le16  s_raid_stride;          /* RAID stride */
1298         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1299         __le64  s_mmp_block;            /* Block for multi-mount protection */
1300         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1301         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1302         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1303         __u8    s_encryption_level;     /* versioning level for encryption */
1304         __u8    s_reserved_pad;         /* Padding to next 32bits */
1305         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1306         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1307         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1308         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1309                                               snapshot's future use */
1310         __le32  s_snapshot_list;        /* inode number of the head of the
1311                                            on-disk snapshot list */
1312 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1313         __le32  s_error_count;          /* number of fs errors */
1314         __le32  s_first_error_time;     /* first time an error happened */
1315         __le32  s_first_error_ino;      /* inode involved in first error */
1316         __le64  s_first_error_block;    /* block involved of first error */
1317         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1318         __le32  s_first_error_line;     /* line number where error happened */
1319         __le32  s_last_error_time;      /* most recent time of an error */
1320         __le32  s_last_error_ino;       /* inode involved in last error */
1321         __le32  s_last_error_line;      /* line number where error happened */
1322         __le64  s_last_error_block;     /* block involved of last error */
1323         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1324 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1325         __u8    s_mount_opts[64];
1326         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1327         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1328         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1329         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1330         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1331         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1332         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1333         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1334         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1335         __u8    s_wtime_hi;
1336         __u8    s_mtime_hi;
1337         __u8    s_mkfs_time_hi;
1338         __u8    s_lastcheck_hi;
1339         __u8    s_first_error_time_hi;
1340         __u8    s_last_error_time_hi;
1341         __u8    s_pad[2];
1342         __le16  s_encoding;             /* Filename charset encoding */
1343         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1344         __le32  s_reserved[95];         /* Padding to the end of the block */
1345         __le32  s_checksum;             /* crc32c(superblock) */
1346 };
1347 
1348 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1349 
1350 #ifdef __KERNEL__
1351 
1352 /*
1353  * run-time mount flags
1354  */
1355 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1356 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1357 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1358 
1359 #ifdef CONFIG_FS_ENCRYPTION
1360 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1361                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1362 #else
1363 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1364 #endif
1365 
1366 /* Number of quota types we support */
1367 #define EXT4_MAXQUOTAS 3
1368 
1369 #define EXT4_ENC_UTF8_12_1      1
1370 
1371 /*
1372  * Flags for ext4_sb_info.s_encoding_flags.
1373  */
1374 #define EXT4_ENC_STRICT_MODE_FL (1 << 0)
1375 
1376 #define ext4_has_strict_mode(sbi) \
1377         (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
1378 
1379 /*
1380  * fourth extended-fs super-block data in memory
1381  */
1382 struct ext4_sb_info {
1383         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1384         unsigned long s_inodes_per_block;/* Number of inodes per block */
1385         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1386         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1387         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1388         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1389         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1390         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1391         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1392         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1393         unsigned long s_overhead;  /* # of fs overhead clusters */
1394         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1395         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1396         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1397         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1398         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1399         struct buffer_head * __rcu *s_group_desc;
1400         unsigned int s_mount_opt;
1401         unsigned int s_mount_opt2;
1402         unsigned int s_mount_flags;
1403         unsigned int s_def_mount_opt;
1404         ext4_fsblk_t s_sb_block;
1405         atomic64_t s_resv_clusters;
1406         kuid_t s_resuid;
1407         kgid_t s_resgid;
1408         unsigned short s_mount_state;
1409         unsigned short s_pad;
1410         int s_addr_per_block_bits;
1411         int s_desc_per_block_bits;
1412         int s_inode_size;
1413         int s_first_ino;
1414         unsigned int s_inode_readahead_blks;
1415         unsigned int s_inode_goal;
1416         u32 s_hash_seed[4];
1417         int s_def_hash_version;
1418         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1419         struct percpu_counter s_freeclusters_counter;
1420         struct percpu_counter s_freeinodes_counter;
1421         struct percpu_counter s_dirs_counter;
1422         struct percpu_counter s_dirtyclusters_counter;
1423         struct blockgroup_lock *s_blockgroup_lock;
1424         struct proc_dir_entry *s_proc;
1425         struct kobject s_kobj;
1426         struct completion s_kobj_unregister;
1427         struct super_block *s_sb;
1428 #ifdef CONFIG_UNICODE
1429         struct unicode_map *s_encoding;
1430         __u16 s_encoding_flags;
1431 #endif
1432 
1433         /* Journaling */
1434         struct journal_s *s_journal;
1435         struct list_head s_orphan;
1436         struct mutex s_orphan_lock;
1437         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1438         unsigned long s_commit_interval;
1439         u32 s_max_batch_time;
1440         u32 s_min_batch_time;
1441         struct block_device *journal_bdev;
1442 #ifdef CONFIG_QUOTA
1443         /* Names of quota files with journalled quota */
1444         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1445         int s_jquota_fmt;                       /* Format of quota to use */
1446 #endif
1447         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1448         struct ext4_system_blocks __rcu *system_blks;
1449 
1450 #ifdef EXTENTS_STATS
1451         /* ext4 extents stats */
1452         unsigned long s_ext_min;
1453         unsigned long s_ext_max;
1454         unsigned long s_depth_max;
1455         spinlock_t s_ext_stats_lock;
1456         unsigned long s_ext_blocks;
1457         unsigned long s_ext_extents;
1458 #endif
1459 
1460         /* for buddy allocator */
1461         struct ext4_group_info ** __rcu *s_group_info;
1462         struct inode *s_buddy_cache;
1463         spinlock_t s_md_lock;
1464         unsigned short *s_mb_offsets;
1465         unsigned int *s_mb_maxs;
1466         unsigned int s_group_info_size;
1467         unsigned int s_mb_free_pending;
1468         struct list_head s_freed_data_list;     /* List of blocks to be freed
1469                                                    after commit completed */
1470 
1471         /* tunables */
1472         unsigned long s_stripe;
1473         unsigned int s_mb_stream_request;
1474         unsigned int s_mb_max_to_scan;
1475         unsigned int s_mb_min_to_scan;
1476         unsigned int s_mb_stats;
1477         unsigned int s_mb_order2_reqs;
1478         unsigned int s_mb_group_prealloc;
1479         unsigned int s_max_dir_size_kb;
1480         /* where last allocation was done - for stream allocation */
1481         unsigned long s_mb_last_group;
1482         unsigned long s_mb_last_start;
1483 
1484         /* stats for buddy allocator */
1485         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1486         atomic_t s_bal_success; /* we found long enough chunks */
1487         atomic_t s_bal_allocated;       /* in blocks */
1488         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1489         atomic_t s_bal_goals;   /* goal hits */
1490         atomic_t s_bal_breaks;  /* too long searches */
1491         atomic_t s_bal_2orders; /* 2^order hits */
1492         spinlock_t s_bal_lock;
1493         unsigned long s_mb_buddies_generated;
1494         unsigned long long s_mb_generation_time;
1495         atomic_t s_mb_lost_chunks;
1496         atomic_t s_mb_preallocated;
1497         atomic_t s_mb_discarded;
1498         atomic_t s_lock_busy;
1499 
1500         /* locality groups */
1501         struct ext4_locality_group __percpu *s_locality_groups;
1502 
1503         /* for write statistics */
1504         unsigned long s_sectors_written_start;
1505         u64 s_kbytes_written;
1506 
1507         /* the size of zero-out chunk */
1508         unsigned int s_extent_max_zeroout_kb;
1509 
1510         unsigned int s_log_groups_per_flex;
1511         struct flex_groups * __rcu *s_flex_groups;
1512         ext4_group_t s_flex_groups_allocated;
1513 
1514         /* workqueue for reserved extent conversions (buffered io) */
1515         struct workqueue_struct *rsv_conversion_wq;
1516 
1517         /* timer for periodic error stats printing */
1518         struct timer_list s_err_report;
1519 
1520         /* Lazy inode table initialization info */
1521         struct ext4_li_request *s_li_request;
1522         /* Wait multiplier for lazy initialization thread */
1523         unsigned int s_li_wait_mult;
1524 
1525         /* Kernel thread for multiple mount protection */
1526         struct task_struct *s_mmp_tsk;
1527 
1528         /* record the last minlen when FITRIM is called. */
1529         atomic_t s_last_trim_minblks;
1530 
1531         /* Reference to checksum algorithm driver via cryptoapi */
1532         struct crypto_shash *s_chksum_driver;
1533 
1534         /* Precomputed FS UUID checksum for seeding other checksums */
1535         __u32 s_csum_seed;
1536 
1537         /* Reclaim extents from extent status tree */
1538         struct shrinker s_es_shrinker;
1539         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1540         long s_es_nr_inode;
1541         struct ext4_es_stats s_es_stats;
1542         struct mb_cache *s_ea_block_cache;
1543         struct mb_cache *s_ea_inode_cache;
1544         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1545 
1546         /* Ratelimit ext4 messages. */
1547         struct ratelimit_state s_err_ratelimit_state;
1548         struct ratelimit_state s_warning_ratelimit_state;
1549         struct ratelimit_state s_msg_ratelimit_state;
1550 
1551         /*
1552          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1553          * or EXTENTS flag.
1554          */
1555         struct percpu_rw_semaphore s_writepages_rwsem;
1556         struct dax_device *s_daxdev;
1557 };
1558 
1559 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1560 {
1561         return sb->s_fs_info;
1562 }
1563 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1564 {
1565         return container_of(inode, struct ext4_inode_info, vfs_inode);
1566 }
1567 
1568 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1569 {
1570         return ino == EXT4_ROOT_INO ||
1571                 (ino >= EXT4_FIRST_INO(sb) &&
1572                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1573 }
1574 
1575 /*
1576  * Returns: sbi->field[index]
1577  * Used to access an array element from the following sbi fields which require
1578  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1579  * - s_group_desc
1580  * - s_group_info
1581  * - s_flex_group
1582  */
1583 #define sbi_array_rcu_deref(sbi, field, index)                             \
1584 ({                                                                         \
1585         typeof(*((sbi)->field)) _v;                                        \
1586         rcu_read_lock();                                                   \
1587         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1588         rcu_read_unlock();                                                 \
1589         _v;                                                                \
1590 })
1591 
1592 /*
1593  * Inode dynamic state flags
1594  */
1595 enum {
1596         EXT4_STATE_JDATA,               /* journaled data exists */
1597         EXT4_STATE_NEW,                 /* inode is newly created */
1598         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1599         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1600         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1601         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1602         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1603         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1604         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1605         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1606         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1607         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1608 };
1609 
1610 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1611 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1612 {                                                                       \
1613         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1614 }                                                                       \
1615 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1616 {                                                                       \
1617         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1618 }                                                                       \
1619 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1620 {                                                                       \
1621         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1622 }
1623 
1624 /* Add these declarations here only so that these functions can be
1625  * found by name.  Otherwise, they are very hard to locate. */
1626 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1627 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1628 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1629 EXT4_INODE_BIT_FNS(flag, flags, 0)
1630 
1631 /* Add these declarations here only so that these functions can be
1632  * found by name.  Otherwise, they are very hard to locate. */
1633 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1634 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1635 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1636 #if (BITS_PER_LONG < 64)
1637 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1638 
1639 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1640 {
1641         (ei)->i_state_flags = 0;
1642 }
1643 #else
1644 EXT4_INODE_BIT_FNS(state, flags, 32)
1645 
1646 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1647 {
1648         /* We depend on the fact that callers will set i_flags */
1649 }
1650 #endif
1651 #else
1652 /* Assume that user mode programs are passing in an ext4fs superblock, not
1653  * a kernel struct super_block.  This will allow us to call the feature-test
1654  * macros from user land. */
1655 #define EXT4_SB(sb)     (sb)
1656 #endif
1657 
1658 static inline bool ext4_verity_in_progress(struct inode *inode)
1659 {
1660         return IS_ENABLED(CONFIG_FS_VERITY) &&
1661                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1662 }
1663 
1664 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1665 
1666 /*
1667  * Codes for operating systems
1668  */
1669 #define EXT4_OS_LINUX           0
1670 #define EXT4_OS_HURD            1
1671 #define EXT4_OS_MASIX           2
1672 #define EXT4_OS_FREEBSD         3
1673 #define EXT4_OS_LITES           4
1674 
1675 /*
1676  * Revision levels
1677  */
1678 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1679 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1680 
1681 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1682 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1683 
1684 #define EXT4_GOOD_OLD_INODE_SIZE 128
1685 
1686 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1687 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1688 #define EXT4_TIMESTAMP_MIN              S32_MIN
1689 
1690 /*
1691  * Feature set definitions
1692  */
1693 
1694 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1695 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1696 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1697 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1698 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1699 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1700 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1701 
1702 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1703 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1704 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1705 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1706 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1707 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1708 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1709 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1710 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1711 /*
1712  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1713  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1714  * all other data structures' checksums.  However, the METADATA_CSUM and
1715  * GDT_CSUM bits are mutually exclusive.
1716  */
1717 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1718 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1719 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1720 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
1721 
1722 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1723 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1724 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1725 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1726 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1727 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1728 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1729 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1730 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1731 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1732 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1733 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1734 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1735 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1736 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1737 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
1738 
1739 extern void ext4_update_dynamic_rev(struct super_block *sb);
1740 
1741 #define EXT4_FEATURE_COMPAT_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_compat & \
1745                 cpu_to_le32(EXT4_FEATURE_COMPAT_##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_compat |= \
1751                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1752 } \
1753 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1754 { \
1755         EXT4_SB(sb)->s_es->s_feature_compat &= \
1756                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1757 }
1758 
1759 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1760 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1761 { \
1762         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1763                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1764 } \
1765 static inline void ext4_set_feature_##name(struct super_block *sb) \
1766 { \
1767         ext4_update_dynamic_rev(sb); \
1768         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1769                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1770 } \
1771 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1772 { \
1773         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1774                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1775 }
1776 
1777 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1778 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1779 { \
1780         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1781                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1782 } \
1783 static inline void ext4_set_feature_##name(struct super_block *sb) \
1784 { \
1785         ext4_update_dynamic_rev(sb); \
1786         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1787                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1788 } \
1789 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1790 { \
1791         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1792                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1793 }
1794 
1795 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1796 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1797 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1798 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1799 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1800 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1801 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1802 
1803 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1804 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1805 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1806 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1807 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1808 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1809 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1810 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1811 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1812 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1813 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1814 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1815 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
1816 
1817 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1818 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1819 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1820 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1821 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1822 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1823 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1824 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1825 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1826 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1827 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1828 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1829 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1830 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1831 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1832 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
1833 
1834 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1835 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1836                                          EXT4_FEATURE_INCOMPAT_META_BG)
1837 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1838                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1839                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1840 
1841 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1842 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1843                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1844                                          EXT4_FEATURE_INCOMPAT_META_BG)
1845 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1846                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1847                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1848 
1849 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1850 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1851                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1852                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1853                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1854                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1855                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1856                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1857                                          EXT4_FEATURE_INCOMPAT_MMP | \
1858                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1859                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1860                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
1861                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1862                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1863 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1864                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1865                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1866                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1867                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1868                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1869                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1870                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1871                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1872                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1873                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
1874                                          EXT4_FEATURE_RO_COMPAT_VERITY)
1875 
1876 #define EXTN_FEATURE_FUNCS(ver) \
1877 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1878 { \
1879         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1880                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1881 } \
1882 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1883 { \
1884         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1885                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1886 } \
1887 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1888 { \
1889         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1890                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1891 }
1892 
1893 EXTN_FEATURE_FUNCS(2)
1894 EXTN_FEATURE_FUNCS(3)
1895 EXTN_FEATURE_FUNCS(4)
1896 
1897 static inline bool ext4_has_compat_features(struct super_block *sb)
1898 {
1899         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1900 }
1901 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1902 {
1903         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1904 }
1905 static inline bool ext4_has_incompat_features(struct super_block *sb)
1906 {
1907         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1908 }
1909 
1910 /*
1911  * Superblock flags
1912  */
1913 #define EXT4_FLAGS_RESIZING     0
1914 #define EXT4_FLAGS_SHUTDOWN     1
1915 
1916 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1917 {
1918         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1919 }
1920 
1921 
1922 /*
1923  * Default values for user and/or group using reserved blocks
1924  */
1925 #define EXT4_DEF_RESUID         0
1926 #define EXT4_DEF_RESGID         0
1927 
1928 /*
1929  * Default project ID
1930  */
1931 #define EXT4_DEF_PROJID         0
1932 
1933 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1934 
1935 /*
1936  * Default mount options
1937  */
1938 #define EXT4_DEFM_DEBUG         0x0001
1939 #define EXT4_DEFM_BSDGROUPS     0x0002
1940 #define EXT4_DEFM_XATTR_USER    0x0004
1941 #define EXT4_DEFM_ACL           0x0008
1942 #define EXT4_DEFM_UID16         0x0010
1943 #define EXT4_DEFM_JMODE         0x0060
1944 #define EXT4_DEFM_JMODE_DATA    0x0020
1945 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1946 #define EXT4_DEFM_JMODE_WBACK   0x0060
1947 #define EXT4_DEFM_NOBARRIER     0x0100
1948 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1949 #define EXT4_DEFM_DISCARD       0x0400
1950 #define EXT4_DEFM_NODELALLOC    0x0800
1951 
1952 /*
1953  * Default journal batch times
1954  */
1955 #define EXT4_DEF_MIN_BATCH_TIME 0
1956 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1957 
1958 /*
1959  * Minimum number of groups in a flexgroup before we separate out
1960  * directories into the first block group of a flexgroup
1961  */
1962 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1963 
1964 /*
1965  * Structure of a directory entry
1966  */
1967 #define EXT4_NAME_LEN 255
1968 
1969 struct ext4_dir_entry {
1970         __le32  inode;                  /* Inode number */
1971         __le16  rec_len;                /* Directory entry length */
1972         __le16  name_len;               /* Name length */
1973         char    name[EXT4_NAME_LEN];    /* File name */
1974 };
1975 
1976 /*
1977  * The new version of the directory entry.  Since EXT4 structures are
1978  * stored in intel byte order, and the name_len field could never be
1979  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1980  * file_type field.
1981  */
1982 struct ext4_dir_entry_2 {
1983         __le32  inode;                  /* Inode number */
1984         __le16  rec_len;                /* Directory entry length */
1985         __u8    name_len;               /* Name length */
1986         __u8    file_type;
1987         char    name[EXT4_NAME_LEN];    /* File name */
1988 };
1989 
1990 /*
1991  * This is a bogus directory entry at the end of each leaf block that
1992  * records checksums.
1993  */
1994 struct ext4_dir_entry_tail {
1995         __le32  det_reserved_zero1;     /* Pretend to be unused */
1996         __le16  det_rec_len;            /* 12 */
1997         __u8    det_reserved_zero2;     /* Zero name length */
1998         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1999         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
2000 };
2001 
2002 #define EXT4_DIRENT_TAIL(block, blocksize) \
2003         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2004                                         ((blocksize) - \
2005                                          sizeof(struct ext4_dir_entry_tail))))
2006 
2007 /*
2008  * Ext4 directory file types.  Only the low 3 bits are used.  The
2009  * other bits are reserved for now.
2010  */
2011 #define EXT4_FT_UNKNOWN         0
2012 #define EXT4_FT_REG_FILE        1
2013 #define EXT4_FT_DIR             2
2014 #define EXT4_FT_CHRDEV          3
2015 #define EXT4_FT_BLKDEV          4
2016 #define EXT4_FT_FIFO            5
2017 #define EXT4_FT_SOCK            6
2018 #define EXT4_FT_SYMLINK         7
2019 
2020 #define EXT4_FT_MAX             8
2021 
2022 #define EXT4_FT_DIR_CSUM        0xDE
2023 
2024 /*
2025  * EXT4_DIR_PAD defines the directory entries boundaries
2026  *
2027  * NOTE: It must be a multiple of 4
2028  */
2029 #define EXT4_DIR_PAD                    4
2030 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2031 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
2032                                          ~EXT4_DIR_ROUND)
2033 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2034 
2035 /*
2036  * If we ever get support for fs block sizes > page_size, we'll need
2037  * to remove the #if statements in the next two functions...
2038  */
2039 static inline unsigned int
2040 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2041 {
2042         unsigned len = le16_to_cpu(dlen);
2043 
2044 #if (PAGE_SIZE >= 65536)
2045         if (len == EXT4_MAX_REC_LEN || len == 0)
2046                 return blocksize;
2047         return (len & 65532) | ((len & 3) << 16);
2048 #else
2049         return len;
2050 #endif
2051 }
2052 
2053 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2054 {
2055         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2056                 BUG();
2057 #if (PAGE_SIZE >= 65536)
2058         if (len < 65536)
2059                 return cpu_to_le16(len);
2060         if (len == blocksize) {
2061                 if (blocksize == 65536)
2062                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2063                 else
2064                         return cpu_to_le16(0);
2065         }
2066         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2067 #else
2068         return cpu_to_le16(len);
2069 #endif
2070 }
2071 
2072 /*
2073  * Hash Tree Directory indexing
2074  * (c) Daniel Phillips, 2001
2075  */
2076 
2077 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2078                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2079 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2080                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2081 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2082 
2083 /* Legal values for the dx_root hash_version field: */
2084 
2085 #define DX_HASH_LEGACY                  0
2086 #define DX_HASH_HALF_MD4                1
2087 #define DX_HASH_TEA                     2
2088 #define DX_HASH_LEGACY_UNSIGNED         3
2089 #define DX_HASH_HALF_MD4_UNSIGNED       4
2090 #define DX_HASH_TEA_UNSIGNED            5
2091 
2092 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2093                               const void *address, unsigned int length)
2094 {
2095         struct {
2096                 struct shash_desc shash;
2097                 char ctx[4];
2098         } desc;
2099 
2100         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2101 
2102         desc.shash.tfm = sbi->s_chksum_driver;
2103         *(u32 *)desc.ctx = crc;
2104 
2105         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2106 
2107         return *(u32 *)desc.ctx;
2108 }
2109 
2110 #ifdef __KERNEL__
2111 
2112 /* hash info structure used by the directory hash */
2113 struct dx_hash_info
2114 {
2115         u32             hash;
2116         u32             minor_hash;
2117         int             hash_version;
2118         u32             *seed;
2119 };
2120 
2121 
2122 /* 32 and 64 bit signed EOF for dx directories */
2123 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2124 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2125 
2126 
2127 /*
2128  * Control parameters used by ext4_htree_next_block
2129  */
2130 #define HASH_NB_ALWAYS          1
2131 
2132 struct ext4_filename {
2133         const struct qstr *usr_fname;
2134         struct fscrypt_str disk_name;
2135         struct dx_hash_info hinfo;
2136 #ifdef CONFIG_FS_ENCRYPTION
2137         struct fscrypt_str crypto_buf;
2138 #endif
2139 #ifdef CONFIG_UNICODE
2140         struct fscrypt_str cf_name;
2141 #endif
2142 };
2143 
2144 #define fname_name(p) ((p)->disk_name.name)
2145 #define fname_len(p)  ((p)->disk_name.len)
2146 
2147 /*
2148  * Describe an inode's exact location on disk and in memory
2149  */
2150 struct ext4_iloc
2151 {
2152         struct buffer_head *bh;
2153         unsigned long offset;
2154         ext4_group_t block_group;
2155 };
2156 
2157 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2158 {
2159         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2160 }
2161 
2162 static inline bool ext4_is_quota_file(struct inode *inode)
2163 {
2164         return IS_NOQUOTA(inode) &&
2165                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2166 }
2167 
2168 /*
2169  * This structure is stuffed into the struct file's private_data field
2170  * for directories.  It is where we put information so that we can do
2171  * readdir operations in hash tree order.
2172  */
2173 struct dir_private_info {
2174         struct rb_root  root;
2175         struct rb_node  *curr_node;
2176         struct fname    *extra_fname;
2177         loff_t          last_pos;
2178         __u32           curr_hash;
2179         __u32           curr_minor_hash;
2180         __u32           next_hash;
2181 };
2182 
2183 /* calculate the first block number of the group */
2184 static inline ext4_fsblk_t
2185 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2186 {
2187         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2188                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2189 }
2190 
2191 /*
2192  * Special error return code only used by dx_probe() and its callers.
2193  */
2194 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2195 
2196 /* htree levels for ext4 */
2197 #define EXT4_HTREE_LEVEL_COMPAT 2
2198 #define EXT4_HTREE_LEVEL        3
2199 
2200 static inline int ext4_dir_htree_level(struct super_block *sb)
2201 {
2202         return ext4_has_feature_largedir(sb) ?
2203                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2204 }
2205 
2206 /*
2207  * Timeout and state flag for lazy initialization inode thread.
2208  */
2209 #define EXT4_DEF_LI_WAIT_MULT                   10
2210 #define EXT4_DEF_LI_MAX_START_DELAY             5
2211 #define EXT4_LAZYINIT_QUIT                      0x0001
2212 #define EXT4_LAZYINIT_RUNNING                   0x0002
2213 
2214 /*
2215  * Lazy inode table initialization info
2216  */
2217 struct ext4_lazy_init {
2218         unsigned long           li_state;
2219         struct list_head        li_request_list;
2220         struct mutex            li_list_mtx;
2221 };
2222 
2223 struct ext4_li_request {
2224         struct super_block      *lr_super;
2225         struct ext4_sb_info     *lr_sbi;
2226         ext4_group_t            lr_next_group;
2227         struct list_head        lr_request;
2228         unsigned long           lr_next_sched;
2229         unsigned long           lr_timeout;
2230 };
2231 
2232 struct ext4_features {
2233         struct kobject f_kobj;
2234         struct completion f_kobj_unregister;
2235 };
2236 
2237 /*
2238  * This structure will be used for multiple mount protection. It will be
2239  * written into the block number saved in the s_mmp_block field in the
2240  * superblock. Programs that check MMP should assume that if
2241  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2242  * to use the filesystem, regardless of how old the timestamp is.
2243  */
2244 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2245 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2246 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2247 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2248 
2249 struct mmp_struct {
2250         __le32  mmp_magic;              /* Magic number for MMP */
2251         __le32  mmp_seq;                /* Sequence no. updated periodically */
2252 
2253         /*
2254          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2255          * purposes and do not affect the correctness of the algorithm
2256          */
2257         __le64  mmp_time;               /* Time last updated */
2258         char    mmp_nodename[64];       /* Node which last updated MMP block */
2259         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2260 
2261         /*
2262          * mmp_check_interval is used to verify if the MMP block has been
2263          * updated on the block device. The value is updated based on the
2264          * maximum time to write the MMP block during an update cycle.
2265          */
2266         __le16  mmp_check_interval;
2267 
2268         __le16  mmp_pad1;
2269         __le32  mmp_pad2[226];
2270         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2271 };
2272 
2273 /* arguments passed to the mmp thread */
2274 struct mmpd_data {
2275         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2276         struct super_block *sb;  /* super block of the fs */
2277 };
2278 
2279 /*
2280  * Check interval multiplier
2281  * The MMP block is written every update interval and initially checked every
2282  * update interval x the multiplier (the value is then adapted based on the
2283  * write latency). The reason is that writes can be delayed under load and we
2284  * don't want readers to incorrectly assume that the filesystem is no longer
2285  * in use.
2286  */
2287 #define EXT4_MMP_CHECK_MULT             2UL
2288 
2289 /*
2290  * Minimum interval for MMP checking in seconds.
2291  */
2292 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2293 
2294 /*
2295  * Maximum interval for MMP checking in seconds.
2296  */
2297 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2298 
2299 /*
2300  * Function prototypes
2301  */
2302 
2303 /*
2304  * Ok, these declarations are also in <linux/kernel.h> but none of the
2305  * ext4 source programs needs to include it so they are duplicated here.
2306  */
2307 # define NORET_TYPE     /**/
2308 # define ATTRIB_NORET   __attribute__((noreturn))
2309 # define NORET_AND      noreturn,
2310 
2311 /* bitmap.c */
2312 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2313 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2314                                 struct ext4_group_desc *gdp,
2315                                 struct buffer_head *bh, int sz);
2316 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2317                                   struct ext4_group_desc *gdp,
2318                                   struct buffer_head *bh, int sz);
2319 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2320                                 struct ext4_group_desc *gdp,
2321                                 struct buffer_head *bh);
2322 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2323                                   struct ext4_group_desc *gdp,
2324                                   struct buffer_head *bh);
2325 
2326 /* balloc.c */
2327 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2328                                          ext4_fsblk_t blocknr,
2329                                          ext4_group_t *blockgrpp,
2330                                          ext4_grpblk_t *offsetp);
2331 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2332                                           ext4_fsblk_t block);
2333 
2334 extern unsigned int ext4_block_group(struct super_block *sb,
2335                         ext4_fsblk_t blocknr);
2336 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2337                         ext4_fsblk_t blocknr);
2338 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2339 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2340                         ext4_group_t group);
2341 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2342                                          ext4_fsblk_t goal,
2343                                          unsigned int flags,
2344                                          unsigned long *count,
2345                                          int *errp);
2346 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2347                                     s64 nclusters, unsigned int flags);
2348 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2349 extern void ext4_check_blocks_bitmap(struct super_block *);
2350 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2351                                                     ext4_group_t block_group,
2352                                                     struct buffer_head ** bh);
2353 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2354 
2355 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2356                                                 ext4_group_t block_group);
2357 extern int ext4_wait_block_bitmap(struct super_block *sb,
2358                                   ext4_group_t block_group,
2359                                   struct buffer_head *bh);
2360 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2361                                                   ext4_group_t block_group);
2362 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2363                                               ext4_group_t block_group,
2364                                               struct ext4_group_desc *gdp);
2365 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2366 
2367 #ifdef CONFIG_UNICODE
2368 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2369                                          const struct qstr *iname,
2370                                          struct fscrypt_str *fname);
2371 #endif
2372 
2373 #ifdef CONFIG_FS_ENCRYPTION
2374 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2375                                                 const struct fscrypt_name *src)
2376 {
2377         memset(dst, 0, sizeof(*dst));
2378 
2379         dst->usr_fname = src->usr_fname;
2380         dst->disk_name = src->disk_name;
2381         dst->hinfo.hash = src->hash;
2382         dst->hinfo.minor_hash = src->minor_hash;
2383         dst->crypto_buf = src->crypto_buf;
2384 }
2385 
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         struct fscrypt_name name;
2392         int err;
2393 
2394         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2395         if (err)
2396                 return err;
2397 
2398         ext4_fname_from_fscrypt_name(fname, &name);
2399 
2400 #ifdef CONFIG_UNICODE
2401         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2402 #endif
2403         return 0;
2404 }
2405 
2406 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2407                                             struct dentry *dentry,
2408                                             struct ext4_filename *fname)
2409 {
2410         struct fscrypt_name name;
2411         int err;
2412 
2413         err = fscrypt_prepare_lookup(dir, dentry, &name);
2414         if (err)
2415                 return err;
2416 
2417         ext4_fname_from_fscrypt_name(fname, &name);
2418 
2419 #ifdef CONFIG_UNICODE
2420         ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2421 #endif
2422         return 0;
2423 }
2424 
2425 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2426 {
2427         struct fscrypt_name name;
2428 
2429         name.crypto_buf = fname->crypto_buf;
2430         fscrypt_free_filename(&name);
2431 
2432         fname->crypto_buf.name = NULL;
2433         fname->usr_fname = NULL;
2434         fname->disk_name.name = NULL;
2435 
2436 #ifdef CONFIG_UNICODE
2437         kfree(fname->cf_name.name);
2438         fname->cf_name.name = NULL;
2439 #endif
2440 }
2441 #else /* !CONFIG_FS_ENCRYPTION */
2442 static inline int ext4_fname_setup_filename(struct inode *dir,
2443                                             const struct qstr *iname,
2444                                             int lookup,
2445                                             struct ext4_filename *fname)
2446 {
2447         fname->usr_fname = iname;
2448         fname->disk_name.name = (unsigned char *) iname->name;
2449         fname->disk_name.len = iname->len;
2450 
2451 #ifdef CONFIG_UNICODE
2452         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2453 #endif
2454 
2455         return 0;
2456 }
2457 
2458 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2459                                             struct dentry *dentry,
2460                                             struct ext4_filename *fname)
2461 {
2462         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2463 }
2464 
2465 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2466 {
2467 #ifdef CONFIG_UNICODE
2468         kfree(fname->cf_name.name);
2469         fname->cf_name.name = NULL;
2470 #endif
2471 }
2472 #endif /* !CONFIG_FS_ENCRYPTION */
2473 
2474 /* dir.c */
2475 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2476                                   struct file *,
2477                                   struct ext4_dir_entry_2 *,
2478                                   struct buffer_head *, char *, int,
2479                                   unsigned int);
2480 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2481         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2482                                         (de), (bh), (buf), (size), (offset)))
2483 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2484                                 __u32 minor_hash,
2485                                 struct ext4_dir_entry_2 *dirent,
2486                                 struct fscrypt_str *ent_name);
2487 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2488 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2489                              struct buffer_head *bh,
2490                              void *buf, int buf_size,
2491                              struct ext4_filename *fname,
2492                              struct ext4_dir_entry_2 **dest_de);
2493 void ext4_insert_dentry(struct inode *inode,
2494                         struct ext4_dir_entry_2 *de,
2495                         int buf_size,
2496                         struct ext4_filename *fname);
2497 static inline void ext4_update_dx_flag(struct inode *inode)
2498 {
2499         if (!ext4_has_feature_dir_index(inode->i_sb)) {
2500                 /* ext4_iget() should have caught this... */
2501                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2502                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2503         }
2504 }
2505 static const unsigned char ext4_filetype_table[] = {
2506         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2507 };
2508 
2509 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2510 {
2511         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2512                 return DT_UNKNOWN;
2513 
2514         return ext4_filetype_table[filetype];
2515 }
2516 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2517                              void *buf, int buf_size);
2518 
2519 /* fsync.c */
2520 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2521 
2522 /* hash.c */
2523 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2524                           struct dx_hash_info *hinfo);
2525 
2526 /* ialloc.c */
2527 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2528                                       const struct qstr *qstr, __u32 goal,
2529                                       uid_t *owner, __u32 i_flags,
2530                                       int handle_type, unsigned int line_no,
2531                                       int nblocks);
2532 
2533 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2534         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2535                          i_flags, 0, 0, 0)
2536 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2537                                     type, nblocks)                  \
2538         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2539                          0, (type), __LINE__, (nblocks))
2540 
2541 
2542 extern void ext4_free_inode(handle_t *, struct inode *);
2543 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2544 extern unsigned long ext4_count_free_inodes(struct super_block *);
2545 extern unsigned long ext4_count_dirs(struct super_block *);
2546 extern void ext4_check_inodes_bitmap(struct super_block *);
2547 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2548 extern int ext4_init_inode_table(struct super_block *sb,
2549                                  ext4_group_t group, int barrier);
2550 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2551 
2552 /* mballoc.c */
2553 extern const struct seq_operations ext4_mb_seq_groups_ops;
2554 extern long ext4_mb_stats;
2555 extern long ext4_mb_max_to_scan;
2556 extern int ext4_mb_init(struct super_block *);
2557 extern int ext4_mb_release(struct super_block *);
2558 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2559                                 struct ext4_allocation_request *, int *);
2560 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2561 extern void ext4_discard_preallocations(struct inode *);
2562 extern int __init ext4_init_mballoc(void);
2563 extern void ext4_exit_mballoc(void);
2564 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2565                              struct buffer_head *bh, ext4_fsblk_t block,
2566                              unsigned long count, int flags);
2567 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2568                                    ext4_group_t ngroups);
2569 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2570                 ext4_group_t i, struct ext4_group_desc *desc);
2571 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2572                                 ext4_fsblk_t block, unsigned long count);
2573 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2574 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2575 
2576 /* inode.c */
2577 int ext4_inode_is_fast_symlink(struct inode *inode);
2578 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2579 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2580 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2581                      bool wait, struct buffer_head **bhs);
2582 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2583                              struct buffer_head *bh_result, int create);
2584 int ext4_get_block(struct inode *inode, sector_t iblock,
2585                    struct buffer_head *bh_result, int create);
2586 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2587                        struct buffer_head *bh_result, int create);
2588 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2589                            struct buffer_head *bh, int create);
2590 int ext4_walk_page_buffers(handle_t *handle,
2591                            struct buffer_head *head,
2592                            unsigned from,
2593                            unsigned to,
2594                            int *partial,
2595                            int (*fn)(handle_t *handle,
2596                                      struct buffer_head *bh));
2597 int do_journal_get_write_access(handle_t *handle,
2598                                 struct buffer_head *bh);
2599 #define FALL_BACK_TO_NONDELALLOC 1
2600 #define CONVERT_INLINE_DATA      2
2601 
2602 typedef enum {
2603         EXT4_IGET_NORMAL =      0,
2604         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2605         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2606 } ext4_iget_flags;
2607 
2608 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2609                                  ext4_iget_flags flags, const char *function,
2610                                  unsigned int line);
2611 
2612 #define ext4_iget(sb, ino, flags) \
2613         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2614 
2615 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2616 extern int  ext4_setattr(struct dentry *, struct iattr *);
2617 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2618 extern void ext4_evict_inode(struct inode *);
2619 extern void ext4_clear_inode(struct inode *);
2620 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2621 extern int  ext4_sync_inode(handle_t *, struct inode *);
2622 extern void ext4_dirty_inode(struct inode *, int);
2623 extern int ext4_change_inode_journal_flag(struct inode *, int);
2624 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2625 extern int ext4_inode_attach_jinode(struct inode *inode);
2626 extern int ext4_can_truncate(struct inode *inode);
2627 extern int ext4_truncate(struct inode *);
2628 extern int ext4_break_layouts(struct inode *);
2629 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2630 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2631 extern void ext4_set_inode_flags(struct inode *);
2632 extern int ext4_alloc_da_blocks(struct inode *inode);
2633 extern void ext4_set_aops(struct inode *inode);
2634 extern int ext4_writepage_trans_blocks(struct inode *);
2635 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2636 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2637                              loff_t lstart, loff_t lend);
2638 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2639 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2640 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2641 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2642 extern void ext4_da_release_space(struct inode *inode, int to_free);
2643 extern void ext4_da_update_reserve_space(struct inode *inode,
2644                                         int used, int quota_claim);
2645 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2646                               ext4_fsblk_t pblk, ext4_lblk_t len);
2647 
2648 /* indirect.c */
2649 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2650                                 struct ext4_map_blocks *map, int flags);
2651 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2652 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2653 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2654 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2655                                  ext4_lblk_t start, ext4_lblk_t end);
2656 
2657 /* ioctl.c */
2658 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2659 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2660 
2661 /* migrate.c */
2662 extern int ext4_ext_migrate(struct inode *);
2663 extern int ext4_ind_migrate(struct inode *inode);
2664 
2665 /* namei.c */
2666 extern int ext4_dirblock_csum_verify(struct inode *inode,
2667                                      struct buffer_head *bh);
2668 extern int ext4_orphan_add(handle_t *, struct inode *);
2669 extern int ext4_orphan_del(handle_t *, struct inode *);
2670 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2671                                 __u32 start_minor_hash, __u32 *next_hash);
2672 extern int ext4_search_dir(struct buffer_head *bh,
2673                            char *search_buf,
2674                            int buf_size,
2675                            struct inode *dir,
2676                            struct ext4_filename *fname,
2677                            unsigned int offset,
2678                            struct ext4_dir_entry_2 **res_dir);
2679 extern int ext4_generic_delete_entry(handle_t *handle,
2680                                      struct inode *dir,
2681                                      struct ext4_dir_entry_2 *de_del,
2682                                      struct buffer_head *bh,
2683                                      void *entry_buf,
2684                                      int buf_size,
2685                                      int csum_size);
2686 extern bool ext4_empty_dir(struct inode *inode);
2687 
2688 /* resize.c */
2689 extern void ext4_kvfree_array_rcu(void *to_free);
2690 extern int ext4_group_add(struct super_block *sb,
2691                                 struct ext4_new_group_data *input);
2692 extern int ext4_group_extend(struct super_block *sb,
2693                                 struct ext4_super_block *es,
2694                                 ext4_fsblk_t n_blocks_count);
2695 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2696 
2697 /* super.c */
2698 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2699                                          sector_t block, int op_flags);
2700 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2701 extern int ext4_calculate_overhead(struct super_block *sb);
2702 extern void ext4_superblock_csum_set(struct super_block *sb);
2703 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2704 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2705 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2706                                     ext4_group_t ngroup);
2707 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2708                                      char nbuf[16]);
2709 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2710                                              ext4_group_t block_group,
2711                                              unsigned int flags);
2712 
2713 extern __printf(4, 5)
2714 void __ext4_error(struct super_block *, const char *, unsigned int,
2715                   const char *, ...);
2716 extern __printf(5, 6)
2717 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2718                       const char *, ...);
2719 extern __printf(5, 6)
2720 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2721                      const char *, ...);
2722 extern void __ext4_std_error(struct super_block *, const char *,
2723                              unsigned int, int);
2724 extern __printf(4, 5)
2725 void __ext4_abort(struct super_block *, const char *, unsigned int,
2726                   const char *, ...);
2727 extern __printf(4, 5)
2728 void __ext4_warning(struct super_block *, const char *, unsigned int,
2729                     const char *, ...);
2730 extern __printf(4, 5)
2731 void __ext4_warning_inode(const struct inode *inode, const char *function,
2732                           unsigned int line, const char *fmt, ...);
2733 extern __printf(3, 4)
2734 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2735 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2736                            const char *, unsigned int, const char *);
2737 extern __printf(7, 8)
2738 void __ext4_grp_locked_error(const char *, unsigned int,
2739                              struct super_block *, ext4_group_t,
2740                              unsigned long, ext4_fsblk_t,
2741                              const char *, ...);
2742 
2743 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2744         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2745 
2746 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2747         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2748 
2749 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2750         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2751 
2752 #ifdef CONFIG_PRINTK
2753 
2754 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2755         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2756 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2757         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2758 #define ext4_error(sb, fmt, ...)                                        \
2759         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2760 #define ext4_abort(sb, fmt, ...)                                        \
2761         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2762 #define ext4_warning(sb, fmt, ...)                                      \
2763         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2764 #define ext4_warning_inode(inode, fmt, ...)                             \
2765         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2766 #define ext4_msg(sb, level, fmt, ...)                           \
2767         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2768 #define dump_mmp_msg(sb, mmp, msg)                                      \
2769         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2770 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2771         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2772                                 fmt, ##__VA_ARGS__)
2773 
2774 #else
2775 
2776 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2777 do {                                                                    \
2778         no_printk(fmt, ##__VA_ARGS__);                                  \
2779         __ext4_error_inode(inode, "", 0, block, " ");                   \
2780 } while (0)
2781 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2782 do {                                                                    \
2783         no_printk(fmt, ##__VA_ARGS__);                                  \
2784         __ext4_error_file(file, "", 0, block, " ");                     \
2785 } while (0)
2786 #define ext4_error(sb, fmt, ...)                                        \
2787 do {                                                                    \
2788         no_printk(fmt, ##__VA_ARGS__);                                  \
2789         __ext4_error(sb, "", 0, " ");                                   \
2790 } while (0)
2791 #define ext4_abort(sb, fmt, ...)                                        \
2792 do {                                                                    \
2793         no_printk(fmt, ##__VA_ARGS__);                                  \
2794         __ext4_abort(sb, "", 0, " ");                                   \
2795 } while (0)
2796 #define ext4_warning(sb, fmt, ...)                                      \
2797 do {                                                                    \
2798         no_printk(fmt, ##__VA_ARGS__);                                  \
2799         __ext4_warning(sb, "", 0, " ");                                 \
2800 } while (0)
2801 #define ext4_warning_inode(inode, fmt, ...)                             \
2802 do {                                                                    \
2803         no_printk(fmt, ##__VA_ARGS__);                                  \
2804         __ext4_warning_inode(inode, "", 0, " ");                        \
2805 } while (0)
2806 #define ext4_msg(sb, level, fmt, ...)                                   \
2807 do {                                                                    \
2808         no_printk(fmt, ##__VA_ARGS__);                                  \
2809         __ext4_msg(sb, "", " ");                                        \
2810 } while (0)
2811 #define dump_mmp_msg(sb, mmp, msg)                                      \
2812         __dump_mmp_msg(sb, mmp, "", 0, "")
2813 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2814 do {                                                                    \
2815         no_printk(fmt, ##__VA_ARGS__);                          \
2816         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2817 } while (0)
2818 
2819 #endif
2820 
2821 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2822                                         __u32 compat);
2823 extern int ext4_update_rocompat_feature(handle_t *handle,
2824                                         struct super_block *sb, __u32 rocompat);
2825 extern int ext4_update_incompat_feature(handle_t *handle,
2826                                         struct super_block *sb, __u32 incompat);
2827 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2828                                       struct ext4_group_desc *bg);
2829 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2830                                       struct ext4_group_desc *bg);
2831 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2832                                      struct ext4_group_desc *bg);
2833 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2834                                       struct ext4_group_desc *bg);
2835 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2836                                  struct ext4_group_desc *bg);
2837 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2838                                 struct ext4_group_desc *bg);
2839 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2840                                    struct ext4_group_desc *bg);
2841 extern void ext4_block_bitmap_set(struct super_block *sb,
2842                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2843 extern void ext4_inode_bitmap_set(struct super_block *sb,
2844                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2845 extern void ext4_inode_table_set(struct super_block *sb,
2846                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2847 extern void ext4_free_group_clusters_set(struct super_block *sb,
2848                                          struct ext4_group_desc *bg,
2849                                          __u32 count);
2850 extern void ext4_free_inodes_set(struct super_block *sb,
2851                                 struct ext4_group_desc *bg, __u32 count);
2852 extern void ext4_used_dirs_set(struct super_block *sb,
2853                                 struct ext4_group_desc *bg, __u32 count);
2854 extern void ext4_itable_unused_set(struct super_block *sb,
2855                                    struct ext4_group_desc *bg, __u32 count);
2856 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2857                                        struct ext4_group_desc *gdp);
2858 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2859                                      struct ext4_group_desc *gdp);
2860 extern int ext4_register_li_request(struct super_block *sb,
2861                                     ext4_group_t first_not_zeroed);
2862 
2863 static inline int ext4_has_metadata_csum(struct super_block *sb)
2864 {
2865         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2866                      !EXT4_SB(sb)->s_chksum_driver);
2867 
2868         return ext4_has_feature_metadata_csum(sb) &&
2869                (EXT4_SB(sb)->s_chksum_driver != NULL);
2870 }
2871 
2872 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2873 {
2874         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2875 }
2876 
2877 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2878 {
2879         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2880                 le32_to_cpu(es->s_blocks_count_lo);
2881 }
2882 
2883 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2884 {
2885         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2886                 le32_to_cpu(es->s_r_blocks_count_lo);
2887 }
2888 
2889 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2890 {
2891         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2892                 le32_to_cpu(es->s_free_blocks_count_lo);
2893 }
2894 
2895 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2896                                          ext4_fsblk_t blk)
2897 {
2898         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2899         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2900 }
2901 
2902 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2903                                               ext4_fsblk_t blk)
2904 {
2905         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2906         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2907 }
2908 
2909 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2910                                            ext4_fsblk_t blk)
2911 {
2912         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2913         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2914 }
2915 
2916 static inline loff_t ext4_isize(struct super_block *sb,
2917                                 struct ext4_inode *raw_inode)
2918 {
2919         if (ext4_has_feature_largedir(sb) ||
2920             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2921                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2922                         le32_to_cpu(raw_inode->i_size_lo);
2923 
2924         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2925 }
2926 
2927 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2928 {
2929         raw_inode->i_size_lo = cpu_to_le32(i_size);
2930         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2931 }
2932 
2933 static inline
2934 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2935                                             ext4_group_t group)
2936 {
2937          struct ext4_group_info **grp_info;
2938          long indexv, indexh;
2939          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2940          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2941          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2942          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
2943          return grp_info[indexh];
2944 }
2945 
2946 /*
2947  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2948  * the locking protocol documented in the comments of ext4_group_add()
2949  * in resize.c
2950  */
2951 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2952 {
2953         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2954 
2955         smp_rmb();
2956         return ngroups;
2957 }
2958 
2959 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2960                                              ext4_group_t block_group)
2961 {
2962         return block_group >> sbi->s_log_groups_per_flex;
2963 }
2964 
2965 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2966 {
2967         return 1 << sbi->s_log_groups_per_flex;
2968 }
2969 
2970 #define ext4_std_error(sb, errno)                               \
2971 do {                                                            \
2972         if ((errno))                                            \
2973                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2974 } while (0)
2975 
2976 #ifdef CONFIG_SMP
2977 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2978  * counters. So we need to make sure we have free clusters more
2979  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2980  */
2981 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2982 #else
2983 #define EXT4_FREECLUSTERS_WATERMARK 0
2984 #endif
2985 
2986 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2987 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2988 {
2989         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2990                      !inode_is_locked(inode));
2991         down_write(&EXT4_I(inode)->i_data_sem);
2992         if (newsize > EXT4_I(inode)->i_disksize)
2993                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
2994         up_write(&EXT4_I(inode)->i_data_sem);
2995 }
2996 
2997 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2998 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2999 {
3000         int changed = 0;
3001 
3002         if (newsize > inode->i_size) {
3003                 i_size_write(inode, newsize);
3004                 changed = 1;
3005         }
3006         if (newsize > EXT4_I(inode)->i_disksize) {
3007                 ext4_update_i_disksize(inode, newsize);
3008                 changed |= 2;
3009         }
3010         return changed;
3011 }
3012 
3013 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3014                                       loff_t len);
3015 
3016 struct ext4_group_info {
3017         unsigned long   bb_state;
3018         struct rb_root  bb_free_root;
3019         ext4_grpblk_t   bb_first_free;  /* first free block */
3020         ext4_grpblk_t   bb_free;        /* total free blocks */
3021         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
3022         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
3023         struct          list_head bb_prealloc_list;
3024 #ifdef DOUBLE_CHECK
3025         void            *bb_bitmap;
3026 #endif
3027         struct rw_semaphore alloc_sem;
3028         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3029                                          * regions, index is order.
3030                                          * bb_counters[3] = 5 means
3031                                          * 5 free 8-block regions. */
3032 };
3033 
3034 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3035 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3036 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3037 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3038 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3039         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3040 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3041         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3042 
3043 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3044         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3045 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3046         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3047 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3048         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3049 
3050 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3051         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3052 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3053         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3054 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3055         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3056 
3057 #define EXT4_MAX_CONTENTION             8
3058 #define EXT4_CONTENTION_THRESHOLD       2
3059 
3060 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3061                                               ext4_group_t group)
3062 {
3063         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3064 }
3065 
3066 /*
3067  * Returns true if the filesystem is busy enough that attempts to
3068  * access the block group locks has run into contention.
3069  */
3070 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3071 {
3072         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3073 }
3074 
3075 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3076 {
3077         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3078         if (spin_trylock(lock))
3079                 /*
3080                  * We're able to grab the lock right away, so drop the
3081                  * lock contention counter.
3082                  */
3083                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3084         else {
3085                 /*
3086                  * The lock is busy, so bump the contention counter,
3087                  * and then wait on the spin lock.
3088                  */
3089                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3090                                   EXT4_MAX_CONTENTION);
3091                 spin_lock(lock);
3092         }
3093 }
3094 
3095 static inline void ext4_unlock_group(struct super_block *sb,
3096                                         ext4_group_t group)
3097 {
3098         spin_unlock(ext4_group_lock_ptr(sb, group));
3099 }
3100 
3101 /*
3102  * Block validity checking
3103  */
3104 #define ext4_check_indirect_blockref(inode, bh)                         \
3105         ext4_check_blockref(__func__, __LINE__, inode,                  \
3106                             (__le32 *)(bh)->b_data,                     \
3107                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3108 
3109 #define ext4_ind_check_inode(inode)                                     \
3110         ext4_check_blockref(__func__, __LINE__, inode,                  \
3111                             EXT4_I(inode)->i_data,                      \
3112                             EXT4_NDIR_BLOCKS)
3113 
3114 /*
3115  * Inodes and files operations
3116  */
3117 
3118 /* dir.c */
3119 extern const struct file_operations ext4_dir_operations;
3120 
3121 #ifdef CONFIG_UNICODE
3122 extern const struct dentry_operations ext4_dentry_ops;
3123 #endif
3124 
3125 /* file.c */
3126 extern const struct inode_operations ext4_file_inode_operations;
3127 extern const struct file_operations ext4_file_operations;
3128 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3129 
3130 /* inline.c */
3131 extern int ext4_get_max_inline_size(struct inode *inode);
3132 extern int ext4_find_inline_data_nolock(struct inode *inode);
3133 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3134                                  unsigned int len);
3135 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3136 
3137 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3138 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3139                                          struct inode *inode,
3140                                          loff_t pos, unsigned len,
3141                                          unsigned flags,
3142                                          struct page **pagep);
3143 extern int ext4_write_inline_data_end(struct inode *inode,
3144                                       loff_t pos, unsigned len,
3145                                       unsigned copied,
3146                                       struct page *page);
3147 extern struct buffer_head *
3148 ext4_journalled_write_inline_data(struct inode *inode,
3149                                   unsigned len,
3150                                   struct page *page);
3151 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3152                                            struct inode *inode,
3153                                            loff_t pos, unsigned len,
3154                                            unsigned flags,
3155                                            struct page **pagep,
3156                                            void **fsdata);
3157 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3158                                          unsigned len, unsigned copied,
3159                                          struct page *page);
3160 extern int ext4_try_add_inline_entry(handle_t *handle,
3161                                      struct ext4_filename *fname,
3162                                      struct inode *dir, struct inode *inode);
3163 extern int ext4_try_create_inline_dir(handle_t *handle,
3164                                       struct inode *parent,
3165                                       struct inode *inode);
3166 extern int ext4_read_inline_dir(struct file *filp,
3167                                 struct dir_context *ctx,
3168                                 int *has_inline_data);
3169 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3170                                   struct inode *dir, ext4_lblk_t block,
3171                                   struct dx_hash_info *hinfo,
3172                                   __u32 start_hash, __u32 start_minor_hash,
3173                                   int *has_inline_data);
3174 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3175                                         struct ext4_filename *fname,
3176                                         struct ext4_dir_entry_2 **res_dir,
3177                                         int *has_inline_data);
3178 extern int ext4_delete_inline_entry(handle_t *handle,
3179                                     struct inode *dir,
3180                                     struct ext4_dir_entry_2 *de_del,
3181                                     struct buffer_head *bh,
3182                                     int *has_inline_data);
3183 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3184 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3185                                         struct ext4_dir_entry_2 **parent_de,
3186                                         int *retval);
3187 extern int ext4_inline_data_fiemap(struct inode *inode,
3188                                    struct fiemap_extent_info *fieinfo,
3189                                    int *has_inline, __u64 start, __u64 len);
3190 
3191 struct iomap;
3192 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3193 
3194 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3195 
3196 extern int ext4_convert_inline_data(struct inode *inode);
3197 
3198 static inline int ext4_has_inline_data(struct inode *inode)
3199 {
3200         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3201                EXT4_I(inode)->i_inline_off;
3202 }
3203 
3204 /* namei.c */
3205 extern const struct inode_operations ext4_dir_inode_operations;
3206 extern const struct inode_operations ext4_special_inode_operations;
3207 extern struct dentry *ext4_get_parent(struct dentry *child);
3208 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3209                                  struct ext4_dir_entry_2 *de,
3210                                  int blocksize, int csum_size,
3211                                  unsigned int parent_ino, int dotdot_real_len);
3212 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3213                                         unsigned int blocksize);
3214 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3215                                       struct buffer_head *bh);
3216 extern int ext4_ci_compare(const struct inode *parent,
3217                            const struct qstr *fname,
3218                            const struct qstr *entry, bool quick);
3219 
3220 #define S_SHIFT 12
3221 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3222         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3223         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3224         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3225         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3226         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3227         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3228         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3229 };
3230 
3231 static inline void ext4_set_de_type(struct super_block *sb,
3232                                 struct ext4_dir_entry_2 *de,
3233                                 umode_t mode) {
3234         if (ext4_has_feature_filetype(sb))
3235                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3236 }
3237 
3238 /* readpages.c */
3239 extern int ext4_mpage_readpages(struct address_space *mapping,
3240                                 struct list_head *pages, struct page *page,
3241                                 unsigned nr_pages, bool is_readahead);
3242 extern int __init ext4_init_post_read_processing(void);
3243 extern void ext4_exit_post_read_processing(void);
3244 
3245 /* symlink.c */
3246 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3247 extern const struct inode_operations ext4_symlink_inode_operations;
3248 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3249 
3250 /* sysfs.c */
3251 extern int ext4_register_sysfs(struct super_block *sb);
3252 extern void ext4_unregister_sysfs(struct super_block *sb);
3253 extern int __init ext4_init_sysfs(void);
3254 extern void ext4_exit_sysfs(void);
3255 
3256 /* block_validity */
3257 extern void ext4_release_system_zone(struct super_block *sb);
3258 extern int ext4_setup_system_zone(struct super_block *sb);
3259 extern int __init ext4_init_system_zone(void);
3260 extern void ext4_exit_system_zone(void);
3261 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3262                                  ext4_fsblk_t start_blk,
3263                                  unsigned int count);
3264 extern int ext4_check_blockref(const char *, unsigned int,
3265                                struct inode *, __le32 *, unsigned int);
3266 
3267 /* extents.c */
3268 struct ext4_ext_path;
3269 struct ext4_extent;
3270 
3271 /*
3272  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3273  * __le32.
3274  */
3275 #define EXT_MAX_BLOCKS  0xffffffff
3276 
3277 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3278 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3279 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3280 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3281                                struct ext4_map_blocks *map, int flags);
3282 extern int ext4_ext_truncate(handle_t *, struct inode *);
3283 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3284                                  ext4_lblk_t end);
3285 extern void ext4_ext_init(struct super_block *);
3286 extern void ext4_ext_release(struct super_block *);
3287 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3288                           loff_t len);
3289 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3290                                           loff_t offset, ssize_t len);
3291 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3292                            struct ext4_map_blocks *map, int flags);
3293 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3294                                          ext4_lblk_t lblocks);
3295 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3296                                                    int num,
3297                                                    struct ext4_ext_path *path);
3298 extern int ext4_can_extents_be_merged(struct inode *inode,
3299                                       struct ext4_extent *ex1,
3300                                       struct ext4_extent *ex2);
3301 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3302                                   struct ext4_ext_path **,
3303                                   struct ext4_extent *, int);
3304 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3305                                               struct ext4_ext_path **,
3306                                               int flags);
3307 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3308 extern int ext4_ext_check_inode(struct inode *inode);
3309 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3310 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3311                         __u64 start, __u64 len);
3312 extern int ext4_get_es_cache(struct inode *inode,
3313                              struct fiemap_extent_info *fieinfo,
3314                              __u64 start, __u64 len);
3315 extern int ext4_ext_precache(struct inode *inode);
3316 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3317 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3318 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3319                                 struct inode *inode2, ext4_lblk_t lblk1,
3320                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3321                              int mark_unwritten,int *err);
3322 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3323 
3324 /* move_extent.c */
3325 extern void ext4_double_down_write_data_sem(struct inode *first,
3326                                             struct inode *second);
3327 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3328                                           struct inode *donor_inode);
3329 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3330                              __u64 start_orig, __u64 start_donor,
3331                              __u64 len, __u64 *moved_len);
3332 
3333 /* page-io.c */
3334 extern int __init ext4_init_pageio(void);
3335 extern void ext4_exit_pageio(void);
3336 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3337 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3338 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3339 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3340 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3341                                 struct writeback_control *wbc);
3342 extern void ext4_end_io_rsv_work(struct work_struct *work);
3343 extern void ext4_io_submit(struct ext4_io_submit *io);
3344 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3345                                struct page *page,
3346                                int len,
3347                                struct writeback_control *wbc,
3348                                bool keep_towrite);
3349 
3350 /* mmp.c */
3351 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3352 
3353 /* verity.c */
3354 extern const struct fsverity_operations ext4_verityops;
3355 
3356 /*
3357  * Add new method to test whether block and inode bitmaps are properly
3358  * initialized. With uninit_bg reading the block from disk is not enough
3359  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3360  */
3361 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3362 
3363 static inline int bitmap_uptodate(struct buffer_head *bh)
3364 {
3365         return (buffer_uptodate(bh) &&
3366                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3367 }
3368 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3369 {
3370         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3371 }
3372 
3373 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3374 
3375 /* For ioend & aio unwritten conversion wait queues */
3376 #define EXT4_WQ_HASH_SZ         37
3377 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3378                                             EXT4_WQ_HASH_SZ])
3379 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3380 
3381 extern int ext4_resize_begin(struct super_block *sb);
3382 extern void ext4_resize_end(struct super_block *sb);
3383 
3384 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3385                                               struct ext4_io_end *io_end)
3386 {
3387         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3388                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3389                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3390         }
3391 }
3392 
3393 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3394 {
3395         struct inode *inode = io_end->inode;
3396 
3397         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3398                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3399                 /* Wake up anyone waiting on unwritten extent conversion */
3400                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3401                         wake_up_all(ext4_ioend_wq(inode));
3402         }
3403 }
3404 
3405 extern const struct iomap_ops ext4_iomap_ops;
3406 
3407 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3408 {
3409         /*
3410          * If the buffer has the write error flag, we have failed
3411          * to write out data in the block.  In this  case, we don't
3412          * have to read the block because we may read the old data
3413          * successfully.
3414          */
3415         if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3416                 set_buffer_uptodate(bh);
3417         return buffer_uptodate(bh);
3418 }
3419 
3420 #endif  /* __KERNEL__ */
3421 
3422 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3423 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3424 
3425 #endif  /* _EXT4_H */