fs/ext4/ext4.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ext4.h
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT4_H
  18 #define _EXT4_H
  19
  20 #include <linux/types.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/magic.h>
  23 #include <linux/jbd2.h>
  24 #include <linux/quota.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/rbtree.h>
  27 #include <linux/seqlock.h>
  28 #include <linux/mutex.h>
  29 #include <linux/timer.h>
  30 #include <linux/wait.h>
  31 #include <linux/sched/signal.h>
  32 #include <linux/blockgroup_lock.h>
  33 #include <linux/percpu_counter.h>
  34 #include <linux/ratelimit.h>
  35 #include <crypto/hash.h>
  36 #include <linux/falloc.h>
  37 #include <linux/percpu-rwsem.h>
  38 #include <linux/fiemap.h>
  39 #ifdef __KERNEL__
  40 #include <linux/compat.h>
  41 #endif
  42
  43 #include <linux/fscrypt.h>
  44 #include <linux/fsverity.h>
  45
  46 #include <linux/compiler.h>
  47
  48 /*
  49  * The fourth extended filesystem constants/structures
  50  */
  51
  52 /*
  53  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  54  * structures. these checks slow things down a lot
  55  */
  56 #define AGGRESSIVE_CHECK__
  57
  58 /*
  59  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  60  * bitmaps, maintains and uses them to check for double allocations
  61  */
  62 #define DOUBLE_CHECK__
  63
  64 /*
  65  * Define EXT4FS_DEBUG to produce debug messages
  66  */
  67 #undef EXT4FS_DEBUG
  68
  69 /*
  70  * Debug code
  71  */
  72 #ifdef EXT4FS_DEBUG
  73 #define ext4_debug(f, a...)                                             \
  74         do {                                                            \
  75                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  76                         __FILE__, __LINE__, __func__);                  \
  77                 printk(KERN_DEBUG f, ## a);                             \
  78         } while (0)
  79 #else
  80 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  81 #endif
  82
  83  /*
  84   * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
  85   */
  86 #define EXT_DEBUG__
  87
  88 /*
  89  * Dynamic printk for controlled extents debugging.
  90  */
  91 #ifdef CONFIG_EXT4_DEBUG
  92 #define ext_debug(ino, fmt, ...)                                        \
  93         pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt,    \
  94                  current->comm, task_pid_nr(current),                   \
  95                  ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__,       \
  96                  __func__, ##__VA_ARGS__)
  97 #else
  98 #define ext_debug(ino, fmt, ...)        no_printk(fmt, ##__VA_ARGS__)
  99 #endif
 100
 101 /* data type for block offset of block group */
 102 typedef int ext4_grpblk_t;
 103
 104 /* data type for filesystem-wide blocks number */
 105 typedef unsigned long long ext4_fsblk_t;
 106
 107 /* data type for file logical block number */
 108 typedef __u32 ext4_lblk_t;
 109
 110 /* data type for block group number */
 111 typedef unsigned int ext4_group_t;
 112
 113 enum SHIFT_DIRECTION {
 114         SHIFT_LEFT = 0,
 115         SHIFT_RIGHT,
 116 };
 117
 118 /*
 119  * Flags used in mballoc's allocation_context flags field.
 120  *
 121  * Also used to show what's going on for debugging purposes when the
 122  * flag field is exported via the traceport interface
 123  */
 124
 125 /* prefer goal again. length */
 126 #define EXT4_MB_HINT_MERGE              0x0001
 127 /* blocks already reserved */
 128 #define EXT4_MB_HINT_RESERVED           0x0002
 129 /* metadata is being allocated */
 130 #define EXT4_MB_HINT_METADATA           0x0004
 131 /* first blocks in the file */
 132 #define EXT4_MB_HINT_FIRST              0x0008
 133 /* search for the best chunk */
 134 #define EXT4_MB_HINT_BEST               0x0010
 135 /* data is being allocated */
 136 #define EXT4_MB_HINT_DATA               0x0020
 137 /* don't preallocate (for tails) */
 138 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 139 /* allocate for locality group */
 140 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 141 /* allocate goal blocks or none */
 142 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 143 /* goal is meaningful */
 144 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 145 /* blocks already pre-reserved by delayed allocation */
 146 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 147 /* We are doing stream allocation */
 148 #define EXT4_MB_STREAM_ALLOC            0x0800
 149 /* Use reserved root blocks if needed */
 150 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 151 /* Use blocks from reserved pool */
 152 #define EXT4_MB_USE_RESERVED            0x2000
 153 /* Do strict check for free blocks while retrying block allocation */
 154 #define EXT4_MB_STRICT_CHECK            0x4000
 155
 156 struct ext4_allocation_request {
 157         /* target inode for block we're allocating */
 158         struct inode *inode;
 159         /* how many blocks we want to allocate */
 160         unsigned int len;
 161         /* logical block in target inode */
 162         ext4_lblk_t logical;
 163         /* the closest logical allocated block to the left */
 164         ext4_lblk_t lleft;
 165         /* the closest logical allocated block to the right */
 166         ext4_lblk_t lright;
 167         /* phys. target (a hint) */
 168         ext4_fsblk_t goal;
 169         /* phys. block for the closest logical allocated block to the left */
 170         ext4_fsblk_t pleft;
 171         /* phys. block for the closest logical allocated block to the right */
 172         ext4_fsblk_t pright;
 173         /* flags. see above EXT4_MB_HINT_* */
 174         unsigned int flags;
 175 };
 176
 177 /*
 178  * Logical to physical block mapping, used by ext4_map_blocks()
 179  *
 180  * This structure is used to pass requests into ext4_map_blocks() as
 181  * well as to store the information returned by ext4_map_blocks().  It
 182  * takes less room on the stack than a struct buffer_head.
 183  */
 184 #define EXT4_MAP_NEW            BIT(BH_New)
 185 #define EXT4_MAP_MAPPED         BIT(BH_Mapped)
 186 #define EXT4_MAP_UNWRITTEN      BIT(BH_Unwritten)
 187 #define EXT4_MAP_BOUNDARY       BIT(BH_Boundary)
 188 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 189                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 190
 191 struct ext4_map_blocks {
 192         ext4_fsblk_t m_pblk;
 193         ext4_lblk_t m_lblk;
 194         unsigned int m_len;
 195         unsigned int m_flags;
 196 };
 197
 198 /*
 199  * Block validity checking, system zone rbtree.
 200  */
 201 struct ext4_system_blocks {
 202         struct rb_root root;
 203         struct rcu_head rcu;
 204 };
 205
 206 /*
 207  * Flags for ext4_io_end->flags
 208  */
 209 #define EXT4_IO_END_UNWRITTEN   0x0001
 210
 211 struct ext4_io_end_vec {
 212         struct list_head list;          /* list of io_end_vec */
 213         loff_t offset;                  /* offset in the file */
 214         ssize_t size;                   /* size of the extent */
 215 };
 216
 217 /*
 218  * For converting unwritten extents on a work queue. 'handle' is used for
 219  * buffered writeback.
 220  */
 221 typedef struct ext4_io_end {
 222         struct list_head        list;           /* per-file finished IO list */
 223         handle_t                *handle;        /* handle reserved for extent
 224                                                  * conversion */
 225         struct inode            *inode;         /* file being written to */
 226         struct bio              *bio;           /* Linked list of completed
 227                                                  * bios covering the extent */
 228         unsigned int            flag;           /* unwritten or not */
 229         atomic_t                count;          /* reference counter */
 230         struct list_head        list_vec;       /* list of ext4_io_end_vec */
 231 } ext4_io_end_t;
 232
 233 struct ext4_io_submit {
 234         struct writeback_control *io_wbc;
 235         struct bio              *io_bio;
 236         ext4_io_end_t           *io_end;
 237         sector_t                io_next_block;
 238 };
 239
 240 /*
 241  * Special inodes numbers
 242  */
 243 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 244 #define EXT4_ROOT_INO            2      /* Root inode */
 245 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 246 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 247 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 248 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 249 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 250 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 251
 252 /* First non-reserved inode for old ext4 filesystems */
 253 #define EXT4_GOOD_OLD_FIRST_INO 11
 254
 255 /*
 256  * Maximal count of links to a file
 257  */
 258 #define EXT4_LINK_MAX           65000
 259
 260 /*
 261  * Macro-instructions used to manage several block sizes
 262  */
 263 #define EXT4_MIN_BLOCK_SIZE             1024
 264 #define EXT4_MAX_BLOCK_SIZE             65536
 265 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 266 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 267 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 268 #ifdef __KERNEL__
 269 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 270 #else
 271 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 272 #endif
 273 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 274 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 275                                          EXT4_SB(s)->s_cluster_bits)
 276 #ifdef __KERNEL__
 277 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 278 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 279 #else
 280 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 281 #endif
 282 #ifdef __KERNEL__
 283 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 284 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 285 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 286 #else
 287 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 288                                  EXT4_GOOD_OLD_INODE_SIZE : \
 289                                  (s)->s_inode_size)
 290 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 291                                  EXT4_GOOD_OLD_FIRST_INO : \
 292                                  (s)->s_first_ino)
 293 #endif
 294 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 295 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 296         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 297                                                                   blkbits))
 298
 299 /* Translate a block number to a cluster number */
 300 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 301 /* Translate a cluster number to a block number */
 302 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 303 /* Translate # of blks to # of clusters */
 304 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 305                                  (sbi)->s_cluster_bits)
 306 /* Mask out the low bits to get the starting block of the cluster */
 307 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 308                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 309 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 310                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 311 /* Fill in the low bits to get the last block of the cluster */
 312 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
 313                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
 314 /* Get the cluster offset */
 315 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 316                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 317 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 318                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 319
 320 /*
 321  * Structure of a blocks group descriptor
 322  */
 323 struct ext4_group_desc
 324 {
 325         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 326         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 327         __le32  bg_inode_table_lo;      /* Inodes table block */
 328         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 329         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 330         __le16  bg_used_dirs_count_lo;  /* Directories count */
 331         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 332         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 333         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 334         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 335         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 336         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 337         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 338         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 339         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 340         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 341         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 342         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 343         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 344         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 345         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 346         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 347         __u32   bg_reserved;
 348 };
 349
 350 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 351         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 352          sizeof(__le16))
 353 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 354         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 355          sizeof(__le16))
 356
 357 /*
 358  * Structure of a flex block group info
 359  */
 360
 361 struct flex_groups {
 362         atomic64_t      free_clusters;
 363         atomic_t        free_inodes;
 364         atomic_t        used_dirs;
 365 };
 366
 367 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 368 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 369 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 370
 371 /*
 372  * Macro-instructions used to manage group descriptors
 373  */
 374 #define EXT4_MIN_DESC_SIZE              32
 375 #define EXT4_MIN_DESC_SIZE_64BIT        64
 376 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 377 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 378 #ifdef __KERNEL__
 379 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 380 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 381 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 382 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 383 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 384 #else
 385 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 386 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 387 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 388 #endif
 389
 390 /*
 391  * Constants relative to the data blocks
 392  */
 393 #define EXT4_NDIR_BLOCKS                12
 394 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 395 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 396 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 397 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 398
 399 /*
 400  * Inode flags
 401  */
 402 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 403 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 404 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 405 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 406 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 407 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 408 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 409 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 410 /* Reserved for compression usage... */
 411 #define EXT4_DIRTY_FL                   0x00000100
 412 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 413 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 414         /* nb: was previously EXT2_ECOMPR_FL */
 415 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 416 /* End compression flags --- maybe not all used */
 417 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 418 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 419 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 420 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 421 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 422 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 423 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 424 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 425 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 426 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 427 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
 428
 429 #define EXT4_DAX_FL                     0x02000000 /* Inode is DAX */
 430
 431 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 432 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 433 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded directory */
 434 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 435
 436 /* User modifiable flags */
 437 #define EXT4_FL_USER_MODIFIABLE         (EXT4_SECRM_FL | \
 438                                          EXT4_UNRM_FL | \
 439                                          EXT4_COMPR_FL | \
 440                                          EXT4_SYNC_FL | \
 441                                          EXT4_IMMUTABLE_FL | \
 442                                          EXT4_APPEND_FL | \
 443                                          EXT4_NODUMP_FL | \
 444                                          EXT4_NOATIME_FL | \
 445                                          EXT4_JOURNAL_DATA_FL | \
 446                                          EXT4_NOTAIL_FL | \
 447                                          EXT4_DIRSYNC_FL | \
 448                                          EXT4_TOPDIR_FL | \
 449                                          EXT4_EXTENTS_FL | \
 450                                          0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
 451                                          EXT4_DAX_FL | \
 452                                          EXT4_PROJINHERIT_FL | \
 453                                          EXT4_CASEFOLD_FL)
 454
 455 /* User visible flags */
 456 #define EXT4_FL_USER_VISIBLE            (EXT4_FL_USER_MODIFIABLE | \
 457                                          EXT4_DIRTY_FL | \
 458                                          EXT4_COMPRBLK_FL | \
 459                                          EXT4_NOCOMPR_FL | \
 460                                          EXT4_ENCRYPT_FL | \
 461                                          EXT4_INDEX_FL | \
 462                                          EXT4_VERITY_FL | \
 463                                          EXT4_INLINE_DATA_FL)
 464
 465 /* Flags we can manipulate with through FS_IOC_FSSETXATTR */
 466 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 467                                          EXT4_IMMUTABLE_FL | \
 468                                          EXT4_APPEND_FL | \
 469                                          EXT4_NODUMP_FL | \
 470                                          EXT4_NOATIME_FL | \
 471                                          EXT4_PROJINHERIT_FL | \
 472                                          EXT4_DAX_FL)
 473
 474 /* Flags that should be inherited by new inodes from their parent. */
 475 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 476                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 477                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 478                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 479                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
 480                            EXT4_DAX_FL)
 481
 482 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 483 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 484                            EXT4_PROJINHERIT_FL))
 485
 486 /* Flags that are appropriate for non-directories/regular files. */
 487 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 488
 489 /* The only flags that should be swapped */
 490 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 491
 492 /* Flags which are mutually exclusive to DAX */
 493 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
 494                            EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
 495
 496 /* Mask out flags that are inappropriate for the given type of inode. */
 497 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 498 {
 499         if (S_ISDIR(mode))
 500                 return flags;
 501         else if (S_ISREG(mode))
 502                 return flags & EXT4_REG_FLMASK;
 503         else
 504                 return flags & EXT4_OTHER_FLMASK;
 505 }
 506
 507 /*
 508  * Inode flags used for atomic set/get
 509  */
 510 enum {
 511         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 512         EXT4_INODE_UNRM         = 1,    /* Undelete */
 513         EXT4_INODE_COMPR        = 2,    /* Compress file */
 514         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 515         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 516         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 517         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 518         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 519 /* Reserved for compression usage... */
 520         EXT4_INODE_DIRTY        = 8,
 521         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 522         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 523         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 524 /* End compression flags --- maybe not all used */
 525         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 526         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 527         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 528         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 529         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 530         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 531         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 532         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 533         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 534         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 535 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
 536         EXT4_INODE_DAX          = 25,   /* Inode is DAX */
 537         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 538         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 539         EXT4_INODE_CASEFOLD     = 30,   /* Casefolded directory */
 540         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 541 };
 542
 543 /*
 544  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 545  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 546  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 547  * any extra space in the compiled kernel image, otherwise, the build will fail.
 548  * It's important that these values are the same, since we are using
 549  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 550  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 551  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 552  * defined in e2fsprogs.
 553  *
 554  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 555  */
 556 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 557 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 558
 559 static inline void ext4_check_flag_values(void)
 560 {
 561         CHECK_FLAG_VALUE(SECRM);
 562         CHECK_FLAG_VALUE(UNRM);
 563         CHECK_FLAG_VALUE(COMPR);
 564         CHECK_FLAG_VALUE(SYNC);
 565         CHECK_FLAG_VALUE(IMMUTABLE);
 566         CHECK_FLAG_VALUE(APPEND);
 567         CHECK_FLAG_VALUE(NODUMP);
 568         CHECK_FLAG_VALUE(NOATIME);
 569         CHECK_FLAG_VALUE(DIRTY);
 570         CHECK_FLAG_VALUE(COMPRBLK);
 571         CHECK_FLAG_VALUE(NOCOMPR);
 572         CHECK_FLAG_VALUE(ENCRYPT);
 573         CHECK_FLAG_VALUE(INDEX);
 574         CHECK_FLAG_VALUE(IMAGIC);
 575         CHECK_FLAG_VALUE(JOURNAL_DATA);
 576         CHECK_FLAG_VALUE(NOTAIL);
 577         CHECK_FLAG_VALUE(DIRSYNC);
 578         CHECK_FLAG_VALUE(TOPDIR);
 579         CHECK_FLAG_VALUE(HUGE_FILE);
 580         CHECK_FLAG_VALUE(EXTENTS);
 581         CHECK_FLAG_VALUE(VERITY);
 582         CHECK_FLAG_VALUE(EA_INODE);
 583         CHECK_FLAG_VALUE(INLINE_DATA);
 584         CHECK_FLAG_VALUE(PROJINHERIT);
 585         CHECK_FLAG_VALUE(CASEFOLD);
 586         CHECK_FLAG_VALUE(RESERVED);
 587 }
 588
 589 /* Used to pass group descriptor data when online resize is done */
 590 struct ext4_new_group_input {
 591         __u32 group;            /* Group number for this data */
 592         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 593         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 594         __u64 inode_table;      /* Absolute block number of inode table start */
 595         __u32 blocks_count;     /* Total number of blocks in this group */
 596         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 597         __u16 unused;
 598 };
 599
 600 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 601 struct compat_ext4_new_group_input {
 602         u32 group;
 603         compat_u64 block_bitmap;
 604         compat_u64 inode_bitmap;
 605         compat_u64 inode_table;
 606         u32 blocks_count;
 607         u16 reserved_blocks;
 608         u16 unused;
 609 };
 610 #endif
 611
 612 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 613 struct ext4_new_group_data {
 614         __u32 group;
 615         __u64 block_bitmap;
 616         __u64 inode_bitmap;
 617         __u64 inode_table;
 618         __u32 blocks_count;
 619         __u16 reserved_blocks;
 620         __u16 mdata_blocks;
 621         __u32 free_clusters_count;
 622 };
 623
 624 /* Indexes used to index group tables in ext4_new_group_data */
 625 enum {
 626         BLOCK_BITMAP = 0,       /* block bitmap */
 627         INODE_BITMAP,           /* inode bitmap */
 628         INODE_TABLE,            /* inode tables */
 629         GROUP_TABLE_COUNT,
 630 };
 631
 632 /*
 633  * Flags used by ext4_map_blocks()
 634  */
 635         /* Allocate any needed blocks and/or convert an unwritten
 636            extent to be an initialized ext4 */
 637 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 638         /* Request the creation of an unwritten extent */
 639 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 640 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 641                                                  EXT4_GET_BLOCKS_CREATE)
 642         /* Caller is from the delayed allocation writeout path
 643          * finally doing the actual allocation of delayed blocks */
 644 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 645         /* caller is from the direct IO path, request to creation of an
 646         unwritten extents if not allocated, split the unwritten
 647         extent if blocks has been preallocated already*/
 648 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 649 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 650 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 651                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 652         /* Convert extent to initialized after IO complete */
 653 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 654                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 655         /* Eventual metadata allocation (due to growing extent tree)
 656          * should not fail, so try to use reserved blocks for that.*/
 657 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 658         /* Don't normalize allocation size (used for fallocate) */
 659 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 660         /* Convert written extents to unwritten */
 661 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 662         /* Write zeros to newly created written extents */
 663 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 664 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 665                                         EXT4_GET_BLOCKS_ZERO)
 666         /* Caller will submit data before dropping transaction handle. This
 667          * allows jbd2 to avoid submitting data before commit. */
 668 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 669
 670 /*
 671  * The bit position of these flags must not overlap with any of the
 672  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 673  * read_extent_tree_block(), ext4_split_extent_at(),
 674  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 675  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 676  * caching the extents when reading from the extent tree while a
 677  * truncate or punch hole operation is in progress.
 678  */
 679 #define EXT4_EX_NOCACHE                         0x40000000
 680 #define EXT4_EX_FORCE_CACHE                     0x20000000
 681 #define EXT4_EX_NOFAIL                          0x10000000
 682
 683 /*
 684  * Flags used by ext4_free_blocks
 685  */
 686 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 687 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 688 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 689 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 690 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 691 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 692 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 693
 694 /*
 695  * ioctl commands
 696  */
 697 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 698 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 699 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 700 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 701 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 702 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 703 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 704 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 705 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 706  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 707  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 708 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 709 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 710 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 711 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 712 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 713 /* ioctl codes 19--39 are reserved for fscrypt */
 714 #define EXT4_IOC_CLEAR_ES_CACHE         _IO('f', 40)
 715 #define EXT4_IOC_GETSTATE               _IOW('f', 41, __u32)
 716 #define EXT4_IOC_GET_ES_CACHE           _IOWR('f', 42, struct fiemap)
 717
 718 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 719
 720 /*
 721  * Flags for going down operation
 722  */
 723 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 724 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 725 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 726
 727 /*
 728  * Flags returned by EXT4_IOC_GETSTATE
 729  *
 730  * We only expose to userspace a subset of the state flags in
 731  * i_state_flags
 732  */
 733 #define EXT4_STATE_FLAG_EXT_PRECACHED   0x00000001
 734 #define EXT4_STATE_FLAG_NEW             0x00000002
 735 #define EXT4_STATE_FLAG_NEWENTRY        0x00000004
 736 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE  0x00000008
 737
 738 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 739 /*
 740  * ioctl commands in 32 bit emulation
 741  */
 742 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 743 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 744 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 745 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 746 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 747 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 748 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 749 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 750 #endif
 751
 752 /*
 753  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 754  * It indicates that the entry in extent status cache is for a hole.
 755  */
 756 #define EXT4_FIEMAP_EXTENT_HOLE         0x08000000
 757
 758 /* Max physical block we can address w/o extents */
 759 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 760
 761 /* Max logical block we can support */
 762 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFE
 763
 764 /*
 765  * Structure of an inode on the disk
 766  */
 767 struct ext4_inode {
 768         __le16  i_mode;         /* File mode */
 769         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 770         __le32  i_size_lo;      /* Size in bytes */
 771         __le32  i_atime;        /* Access time */
 772         __le32  i_ctime;        /* Inode Change time */
 773         __le32  i_mtime;        /* Modification time */
 774         __le32  i_dtime;        /* Deletion Time */
 775         __le16  i_gid;          /* Low 16 bits of Group Id */
 776         __le16  i_links_count;  /* Links count */
 777         __le32  i_blocks_lo;    /* Blocks count */
 778         __le32  i_flags;        /* File flags */
 779         union {
 780                 struct {
 781                         __le32  l_i_version;
 782                 } linux1;
 783                 struct {
 784                         __u32  h_i_translator;
 785                 } hurd1;
 786                 struct {
 787                         __u32  m_i_reserved1;
 788                 } masix1;
 789         } osd1;                         /* OS dependent 1 */
 790         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 791         __le32  i_generation;   /* File version (for NFS) */
 792         __le32  i_file_acl_lo;  /* File ACL */
 793         __le32  i_size_high;
 794         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 795         union {
 796                 struct {
 797                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 798                         __le16  l_i_file_acl_high;
 799                         __le16  l_i_uid_high;   /* these 2 fields */
 800                         __le16  l_i_gid_high;   /* were reserved2[0] */
 801                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 802                         __le16  l_i_reserved;
 803                 } linux2;
 804                 struct {
 805                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 806                         __u16   h_i_mode_high;
 807                         __u16   h_i_uid_high;
 808                         __u16   h_i_gid_high;
 809                         __u32   h_i_author;
 810                 } hurd2;
 811                 struct {
 812                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 813                         __le16  m_i_file_acl_high;
 814                         __u32   m_i_reserved2[2];
 815                 } masix2;
 816         } osd2;                         /* OS dependent 2 */
 817         __le16  i_extra_isize;
 818         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 819         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 820         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 821         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 822         __le32  i_crtime;       /* File Creation time */
 823         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 824         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 825         __le32  i_projid;       /* Project ID */
 826 };
 827
 828 struct move_extent {
 829         __u32 reserved;         /* should be zero */
 830         __u32 donor_fd;         /* donor file descriptor */
 831         __u64 orig_start;       /* logical start offset in block for orig */
 832         __u64 donor_start;      /* logical start offset in block for donor */
 833         __u64 len;              /* block length to be moved */
 834         __u64 moved_len;        /* moved block length */
 835 };
 836
 837 #define EXT4_EPOCH_BITS 2
 838 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 839 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 840
 841 /*
 842  * Extended fields will fit into an inode if the filesystem was formatted
 843  * with large inodes (-I 256 or larger) and there are not currently any EAs
 844  * consuming all of the available space. For new inodes we always reserve
 845  * enough space for the kernel's known extended fields, but for inodes
 846  * created with an old kernel this might not have been the case. None of
 847  * the extended inode fields is critical for correct filesystem operation.
 848  * This macro checks if a certain field fits in the inode. Note that
 849  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 850  */
 851 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 852         ((offsetof(typeof(*ext4_inode), field) +        \
 853           sizeof((ext4_inode)->field))                  \
 854         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 855             (einode)->i_extra_isize))                   \
 856
 857 /*
 858  * We use an encoding that preserves the times for extra epoch "00":
 859  *
 860  * extra  msb of                         adjust for signed
 861  * epoch  32-bit                         32-bit tv_sec to
 862  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 863  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 864  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 865  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 866  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 867  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 868  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 869  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 870  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 871  *
 872  * Note that previous versions of the kernel on 64-bit systems would
 873  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 874  * 1970.  e2fsck will correct this, assuming that it is run on the
 875  * affected filesystem before 2242.
 876  */
 877
 878 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 879 {
 880         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 881         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 882 }
 883
 884 static inline void ext4_decode_extra_time(struct timespec64 *time,
 885                                           __le32 extra)
 886 {
 887         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
 888                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 889         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 890 }
 891
 892 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 893 do {                                                                            \
 894         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 895                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 896                 (raw_inode)->xtime ## _extra =                                  \
 897                                 ext4_encode_extra_time(&(inode)->xtime);        \
 898                 }                                                               \
 899         else    \
 900                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 901 } while (0)
 902
 903 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 904 do {                                                                           \
 905         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 906                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 907         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 908                 (raw_inode)->xtime ## _extra =                                 \
 909                                 ext4_encode_extra_time(&(einode)->xtime);      \
 910 } while (0)
 911
 912 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 913 do {                                                                            \
 914         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 915         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 916                 ext4_decode_extra_time(&(inode)->xtime,                         \
 917                                        raw_inode->xtime ## _extra);             \
 918                 }                                                               \
 919         else                                                                    \
 920                 (inode)->xtime.tv_nsec = 0;                                     \
 921 } while (0)
 922
 923
 924 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 925 do {                                                                           \
 926         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 927                 (einode)->xtime.tv_sec =                                       \
 928                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 929         else                                                                   \
 930                 (einode)->xtime.tv_sec = 0;                                    \
 931         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 932                 ext4_decode_extra_time(&(einode)->xtime,                       \
 933                                        raw_inode->xtime ## _extra);            \
 934         else                                                                   \
 935                 (einode)->xtime.tv_nsec = 0;                                   \
 936 } while (0)
 937
 938 #define i_disk_version osd1.linux1.l_i_version
 939
 940 #if defined(__KERNEL__) || defined(__linux__)
 941 #define i_reserved1     osd1.linux1.l_i_reserved1
 942 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 943 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 944 #define i_uid_low       i_uid
 945 #define i_gid_low       i_gid
 946 #define i_uid_high      osd2.linux2.l_i_uid_high
 947 #define i_gid_high      osd2.linux2.l_i_gid_high
 948 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 949
 950 #elif defined(__GNU__)
 951
 952 #define i_translator    osd1.hurd1.h_i_translator
 953 #define i_uid_high      osd2.hurd2.h_i_uid_high
 954 #define i_gid_high      osd2.hurd2.h_i_gid_high
 955 #define i_author        osd2.hurd2.h_i_author
 956
 957 #elif defined(__masix__)
 958
 959 #define i_reserved1     osd1.masix1.m_i_reserved1
 960 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 961 #define i_reserved2     osd2.masix2.m_i_reserved2
 962
 963 #endif /* defined(__KERNEL__) || defined(__linux__) */
 964
 965 #include "extents_status.h"
 966 #include "fast_commit.h"
 967
 968 /*
 969  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 970  *
 971  * These are needed to avoid lockdep false positives when we need to
 972  * allocate blocks to the quota inode during ext4_map_blocks(), while
 973  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 974  * do quota tracking for the quota inode, this avoids deadlock (as
 975  * well as infinite recursion, since it isn't turtles all the way
 976  * down...)
 977  *
 978  *  I_DATA_SEM_NORMAL - Used for most inodes
 979  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 980  *                        where the second inode has larger inode number
 981  *                        than the first
 982  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 983  */
 984 enum {
 985         I_DATA_SEM_NORMAL = 0,
 986         I_DATA_SEM_OTHER,
 987         I_DATA_SEM_QUOTA,
 988 };
 989
 990
 991 /*
 992  * fourth extended file system inode data in memory
 993  */
 994 struct ext4_inode_info {
 995         __le32  i_data[15];     /* unconverted */
 996         __u32   i_dtime;
 997         ext4_fsblk_t    i_file_acl;
 998
 999         /*
1000          * i_block_group is the number of the block group which contains
1001          * this file's inode.  Constant across the lifetime of the inode,
1002          * it is used for making block allocation decisions - we try to
1003          * place a file's data blocks near its inode block, and new inodes
1004          * near to their parent directory's inode.
1005          */
1006         ext4_group_t    i_block_group;
1007         ext4_lblk_t     i_dir_start_lookup;
1008 #if (BITS_PER_LONG < 64)
1009         unsigned long   i_state_flags;          /* Dynamic state flags */
1010 #endif
1011         unsigned long   i_flags;
1012
1013         /*
1014          * Extended attributes can be read independently of the main file
1015          * data. Taking i_mutex even when reading would cause contention
1016          * between readers of EAs and writers of regular file data, so
1017          * instead we synchronize on xattr_sem when reading or changing
1018          * EAs.
1019          */
1020         struct rw_semaphore xattr_sem;
1021
1022         struct list_head i_orphan;      /* unlinked but open inodes */
1023
1024         /* Fast commit related info */
1025
1026         struct list_head i_fc_list;     /*
1027                                          * inodes that need fast commit
1028                                          * protected by sbi->s_fc_lock.
1029                                          */
1030
1031         /* Fast commit subtid when this inode was committed */
1032         unsigned int i_fc_committed_subtid;
1033
1034         /* Start of lblk range that needs to be committed in this fast commit */
1035         ext4_lblk_t i_fc_lblk_start;
1036
1037         /* End of lblk range that needs to be committed in this fast commit */
1038         ext4_lblk_t i_fc_lblk_len;
1039
1040         /* Number of ongoing updates on this inode */
1041         atomic_t  i_fc_updates;
1042
1043         /* Fast commit wait queue for this inode */
1044         wait_queue_head_t i_fc_wait;
1045
1046         /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1047         struct mutex i_fc_lock;
1048
1049         /*
1050          * i_disksize keeps track of what the inode size is ON DISK, not
1051          * in memory.  During truncate, i_size is set to the new size by
1052          * the VFS prior to calling ext4_truncate(), but the filesystem won't
1053          * set i_disksize to 0 until the truncate is actually under way.
1054          *
1055          * The intent is that i_disksize always represents the blocks which
1056          * are used by this file.  This allows recovery to restart truncate
1057          * on orphans if we crash during truncate.  We actually write i_disksize
1058          * into the on-disk inode when writing inodes out, instead of i_size.
1059          *
1060          * The only time when i_disksize and i_size may be different is when
1061          * a truncate is in progress.  The only things which change i_disksize
1062          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1063          */
1064         loff_t  i_disksize;
1065
1066         /*
1067          * i_data_sem is for serialising ext4_truncate() against
1068          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1069          * data tree are chopped off during truncate. We can't do that in
1070          * ext4 because whenever we perform intermediate commits during
1071          * truncate, the inode and all the metadata blocks *must* be in a
1072          * consistent state which allows truncation of the orphans to restart
1073          * during recovery.  Hence we must fix the get_block-vs-truncate race
1074          * by other means, so we have i_data_sem.
1075          */
1076         struct rw_semaphore i_data_sem;
1077         /*
1078          * i_mmap_sem is for serializing page faults with truncate / punch hole
1079          * operations. We have to make sure that new page cannot be faulted in
1080          * a section of the inode that is being punched. We cannot easily use
1081          * i_data_sem for this since we need protection for the whole punch
1082          * operation and i_data_sem ranks below transaction start so we have
1083          * to occasionally drop it.
1084          */
1085         struct rw_semaphore i_mmap_sem;
1086         struct inode vfs_inode;
1087         struct jbd2_inode *jinode;
1088
1089         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1090
1091         /*
1092          * File creation time. Its function is same as that of
1093          * struct timespec64 i_{a,c,m}time in the generic inode.
1094          */
1095         struct timespec64 i_crtime;
1096
1097         /* mballoc */
1098         atomic_t i_prealloc_active;
1099         struct list_head i_prealloc_list;
1100         spinlock_t i_prealloc_lock;
1101
1102         /* extents status tree */
1103         struct ext4_es_tree i_es_tree;
1104         rwlock_t i_es_lock;
1105         struct list_head i_es_list;
1106         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1107         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1108         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1109                                            extents to shrink. Protected by
1110                                            i_es_lock  */
1111
1112         /* ialloc */
1113         ext4_group_t    i_last_alloc_group;
1114
1115         /* allocation reservation info for delalloc */
1116         /* In case of bigalloc, this refer to clusters rather than blocks */
1117         unsigned int i_reserved_data_blocks;
1118
1119         /* pending cluster reservations for bigalloc file systems */
1120         struct ext4_pending_tree i_pending_tree;
1121
1122         /* on-disk additional length */
1123         __u16 i_extra_isize;
1124
1125         /* Indicate the inline data space. */
1126         u16 i_inline_off;
1127         u16 i_inline_size;
1128
1129 #ifdef CONFIG_QUOTA
1130         /* quota space reservation, managed internally by quota code */
1131         qsize_t i_reserved_quota;
1132 #endif
1133
1134         /* Lock protecting lists below */
1135         spinlock_t i_completed_io_lock;
1136         /*
1137          * Completed IOs that need unwritten extents handling and have
1138          * transaction reserved
1139          */
1140         struct list_head i_rsv_conversion_list;
1141         struct work_struct i_rsv_conversion_work;
1142         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1143
1144         spinlock_t i_block_reservation_lock;
1145
1146         /*
1147          * Transactions that contain inode's metadata needed to complete
1148          * fsync and fdatasync, respectively.
1149          */
1150         tid_t i_sync_tid;
1151         tid_t i_datasync_tid;
1152
1153 #ifdef CONFIG_QUOTA
1154         struct dquot *i_dquot[MAXQUOTAS];
1155 #endif
1156
1157         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1158         __u32 i_csum_seed;
1159
1160         kprojid_t i_projid;
1161 };
1162
1163 /*
1164  * File system states
1165  */
1166 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1167 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1168 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1169 #define EXT4_FC_REPLAY                  0x0020  /* Fast commit replay ongoing */
1170
1171 /*
1172  * Misc. filesystem flags
1173  */
1174 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1175 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1176 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1177
1178 /*
1179  * Mount flags set via mount options or defaults
1180  */
1181 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1182 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1183 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1184 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1185 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1186 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1187 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1188 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1189 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1190 #ifdef CONFIG_FS_DAX
1191 #define EXT4_MOUNT_DAX_ALWAYS           0x00200 /* Direct Access */
1192 #else
1193 #define EXT4_MOUNT_DAX_ALWAYS           0
1194 #endif
1195 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1196 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1197 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1198 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1199 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1200 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1201 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1202 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1203 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1204 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1205 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1206 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1207                                                  * enable enforcement for hidden
1208                                                  * quota files */
1209 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1210                                                   * enforcement for hidden quota
1211                                                   * files */
1212 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1213                                                   * enforcement */
1214 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1215 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1216 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1217 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1218 #define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000
1219 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1220 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1221 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1222 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1223 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1224
1225 /*
1226  * Mount flags set either automatically (could not be set by mount option)
1227  * based on per file system feature or property or in special cases such as
1228  * distinguishing between explicit mount option definition and default.
1229  */
1230 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1231                                                       specified delalloc */
1232 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1233                                                       size of blocksize * 8
1234                                                       blocks */
1235 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1236                                                       file systems */
1237 #define EXT4_MOUNT2_DAX_NEVER           0x00000008 /* Do not allow Direct Access */
1238 #define EXT4_MOUNT2_DAX_INODE           0x00000010 /* For printing options only */
1239
1240 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1241                                                 specified journal checksum */
1242
1243 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1244
1245 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1246                                                 ~EXT4_MOUNT_##opt
1247 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1248                                                 EXT4_MOUNT_##opt
1249 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1250                                          EXT4_MOUNT_##opt)
1251
1252 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1253                                                 ~EXT4_MOUNT2_##opt
1254 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1255                                                 EXT4_MOUNT2_##opt
1256 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1257                                          EXT4_MOUNT2_##opt)
1258
1259 #define ext4_test_and_set_bit           __test_and_set_bit_le
1260 #define ext4_set_bit                    __set_bit_le
1261 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1262 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1263 #define ext4_clear_bit                  __clear_bit_le
1264 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1265 #define ext4_test_bit                   test_bit_le
1266 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1267 #define ext4_find_next_bit              find_next_bit_le
1268
1269 extern void ext4_set_bits(void *bm, int cur, int len);
1270
1271 /*
1272  * Maximal mount counts between two filesystem checks
1273  */
1274 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1275 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1276
1277 /*
1278  * Behaviour when detecting errors
1279  */
1280 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1281 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1282 #define EXT4_ERRORS_PANIC               3       /* Panic */
1283 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1284
1285 /* Metadata checksum algorithm codes */
1286 #define EXT4_CRC32C_CHKSUM              1
1287
1288 /*
1289  * Structure of the super block
1290  */
1291 struct ext4_super_block {
1292 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1293         __le32  s_blocks_count_lo;      /* Blocks count */
1294         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1295         __le32  s_free_blocks_count_lo; /* Free blocks count */
1296 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1297         __le32  s_first_data_block;     /* First Data Block */
1298         __le32  s_log_block_size;       /* Block size */
1299         __le32  s_log_cluster_size;     /* Allocation cluster size */
1300 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1301         __le32  s_clusters_per_group;   /* # Clusters per group */
1302         __le32  s_inodes_per_group;     /* # Inodes per group */
1303         __le32  s_mtime;                /* Mount time */
1304 /*30*/  __le32  s_wtime;                /* Write time */
1305         __le16  s_mnt_count;            /* Mount count */
1306         __le16  s_max_mnt_count;        /* Maximal mount count */
1307         __le16  s_magic;                /* Magic signature */
1308         __le16  s_state;                /* File system state */
1309         __le16  s_errors;               /* Behaviour when detecting errors */
1310         __le16  s_minor_rev_level;      /* minor revision level */
1311 /*40*/  __le32  s_lastcheck;            /* time of last check */
1312         __le32  s_checkinterval;        /* max. time between checks */
1313         __le32  s_creator_os;           /* OS */
1314         __le32  s_rev_level;            /* Revision level */
1315 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1316         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1317         /*
1318          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1319          *
1320          * Note: the difference between the compatible feature set and
1321          * the incompatible feature set is that if there is a bit set
1322          * in the incompatible feature set that the kernel doesn't
1323          * know about, it should refuse to mount the filesystem.
1324          *
1325          * e2fsck's requirements are more strict; if it doesn't know
1326          * about a feature in either the compatible or incompatible
1327          * feature set, it must abort and not try to meddle with
1328          * things it doesn't understand...
1329          */
1330         __le32  s_first_ino;            /* First non-reserved inode */
1331         __le16  s_inode_size;           /* size of inode structure */
1332         __le16  s_block_group_nr;       /* block group # of this superblock */
1333         __le32  s_feature_compat;       /* compatible feature set */
1334 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1335         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1336 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1337 /*78*/  char    s_volume_name[16];      /* volume name */
1338 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1339 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1340         /*
1341          * Performance hints.  Directory preallocation should only
1342          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1343          */
1344         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1345         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1346         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1347         /*
1348          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1349          */
1350 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1351 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1352         __le32  s_journal_dev;          /* device number of journal file */
1353         __le32  s_last_orphan;          /* start of list of inodes to delete */
1354         __le32  s_hash_seed[4];         /* HTREE hash seed */
1355         __u8    s_def_hash_version;     /* Default hash version to use */
1356         __u8    s_jnl_backup_type;
1357         __le16  s_desc_size;            /* size of group descriptor */
1358 /*100*/ __le32  s_default_mount_opts;
1359         __le32  s_first_meta_bg;        /* First metablock block group */
1360         __le32  s_mkfs_time;            /* When the filesystem was created */
1361         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1362         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1363 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1364         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1365         __le32  s_free_blocks_count_hi; /* Free blocks count */
1366         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1367         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1368         __le32  s_flags;                /* Miscellaneous flags */
1369         __le16  s_raid_stride;          /* RAID stride */
1370         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1371         __le64  s_mmp_block;            /* Block for multi-mount protection */
1372         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1373         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1374         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1375         __u8    s_encryption_level;     /* versioning level for encryption */
1376         __u8    s_reserved_pad;         /* Padding to next 32bits */
1377         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1378         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1379         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1380         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1381                                               snapshot's future use */
1382         __le32  s_snapshot_list;        /* inode number of the head of the
1383                                            on-disk snapshot list */
1384 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1385         __le32  s_error_count;          /* number of fs errors */
1386         __le32  s_first_error_time;     /* first time an error happened */
1387         __le32  s_first_error_ino;      /* inode involved in first error */
1388         __le64  s_first_error_block;    /* block involved of first error */
1389         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1390         __le32  s_first_error_line;     /* line number where error happened */
1391         __le32  s_last_error_time;      /* most recent time of an error */
1392         __le32  s_last_error_ino;       /* inode involved in last error */
1393         __le32  s_last_error_line;      /* line number where error happened */
1394         __le64  s_last_error_block;     /* block involved of last error */
1395         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1396 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1397         __u8    s_mount_opts[64];
1398         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1399         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1400         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1401         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1402         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1403         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1404         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1405         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1406         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1407         __u8    s_wtime_hi;
1408         __u8    s_mtime_hi;
1409         __u8    s_mkfs_time_hi;
1410         __u8    s_lastcheck_hi;
1411         __u8    s_first_error_time_hi;
1412         __u8    s_last_error_time_hi;
1413         __u8    s_first_error_errcode;
1414         __u8    s_last_error_errcode;
1415         __le16  s_encoding;             /* Filename charset encoding */
1416         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1417         __le32  s_reserved[95];         /* Padding to the end of the block */
1418         __le32  s_checksum;             /* crc32c(superblock) */
1419 };
1420
1421 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1422
1423 #ifdef __KERNEL__
1424
1425 /*
1426  * run-time mount flags
1427  */
1428 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1429 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1430 #define EXT4_MF_FC_INELIGIBLE           0x0004  /* Fast commit ineligible */
1431 #define EXT4_MF_FC_COMMITTING           0x0008  /* File system underoing a fast
1432                                                  * commit.
1433                                                  */
1434
1435 #ifdef CONFIG_FS_ENCRYPTION
1436 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL)
1437 #else
1438 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1439 #endif
1440
1441 /* Number of quota types we support */
1442 #define EXT4_MAXQUOTAS 3
1443
1444 #define EXT4_ENC_UTF8_12_1      1
1445
1446 /*
1447  * fourth extended-fs super-block data in memory
1448  */
1449 struct ext4_sb_info {
1450         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1451         unsigned long s_inodes_per_block;/* Number of inodes per block */
1452         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1453         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1454         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1455         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1456         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1457         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1458         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1459         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1460         unsigned long s_overhead;  /* # of fs overhead clusters */
1461         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1462         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1463         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1464         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1465         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1466         struct buffer_head * __rcu *s_group_desc;
1467         unsigned int s_mount_opt;
1468         unsigned int s_mount_opt2;
1469         unsigned int s_mount_flags;
1470         unsigned int s_def_mount_opt;
1471         ext4_fsblk_t s_sb_block;
1472         atomic64_t s_resv_clusters;
1473         kuid_t s_resuid;
1474         kgid_t s_resgid;
1475         unsigned short s_mount_state;
1476         unsigned short s_pad;
1477         int s_addr_per_block_bits;
1478         int s_desc_per_block_bits;
1479         int s_inode_size;
1480         int s_first_ino;
1481         unsigned int s_inode_readahead_blks;
1482         unsigned int s_inode_goal;
1483         u32 s_hash_seed[4];
1484         int s_def_hash_version;
1485         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1486         struct percpu_counter s_freeclusters_counter;
1487         struct percpu_counter s_freeinodes_counter;
1488         struct percpu_counter s_dirs_counter;
1489         struct percpu_counter s_dirtyclusters_counter;
1490         struct blockgroup_lock *s_blockgroup_lock;
1491         struct proc_dir_entry *s_proc;
1492         struct kobject s_kobj;
1493         struct completion s_kobj_unregister;
1494         struct super_block *s_sb;
1495
1496         /* Journaling */
1497         struct journal_s *s_journal;
1498         struct list_head s_orphan;
1499         struct mutex s_orphan_lock;
1500         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1501         unsigned long s_commit_interval;
1502         u32 s_max_batch_time;
1503         u32 s_min_batch_time;
1504         struct block_device *s_journal_bdev;
1505 #ifdef CONFIG_QUOTA
1506         /* Names of quota files with journalled quota */
1507         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1508         int s_jquota_fmt;                       /* Format of quota to use */
1509 #endif
1510         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1511         struct ext4_system_blocks __rcu *s_system_blks;
1512
1513 #ifdef EXTENTS_STATS
1514         /* ext4 extents stats */
1515         unsigned long s_ext_min;
1516         unsigned long s_ext_max;
1517         unsigned long s_depth_max;
1518         spinlock_t s_ext_stats_lock;
1519         unsigned long s_ext_blocks;
1520         unsigned long s_ext_extents;
1521 #endif
1522
1523         /* for buddy allocator */
1524         struct ext4_group_info ** __rcu *s_group_info;
1525         struct inode *s_buddy_cache;
1526         spinlock_t s_md_lock;
1527         unsigned short *s_mb_offsets;
1528         unsigned int *s_mb_maxs;
1529         unsigned int s_group_info_size;
1530         unsigned int s_mb_free_pending;
1531         struct list_head s_freed_data_list;     /* List of blocks to be freed
1532                                                    after commit completed */
1533
1534         /* tunables */
1535         unsigned long s_stripe;
1536         unsigned int s_mb_stream_request;
1537         unsigned int s_mb_max_to_scan;
1538         unsigned int s_mb_min_to_scan;
1539         unsigned int s_mb_stats;
1540         unsigned int s_mb_order2_reqs;
1541         unsigned int s_mb_group_prealloc;
1542         unsigned int s_mb_max_inode_prealloc;
1543         unsigned int s_max_dir_size_kb;
1544         /* where last allocation was done - for stream allocation */
1545         unsigned long s_mb_last_group;
1546         unsigned long s_mb_last_start;
1547         unsigned int s_mb_prefetch;
1548         unsigned int s_mb_prefetch_limit;
1549
1550         /* stats for buddy allocator */
1551         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1552         atomic_t s_bal_success; /* we found long enough chunks */
1553         atomic_t s_bal_allocated;       /* in blocks */
1554         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1555         atomic_t s_bal_goals;   /* goal hits */
1556         atomic_t s_bal_breaks;  /* too long searches */
1557         atomic_t s_bal_2orders; /* 2^order hits */
1558         spinlock_t s_bal_lock;
1559         unsigned long s_mb_buddies_generated;
1560         unsigned long long s_mb_generation_time;
1561         atomic_t s_mb_lost_chunks;
1562         atomic_t s_mb_preallocated;
1563         atomic_t s_mb_discarded;
1564         atomic_t s_lock_busy;
1565
1566         /* locality groups */
1567         struct ext4_locality_group __percpu *s_locality_groups;
1568
1569         /* for write statistics */
1570         unsigned long s_sectors_written_start;
1571         u64 s_kbytes_written;
1572
1573         /* the size of zero-out chunk */
1574         unsigned int s_extent_max_zeroout_kb;
1575
1576         unsigned int s_log_groups_per_flex;
1577         struct flex_groups * __rcu *s_flex_groups;
1578         ext4_group_t s_flex_groups_allocated;
1579
1580         /* workqueue for reserved extent conversions (buffered io) */
1581         struct workqueue_struct *rsv_conversion_wq;
1582
1583         /* timer for periodic error stats printing */
1584         struct timer_list s_err_report;
1585
1586         /* Lazy inode table initialization info */
1587         struct ext4_li_request *s_li_request;
1588         /* Wait multiplier for lazy initialization thread */
1589         unsigned int s_li_wait_mult;
1590
1591         /* Kernel thread for multiple mount protection */
1592         struct task_struct *s_mmp_tsk;
1593
1594         /* record the last minlen when FITRIM is called. */
1595         atomic_t s_last_trim_minblks;
1596
1597         /* Reference to checksum algorithm driver via cryptoapi */
1598         struct crypto_shash *s_chksum_driver;
1599
1600         /* Precomputed FS UUID checksum for seeding other checksums */
1601         __u32 s_csum_seed;
1602
1603         /* Reclaim extents from extent status tree */
1604         struct shrinker s_es_shrinker;
1605         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1606         long s_es_nr_inode;
1607         struct ext4_es_stats s_es_stats;
1608         struct mb_cache *s_ea_block_cache;
1609         struct mb_cache *s_ea_inode_cache;
1610         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1611
1612         /* Ratelimit ext4 messages. */
1613         struct ratelimit_state s_err_ratelimit_state;
1614         struct ratelimit_state s_warning_ratelimit_state;
1615         struct ratelimit_state s_msg_ratelimit_state;
1616         atomic_t s_warning_count;
1617         atomic_t s_msg_count;
1618
1619         /* Encryption policy for '-o test_dummy_encryption' */
1620         struct fscrypt_dummy_policy s_dummy_enc_policy;
1621
1622         /*
1623          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1624          * or EXTENTS flag.
1625          */
1626         struct percpu_rw_semaphore s_writepages_rwsem;
1627         struct dax_device *s_daxdev;
1628 #ifdef CONFIG_EXT4_DEBUG
1629         unsigned long s_simulate_fail;
1630 #endif
1631         /* Record the errseq of the backing block device */
1632         errseq_t s_bdev_wb_err;
1633         spinlock_t s_bdev_wb_lock;
1634
1635         /* Ext4 fast commit stuff */
1636         atomic_t s_fc_subtid;
1637         atomic_t s_fc_ineligible_updates;
1638         /*
1639          * After commit starts, the main queue gets locked, and the further
1640          * updates get added in the staging queue.
1641          */
1642 #define FC_Q_MAIN       0
1643 #define FC_Q_STAGING    1
1644         struct list_head s_fc_q[2];     /* Inodes staged for fast commit
1645                                          * that have data changes in them.
1646                                          */
1647         struct list_head s_fc_dentry_q[2];      /* directory entry updates */
1648         unsigned int s_fc_bytes;
1649         /*
1650          * Main fast commit lock. This lock protects accesses to the
1651          * following fields:
1652          * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1653          */
1654         spinlock_t s_fc_lock;
1655         struct buffer_head *s_fc_bh;
1656         struct ext4_fc_stats s_fc_stats;
1657         u64 s_fc_avg_commit_time;
1658 #ifdef CONFIG_EXT4_DEBUG
1659         int s_fc_debug_max_replay;
1660 #endif
1661         struct ext4_fc_replay_state s_fc_replay_state;
1662 };
1663
1664 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1665 {
1666         return sb->s_fs_info;
1667 }
1668 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1669 {
1670         return container_of(inode, struct ext4_inode_info, vfs_inode);
1671 }
1672
1673 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1674 {
1675         return ino == EXT4_ROOT_INO ||
1676                 (ino >= EXT4_FIRST_INO(sb) &&
1677                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1678 }
1679
1680 /*
1681  * Returns: sbi->field[index]
1682  * Used to access an array element from the following sbi fields which require
1683  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1684  * - s_group_desc
1685  * - s_group_info
1686  * - s_flex_group
1687  */
1688 #define sbi_array_rcu_deref(sbi, field, index)                             \
1689 ({                                                                         \
1690         typeof(*((sbi)->field)) _v;                                        \
1691         rcu_read_lock();                                                   \
1692         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1693         rcu_read_unlock();                                                 \
1694         _v;                                                                \
1695 })
1696
1697 /*
1698  * Simulate_fail codes
1699  */
1700 #define EXT4_SIM_BBITMAP_EIO    1
1701 #define EXT4_SIM_BBITMAP_CRC    2
1702 #define EXT4_SIM_IBITMAP_EIO    3
1703 #define EXT4_SIM_IBITMAP_CRC    4
1704 #define EXT4_SIM_INODE_EIO      5
1705 #define EXT4_SIM_INODE_CRC      6
1706 #define EXT4_SIM_DIRBLOCK_EIO   7
1707 #define EXT4_SIM_DIRBLOCK_CRC   8
1708
1709 static inline bool ext4_simulate_fail(struct super_block *sb,
1710                                      unsigned long code)
1711 {
1712 #ifdef CONFIG_EXT4_DEBUG
1713         struct ext4_sb_info *sbi = EXT4_SB(sb);
1714
1715         if (unlikely(sbi->s_simulate_fail == code)) {
1716                 sbi->s_simulate_fail = 0;
1717                 return true;
1718         }
1719 #endif
1720         return false;
1721 }
1722
1723 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1724                                          struct buffer_head *bh,
1725                                          unsigned long code)
1726 {
1727         if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1728                 clear_buffer_uptodate(bh);
1729 }
1730
1731 /*
1732  * Error number codes for s_{first,last}_error_errno
1733  *
1734  * Linux errno numbers are architecture specific, so we need to translate
1735  * them into something which is architecture independent.   We don't define
1736  * codes for all errno's; just the ones which are most likely to be the cause
1737  * of an ext4_error() call.
1738  */
1739 #define EXT4_ERR_UNKNOWN         1
1740 #define EXT4_ERR_EIO             2
1741 #define EXT4_ERR_ENOMEM          3
1742 #define EXT4_ERR_EFSBADCRC       4
1743 #define EXT4_ERR_EFSCORRUPTED    5
1744 #define EXT4_ERR_ENOSPC          6
1745 #define EXT4_ERR_ENOKEY          7
1746 #define EXT4_ERR_EROFS           8
1747 #define EXT4_ERR_EFBIG           9
1748 #define EXT4_ERR_EEXIST         10
1749 #define EXT4_ERR_ERANGE         11
1750 #define EXT4_ERR_EOVERFLOW      12
1751 #define EXT4_ERR_EBUSY          13
1752 #define EXT4_ERR_ENOTDIR        14
1753 #define EXT4_ERR_ENOTEMPTY      15
1754 #define EXT4_ERR_ESHUTDOWN      16
1755 #define EXT4_ERR_EFAULT         17
1756
1757 /*
1758  * Inode dynamic state flags
1759  */
1760 enum {
1761         EXT4_STATE_JDATA,               /* journaled data exists */
1762         EXT4_STATE_NEW,                 /* inode is newly created */
1763         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1764         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1765         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1766         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1767         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1768         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1769         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1770         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1771         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1772         EXT4_STATE_FC_COMMITTING,       /* Fast commit ongoing */
1773 };
1774
1775 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1776 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1777 {                                                                       \
1778         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1779 }                                                                       \
1780 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1781 {                                                                       \
1782         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1783 }                                                                       \
1784 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1785 {                                                                       \
1786         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1787 }
1788
1789 /* Add these declarations here only so that these functions can be
1790  * found by name.  Otherwise, they are very hard to locate. */
1791 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1792 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1793 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1794 EXT4_INODE_BIT_FNS(flag, flags, 0)
1795
1796 /* Add these declarations here only so that these functions can be
1797  * found by name.  Otherwise, they are very hard to locate. */
1798 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1799 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1800 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1801 #if (BITS_PER_LONG < 64)
1802 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1803
1804 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1805 {
1806         (ei)->i_state_flags = 0;
1807 }
1808 #else
1809 EXT4_INODE_BIT_FNS(state, flags, 32)
1810
1811 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1812 {
1813         /* We depend on the fact that callers will set i_flags */
1814 }
1815 #endif
1816 #else
1817 /* Assume that user mode programs are passing in an ext4fs superblock, not
1818  * a kernel struct super_block.  This will allow us to call the feature-test
1819  * macros from user land. */
1820 #define EXT4_SB(sb)     (sb)
1821 #endif
1822
1823 static inline bool ext4_verity_in_progress(struct inode *inode)
1824 {
1825         return IS_ENABLED(CONFIG_FS_VERITY) &&
1826                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1827 }
1828
1829 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1830
1831 /*
1832  * Codes for operating systems
1833  */
1834 #define EXT4_OS_LINUX           0
1835 #define EXT4_OS_HURD            1
1836 #define EXT4_OS_MASIX           2
1837 #define EXT4_OS_FREEBSD         3
1838 #define EXT4_OS_LITES           4
1839
1840 /*
1841  * Revision levels
1842  */
1843 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1844 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1845
1846 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1847 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1848
1849 #define EXT4_GOOD_OLD_INODE_SIZE 128
1850
1851 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1852 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1853 #define EXT4_TIMESTAMP_MIN              S32_MIN
1854
1855 /*
1856  * Feature set definitions
1857  */
1858
1859 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1860 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1861 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1862 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1863 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1864 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1865 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1866 #define EXT4_FEATURE_COMPAT_FAST_COMMIT         0x0400
1867 #define EXT4_FEATURE_COMPAT_STABLE_INODES       0x0800
1868
1869 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1870 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1871 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1872 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1873 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1874 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1875 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1876 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1877 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1878 /*
1879  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1880  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1881  * all other data structures' checksums.  However, the METADATA_CSUM and
1882  * GDT_CSUM bits are mutually exclusive.
1883  */
1884 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1885 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1886 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1887 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
1888
1889 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1890 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1891 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1892 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1893 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1894 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1895 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1896 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1897 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1898 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1899 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1900 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1901 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1902 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1903 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1904 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
1905
1906 extern void ext4_update_dynamic_rev(struct super_block *sb);
1907
1908 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1909 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1910 { \
1911         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1912                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1913 } \
1914 static inline void ext4_set_feature_##name(struct super_block *sb) \
1915 { \
1916         ext4_update_dynamic_rev(sb); \
1917         EXT4_SB(sb)->s_es->s_feature_compat |= \
1918                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1919 } \
1920 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1921 { \
1922         EXT4_SB(sb)->s_es->s_feature_compat &= \
1923                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1924 }
1925
1926 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1927 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1928 { \
1929         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1930                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1931 } \
1932 static inline void ext4_set_feature_##name(struct super_block *sb) \
1933 { \
1934         ext4_update_dynamic_rev(sb); \
1935         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1936                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1937 } \
1938 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1939 { \
1940         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1941                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1942 }
1943
1944 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1945 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1946 { \
1947         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1948                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1949 } \
1950 static inline void ext4_set_feature_##name(struct super_block *sb) \
1951 { \
1952         ext4_update_dynamic_rev(sb); \
1953         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1954                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1955 } \
1956 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1957 { \
1958         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1959                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1960 }
1961
1962 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1963 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1964 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1965 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1966 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1967 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1968 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1969 EXT4_FEATURE_COMPAT_FUNCS(fast_commit,          FAST_COMMIT)
1970 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,        STABLE_INODES)
1971
1972 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1973 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1974 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1975 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1976 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1977 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1978 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1979 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1980 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1981 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1982 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1983 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1984 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
1985
1986 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1987 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1988 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1989 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1990 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1991 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1992 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1993 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1994 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1995 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1996 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1997 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1998 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1999 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
2000 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
2001 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
2002
2003 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2004 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2005                                          EXT4_FEATURE_INCOMPAT_META_BG)
2006 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2007                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2008                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2009
2010 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2011 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2012                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2013                                          EXT4_FEATURE_INCOMPAT_META_BG)
2014 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2015                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2016                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2017
2018 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2019 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2020                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2021                                          EXT4_FEATURE_INCOMPAT_META_BG| \
2022                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
2023                                          EXT4_FEATURE_INCOMPAT_64BIT| \
2024                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2025                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
2026                                          EXT4_FEATURE_INCOMPAT_MMP | \
2027                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2028                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2029                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2030                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2031                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
2032 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2033                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2034                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2035                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2036                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2037                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2038                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2039                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2040                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2041                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
2042                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
2043                                          EXT4_FEATURE_RO_COMPAT_VERITY)
2044
2045 #define EXTN_FEATURE_FUNCS(ver) \
2046 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2047 { \
2048         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2049                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2050 } \
2051 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2052 { \
2053         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2054                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2055 } \
2056 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2057 { \
2058         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2059                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2060 }
2061
2062 EXTN_FEATURE_FUNCS(2)
2063 EXTN_FEATURE_FUNCS(3)
2064 EXTN_FEATURE_FUNCS(4)
2065
2066 static inline bool ext4_has_compat_features(struct super_block *sb)
2067 {
2068         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2069 }
2070 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2071 {
2072         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2073 }
2074 static inline bool ext4_has_incompat_features(struct super_block *sb)
2075 {
2076         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2077 }
2078
2079 /*
2080  * Superblock flags
2081  */
2082 #define EXT4_FLAGS_RESIZING     0
2083 #define EXT4_FLAGS_SHUTDOWN     1
2084 #define EXT4_FLAGS_BDEV_IS_DAX  2
2085
2086 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2087 {
2088         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2089 }
2090
2091
2092 /*
2093  * Default values for user and/or group using reserved blocks
2094  */
2095 #define EXT4_DEF_RESUID         0
2096 #define EXT4_DEF_RESGID         0
2097
2098 /*
2099  * Default project ID
2100  */
2101 #define EXT4_DEF_PROJID         0
2102
2103 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
2104
2105 /*
2106  * Default mount options
2107  */
2108 #define EXT4_DEFM_DEBUG         0x0001
2109 #define EXT4_DEFM_BSDGROUPS     0x0002
2110 #define EXT4_DEFM_XATTR_USER    0x0004
2111 #define EXT4_DEFM_ACL           0x0008
2112 #define EXT4_DEFM_UID16         0x0010
2113 #define EXT4_DEFM_JMODE         0x0060
2114 #define EXT4_DEFM_JMODE_DATA    0x0020
2115 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2116 #define EXT4_DEFM_JMODE_WBACK   0x0060
2117 #define EXT4_DEFM_NOBARRIER     0x0100
2118 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2119 #define EXT4_DEFM_DISCARD       0x0400
2120 #define EXT4_DEFM_NODELALLOC    0x0800
2121
2122 /*
2123  * Default journal batch times
2124  */
2125 #define EXT4_DEF_MIN_BATCH_TIME 0
2126 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2127
2128 /*
2129  * Minimum number of groups in a flexgroup before we separate out
2130  * directories into the first block group of a flexgroup
2131  */
2132 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2133
2134 /*
2135  * Structure of a directory entry
2136  */
2137 #define EXT4_NAME_LEN 255
2138
2139 struct ext4_dir_entry {
2140         __le32  inode;                  /* Inode number */
2141         __le16  rec_len;                /* Directory entry length */
2142         __le16  name_len;               /* Name length */
2143         char    name[EXT4_NAME_LEN];    /* File name */
2144 };
2145
2146 /*
2147  * The new version of the directory entry.  Since EXT4 structures are
2148  * stored in intel byte order, and the name_len field could never be
2149  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2150  * file_type field.
2151  */
2152 struct ext4_dir_entry_2 {
2153         __le32  inode;                  /* Inode number */
2154         __le16  rec_len;                /* Directory entry length */
2155         __u8    name_len;               /* Name length */
2156         __u8    file_type;              /* See file type macros EXT4_FT_* below */
2157         char    name[EXT4_NAME_LEN];    /* File name */
2158 };
2159
2160 /*
2161  * This is a bogus directory entry at the end of each leaf block that
2162  * records checksums.
2163  */
2164 struct ext4_dir_entry_tail {
2165         __le32  det_reserved_zero1;     /* Pretend to be unused */
2166         __le16  det_rec_len;            /* 12 */
2167         __u8    det_reserved_zero2;     /* Zero name length */
2168         __u8    det_reserved_ft;        /* 0xDE, fake file type */
2169         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
2170 };
2171
2172 #define EXT4_DIRENT_TAIL(block, blocksize) \
2173         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2174                                         ((blocksize) - \
2175                                          sizeof(struct ext4_dir_entry_tail))))
2176
2177 /*
2178  * Ext4 directory file types.  Only the low 3 bits are used.  The
2179  * other bits are reserved for now.
2180  */
2181 #define EXT4_FT_UNKNOWN         0
2182 #define EXT4_FT_REG_FILE        1
2183 #define EXT4_FT_DIR             2
2184 #define EXT4_FT_CHRDEV          3
2185 #define EXT4_FT_BLKDEV          4
2186 #define EXT4_FT_FIFO            5
2187 #define EXT4_FT_SOCK            6
2188 #define EXT4_FT_SYMLINK         7
2189
2190 #define EXT4_FT_MAX             8
2191
2192 #define EXT4_FT_DIR_CSUM        0xDE
2193
2194 /*
2195  * EXT4_DIR_PAD defines the directory entries boundaries
2196  *
2197  * NOTE: It must be a multiple of 4
2198  */
2199 #define EXT4_DIR_PAD                    4
2200 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2201 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
2202                                          ~EXT4_DIR_ROUND)
2203 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2204
2205 /*
2206  * If we ever get support for fs block sizes > page_size, we'll need
2207  * to remove the #if statements in the next two functions...
2208  */
2209 static inline unsigned int
2210 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2211 {
2212         unsigned len = le16_to_cpu(dlen);
2213
2214 #if (PAGE_SIZE >= 65536)
2215         if (len == EXT4_MAX_REC_LEN || len == 0)
2216                 return blocksize;
2217         return (len & 65532) | ((len & 3) << 16);
2218 #else
2219         return len;
2220 #endif
2221 }
2222
2223 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2224 {
2225         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2226                 BUG();
2227 #if (PAGE_SIZE >= 65536)
2228         if (len < 65536)
2229                 return cpu_to_le16(len);
2230         if (len == blocksize) {
2231                 if (blocksize == 65536)
2232                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2233                 else
2234                         return cpu_to_le16(0);
2235         }
2236         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2237 #else
2238         return cpu_to_le16(len);
2239 #endif
2240 }
2241
2242 /*
2243  * Hash Tree Directory indexing
2244  * (c) Daniel Phillips, 2001
2245  */
2246
2247 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2248                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2249 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2250                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2251 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2252
2253 /* Legal values for the dx_root hash_version field: */
2254
2255 #define DX_HASH_LEGACY                  0
2256 #define DX_HASH_HALF_MD4                1
2257 #define DX_HASH_TEA                     2
2258 #define DX_HASH_LEGACY_UNSIGNED         3
2259 #define DX_HASH_HALF_MD4_UNSIGNED       4
2260 #define DX_HASH_TEA_UNSIGNED            5
2261
2262 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2263                               const void *address, unsigned int length)
2264 {
2265         struct {
2266                 struct shash_desc shash;
2267                 char ctx[4];
2268         } desc;
2269
2270         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2271
2272         desc.shash.tfm = sbi->s_chksum_driver;
2273         *(u32 *)desc.ctx = crc;
2274
2275         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2276
2277         return *(u32 *)desc.ctx;
2278 }
2279
2280 #ifdef __KERNEL__
2281
2282 /* hash info structure used by the directory hash */
2283 struct dx_hash_info
2284 {
2285         u32             hash;
2286         u32             minor_hash;
2287         int             hash_version;
2288         u32             *seed;
2289 };
2290
2291
2292 /* 32 and 64 bit signed EOF for dx directories */
2293 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2294 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2295
2296
2297 /*
2298  * Control parameters used by ext4_htree_next_block
2299  */
2300 #define HASH_NB_ALWAYS          1
2301
2302 struct ext4_filename {
2303         const struct qstr *usr_fname;
2304         struct fscrypt_str disk_name;
2305         struct dx_hash_info hinfo;
2306 #ifdef CONFIG_FS_ENCRYPTION
2307         struct fscrypt_str crypto_buf;
2308 #endif
2309 #ifdef CONFIG_UNICODE
2310         struct fscrypt_str cf_name;
2311 #endif
2312 };
2313
2314 #define fname_name(p) ((p)->disk_name.name)
2315 #define fname_len(p)  ((p)->disk_name.len)
2316
2317 /*
2318  * Describe an inode's exact location on disk and in memory
2319  */
2320 struct ext4_iloc
2321 {
2322         struct buffer_head *bh;
2323         unsigned long offset;
2324         ext4_group_t block_group;
2325 };
2326
2327 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2328 {
2329         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2330 }
2331
2332 static inline bool ext4_is_quota_file(struct inode *inode)
2333 {
2334         return IS_NOQUOTA(inode) &&
2335                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2336 }
2337
2338 /*
2339  * This structure is stuffed into the struct file's private_data field
2340  * for directories.  It is where we put information so that we can do
2341  * readdir operations in hash tree order.
2342  */
2343 struct dir_private_info {
2344         struct rb_root  root;
2345         struct rb_node  *curr_node;
2346         struct fname    *extra_fname;
2347         loff_t          last_pos;
2348         __u32           curr_hash;
2349         __u32           curr_minor_hash;
2350         __u32           next_hash;
2351 };
2352
2353 /* calculate the first block number of the group */
2354 static inline ext4_fsblk_t
2355 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2356 {
2357         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2358                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2359 }
2360
2361 /*
2362  * Special error return code only used by dx_probe() and its callers.
2363  */
2364 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2365
2366 /* htree levels for ext4 */
2367 #define EXT4_HTREE_LEVEL_COMPAT 2
2368 #define EXT4_HTREE_LEVEL        3
2369
2370 static inline int ext4_dir_htree_level(struct super_block *sb)
2371 {
2372         return ext4_has_feature_largedir(sb) ?
2373                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2374 }
2375
2376 /*
2377  * Timeout and state flag for lazy initialization inode thread.
2378  */
2379 #define EXT4_DEF_LI_WAIT_MULT                   10
2380 #define EXT4_DEF_LI_MAX_START_DELAY             5
2381 #define EXT4_LAZYINIT_QUIT                      0x0001
2382 #define EXT4_LAZYINIT_RUNNING                   0x0002
2383
2384 /*
2385  * Lazy inode table initialization info
2386  */
2387 struct ext4_lazy_init {
2388         unsigned long           li_state;
2389         struct list_head        li_request_list;
2390         struct mutex            li_list_mtx;
2391 };
2392
2393 enum ext4_li_mode {
2394         EXT4_LI_MODE_PREFETCH_BBITMAP,
2395         EXT4_LI_MODE_ITABLE,
2396 };
2397
2398 struct ext4_li_request {
2399         struct super_block      *lr_super;
2400         enum ext4_li_mode       lr_mode;
2401         ext4_group_t            lr_first_not_zeroed;
2402         ext4_group_t            lr_next_group;
2403         struct list_head        lr_request;
2404         unsigned long           lr_next_sched;
2405         unsigned long           lr_timeout;
2406 };
2407
2408 struct ext4_features {
2409         struct kobject f_kobj;
2410         struct completion f_kobj_unregister;
2411 };
2412
2413 /*
2414  * This structure will be used for multiple mount protection. It will be
2415  * written into the block number saved in the s_mmp_block field in the
2416  * superblock. Programs that check MMP should assume that if
2417  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2418  * to use the filesystem, regardless of how old the timestamp is.
2419  */
2420 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2421 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2422 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2423 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2424
2425 struct mmp_struct {
2426         __le32  mmp_magic;              /* Magic number for MMP */
2427         __le32  mmp_seq;                /* Sequence no. updated periodically */
2428
2429         /*
2430          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2431          * purposes and do not affect the correctness of the algorithm
2432          */
2433         __le64  mmp_time;               /* Time last updated */
2434         char    mmp_nodename[64];       /* Node which last updated MMP block */
2435         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2436
2437         /*
2438          * mmp_check_interval is used to verify if the MMP block has been
2439          * updated on the block device. The value is updated based on the
2440          * maximum time to write the MMP block during an update cycle.
2441          */
2442         __le16  mmp_check_interval;
2443
2444         __le16  mmp_pad1;
2445         __le32  mmp_pad2[226];
2446         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2447 };
2448
2449 /* arguments passed to the mmp thread */
2450 struct mmpd_data {
2451         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2452         struct super_block *sb;  /* super block of the fs */
2453 };
2454
2455 /*
2456  * Check interval multiplier
2457  * The MMP block is written every update interval and initially checked every
2458  * update interval x the multiplier (the value is then adapted based on the
2459  * write latency). The reason is that writes can be delayed under load and we
2460  * don't want readers to incorrectly assume that the filesystem is no longer
2461  * in use.
2462  */
2463 #define EXT4_MMP_CHECK_MULT             2UL
2464
2465 /*
2466  * Minimum interval for MMP checking in seconds.
2467  */
2468 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2469
2470 /*
2471  * Maximum interval for MMP checking in seconds.
2472  */
2473 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2474
2475 /*
2476  * Function prototypes
2477  */
2478
2479 /*
2480  * Ok, these declarations are also in <linux/kernel.h> but none of the
2481  * ext4 source programs needs to include it so they are duplicated here.
2482  */
2483 # define NORET_TYPE     /**/
2484 # define ATTRIB_NORET   __attribute__((noreturn))
2485 # define NORET_AND      noreturn,
2486
2487 /* bitmap.c */
2488 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2489 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2490                                 struct ext4_group_desc *gdp,
2491                                 struct buffer_head *bh, int sz);
2492 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2493                                   struct ext4_group_desc *gdp,
2494                                   struct buffer_head *bh, int sz);
2495 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2496                                 struct ext4_group_desc *gdp,
2497                                 struct buffer_head *bh);
2498 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2499                                   struct ext4_group_desc *gdp,
2500                                   struct buffer_head *bh);
2501
2502 /* balloc.c */
2503 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2504                                          ext4_fsblk_t blocknr,
2505                                          ext4_group_t *blockgrpp,
2506                                          ext4_grpblk_t *offsetp);
2507 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2508                                           ext4_fsblk_t block);
2509
2510 extern unsigned int ext4_block_group(struct super_block *sb,
2511                         ext4_fsblk_t blocknr);
2512 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2513                         ext4_fsblk_t blocknr);
2514 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2515 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2516                         ext4_group_t group);
2517 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2518                                          ext4_fsblk_t goal,
2519                                          unsigned int flags,
2520                                          unsigned long *count,
2521                                          int *errp);
2522 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2523                                     s64 nclusters, unsigned int flags);
2524 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2525 extern void ext4_check_blocks_bitmap(struct super_block *);
2526 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2527                                                     ext4_group_t block_group,
2528                                                     struct buffer_head ** bh);
2529 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2530
2531 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2532                                                 ext4_group_t block_group,
2533                                                 bool ignore_locked);
2534 extern int ext4_wait_block_bitmap(struct super_block *sb,
2535                                   ext4_group_t block_group,
2536                                   struct buffer_head *bh);
2537 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2538                                                   ext4_group_t block_group);
2539 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2540                                               ext4_group_t block_group,
2541                                               struct ext4_group_desc *gdp);
2542 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2543
2544 #ifdef CONFIG_UNICODE
2545 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2546                                          const struct qstr *iname,
2547                                          struct fscrypt_str *fname);
2548 #endif
2549
2550 #ifdef CONFIG_FS_ENCRYPTION
2551 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2552                                                 const struct fscrypt_name *src)
2553 {
2554         memset(dst, 0, sizeof(*dst));
2555
2556         dst->usr_fname = src->usr_fname;
2557         dst->disk_name = src->disk_name;
2558         dst->hinfo.hash = src->hash;
2559         dst->hinfo.minor_hash = src->minor_hash;
2560         dst->crypto_buf = src->crypto_buf;
2561 }
2562
2563 static inline int ext4_fname_setup_filename(struct inode *dir,
2564                                             const struct qstr *iname,
2565                                             int lookup,
2566                                             struct ext4_filename *fname)
2567 {
2568         struct fscrypt_name name;
2569         int err;
2570
2571         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2572         if (err)
2573                 return err;
2574
2575         ext4_fname_from_fscrypt_name(fname, &name);
2576
2577 #ifdef CONFIG_UNICODE
2578         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2579 #endif
2580         return 0;
2581 }
2582
2583 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2584                                             struct dentry *dentry,
2585                                             struct ext4_filename *fname)
2586 {
2587         struct fscrypt_name name;
2588         int err;
2589
2590         err = fscrypt_prepare_lookup(dir, dentry, &name);
2591         if (err)
2592                 return err;
2593
2594         ext4_fname_from_fscrypt_name(fname, &name);
2595
2596 #ifdef CONFIG_UNICODE
2597         ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2598 #endif
2599         return 0;
2600 }
2601
2602 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2603 {
2604         struct fscrypt_name name;
2605
2606         name.crypto_buf = fname->crypto_buf;
2607         fscrypt_free_filename(&name);
2608
2609         fname->crypto_buf.name = NULL;
2610         fname->usr_fname = NULL;
2611         fname->disk_name.name = NULL;
2612
2613 #ifdef CONFIG_UNICODE
2614         kfree(fname->cf_name.name);
2615         fname->cf_name.name = NULL;
2616 #endif
2617 }
2618 #else /* !CONFIG_FS_ENCRYPTION */
2619 static inline int ext4_fname_setup_filename(struct inode *dir,
2620                                             const struct qstr *iname,
2621                                             int lookup,
2622                                             struct ext4_filename *fname)
2623 {
2624         fname->usr_fname = iname;
2625         fname->disk_name.name = (unsigned char *) iname->name;
2626         fname->disk_name.len = iname->len;
2627
2628 #ifdef CONFIG_UNICODE
2629         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2630 #endif
2631
2632         return 0;
2633 }
2634
2635 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2636                                             struct dentry *dentry,
2637                                             struct ext4_filename *fname)
2638 {
2639         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2640 }
2641
2642 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2643 {
2644 #ifdef CONFIG_UNICODE
2645         kfree(fname->cf_name.name);
2646         fname->cf_name.name = NULL;
2647 #endif
2648 }
2649 #endif /* !CONFIG_FS_ENCRYPTION */
2650
2651 /* dir.c */
2652 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2653                                   struct file *,
2654                                   struct ext4_dir_entry_2 *,
2655                                   struct buffer_head *, char *, int,
2656                                   unsigned int);
2657 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2658         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2659                                         (de), (bh), (buf), (size), (offset)))
2660 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2661                                 __u32 minor_hash,
2662                                 struct ext4_dir_entry_2 *dirent,
2663                                 struct fscrypt_str *ent_name);
2664 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2665 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2666                              struct buffer_head *bh,
2667                              void *buf, int buf_size,
2668                              struct ext4_filename *fname,
2669                              struct ext4_dir_entry_2 **dest_de);
2670 void ext4_insert_dentry(struct inode *inode,
2671                         struct ext4_dir_entry_2 *de,
2672                         int buf_size,
2673                         struct ext4_filename *fname);
2674 static inline void ext4_update_dx_flag(struct inode *inode)
2675 {
2676         if (!ext4_has_feature_dir_index(inode->i_sb)) {
2677                 /* ext4_iget() should have caught this... */
2678                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2679                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2680         }
2681 }
2682 static const unsigned char ext4_filetype_table[] = {
2683         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2684 };
2685
2686 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2687 {
2688         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2689                 return DT_UNKNOWN;
2690
2691         return ext4_filetype_table[filetype];
2692 }
2693 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2694                              void *buf, int buf_size);
2695
2696 /* fsync.c */
2697 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2698
2699 /* hash.c */
2700 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2701                           struct dx_hash_info *hinfo);
2702
2703 /* ialloc.c */
2704 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2705 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2706                                       const struct qstr *qstr, __u32 goal,
2707                                       uid_t *owner, __u32 i_flags,
2708                                       int handle_type, unsigned int line_no,
2709                                       int nblocks);
2710
2711 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2712         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2713                          i_flags, 0, 0, 0)
2714 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2715                                     type, nblocks)                  \
2716         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2717                          0, (type), __LINE__, (nblocks))
2718
2719
2720 extern void ext4_free_inode(handle_t *, struct inode *);
2721 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2722 extern unsigned long ext4_count_free_inodes(struct super_block *);
2723 extern unsigned long ext4_count_dirs(struct super_block *);
2724 extern void ext4_check_inodes_bitmap(struct super_block *);
2725 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2726 extern int ext4_init_inode_table(struct super_block *sb,
2727                                  ext4_group_t group, int barrier);
2728 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2729
2730 /* fast_commit.c */
2731 int ext4_fc_info_show(struct seq_file *seq, void *v);
2732 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2733 void ext4_fc_init_inode(struct inode *inode);
2734 void ext4_fc_track_range(struct inode *inode, ext4_lblk_t start,
2735                          ext4_lblk_t end);
2736 void ext4_fc_track_unlink(struct inode *inode, struct dentry *dentry);
2737 void ext4_fc_track_link(struct inode *inode, struct dentry *dentry);
2738 void ext4_fc_track_create(struct inode *inode, struct dentry *dentry);
2739 void ext4_fc_track_inode(struct inode *inode);
2740 void ext4_fc_mark_ineligible(struct super_block *sb, int reason);
2741 void ext4_fc_start_ineligible(struct super_block *sb, int reason);
2742 void ext4_fc_stop_ineligible(struct super_block *sb);
2743 void ext4_fc_start_update(struct inode *inode);
2744 void ext4_fc_stop_update(struct inode *inode);
2745 void ext4_fc_del(struct inode *inode);
2746 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2747 void ext4_fc_replay_cleanup(struct super_block *sb);
2748 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2749 int __init ext4_fc_init_dentry_cache(void);
2750
2751 /* mballoc.c */
2752 extern const struct seq_operations ext4_mb_seq_groups_ops;
2753 extern long ext4_mb_stats;
2754 extern long ext4_mb_max_to_scan;
2755 extern int ext4_mb_init(struct super_block *);
2756 extern int ext4_mb_release(struct super_block *);
2757 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2758                                 struct ext4_allocation_request *, int *);
2759 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2760 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2761 extern int __init ext4_init_mballoc(void);
2762 extern void ext4_exit_mballoc(void);
2763 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2764                                      ext4_group_t group,
2765                                      unsigned int nr, int *cnt);
2766 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2767                                   unsigned int nr);
2768
2769 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2770                              struct buffer_head *bh, ext4_fsblk_t block,
2771                              unsigned long count, int flags);
2772 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2773                                    ext4_group_t ngroups);
2774 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2775                 ext4_group_t i, struct ext4_group_desc *desc);
2776 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2777                                 ext4_fsblk_t block, unsigned long count);
2778 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2779 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2780 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2781                        int len, int state);
2782
2783 /* inode.c */
2784 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2785                          struct ext4_inode_info *ei);
2786 int ext4_inode_is_fast_symlink(struct inode *inode);
2787 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2788 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2789 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2790                      bool wait, struct buffer_head **bhs);
2791 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2792                              struct buffer_head *bh_result, int create);
2793 int ext4_get_block(struct inode *inode, sector_t iblock,
2794                    struct buffer_head *bh_result, int create);
2795 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2796                            struct buffer_head *bh, int create);
2797 int ext4_walk_page_buffers(handle_t *handle,
2798                            struct buffer_head *head,
2799                            unsigned from,
2800                            unsigned to,
2801                            int *partial,
2802                            int (*fn)(handle_t *handle,
2803                                      struct buffer_head *bh));
2804 int do_journal_get_write_access(handle_t *handle,
2805                                 struct buffer_head *bh);
2806 #define FALL_BACK_TO_NONDELALLOC 1
2807 #define CONVERT_INLINE_DATA      2
2808
2809 typedef enum {
2810         EXT4_IGET_NORMAL =      0,
2811         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2812         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2813 } ext4_iget_flags;
2814
2815 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2816                                  ext4_iget_flags flags, const char *function,
2817                                  unsigned int line);
2818
2819 #define ext4_iget(sb, ino, flags) \
2820         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2821
2822 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2823 extern int  ext4_setattr(struct dentry *, struct iattr *);
2824 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2825 extern void ext4_evict_inode(struct inode *);
2826 extern void ext4_clear_inode(struct inode *);
2827 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2828 extern int  ext4_sync_inode(handle_t *, struct inode *);
2829 extern void ext4_dirty_inode(struct inode *, int);
2830 extern int ext4_change_inode_journal_flag(struct inode *, int);
2831 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2832 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2833                           struct ext4_iloc *iloc);
2834 extern int ext4_inode_attach_jinode(struct inode *inode);
2835 extern int ext4_can_truncate(struct inode *inode);
2836 extern int ext4_truncate(struct inode *);
2837 extern int ext4_break_layouts(struct inode *);
2838 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2839 extern void ext4_set_inode_flags(struct inode *, bool init);
2840 extern int ext4_alloc_da_blocks(struct inode *inode);
2841 extern void ext4_set_aops(struct inode *inode);
2842 extern int ext4_writepage_trans_blocks(struct inode *);
2843 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2844 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2845                              loff_t lstart, loff_t lend);
2846 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2847 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2848 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2849 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2850 extern void ext4_da_release_space(struct inode *inode, int to_free);
2851 extern void ext4_da_update_reserve_space(struct inode *inode,
2852                                         int used, int quota_claim);
2853 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2854                               ext4_fsblk_t pblk, ext4_lblk_t len);
2855
2856 /* indirect.c */
2857 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2858                                 struct ext4_map_blocks *map, int flags);
2859 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2860 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2861 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2862                                  ext4_lblk_t start, ext4_lblk_t end);
2863
2864 /* ioctl.c */
2865 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2866 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2867 extern void ext4_reset_inode_seed(struct inode *inode);
2868
2869 /* migrate.c */
2870 extern int ext4_ext_migrate(struct inode *);
2871 extern int ext4_ind_migrate(struct inode *inode);
2872
2873 /* namei.c */
2874 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
2875                              struct inode *inode);
2876 extern int ext4_dirblock_csum_verify(struct inode *inode,
2877                                      struct buffer_head *bh);
2878 extern int ext4_orphan_add(handle_t *, struct inode *);
2879 extern int ext4_orphan_del(handle_t *, struct inode *);
2880 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2881                                 __u32 start_minor_hash, __u32 *next_hash);
2882 extern int ext4_search_dir(struct buffer_head *bh,
2883                            char *search_buf,
2884                            int buf_size,
2885                            struct inode *dir,
2886                            struct ext4_filename *fname,
2887                            unsigned int offset,
2888                            struct ext4_dir_entry_2 **res_dir);
2889 extern int ext4_generic_delete_entry(struct inode *dir,
2890                                      struct ext4_dir_entry_2 *de_del,
2891                                      struct buffer_head *bh,
2892                                      void *entry_buf,
2893                                      int buf_size,
2894                                      int csum_size);
2895 extern bool ext4_empty_dir(struct inode *inode);
2896
2897 /* resize.c */
2898 extern void ext4_kvfree_array_rcu(void *to_free);
2899 extern int ext4_group_add(struct super_block *sb,
2900                                 struct ext4_new_group_data *input);
2901 extern int ext4_group_extend(struct super_block *sb,
2902                                 struct ext4_super_block *es,
2903                                 ext4_fsblk_t n_blocks_count);
2904 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2905
2906 /* super.c */
2907 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2908                                          sector_t block, int op_flags);
2909 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
2910                                                    sector_t block);
2911 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
2912                                 bh_end_io_t *end_io);
2913 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
2914                         bh_end_io_t *end_io);
2915 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
2916 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
2917 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2918 extern int ext4_calculate_overhead(struct super_block *sb);
2919 extern void ext4_superblock_csum_set(struct super_block *sb);
2920 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2921                                     ext4_group_t ngroup);
2922 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2923                                      char nbuf[16]);
2924 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2925                                              ext4_group_t block_group,
2926                                              unsigned int flags);
2927
2928 extern __printf(6, 7)
2929 void __ext4_error(struct super_block *, const char *, unsigned int, int, __u64,
2930                   const char *, ...);
2931 extern __printf(6, 7)
2932 void __ext4_error_inode(struct inode *, const char *, unsigned int,
2933                         ext4_fsblk_t, int, const char *, ...);
2934 extern __printf(5, 6)
2935 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2936                      const char *, ...);
2937 extern void __ext4_std_error(struct super_block *, const char *,
2938                              unsigned int, int);
2939 extern __printf(5, 6)
2940 void __ext4_abort(struct super_block *, const char *, unsigned int, int,
2941                   const char *, ...);
2942 extern __printf(4, 5)
2943 void __ext4_warning(struct super_block *, const char *, unsigned int,
2944                     const char *, ...);
2945 extern __printf(4, 5)
2946 void __ext4_warning_inode(const struct inode *inode, const char *function,
2947                           unsigned int line, const char *fmt, ...);
2948 extern __printf(3, 4)
2949 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2950 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2951                            const char *, unsigned int, const char *);
2952 extern __printf(7, 8)
2953 void __ext4_grp_locked_error(const char *, unsigned int,
2954                              struct super_block *, ext4_group_t,
2955                              unsigned long, ext4_fsblk_t,
2956                              const char *, ...);
2957
2958 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2959         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2960
2961 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)                     \
2962         __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
2963
2964 #define ext4_error_inode_block(inode, block, err, fmt, a...)            \
2965         __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
2966                            (fmt), ## a)
2967
2968 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2969         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2970
2971 #ifdef CONFIG_PRINTK
2972
2973 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2974         __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
2975 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
2976         __ext4_error_inode((inode), (func), (line), (block),            \
2977                            (err), (fmt), ##__VA_ARGS__)
2978 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2979         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2980 #define ext4_error(sb, fmt, ...)                                        \
2981         __ext4_error((sb), __func__, __LINE__, 0, 0, (fmt), ##__VA_ARGS__)
2982 #define ext4_error_err(sb, err, fmt, ...)                               \
2983         __ext4_error((sb), __func__, __LINE__, (err), 0, (fmt), ##__VA_ARGS__)
2984 #define ext4_abort(sb, err, fmt, ...)                                   \
2985         __ext4_abort((sb), __func__, __LINE__, (err), (fmt), ##__VA_ARGS__)
2986 #define ext4_warning(sb, fmt, ...)                                      \
2987         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2988 #define ext4_warning_inode(inode, fmt, ...)                             \
2989         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2990 #define ext4_msg(sb, level, fmt, ...)                           \
2991         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2992 #define dump_mmp_msg(sb, mmp, msg)                                      \
2993         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2994 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2995         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2996                                 fmt, ##__VA_ARGS__)
2997
2998 #else
2999
3000 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3001 do {                                                                    \
3002         no_printk(fmt, ##__VA_ARGS__);                                  \
3003         __ext4_error_inode(inode, "", 0, block, 0, " ");                \
3004 } while (0)
3005 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3006 do {                                                                    \
3007         no_printk(fmt, ##__VA_ARGS__);                                  \
3008         __ext4_error_inode(inode, "", 0, block, err, " ");              \
3009 } while (0)
3010 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3011 do {                                                                    \
3012         no_printk(fmt, ##__VA_ARGS__);                                  \
3013         __ext4_error_file(file, "", 0, block, " ");                     \
3014 } while (0)
3015 #define ext4_error(sb, fmt, ...)                                        \
3016 do {                                                                    \
3017         no_printk(fmt, ##__VA_ARGS__);                                  \
3018         __ext4_error(sb, "", 0, 0, 0, " ");                             \
3019 } while (0)
3020 #define ext4_error_err(sb, err, fmt, ...)                               \
3021 do {                                                                    \
3022         no_printk(fmt, ##__VA_ARGS__);                                  \
3023         __ext4_error(sb, "", 0, err, 0, " ");                           \
3024 } while (0)
3025 #define ext4_abort(sb, err, fmt, ...)                                   \
3026 do {                                                                    \
3027         no_printk(fmt, ##__VA_ARGS__);                                  \
3028         __ext4_abort(sb, "", 0, err, " ");                              \
3029 } while (0)
3030 #define ext4_warning(sb, fmt, ...)                                      \
3031 do {                                                                    \
3032         no_printk(fmt, ##__VA_ARGS__);                                  \
3033         __ext4_warning(sb, "", 0, " ");                                 \
3034 } while (0)
3035 #define ext4_warning_inode(inode, fmt, ...)                             \
3036 do {                                                                    \
3037         no_printk(fmt, ##__VA_ARGS__);                                  \
3038         __ext4_warning_inode(inode, "", 0, " ");                        \
3039 } while (0)
3040 #define ext4_msg(sb, level, fmt, ...)                                   \
3041 do {                                                                    \
3042         no_printk(fmt, ##__VA_ARGS__);                                  \
3043         __ext4_msg(sb, "", " ");                                        \
3044 } while (0)
3045 #define dump_mmp_msg(sb, mmp, msg)                                      \
3046         __dump_mmp_msg(sb, mmp, "", 0, "")
3047 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3048 do {                                                                    \
3049         no_printk(fmt, ##__VA_ARGS__);                          \
3050         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
3051 } while (0)
3052
3053 #endif
3054
3055 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3056                                       struct ext4_group_desc *bg);
3057 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3058                                       struct ext4_group_desc *bg);
3059 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3060                                      struct ext4_group_desc *bg);
3061 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3062                                       struct ext4_group_desc *bg);
3063 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3064                                  struct ext4_group_desc *bg);
3065 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3066                                 struct ext4_group_desc *bg);
3067 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3068                                    struct ext4_group_desc *bg);
3069 extern void ext4_block_bitmap_set(struct super_block *sb,
3070                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3071 extern void ext4_inode_bitmap_set(struct super_block *sb,
3072                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3073 extern void ext4_inode_table_set(struct super_block *sb,
3074                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3075 extern void ext4_free_group_clusters_set(struct super_block *sb,
3076                                          struct ext4_group_desc *bg,
3077                                          __u32 count);
3078 extern void ext4_free_inodes_set(struct super_block *sb,
3079                                 struct ext4_group_desc *bg, __u32 count);
3080 extern void ext4_used_dirs_set(struct super_block *sb,
3081                                 struct ext4_group_desc *bg, __u32 count);
3082 extern void ext4_itable_unused_set(struct super_block *sb,
3083                                    struct ext4_group_desc *bg, __u32 count);
3084 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3085                                        struct ext4_group_desc *gdp);
3086 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3087                                      struct ext4_group_desc *gdp);
3088 extern int ext4_register_li_request(struct super_block *sb,
3089                                     ext4_group_t first_not_zeroed);
3090
3091 static inline int ext4_has_metadata_csum(struct super_block *sb)
3092 {
3093         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3094                      !EXT4_SB(sb)->s_chksum_driver);
3095
3096         return ext4_has_feature_metadata_csum(sb) &&
3097                (EXT4_SB(sb)->s_chksum_driver != NULL);
3098 }
3099
3100 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3101 {
3102         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3103 }
3104
3105 #define ext4_read_incompat_64bit_val(es, name) \
3106         (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3107                 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3108                 le32_to_cpu(es->name##_lo))
3109
3110 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3111 {
3112         return ext4_read_incompat_64bit_val(es, s_blocks_count);
3113 }
3114
3115 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3116 {
3117         return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3118 }
3119
3120 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3121 {
3122         return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3123 }
3124
3125 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3126                                          ext4_fsblk_t blk)
3127 {
3128         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3129         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3130 }
3131
3132 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3133                                               ext4_fsblk_t blk)
3134 {
3135         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3136         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3137 }
3138
3139 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3140                                            ext4_fsblk_t blk)
3141 {
3142         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3143         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3144 }
3145
3146 static inline loff_t ext4_isize(struct super_block *sb,
3147                                 struct ext4_inode *raw_inode)
3148 {
3149         if (ext4_has_feature_largedir(sb) ||
3150             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3151                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3152                         le32_to_cpu(raw_inode->i_size_lo);
3153
3154         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3155 }
3156
3157 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3158 {
3159         raw_inode->i_size_lo = cpu_to_le32(i_size);
3160         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3161 }
3162
3163 static inline
3164 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3165                                             ext4_group_t group)
3166 {
3167          struct ext4_group_info **grp_info;
3168          long indexv, indexh;
3169          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3170          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3171          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3172          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3173          return grp_info[indexh];
3174 }
3175
3176 /*
3177  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3178  * the locking protocol documented in the comments of ext4_group_add()
3179  * in resize.c
3180  */
3181 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3182 {
3183         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
3184
3185         smp_rmb();
3186         return ngroups;
3187 }
3188
3189 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3190                                              ext4_group_t block_group)
3191 {
3192         return block_group >> sbi->s_log_groups_per_flex;
3193 }
3194
3195 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3196 {
3197         return 1 << sbi->s_log_groups_per_flex;
3198 }
3199
3200 #define ext4_std_error(sb, errno)                               \
3201 do {                                                            \
3202         if ((errno))                                            \
3203                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
3204 } while (0)
3205
3206 #ifdef CONFIG_SMP
3207 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3208  * counters. So we need to make sure we have free clusters more
3209  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3210  */
3211 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3212 #else
3213 #define EXT4_FREECLUSTERS_WATERMARK 0
3214 #endif
3215
3216 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
3217 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3218 {
3219         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3220                      !inode_is_locked(inode));
3221         down_write(&EXT4_I(inode)->i_data_sem);
3222         if (newsize > EXT4_I(inode)->i_disksize)
3223                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3224         up_write(&EXT4_I(inode)->i_data_sem);
3225 }
3226
3227 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
3228 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3229 {
3230         int changed = 0;
3231
3232         if (newsize > inode->i_size) {
3233                 i_size_write(inode, newsize);
3234                 changed = 1;
3235         }
3236         if (newsize > EXT4_I(inode)->i_disksize) {
3237                 ext4_update_i_disksize(inode, newsize);
3238                 changed |= 2;
3239         }
3240         return changed;
3241 }
3242
3243 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3244                                       loff_t len);
3245
3246 struct ext4_group_info {
3247         unsigned long   bb_state;
3248 #ifdef AGGRESSIVE_CHECK
3249         unsigned long   bb_check_counter;
3250 #endif
3251         struct rb_root  bb_free_root;
3252         ext4_grpblk_t   bb_first_free;  /* first free block */
3253         ext4_grpblk_t   bb_free;        /* total free blocks */
3254         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
3255         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
3256         struct          list_head bb_prealloc_list;
3257 #ifdef DOUBLE_CHECK
3258         void            *bb_bitmap;
3259 #endif
3260         struct rw_semaphore alloc_sem;
3261         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3262                                          * regions, index is order.
3263                                          * bb_counters[3] = 5 means
3264                                          * 5 free 8-block regions. */
3265 };
3266
3267 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3268 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3269 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3270 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3271 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3272         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3273 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3274         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3275 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT        4
3276
3277 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3278         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3279 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3280         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3281 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3282         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3283
3284 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3285         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3286 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3287         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3288 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3289         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3290 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)      \
3291         (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3292
3293 #define EXT4_MAX_CONTENTION             8
3294 #define EXT4_CONTENTION_THRESHOLD       2
3295
3296 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3297                                               ext4_group_t group)
3298 {
3299         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3300 }
3301
3302 /*
3303  * Returns true if the filesystem is busy enough that attempts to
3304  * access the block group locks has run into contention.
3305  */
3306 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3307 {
3308         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3309 }
3310
3311 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3312 {
3313         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3314         if (spin_trylock(lock))
3315                 /*
3316                  * We're able to grab the lock right away, so drop the
3317                  * lock contention counter.
3318                  */
3319                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3320         else {
3321                 /*
3322                  * The lock is busy, so bump the contention counter,
3323                  * and then wait on the spin lock.
3324                  */
3325                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3326                                   EXT4_MAX_CONTENTION);
3327                 spin_lock(lock);
3328         }
3329 }
3330
3331 static inline void ext4_unlock_group(struct super_block *sb,
3332                                         ext4_group_t group)
3333 {
3334         spin_unlock(ext4_group_lock_ptr(sb, group));
3335 }
3336
3337 /*
3338  * Block validity checking
3339  */
3340 #define ext4_check_indirect_blockref(inode, bh)                         \
3341         ext4_check_blockref(__func__, __LINE__, inode,                  \
3342                             (__le32 *)(bh)->b_data,                     \
3343                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3344
3345 #define ext4_ind_check_inode(inode)                                     \
3346         ext4_check_blockref(__func__, __LINE__, inode,                  \
3347                             EXT4_I(inode)->i_data,                      \
3348                             EXT4_NDIR_BLOCKS)
3349
3350 /*
3351  * Inodes and files operations
3352  */
3353
3354 /* dir.c */
3355 extern const struct file_operations ext4_dir_operations;
3356
3357 #ifdef CONFIG_UNICODE
3358 extern const struct dentry_operations ext4_dentry_ops;
3359 #endif
3360
3361 /* file.c */
3362 extern const struct inode_operations ext4_file_inode_operations;
3363 extern const struct file_operations ext4_file_operations;
3364 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3365
3366 /* inline.c */
3367 extern int ext4_get_max_inline_size(struct inode *inode);
3368 extern int ext4_find_inline_data_nolock(struct inode *inode);
3369 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3370                                  unsigned int len);
3371 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3372
3373 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3374 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3375                                          struct inode *inode,
3376                                          loff_t pos, unsigned len,
3377                                          unsigned flags,
3378                                          struct page **pagep);
3379 extern int ext4_write_inline_data_end(struct inode *inode,
3380                                       loff_t pos, unsigned len,
3381                                       unsigned copied,
3382                                       struct page *page);
3383 extern struct buffer_head *
3384 ext4_journalled_write_inline_data(struct inode *inode,
3385                                   unsigned len,
3386                                   struct page *page);
3387 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3388                                            struct inode *inode,
3389                                            loff_t pos, unsigned len,
3390                                            unsigned flags,
3391                                            struct page **pagep,
3392                                            void **fsdata);
3393 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3394                                          unsigned len, unsigned copied,
3395                                          struct page *page);
3396 extern int ext4_try_add_inline_entry(handle_t *handle,
3397                                      struct ext4_filename *fname,
3398                                      struct inode *dir, struct inode *inode);
3399 extern int ext4_try_create_inline_dir(handle_t *handle,
3400                                       struct inode *parent,
3401                                       struct inode *inode);
3402 extern int ext4_read_inline_dir(struct file *filp,
3403                                 struct dir_context *ctx,
3404                                 int *has_inline_data);
3405 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3406                                   struct inode *dir, ext4_lblk_t block,
3407                                   struct dx_hash_info *hinfo,
3408                                   __u32 start_hash, __u32 start_minor_hash,
3409                                   int *has_inline_data);
3410 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3411                                         struct ext4_filename *fname,
3412                                         struct ext4_dir_entry_2 **res_dir,
3413                                         int *has_inline_data);
3414 extern int ext4_delete_inline_entry(handle_t *handle,
3415                                     struct inode *dir,
3416                                     struct ext4_dir_entry_2 *de_del,
3417                                     struct buffer_head *bh,
3418                                     int *has_inline_data);
3419 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3420 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3421                                         struct ext4_dir_entry_2 **parent_de,
3422                                         int *retval);
3423 extern int ext4_inline_data_fiemap(struct inode *inode,
3424                                    struct fiemap_extent_info *fieinfo,
3425                                    int *has_inline, __u64 start, __u64 len);
3426
3427 struct iomap;
3428 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3429
3430 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3431
3432 extern int ext4_convert_inline_data(struct inode *inode);
3433
3434 static inline int ext4_has_inline_data(struct inode *inode)
3435 {
3436         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3437                EXT4_I(inode)->i_inline_off;
3438 }
3439
3440 /* namei.c */
3441 extern const struct inode_operations ext4_dir_inode_operations;
3442 extern const struct inode_operations ext4_special_inode_operations;
3443 extern struct dentry *ext4_get_parent(struct dentry *child);
3444 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3445                                  struct ext4_dir_entry_2 *de,
3446                                  int blocksize, int csum_size,
3447                                  unsigned int parent_ino, int dotdot_real_len);
3448 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3449                                         unsigned int blocksize);
3450 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3451                                       struct buffer_head *bh);
3452 extern int ext4_ci_compare(const struct inode *parent,
3453                            const struct qstr *fname,
3454                            const struct qstr *entry, bool quick);
3455 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3456                          struct inode *inode);
3457 extern int __ext4_link(struct inode *dir, struct inode *inode,
3458                        struct dentry *dentry);
3459
3460 #define S_SHIFT 12
3461 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3462         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3463         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3464         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3465         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3466         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3467         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3468         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3469 };
3470
3471 static inline void ext4_set_de_type(struct super_block *sb,
3472                                 struct ext4_dir_entry_2 *de,
3473                                 umode_t mode) {
3474         if (ext4_has_feature_filetype(sb))
3475                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3476 }
3477
3478 /* readpages.c */
3479 extern int ext4_mpage_readpages(struct inode *inode,
3480                 struct readahead_control *rac, struct page *page);
3481 extern int __init ext4_init_post_read_processing(void);
3482 extern void ext4_exit_post_read_processing(void);
3483
3484 /* symlink.c */
3485 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3486 extern const struct inode_operations ext4_symlink_inode_operations;
3487 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3488
3489 /* sysfs.c */
3490 extern int ext4_register_sysfs(struct super_block *sb);
3491 extern void ext4_unregister_sysfs(struct super_block *sb);
3492 extern int __init ext4_init_sysfs(void);
3493 extern void ext4_exit_sysfs(void);
3494
3495 /* block_validity */
3496 extern void ext4_release_system_zone(struct super_block *sb);
3497 extern int ext4_setup_system_zone(struct super_block *sb);
3498 extern int __init ext4_init_system_zone(void);
3499 extern void ext4_exit_system_zone(void);
3500 extern int ext4_inode_block_valid(struct inode *inode,
3501                                   ext4_fsblk_t start_blk,
3502                                   unsigned int count);
3503 extern int ext4_check_blockref(const char *, unsigned int,
3504                                struct inode *, __le32 *, unsigned int);
3505
3506 /* extents.c */
3507 struct ext4_ext_path;
3508 struct ext4_extent;
3509
3510 /*
3511  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3512  * __le32.
3513  */
3514 #define EXT_MAX_BLOCKS  0xffffffff
3515
3516 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3517 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3518 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3519                                struct ext4_map_blocks *map, int flags);
3520 extern int ext4_ext_truncate(handle_t *, struct inode *);
3521 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3522                                  ext4_lblk_t end);
3523 extern void ext4_ext_init(struct super_block *);
3524 extern void ext4_ext_release(struct super_block *);
3525 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3526                           loff_t len);
3527 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3528                                           loff_t offset, ssize_t len);
3529 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3530                                              ext4_io_end_t *io_end);
3531 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3532                            struct ext4_map_blocks *map, int flags);
3533 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3534                                                    int num,
3535                                                    struct ext4_ext_path *path);
3536 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3537                                   struct ext4_ext_path **,
3538                                   struct ext4_extent *, int);
3539 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3540                                               struct ext4_ext_path **,
3541                                               int flags);
3542 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3543 extern int ext4_ext_check_inode(struct inode *inode);
3544 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3545 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3546                         __u64 start, __u64 len);
3547 extern int ext4_get_es_cache(struct inode *inode,
3548                              struct fiemap_extent_info *fieinfo,
3549                              __u64 start, __u64 len);
3550 extern int ext4_ext_precache(struct inode *inode);
3551 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3552                                 struct inode *inode2, ext4_lblk_t lblk1,
3553                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3554                              int mark_unwritten,int *err);
3555 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3556 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3557                                        int check_cred, int restart_cred,
3558                                        int revoke_cred);
3559 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3560 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3561 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3562                 int len, int unwritten, ext4_fsblk_t pblk);
3563 extern int ext4_ext_clear_bb(struct inode *inode);
3564
3565
3566 /* move_extent.c */
3567 extern void ext4_double_down_write_data_sem(struct inode *first,
3568                                             struct inode *second);
3569 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3570                                           struct inode *donor_inode);
3571 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3572                              __u64 start_orig, __u64 start_donor,
3573                              __u64 len, __u64 *moved_len);
3574
3575 /* page-io.c */
3576 extern int __init ext4_init_pageio(void);
3577 extern void ext4_exit_pageio(void);
3578 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3579 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3580 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3581 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3582 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3583                                 struct writeback_control *wbc);
3584 extern void ext4_end_io_rsv_work(struct work_struct *work);
3585 extern void ext4_io_submit(struct ext4_io_submit *io);
3586 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3587                                struct page *page,
3588                                int len,
3589                                struct writeback_control *wbc,
3590                                bool keep_towrite);
3591 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3592 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3593
3594 /* mmp.c */
3595 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3596
3597 /* verity.c */
3598 extern const struct fsverity_operations ext4_verityops;
3599
3600 /*
3601  * Add new method to test whether block and inode bitmaps are properly
3602  * initialized. With uninit_bg reading the block from disk is not enough
3603  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3604  */
3605 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3606
3607 static inline int bitmap_uptodate(struct buffer_head *bh)
3608 {
3609         return (buffer_uptodate(bh) &&
3610                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3611 }
3612 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3613 {
3614         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3615 }
3616
3617 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3618
3619 /* For ioend & aio unwritten conversion wait queues */
3620 #define EXT4_WQ_HASH_SZ         37
3621 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3622                                             EXT4_WQ_HASH_SZ])
3623 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3624
3625 extern int ext4_resize_begin(struct super_block *sb);
3626 extern void ext4_resize_end(struct super_block *sb);
3627
3628 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3629                                               struct ext4_io_end *io_end)
3630 {
3631         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3632                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3633                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3634         }
3635 }
3636
3637 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3638 {
3639         struct inode *inode = io_end->inode;
3640
3641         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3642                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3643                 /* Wake up anyone waiting on unwritten extent conversion */
3644                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3645                         wake_up_all(ext4_ioend_wq(inode));
3646         }
3647 }
3648
3649 extern const struct iomap_ops ext4_iomap_ops;
3650 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3651 extern const struct iomap_ops ext4_iomap_report_ops;
3652
3653 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3654 {
3655         /*
3656          * If the buffer has the write error flag, we have failed
3657          * to write out data in the block.  In this  case, we don't
3658          * have to read the block because we may read the old data
3659          * successfully.
3660          */
3661         if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3662                 set_buffer_uptodate(bh);
3663         return buffer_uptodate(bh);
3664 }
3665
3666 #endif  /* __KERNEL__ */
3667
3668 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3669 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3670
3671 #endif  /* _EXT4_H */