fs/ext4/ext4.h

   1 /*
   2  *  ext4.h
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/include/linux/minix_fs.h
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _EXT4_H
  17 #define _EXT4_H
  18
  19 #include <linux/types.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/magic.h>
  22 #include <linux/jbd2.h>
  23 #include <linux/quota.h>
  24 #include <linux/rwsem.h>
  25 #include <linux/rbtree.h>
  26 #include <linux/seqlock.h>
  27 #include <linux/mutex.h>
  28 #include <linux/timer.h>
  29 #include <linux/version.h>
  30 #include <linux/wait.h>
  31 #include <linux/blockgroup_lock.h>
  32 #include <linux/percpu_counter.h>
  33 #include <linux/ratelimit.h>
  34 #include <crypto/hash.h>
  35 #include <linux/fscrypto.h>
  36 #include <linux/falloc.h>
  37 #include <linux/percpu-rwsem.h>
  38 #ifdef __KERNEL__
  39 #include <linux/compat.h>
  40 #endif
  41
  42 /*
  43  * The fourth extended filesystem constants/structures
  44  */
  45
  46 /*
  47  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  48  * structures. these checks slow things down a lot
  49  */
  50 #define AGGRESSIVE_CHECK__
  51
  52 /*
  53  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  54  * bitmaps, maintains and uses them to check for double allocations
  55  */
  56 #define DOUBLE_CHECK__
  57
  58 /*
  59  * Define EXT4FS_DEBUG to produce debug messages
  60  */
  61 #undef EXT4FS_DEBUG
  62
  63 /*
  64  * Debug code
  65  */
  66 #ifdef EXT4FS_DEBUG
  67 #define ext4_debug(f, a...)                                             \
  68         do {                                                            \
  69                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  70                         __FILE__, __LINE__, __func__);                  \
  71                 printk(KERN_DEBUG f, ## a);                             \
  72         } while (0)
  73 #else
  74 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  75 #endif
  76
  77 /*
  78  * Turn on EXT_DEBUG to get lots of info about extents operations.
  79  */
  80 #define EXT_DEBUG__
  81 #ifdef EXT_DEBUG
  82 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  83 #else
  84 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
  85 #endif
  86
  87 /* data type for block offset of block group */
  88 typedef int ext4_grpblk_t;
  89
  90 /* data type for filesystem-wide blocks number */
  91 typedef unsigned long long ext4_fsblk_t;
  92
  93 /* data type for file logical block number */
  94 typedef __u32 ext4_lblk_t;
  95
  96 /* data type for block group number */
  97 typedef unsigned int ext4_group_t;
  98
  99 enum SHIFT_DIRECTION {
 100         SHIFT_LEFT = 0,
 101         SHIFT_RIGHT,
 102 };
 103
 104 /*
 105  * Flags used in mballoc's allocation_context flags field.
 106  *
 107  * Also used to show what's going on for debugging purposes when the
 108  * flag field is exported via the traceport interface
 109  */
 110
 111 /* prefer goal again. length */
 112 #define EXT4_MB_HINT_MERGE              0x0001
 113 /* blocks already reserved */
 114 #define EXT4_MB_HINT_RESERVED           0x0002
 115 /* metadata is being allocated */
 116 #define EXT4_MB_HINT_METADATA           0x0004
 117 /* first blocks in the file */
 118 #define EXT4_MB_HINT_FIRST              0x0008
 119 /* search for the best chunk */
 120 #define EXT4_MB_HINT_BEST               0x0010
 121 /* data is being allocated */
 122 #define EXT4_MB_HINT_DATA               0x0020
 123 /* don't preallocate (for tails) */
 124 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 125 /* allocate for locality group */
 126 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 127 /* allocate goal blocks or none */
 128 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 129 /* goal is meaningful */
 130 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 131 /* blocks already pre-reserved by delayed allocation */
 132 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 133 /* We are doing stream allocation */
 134 #define EXT4_MB_STREAM_ALLOC            0x0800
 135 /* Use reserved root blocks if needed */
 136 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 137 /* Use blocks from reserved pool */
 138 #define EXT4_MB_USE_RESERVED            0x2000
 139
 140 struct ext4_allocation_request {
 141         /* target inode for block we're allocating */
 142         struct inode *inode;
 143         /* how many blocks we want to allocate */
 144         unsigned int len;
 145         /* logical block in target inode */
 146         ext4_lblk_t logical;
 147         /* the closest logical allocated block to the left */
 148         ext4_lblk_t lleft;
 149         /* the closest logical allocated block to the right */
 150         ext4_lblk_t lright;
 151         /* phys. target (a hint) */
 152         ext4_fsblk_t goal;
 153         /* phys. block for the closest logical allocated block to the left */
 154         ext4_fsblk_t pleft;
 155         /* phys. block for the closest logical allocated block to the right */
 156         ext4_fsblk_t pright;
 157         /* flags. see above EXT4_MB_HINT_* */
 158         unsigned int flags;
 159 };
 160
 161 /*
 162  * Logical to physical block mapping, used by ext4_map_blocks()
 163  *
 164  * This structure is used to pass requests into ext4_map_blocks() as
 165  * well as to store the information returned by ext4_map_blocks().  It
 166  * takes less room on the stack than a struct buffer_head.
 167  */
 168 #define EXT4_MAP_NEW            (1 << BH_New)
 169 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 170 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 171 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 172 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 173                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 174
 175 struct ext4_map_blocks {
 176         ext4_fsblk_t m_pblk;
 177         ext4_lblk_t m_lblk;
 178         unsigned int m_len;
 179         unsigned int m_flags;
 180 };
 181
 182 /*
 183  * Flags for ext4_io_end->flags
 184  */
 185 #define EXT4_IO_END_UNWRITTEN   0x0001
 186
 187 /*
 188  * For converting unwritten extents on a work queue. 'handle' is used for
 189  * buffered writeback.
 190  */
 191 typedef struct ext4_io_end {
 192         struct list_head        list;           /* per-file finished IO list */
 193         handle_t                *handle;        /* handle reserved for extent
 194                                                  * conversion */
 195         struct inode            *inode;         /* file being written to */
 196         struct bio              *bio;           /* Linked list of completed
 197                                                  * bios covering the extent */
 198         unsigned int            flag;           /* unwritten or not */
 199         atomic_t                count;          /* reference counter */
 200         loff_t                  offset;         /* offset in the file */
 201         ssize_t                 size;           /* size of the extent */
 202 } ext4_io_end_t;
 203
 204 struct ext4_io_submit {
 205         struct writeback_control *io_wbc;
 206         struct bio              *io_bio;
 207         ext4_io_end_t           *io_end;
 208         sector_t                io_next_block;
 209 };
 210
 211 /*
 212  * Special inodes numbers
 213  */
 214 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 215 #define EXT4_ROOT_INO            2      /* Root inode */
 216 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 217 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 218 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 219 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 220 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 221 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 222
 223 /* First non-reserved inode for old ext4 filesystems */
 224 #define EXT4_GOOD_OLD_FIRST_INO 11
 225
 226 /*
 227  * Maximal count of links to a file
 228  */
 229 #define EXT4_LINK_MAX           65000
 230
 231 /*
 232  * Macro-instructions used to manage several block sizes
 233  */
 234 #define EXT4_MIN_BLOCK_SIZE             1024
 235 #define EXT4_MAX_BLOCK_SIZE             65536
 236 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 237 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 238 #ifdef __KERNEL__
 239 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 240 #else
 241 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 242 #endif
 243 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 244 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 245                                          EXT4_SB(s)->s_cluster_bits)
 246 #ifdef __KERNEL__
 247 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 248 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 249 #else
 250 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 251 #endif
 252 #ifdef __KERNEL__
 253 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 254 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 255 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 256 #else
 257 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 258                                  EXT4_GOOD_OLD_INODE_SIZE : \
 259                                  (s)->s_inode_size)
 260 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 261                                  EXT4_GOOD_OLD_FIRST_INO : \
 262                                  (s)->s_first_ino)
 263 #endif
 264 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 265 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 266         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 267                                                                   blkbits))
 268
 269 /* Translate a block number to a cluster number */
 270 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 271 /* Translate a cluster number to a block number */
 272 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 273 /* Translate # of blks to # of clusters */
 274 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 275                                  (sbi)->s_cluster_bits)
 276 /* Mask out the low bits to get the starting block of the cluster */
 277 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 278                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 279 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 280                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 281 /* Get the cluster offset */
 282 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 283                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 284 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 285                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 286
 287 /*
 288  * Structure of a blocks group descriptor
 289  */
 290 struct ext4_group_desc
 291 {
 292         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 293         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 294         __le32  bg_inode_table_lo;      /* Inodes table block */
 295         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 296         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 297         __le16  bg_used_dirs_count_lo;  /* Directories count */
 298         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 299         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 300         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 301         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 302         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 303         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 304         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 305         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 306         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 307         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 308         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 309         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 310         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 311         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 312         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 313         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 314         __u32   bg_reserved;
 315 };
 316
 317 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 318         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 319          sizeof(__le16))
 320 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 321         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 322          sizeof(__le16))
 323
 324 /*
 325  * Structure of a flex block group info
 326  */
 327
 328 struct flex_groups {
 329         atomic64_t      free_clusters;
 330         atomic_t        free_inodes;
 331         atomic_t        used_dirs;
 332 };
 333
 334 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 335 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 336 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 337
 338 /*
 339  * Macro-instructions used to manage group descriptors
 340  */
 341 #define EXT4_MIN_DESC_SIZE              32
 342 #define EXT4_MIN_DESC_SIZE_64BIT        64
 343 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 344 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 345 #ifdef __KERNEL__
 346 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 347 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 348 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 349 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 350 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 351 #else
 352 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 353 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 354 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 355 #endif
 356
 357 /*
 358  * Constants relative to the data blocks
 359  */
 360 #define EXT4_NDIR_BLOCKS                12
 361 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 362 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 363 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 364 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 365
 366 /*
 367  * Inode flags
 368  */
 369 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 370 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 371 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 372 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 373 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 374 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 375 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 376 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 377 /* Reserved for compression usage... */
 378 #define EXT4_DIRTY_FL                   0x00000100
 379 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 380 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 381         /* nb: was previously EXT2_ECOMPR_FL */
 382 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 383 /* End compression flags --- maybe not all used */
 384 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 385 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 386 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 387 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 388 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 389 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 390 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 391 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 392 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 393 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 394 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 395 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 396 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 397
 398 #define EXT4_FL_USER_VISIBLE            0x304BDFFF /* User visible flags */
 399 #define EXT4_FL_USER_MODIFIABLE         0x204380FF /* User modifiable flags */
 400
 401 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 402                                          EXT4_IMMUTABLE_FL | \
 403                                          EXT4_APPEND_FL | \
 404                                          EXT4_NODUMP_FL | \
 405                                          EXT4_NOATIME_FL | \
 406                                          EXT4_PROJINHERIT_FL)
 407
 408 /* Flags that should be inherited by new inodes from their parent. */
 409 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 410                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 411                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 412                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 413                            EXT4_PROJINHERIT_FL)
 414
 415 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 416 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 417
 418 /* Flags that are appropriate for non-directories/regular files. */
 419 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 420
 421 /* Mask out flags that are inappropriate for the given type of inode. */
 422 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 423 {
 424         if (S_ISDIR(mode))
 425                 return flags;
 426         else if (S_ISREG(mode))
 427                 return flags & EXT4_REG_FLMASK;
 428         else
 429                 return flags & EXT4_OTHER_FLMASK;
 430 }
 431
 432 /*
 433  * Inode flags used for atomic set/get
 434  */
 435 enum {
 436         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 437         EXT4_INODE_UNRM         = 1,    /* Undelete */
 438         EXT4_INODE_COMPR        = 2,    /* Compress file */
 439         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 440         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 441         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 442         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 443         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 444 /* Reserved for compression usage... */
 445         EXT4_INODE_DIRTY        = 8,
 446         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 447         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 448         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 449 /* End compression flags --- maybe not all used */
 450         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 451         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 452         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 453         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 454         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 455         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 456         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 457         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 458         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 459         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 460         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 461         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 462         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 463 };
 464
 465 /*
 466  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 467  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 468  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 469  * any extra space in the compiled kernel image, otherwise, the build will fail.
 470  * It's important that these values are the same, since we are using
 471  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 472  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 473  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 474  * defined in e2fsprogs.
 475  *
 476  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 477  */
 478 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 479 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 480
 481 static inline void ext4_check_flag_values(void)
 482 {
 483         CHECK_FLAG_VALUE(SECRM);
 484         CHECK_FLAG_VALUE(UNRM);
 485         CHECK_FLAG_VALUE(COMPR);
 486         CHECK_FLAG_VALUE(SYNC);
 487         CHECK_FLAG_VALUE(IMMUTABLE);
 488         CHECK_FLAG_VALUE(APPEND);
 489         CHECK_FLAG_VALUE(NODUMP);
 490         CHECK_FLAG_VALUE(NOATIME);
 491         CHECK_FLAG_VALUE(DIRTY);
 492         CHECK_FLAG_VALUE(COMPRBLK);
 493         CHECK_FLAG_VALUE(NOCOMPR);
 494         CHECK_FLAG_VALUE(ENCRYPT);
 495         CHECK_FLAG_VALUE(INDEX);
 496         CHECK_FLAG_VALUE(IMAGIC);
 497         CHECK_FLAG_VALUE(JOURNAL_DATA);
 498         CHECK_FLAG_VALUE(NOTAIL);
 499         CHECK_FLAG_VALUE(DIRSYNC);
 500         CHECK_FLAG_VALUE(TOPDIR);
 501         CHECK_FLAG_VALUE(HUGE_FILE);
 502         CHECK_FLAG_VALUE(EXTENTS);
 503         CHECK_FLAG_VALUE(EA_INODE);
 504         CHECK_FLAG_VALUE(EOFBLOCKS);
 505         CHECK_FLAG_VALUE(INLINE_DATA);
 506         CHECK_FLAG_VALUE(PROJINHERIT);
 507         CHECK_FLAG_VALUE(RESERVED);
 508 }
 509
 510 /* Used to pass group descriptor data when online resize is done */
 511 struct ext4_new_group_input {
 512         __u32 group;            /* Group number for this data */
 513         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 514         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 515         __u64 inode_table;      /* Absolute block number of inode table start */
 516         __u32 blocks_count;     /* Total number of blocks in this group */
 517         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 518         __u16 unused;
 519 };
 520
 521 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 522 struct compat_ext4_new_group_input {
 523         u32 group;
 524         compat_u64 block_bitmap;
 525         compat_u64 inode_bitmap;
 526         compat_u64 inode_table;
 527         u32 blocks_count;
 528         u16 reserved_blocks;
 529         u16 unused;
 530 };
 531 #endif
 532
 533 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 534 struct ext4_new_group_data {
 535         __u32 group;
 536         __u64 block_bitmap;
 537         __u64 inode_bitmap;
 538         __u64 inode_table;
 539         __u32 blocks_count;
 540         __u16 reserved_blocks;
 541         __u16 unused;
 542         __u32 free_blocks_count;
 543 };
 544
 545 /* Indexes used to index group tables in ext4_new_group_data */
 546 enum {
 547         BLOCK_BITMAP = 0,       /* block bitmap */
 548         INODE_BITMAP,           /* inode bitmap */
 549         INODE_TABLE,            /* inode tables */
 550         GROUP_TABLE_COUNT,
 551 };
 552
 553 /*
 554  * Flags used by ext4_map_blocks()
 555  */
 556         /* Allocate any needed blocks and/or convert an unwritten
 557            extent to be an initialized ext4 */
 558 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 559         /* Request the creation of an unwritten extent */
 560 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 561 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 562                                                  EXT4_GET_BLOCKS_CREATE)
 563         /* Caller is from the delayed allocation writeout path
 564          * finally doing the actual allocation of delayed blocks */
 565 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 566         /* caller is from the direct IO path, request to creation of an
 567         unwritten extents if not allocated, split the unwritten
 568         extent if blocks has been preallocated already*/
 569 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 570 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 571 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 572                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 573         /* Convert extent to initialized after IO complete */
 574 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 575                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 576         /* Eventual metadata allocation (due to growing extent tree)
 577          * should not fail, so try to use reserved blocks for that.*/
 578 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 579         /* Don't normalize allocation size (used for fallocate) */
 580 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 581         /* Request will not result in inode size update (user for fallocate) */
 582 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 583         /* Convert written extents to unwritten */
 584 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 585         /* Write zeros to newly created written extents */
 586 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 587 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 588                                         EXT4_GET_BLOCKS_ZERO)
 589         /* Caller will submit data before dropping transaction handle. This
 590          * allows jbd2 to avoid submitting data before commit. */
 591 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 592
 593 /*
 594  * The bit position of these flags must not overlap with any of the
 595  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 596  * read_extent_tree_block(), ext4_split_extent_at(),
 597  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 598  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 599  * caching the extents when reading from the extent tree while a
 600  * truncate or punch hole operation is in progress.
 601  */
 602 #define EXT4_EX_NOCACHE                         0x40000000
 603 #define EXT4_EX_FORCE_CACHE                     0x20000000
 604
 605 /*
 606  * Flags used by ext4_free_blocks
 607  */
 608 #define EXT4_FREE_BLOCKS_METADATA       0x0001
 609 #define EXT4_FREE_BLOCKS_FORGET         0x0002
 610 #define EXT4_FREE_BLOCKS_VALIDATED      0x0004
 611 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
 612 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 613 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 614
 615 /*
 616  * ioctl commands
 617  */
 618 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 619 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 620 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 621 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 622 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 623 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 624 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 625 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 626 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 627 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 628 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 629  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 630  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 631 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 632 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 633 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 634 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 635 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 636 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 637 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 638 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 639
 640 #ifndef FS_IOC_FSGETXATTR
 641 /* Until the uapi changes get merged for project quota... */
 642
 643 #define FS_IOC_FSGETXATTR               _IOR('X', 31, struct fsxattr)
 644 #define FS_IOC_FSSETXATTR               _IOW('X', 32, struct fsxattr)
 645
 646 /*
 647  * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
 648  */
 649 struct fsxattr {
 650         __u32           fsx_xflags;     /* xflags field value (get/set) */
 651         __u32           fsx_extsize;    /* extsize field value (get/set)*/
 652         __u32           fsx_nextents;   /* nextents field value (get)   */
 653         __u32           fsx_projid;     /* project identifier (get/set) */
 654         unsigned char   fsx_pad[12];
 655 };
 656
 657 /*
 658  * Flags for the fsx_xflags field
 659  */
 660 #define FS_XFLAG_REALTIME       0x00000001      /* data in realtime volume */
 661 #define FS_XFLAG_PREALLOC       0x00000002      /* preallocated file extents */
 662 #define FS_XFLAG_IMMUTABLE      0x00000008      /* file cannot be modified */
 663 #define FS_XFLAG_APPEND         0x00000010      /* all writes append */
 664 #define FS_XFLAG_SYNC           0x00000020      /* all writes synchronous */
 665 #define FS_XFLAG_NOATIME        0x00000040      /* do not update access time */
 666 #define FS_XFLAG_NODUMP         0x00000080      /* do not include in backups */
 667 #define FS_XFLAG_RTINHERIT      0x00000100      /* create with rt bit set */
 668 #define FS_XFLAG_PROJINHERIT    0x00000200      /* create with parents projid */
 669 #define FS_XFLAG_NOSYMLINKS     0x00000400      /* disallow symlink creation */
 670 #define FS_XFLAG_EXTSIZE        0x00000800      /* extent size allocator hint */
 671 #define FS_XFLAG_EXTSZINHERIT   0x00001000      /* inherit inode extent size */
 672 #define FS_XFLAG_NODEFRAG       0x00002000      /* do not defragment */
 673 #define FS_XFLAG_FILESTREAM     0x00004000      /* use filestream allocator */
 674 #define FS_XFLAG_HASATTR        0x80000000      /* no DIFLAG for this */
 675 #endif /* !defined(FS_IOC_FSGETXATTR) */
 676
 677 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 678 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 679
 680 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 681 /*
 682  * ioctl commands in 32 bit emulation
 683  */
 684 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 685 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 686 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 687 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 688 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 689 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 690 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 691 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 692 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 693 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 694 #endif
 695
 696 /* Max physical block we can address w/o extents */
 697 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 698
 699 /*
 700  * Structure of an inode on the disk
 701  */
 702 struct ext4_inode {
 703         __le16  i_mode;         /* File mode */
 704         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 705         __le32  i_size_lo;      /* Size in bytes */
 706         __le32  i_atime;        /* Access time */
 707         __le32  i_ctime;        /* Inode Change time */
 708         __le32  i_mtime;        /* Modification time */
 709         __le32  i_dtime;        /* Deletion Time */
 710         __le16  i_gid;          /* Low 16 bits of Group Id */
 711         __le16  i_links_count;  /* Links count */
 712         __le32  i_blocks_lo;    /* Blocks count */
 713         __le32  i_flags;        /* File flags */
 714         union {
 715                 struct {
 716                         __le32  l_i_version;
 717                 } linux1;
 718                 struct {
 719                         __u32  h_i_translator;
 720                 } hurd1;
 721                 struct {
 722                         __u32  m_i_reserved1;
 723                 } masix1;
 724         } osd1;                         /* OS dependent 1 */
 725         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 726         __le32  i_generation;   /* File version (for NFS) */
 727         __le32  i_file_acl_lo;  /* File ACL */
 728         __le32  i_size_high;
 729         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 730         union {
 731                 struct {
 732                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 733                         __le16  l_i_file_acl_high;
 734                         __le16  l_i_uid_high;   /* these 2 fields */
 735                         __le16  l_i_gid_high;   /* were reserved2[0] */
 736                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 737                         __le16  l_i_reserved;
 738                 } linux2;
 739                 struct {
 740                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 741                         __u16   h_i_mode_high;
 742                         __u16   h_i_uid_high;
 743                         __u16   h_i_gid_high;
 744                         __u32   h_i_author;
 745                 } hurd2;
 746                 struct {
 747                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 748                         __le16  m_i_file_acl_high;
 749                         __u32   m_i_reserved2[2];
 750                 } masix2;
 751         } osd2;                         /* OS dependent 2 */
 752         __le16  i_extra_isize;
 753         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 754         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 755         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 756         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 757         __le32  i_crtime;       /* File Creation time */
 758         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 759         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 760         __le32  i_projid;       /* Project ID */
 761 };
 762
 763 struct move_extent {
 764         __u32 reserved;         /* should be zero */
 765         __u32 donor_fd;         /* donor file descriptor */
 766         __u64 orig_start;       /* logical start offset in block for orig */
 767         __u64 donor_start;      /* logical start offset in block for donor */
 768         __u64 len;              /* block length to be moved */
 769         __u64 moved_len;        /* moved block length */
 770 };
 771
 772 #define EXT4_EPOCH_BITS 2
 773 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 774 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 775
 776 /*
 777  * Extended fields will fit into an inode if the filesystem was formatted
 778  * with large inodes (-I 256 or larger) and there are not currently any EAs
 779  * consuming all of the available space. For new inodes we always reserve
 780  * enough space for the kernel's known extended fields, but for inodes
 781  * created with an old kernel this might not have been the case. None of
 782  * the extended inode fields is critical for correct filesystem operation.
 783  * This macro checks if a certain field fits in the inode. Note that
 784  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 785  */
 786 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 787         ((offsetof(typeof(*ext4_inode), field) +        \
 788           sizeof((ext4_inode)->field))                  \
 789         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 790             (einode)->i_extra_isize))                   \
 791
 792 /*
 793  * We use an encoding that preserves the times for extra epoch "00":
 794  *
 795  * extra  msb of                         adjust for signed
 796  * epoch  32-bit                         32-bit tv_sec to
 797  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 798  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 799  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 800  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 801  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 802  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 803  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 804  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 805  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 806  *
 807  * Note that previous versions of the kernel on 64-bit systems would
 808  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 809  * 1970.  e2fsck will correct this, assuming that it is run on the
 810  * affected filesystem before 2242.
 811  */
 812
 813 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 814 {
 815         u32 extra = sizeof(time->tv_sec) > 4 ?
 816                 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
 817         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 818 }
 819
 820 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 821 {
 822         if (unlikely(sizeof(time->tv_sec) > 4 &&
 823                         (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
 824 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
 825                 /* Handle legacy encoding of pre-1970 dates with epoch
 826                  * bits 1,1.  We assume that by kernel version 4.20,
 827                  * everyone will have run fsck over the affected
 828                  * filesystems to correct the problem.  (This
 829                  * backwards compatibility may be removed before this
 830                  * time, at the discretion of the ext4 developers.)
 831                  */
 832                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
 833                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
 834                         extra_bits = 0;
 835                 time->tv_sec += extra_bits << 32;
 836 #else
 837                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 838 #endif
 839         }
 840         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 841 }
 842
 843 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 844 do {                                                                           \
 845         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 846         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 847                 (raw_inode)->xtime ## _extra =                                 \
 848                                 ext4_encode_extra_time(&(inode)->xtime);       \
 849 } while (0)
 850
 851 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 852 do {                                                                           \
 853         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 854                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 855         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 856                 (raw_inode)->xtime ## _extra =                                 \
 857                                 ext4_encode_extra_time(&(einode)->xtime);      \
 858 } while (0)
 859
 860 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 861 do {                                                                           \
 862         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 863         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 864                 ext4_decode_extra_time(&(inode)->xtime,                        \
 865                                        raw_inode->xtime ## _extra);            \
 866         else                                                                   \
 867                 (inode)->xtime.tv_nsec = 0;                                    \
 868 } while (0)
 869
 870 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 871 do {                                                                           \
 872         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 873                 (einode)->xtime.tv_sec =                                       \
 874                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 875         else                                                                   \
 876                 (einode)->xtime.tv_sec = 0;                                    \
 877         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 878                 ext4_decode_extra_time(&(einode)->xtime,                       \
 879                                        raw_inode->xtime ## _extra);            \
 880         else                                                                   \
 881                 (einode)->xtime.tv_nsec = 0;                                   \
 882 } while (0)
 883
 884 #define i_disk_version osd1.linux1.l_i_version
 885
 886 #if defined(__KERNEL__) || defined(__linux__)
 887 #define i_reserved1     osd1.linux1.l_i_reserved1
 888 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 889 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 890 #define i_uid_low       i_uid
 891 #define i_gid_low       i_gid
 892 #define i_uid_high      osd2.linux2.l_i_uid_high
 893 #define i_gid_high      osd2.linux2.l_i_gid_high
 894 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 895
 896 #elif defined(__GNU__)
 897
 898 #define i_translator    osd1.hurd1.h_i_translator
 899 #define i_uid_high      osd2.hurd2.h_i_uid_high
 900 #define i_gid_high      osd2.hurd2.h_i_gid_high
 901 #define i_author        osd2.hurd2.h_i_author
 902
 903 #elif defined(__masix__)
 904
 905 #define i_reserved1     osd1.masix1.m_i_reserved1
 906 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 907 #define i_reserved2     osd2.masix2.m_i_reserved2
 908
 909 #endif /* defined(__KERNEL__) || defined(__linux__) */
 910
 911 #include "extents_status.h"
 912
 913 /*
 914  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 915  *
 916  * These are needed to avoid lockdep false positives when we need to
 917  * allocate blocks to the quota inode during ext4_map_blocks(), while
 918  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 919  * do quota tracking for the quota inode, this avoids deadlock (as
 920  * well as infinite recursion, since it isn't turtles all the way
 921  * down...)
 922  *
 923  *  I_DATA_SEM_NORMAL - Used for most inodes
 924  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 925  *                        where the second inode has larger inode number
 926  *                        than the first
 927  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 928  */
 929 enum {
 930         I_DATA_SEM_NORMAL = 0,
 931         I_DATA_SEM_OTHER,
 932         I_DATA_SEM_QUOTA,
 933 };
 934
 935
 936 /*
 937  * fourth extended file system inode data in memory
 938  */
 939 struct ext4_inode_info {
 940         __le32  i_data[15];     /* unconverted */
 941         __u32   i_dtime;
 942         ext4_fsblk_t    i_file_acl;
 943
 944         /*
 945          * i_block_group is the number of the block group which contains
 946          * this file's inode.  Constant across the lifetime of the inode,
 947          * it is ued for making block allocation decisions - we try to
 948          * place a file's data blocks near its inode block, and new inodes
 949          * near to their parent directory's inode.
 950          */
 951         ext4_group_t    i_block_group;
 952         ext4_lblk_t     i_dir_start_lookup;
 953 #if (BITS_PER_LONG < 64)
 954         unsigned long   i_state_flags;          /* Dynamic state flags */
 955 #endif
 956         unsigned long   i_flags;
 957
 958         /*
 959          * Extended attributes can be read independently of the main file
 960          * data. Taking i_mutex even when reading would cause contention
 961          * between readers of EAs and writers of regular file data, so
 962          * instead we synchronize on xattr_sem when reading or changing
 963          * EAs.
 964          */
 965         struct rw_semaphore xattr_sem;
 966
 967         struct list_head i_orphan;      /* unlinked but open inodes */
 968
 969         /*
 970          * i_disksize keeps track of what the inode size is ON DISK, not
 971          * in memory.  During truncate, i_size is set to the new size by
 972          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 973          * set i_disksize to 0 until the truncate is actually under way.
 974          *
 975          * The intent is that i_disksize always represents the blocks which
 976          * are used by this file.  This allows recovery to restart truncate
 977          * on orphans if we crash during truncate.  We actually write i_disksize
 978          * into the on-disk inode when writing inodes out, instead of i_size.
 979          *
 980          * The only time when i_disksize and i_size may be different is when
 981          * a truncate is in progress.  The only things which change i_disksize
 982          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 983          */
 984         loff_t  i_disksize;
 985
 986         /*
 987          * i_data_sem is for serialising ext4_truncate() against
 988          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 989          * data tree are chopped off during truncate. We can't do that in
 990          * ext4 because whenever we perform intermediate commits during
 991          * truncate, the inode and all the metadata blocks *must* be in a
 992          * consistent state which allows truncation of the orphans to restart
 993          * during recovery.  Hence we must fix the get_block-vs-truncate race
 994          * by other means, so we have i_data_sem.
 995          */
 996         struct rw_semaphore i_data_sem;
 997         /*
 998          * i_mmap_sem is for serializing page faults with truncate / punch hole
 999          * operations. We have to make sure that new page cannot be faulted in
1000          * a section of the inode that is being punched. We cannot easily use
1001          * i_data_sem for this since we need protection for the whole punch
1002          * operation and i_data_sem ranks below transaction start so we have
1003          * to occasionally drop it.
1004          */
1005         struct rw_semaphore i_mmap_sem;
1006         struct inode vfs_inode;
1007         struct jbd2_inode *jinode;
1008
1009         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1010
1011         /*
1012          * File creation time. Its function is same as that of
1013          * struct timespec i_{a,c,m}time in the generic inode.
1014          */
1015         struct timespec i_crtime;
1016
1017         /* mballoc */
1018         struct list_head i_prealloc_list;
1019         spinlock_t i_prealloc_lock;
1020
1021         /* extents status tree */
1022         struct ext4_es_tree i_es_tree;
1023         rwlock_t i_es_lock;
1024         struct list_head i_es_list;
1025         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1026         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1027         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1028                                            extents to shrink. Protected by
1029                                            i_es_lock  */
1030
1031         /* ialloc */
1032         ext4_group_t    i_last_alloc_group;
1033
1034         /* allocation reservation info for delalloc */
1035         /* In case of bigalloc, these refer to clusters rather than blocks */
1036         unsigned int i_reserved_data_blocks;
1037         unsigned int i_reserved_meta_blocks;
1038         unsigned int i_allocated_meta_blocks;
1039         ext4_lblk_t i_da_metadata_calc_last_lblock;
1040         int i_da_metadata_calc_len;
1041
1042         /* on-disk additional length */
1043         __u16 i_extra_isize;
1044
1045         /* Indicate the inline data space. */
1046         u16 i_inline_off;
1047         u16 i_inline_size;
1048
1049 #ifdef CONFIG_QUOTA
1050         /* quota space reservation, managed internally by quota code */
1051         qsize_t i_reserved_quota;
1052 #endif
1053
1054         /* Lock protecting lists below */
1055         spinlock_t i_completed_io_lock;
1056         /*
1057          * Completed IOs that need unwritten extents handling and have
1058          * transaction reserved
1059          */
1060         struct list_head i_rsv_conversion_list;
1061         struct work_struct i_rsv_conversion_work;
1062         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1063
1064         spinlock_t i_block_reservation_lock;
1065
1066         /*
1067          * Transactions that contain inode's metadata needed to complete
1068          * fsync and fdatasync, respectively.
1069          */
1070         tid_t i_sync_tid;
1071         tid_t i_datasync_tid;
1072
1073 #ifdef CONFIG_QUOTA
1074         struct dquot *i_dquot[MAXQUOTAS];
1075 #endif
1076
1077         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1078         __u32 i_csum_seed;
1079
1080         kprojid_t i_projid;
1081 };
1082
1083 /*
1084  * File system states
1085  */
1086 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1087 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1088 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1089
1090 /*
1091  * Misc. filesystem flags
1092  */
1093 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1094 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1095 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1096
1097 /*
1098  * Mount flags set via mount options or defaults
1099  */
1100 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1101 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1102 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1103 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1104 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1105 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1106 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1107 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1108 #ifdef CONFIG_FS_DAX
1109 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1110 #else
1111 #define EXT4_MOUNT_DAX                  0
1112 #endif
1113 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1114 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1115 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1116 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1117 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1118 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1119 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1120 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1121 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1122 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1123 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1124 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1125                                                  * enable enforcement for hidden
1126                                                  * quota files */
1127 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1128                                                   * enforcement for hidden quota
1129                                                   * files */
1130 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1131                                                   * enforcement */
1132 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1133 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1134 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1135 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1136 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1137 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1138 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1139 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1140
1141 /*
1142  * Mount flags set either automatically (could not be set by mount option)
1143  * based on per file system feature or property or in special cases such as
1144  * distinguishing between explicit mount option definition and default.
1145  */
1146 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1147                                                       specified delalloc */
1148 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1149                                                       size of blocksize * 8
1150                                                       blocks */
1151 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1152                                                       file systems */
1153
1154 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1155                                                 specified journal checksum */
1156
1157 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1158                                                 ~EXT4_MOUNT_##opt
1159 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1160                                                 EXT4_MOUNT_##opt
1161 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1162                                          EXT4_MOUNT_##opt)
1163
1164 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1165                                                 ~EXT4_MOUNT2_##opt
1166 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1167                                                 EXT4_MOUNT2_##opt
1168 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1169                                          EXT4_MOUNT2_##opt)
1170
1171 #define ext4_test_and_set_bit           __test_and_set_bit_le
1172 #define ext4_set_bit                    __set_bit_le
1173 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1174 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1175 #define ext4_clear_bit                  __clear_bit_le
1176 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1177 #define ext4_test_bit                   test_bit_le
1178 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1179 #define ext4_find_next_bit              find_next_bit_le
1180
1181 extern void ext4_set_bits(void *bm, int cur, int len);
1182
1183 /*
1184  * Maximal mount counts between two filesystem checks
1185  */
1186 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1187 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1188
1189 /*
1190  * Behaviour when detecting errors
1191  */
1192 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1193 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1194 #define EXT4_ERRORS_PANIC               3       /* Panic */
1195 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1196
1197 /* Metadata checksum algorithm codes */
1198 #define EXT4_CRC32C_CHKSUM              1
1199
1200 /*
1201  * Structure of the super block
1202  */
1203 struct ext4_super_block {
1204 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1205         __le32  s_blocks_count_lo;      /* Blocks count */
1206         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1207         __le32  s_free_blocks_count_lo; /* Free blocks count */
1208 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1209         __le32  s_first_data_block;     /* First Data Block */
1210         __le32  s_log_block_size;       /* Block size */
1211         __le32  s_log_cluster_size;     /* Allocation cluster size */
1212 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1213         __le32  s_clusters_per_group;   /* # Clusters per group */
1214         __le32  s_inodes_per_group;     /* # Inodes per group */
1215         __le32  s_mtime;                /* Mount time */
1216 /*30*/  __le32  s_wtime;                /* Write time */
1217         __le16  s_mnt_count;            /* Mount count */
1218         __le16  s_max_mnt_count;        /* Maximal mount count */
1219         __le16  s_magic;                /* Magic signature */
1220         __le16  s_state;                /* File system state */
1221         __le16  s_errors;               /* Behaviour when detecting errors */
1222         __le16  s_minor_rev_level;      /* minor revision level */
1223 /*40*/  __le32  s_lastcheck;            /* time of last check */
1224         __le32  s_checkinterval;        /* max. time between checks */
1225         __le32  s_creator_os;           /* OS */
1226         __le32  s_rev_level;            /* Revision level */
1227 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1228         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1229         /*
1230          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1231          *
1232          * Note: the difference between the compatible feature set and
1233          * the incompatible feature set is that if there is a bit set
1234          * in the incompatible feature set that the kernel doesn't
1235          * know about, it should refuse to mount the filesystem.
1236          *
1237          * e2fsck's requirements are more strict; if it doesn't know
1238          * about a feature in either the compatible or incompatible
1239          * feature set, it must abort and not try to meddle with
1240          * things it doesn't understand...
1241          */
1242         __le32  s_first_ino;            /* First non-reserved inode */
1243         __le16  s_inode_size;           /* size of inode structure */
1244         __le16  s_block_group_nr;       /* block group # of this superblock */
1245         __le32  s_feature_compat;       /* compatible feature set */
1246 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1247         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1248 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1249 /*78*/  char    s_volume_name[16];      /* volume name */
1250 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
1251 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1252         /*
1253          * Performance hints.  Directory preallocation should only
1254          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1255          */
1256         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1257         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1258         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1259         /*
1260          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1261          */
1262 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1263 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1264         __le32  s_journal_dev;          /* device number of journal file */
1265         __le32  s_last_orphan;          /* start of list of inodes to delete */
1266         __le32  s_hash_seed[4];         /* HTREE hash seed */
1267         __u8    s_def_hash_version;     /* Default hash version to use */
1268         __u8    s_jnl_backup_type;
1269         __le16  s_desc_size;            /* size of group descriptor */
1270 /*100*/ __le32  s_default_mount_opts;
1271         __le32  s_first_meta_bg;        /* First metablock block group */
1272         __le32  s_mkfs_time;            /* When the filesystem was created */
1273         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1274         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1275 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1276         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1277         __le32  s_free_blocks_count_hi; /* Free blocks count */
1278         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1279         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1280         __le32  s_flags;                /* Miscellaneous flags */
1281         __le16  s_raid_stride;          /* RAID stride */
1282         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1283         __le64  s_mmp_block;            /* Block for multi-mount protection */
1284         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1285         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1286         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1287         __u8    s_encryption_level;     /* versioning level for encryption */
1288         __u8    s_reserved_pad;         /* Padding to next 32bits */
1289         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1290         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1291         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1292         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1293                                               snapshot's future use */
1294         __le32  s_snapshot_list;        /* inode number of the head of the
1295                                            on-disk snapshot list */
1296 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1297         __le32  s_error_count;          /* number of fs errors */
1298         __le32  s_first_error_time;     /* first time an error happened */
1299         __le32  s_first_error_ino;      /* inode involved in first error */
1300         __le64  s_first_error_block;    /* block involved of first error */
1301         __u8    s_first_error_func[32]; /* function where the error happened */
1302         __le32  s_first_error_line;     /* line number where error happened */
1303         __le32  s_last_error_time;      /* most recent time of an error */
1304         __le32  s_last_error_ino;       /* inode involved in last error */
1305         __le32  s_last_error_line;      /* line number where error happened */
1306         __le64  s_last_error_block;     /* block involved of last error */
1307         __u8    s_last_error_func[32];  /* function where the error happened */
1308 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1309         __u8    s_mount_opts[64];
1310         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1311         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1312         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1313         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1314         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1315         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1316         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1317         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1318         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1319         __le32  s_reserved[98];         /* Padding to the end of the block */
1320         __le32  s_checksum;             /* crc32c(superblock) */
1321 };
1322
1323 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1324
1325 #ifdef __KERNEL__
1326
1327 /*
1328  * run-time mount flags
1329  */
1330 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1331 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1332 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1333
1334 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1335 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1336                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1337 #else
1338 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1339 #endif
1340
1341 /* Number of quota types we support */
1342 #define EXT4_MAXQUOTAS 3
1343
1344 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1345 #define EXT4_KEY_DESC_PREFIX "ext4:"
1346 #define EXT4_KEY_DESC_PREFIX_SIZE 5
1347 #endif
1348
1349 /*
1350  * fourth extended-fs super-block data in memory
1351  */
1352 struct ext4_sb_info {
1353         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1354         unsigned long s_inodes_per_block;/* Number of inodes per block */
1355         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1356         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1357         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1358         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1359         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1360         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1361         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1362         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1363         unsigned long s_overhead;  /* # of fs overhead clusters */
1364         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1365         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1366         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1367         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1368         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1369         struct buffer_head **s_group_desc;
1370         unsigned int s_mount_opt;
1371         unsigned int s_mount_opt2;
1372         unsigned int s_mount_flags;
1373         unsigned int s_def_mount_opt;
1374         ext4_fsblk_t s_sb_block;
1375         atomic64_t s_resv_clusters;
1376         kuid_t s_resuid;
1377         kgid_t s_resgid;
1378         unsigned short s_mount_state;
1379         unsigned short s_pad;
1380         int s_addr_per_block_bits;
1381         int s_desc_per_block_bits;
1382         int s_inode_size;
1383         int s_first_ino;
1384         unsigned int s_inode_readahead_blks;
1385         unsigned int s_inode_goal;
1386         spinlock_t s_next_gen_lock;
1387         u32 s_next_generation;
1388         u32 s_hash_seed[4];
1389         int s_def_hash_version;
1390         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1391         struct percpu_counter s_freeclusters_counter;
1392         struct percpu_counter s_freeinodes_counter;
1393         struct percpu_counter s_dirs_counter;
1394         struct percpu_counter s_dirtyclusters_counter;
1395         struct blockgroup_lock *s_blockgroup_lock;
1396         struct proc_dir_entry *s_proc;
1397         struct kobject s_kobj;
1398         struct completion s_kobj_unregister;
1399         struct super_block *s_sb;
1400
1401         /* Journaling */
1402         struct journal_s *s_journal;
1403         struct list_head s_orphan;
1404         struct mutex s_orphan_lock;
1405         unsigned long s_resize_flags;           /* Flags indicating if there
1406                                                    is a resizer */
1407         unsigned long s_commit_interval;
1408         u32 s_max_batch_time;
1409         u32 s_min_batch_time;
1410         struct block_device *journal_bdev;
1411 #ifdef CONFIG_QUOTA
1412         char *s_qf_names[EXT4_MAXQUOTAS];       /* Names of quota files with journalled quota */
1413         int s_jquota_fmt;                       /* Format of quota to use */
1414 #endif
1415         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1416         struct rb_root system_blks;
1417
1418 #ifdef EXTENTS_STATS
1419         /* ext4 extents stats */
1420         unsigned long s_ext_min;
1421         unsigned long s_ext_max;
1422         unsigned long s_depth_max;
1423         spinlock_t s_ext_stats_lock;
1424         unsigned long s_ext_blocks;
1425         unsigned long s_ext_extents;
1426 #endif
1427
1428         /* for buddy allocator */
1429         struct ext4_group_info ***s_group_info;
1430         struct inode *s_buddy_cache;
1431         spinlock_t s_md_lock;
1432         unsigned short *s_mb_offsets;
1433         unsigned int *s_mb_maxs;
1434         unsigned int s_group_info_size;
1435         unsigned int s_mb_free_pending;
1436
1437         /* tunables */
1438         unsigned long s_stripe;
1439         unsigned int s_mb_stream_request;
1440         unsigned int s_mb_max_to_scan;
1441         unsigned int s_mb_min_to_scan;
1442         unsigned int s_mb_stats;
1443         unsigned int s_mb_order2_reqs;
1444         unsigned int s_mb_group_prealloc;
1445         unsigned int s_max_dir_size_kb;
1446         /* where last allocation was done - for stream allocation */
1447         unsigned long s_mb_last_group;
1448         unsigned long s_mb_last_start;
1449
1450         /* stats for buddy allocator */
1451         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1452         atomic_t s_bal_success; /* we found long enough chunks */
1453         atomic_t s_bal_allocated;       /* in blocks */
1454         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1455         atomic_t s_bal_goals;   /* goal hits */
1456         atomic_t s_bal_breaks;  /* too long searches */
1457         atomic_t s_bal_2orders; /* 2^order hits */
1458         spinlock_t s_bal_lock;
1459         unsigned long s_mb_buddies_generated;
1460         unsigned long long s_mb_generation_time;
1461         atomic_t s_mb_lost_chunks;
1462         atomic_t s_mb_preallocated;
1463         atomic_t s_mb_discarded;
1464         atomic_t s_lock_busy;
1465
1466         /* locality groups */
1467         struct ext4_locality_group __percpu *s_locality_groups;
1468
1469         /* for write statistics */
1470         unsigned long s_sectors_written_start;
1471         u64 s_kbytes_written;
1472
1473         /* the size of zero-out chunk */
1474         unsigned int s_extent_max_zeroout_kb;
1475
1476         unsigned int s_log_groups_per_flex;
1477         struct flex_groups *s_flex_groups;
1478         ext4_group_t s_flex_groups_allocated;
1479
1480         /* workqueue for reserved extent conversions (buffered io) */
1481         struct workqueue_struct *rsv_conversion_wq;
1482
1483         /* timer for periodic error stats printing */
1484         struct timer_list s_err_report;
1485
1486         /* Lazy inode table initialization info */
1487         struct ext4_li_request *s_li_request;
1488         /* Wait multiplier for lazy initialization thread */
1489         unsigned int s_li_wait_mult;
1490
1491         /* Kernel thread for multiple mount protection */
1492         struct task_struct *s_mmp_tsk;
1493
1494         /* record the last minlen when FITRIM is called. */
1495         atomic_t s_last_trim_minblks;
1496
1497         /* Reference to checksum algorithm driver via cryptoapi */
1498         struct crypto_shash *s_chksum_driver;
1499
1500         /* Precomputed FS UUID checksum for seeding other checksums */
1501         __u32 s_csum_seed;
1502
1503         /* Reclaim extents from extent status tree */
1504         struct shrinker s_es_shrinker;
1505         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1506         long s_es_nr_inode;
1507         struct ext4_es_stats s_es_stats;
1508         struct mb_cache *s_mb_cache;
1509         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1510
1511         /* Ratelimit ext4 messages. */
1512         struct ratelimit_state s_err_ratelimit_state;
1513         struct ratelimit_state s_warning_ratelimit_state;
1514         struct ratelimit_state s_msg_ratelimit_state;
1515
1516         /* Barrier between changing inodes' journal flags and writepages ops. */
1517         struct percpu_rw_semaphore s_journal_flag_rwsem;
1518
1519         /* Encryption support */
1520 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1521         u8 key_prefix[EXT4_KEY_DESC_PREFIX_SIZE];
1522         u8 key_prefix_size;
1523 #endif
1524 };
1525
1526 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1527 {
1528         return sb->s_fs_info;
1529 }
1530 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1531 {
1532         return container_of(inode, struct ext4_inode_info, vfs_inode);
1533 }
1534
1535 static inline struct timespec ext4_current_time(struct inode *inode)
1536 {
1537         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1538                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1539 }
1540
1541 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1542 {
1543         return ino == EXT4_ROOT_INO ||
1544                 ino == EXT4_USR_QUOTA_INO ||
1545                 ino == EXT4_GRP_QUOTA_INO ||
1546                 ino == EXT4_BOOT_LOADER_INO ||
1547                 ino == EXT4_JOURNAL_INO ||
1548                 ino == EXT4_RESIZE_INO ||
1549                 (ino >= EXT4_FIRST_INO(sb) &&
1550                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1551 }
1552
1553 /*
1554  * Inode dynamic state flags
1555  */
1556 enum {
1557         EXT4_STATE_JDATA,               /* journaled data exists */
1558         EXT4_STATE_NEW,                 /* inode is newly created */
1559         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1560         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1561         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1562         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1563         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1564         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1565         EXT4_STATE_DIOREAD_LOCK,        /* Disable support for dio read
1566                                            nolocking */
1567         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1568         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1569 };
1570
1571 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1572 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1573 {                                                                       \
1574         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1575 }                                                                       \
1576 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1577 {                                                                       \
1578         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1579 }                                                                       \
1580 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1581 {                                                                       \
1582         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1583 }
1584
1585 /* Add these declarations here only so that these functions can be
1586  * found by name.  Otherwise, they are very hard to locate. */
1587 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1588 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1589 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1590 EXT4_INODE_BIT_FNS(flag, flags, 0)
1591
1592 /* Add these declarations here only so that these functions can be
1593  * found by name.  Otherwise, they are very hard to locate. */
1594 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1595 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1596 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1597 #if (BITS_PER_LONG < 64)
1598 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1599
1600 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1601 {
1602         (ei)->i_state_flags = 0;
1603 }
1604 #else
1605 EXT4_INODE_BIT_FNS(state, flags, 32)
1606
1607 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1608 {
1609         /* We depend on the fact that callers will set i_flags */
1610 }
1611 #endif
1612 #else
1613 /* Assume that user mode programs are passing in an ext4fs superblock, not
1614  * a kernel struct super_block.  This will allow us to call the feature-test
1615  * macros from user land. */
1616 #define EXT4_SB(sb)     (sb)
1617 #endif
1618
1619 /*
1620  * Returns true if the inode is inode is encrypted
1621  */
1622 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1623
1624 /*
1625  * Codes for operating systems
1626  */
1627 #define EXT4_OS_LINUX           0
1628 #define EXT4_OS_HURD            1
1629 #define EXT4_OS_MASIX           2
1630 #define EXT4_OS_FREEBSD         3
1631 #define EXT4_OS_LITES           4
1632
1633 /*
1634  * Revision levels
1635  */
1636 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1637 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1638
1639 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1640 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1641
1642 #define EXT4_GOOD_OLD_INODE_SIZE 128
1643
1644 /*
1645  * Feature set definitions
1646  */
1647
1648 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1649 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1650 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1651 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1652 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1653 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1654 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1655
1656 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1657 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1658 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1659 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1660 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1661 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1662 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1663 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1664 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1665 /*
1666  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1667  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1668  * all other data structures' checksums.  However, the METADATA_CSUM and
1669  * GDT_CSUM bits are mutually exclusive.
1670  */
1671 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1672 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1673 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1674
1675 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1676 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1677 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1678 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1679 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1680 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1681 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1682 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1683 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1684 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1685 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1686 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1687 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1688 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1689 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1690
1691 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1692 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1693 { \
1694         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1695                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1696 } \
1697 static inline void ext4_set_feature_##name(struct super_block *sb) \
1698 { \
1699         EXT4_SB(sb)->s_es->s_feature_compat |= \
1700                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1701 } \
1702 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1703 { \
1704         EXT4_SB(sb)->s_es->s_feature_compat &= \
1705                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1706 }
1707
1708 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1709 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1710 { \
1711         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1712                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1713 } \
1714 static inline void ext4_set_feature_##name(struct super_block *sb) \
1715 { \
1716         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1717                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1718 } \
1719 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1720 { \
1721         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1722                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1723 }
1724
1725 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1726 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1727 { \
1728         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1729                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1730 } \
1731 static inline void ext4_set_feature_##name(struct super_block *sb) \
1732 { \
1733         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1734                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1735 } \
1736 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1737 { \
1738         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1739                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1740 }
1741
1742 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1743 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1744 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1745 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1746 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1747 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1748 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1749
1750 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1751 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1752 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1753 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1754 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1755 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1756 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1757 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1758 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1759 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1760 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1761 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1762
1763 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1764 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1765 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1766 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1767 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1768 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1769 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1770 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1771 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1772 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1773 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1774 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1775 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1776 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1777 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1778
1779 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1780 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1781                                          EXT4_FEATURE_INCOMPAT_META_BG)
1782 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1783                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1784                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1785
1786 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1787 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1788                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1789                                          EXT4_FEATURE_INCOMPAT_META_BG)
1790 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1791                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1792                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1793
1794 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1795 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1796                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1797                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1798                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1799                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1800                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1801                                          EXT4_FEATURE_INCOMPAT_MMP | \
1802                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1803                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1804                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED)
1805 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1806                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1807                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1808                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1809                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1810                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1811                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1812                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1813                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1814                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1815                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1816
1817 #define EXTN_FEATURE_FUNCS(ver) \
1818 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1819 { \
1820         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1821                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1822 } \
1823 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1824 { \
1825         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1826                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1827 } \
1828 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1829 { \
1830         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1831                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1832 }
1833
1834 EXTN_FEATURE_FUNCS(2)
1835 EXTN_FEATURE_FUNCS(3)
1836 EXTN_FEATURE_FUNCS(4)
1837
1838 static inline bool ext4_has_compat_features(struct super_block *sb)
1839 {
1840         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1841 }
1842 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1843 {
1844         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1845 }
1846 static inline bool ext4_has_incompat_features(struct super_block *sb)
1847 {
1848         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1849 }
1850
1851 /*
1852  * Default values for user and/or group using reserved blocks
1853  */
1854 #define EXT4_DEF_RESUID         0
1855 #define EXT4_DEF_RESGID         0
1856
1857 /*
1858  * Default project ID
1859  */
1860 #define EXT4_DEF_PROJID         0
1861
1862 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1863
1864 /*
1865  * Default mount options
1866  */
1867 #define EXT4_DEFM_DEBUG         0x0001
1868 #define EXT4_DEFM_BSDGROUPS     0x0002
1869 #define EXT4_DEFM_XATTR_USER    0x0004
1870 #define EXT4_DEFM_ACL           0x0008
1871 #define EXT4_DEFM_UID16         0x0010
1872 #define EXT4_DEFM_JMODE         0x0060
1873 #define EXT4_DEFM_JMODE_DATA    0x0020
1874 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1875 #define EXT4_DEFM_JMODE_WBACK   0x0060
1876 #define EXT4_DEFM_NOBARRIER     0x0100
1877 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1878 #define EXT4_DEFM_DISCARD       0x0400
1879 #define EXT4_DEFM_NODELALLOC    0x0800
1880
1881 /*
1882  * Default journal batch times
1883  */
1884 #define EXT4_DEF_MIN_BATCH_TIME 0
1885 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1886
1887 /*
1888  * Minimum number of groups in a flexgroup before we separate out
1889  * directories into the first block group of a flexgroup
1890  */
1891 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1892
1893 /*
1894  * Structure of a directory entry
1895  */
1896 #define EXT4_NAME_LEN 255
1897
1898 struct ext4_dir_entry {
1899         __le32  inode;                  /* Inode number */
1900         __le16  rec_len;                /* Directory entry length */
1901         __le16  name_len;               /* Name length */
1902         char    name[EXT4_NAME_LEN];    /* File name */
1903 };
1904
1905 /*
1906  * The new version of the directory entry.  Since EXT4 structures are
1907  * stored in intel byte order, and the name_len field could never be
1908  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1909  * file_type field.
1910  */
1911 struct ext4_dir_entry_2 {
1912         __le32  inode;                  /* Inode number */
1913         __le16  rec_len;                /* Directory entry length */
1914         __u8    name_len;               /* Name length */
1915         __u8    file_type;
1916         char    name[EXT4_NAME_LEN];    /* File name */
1917 };
1918
1919 /*
1920  * This is a bogus directory entry at the end of each leaf block that
1921  * records checksums.
1922  */
1923 struct ext4_dir_entry_tail {
1924         __le32  det_reserved_zero1;     /* Pretend to be unused */
1925         __le16  det_rec_len;            /* 12 */
1926         __u8    det_reserved_zero2;     /* Zero name length */
1927         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1928         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1929 };
1930
1931 #define EXT4_DIRENT_TAIL(block, blocksize) \
1932         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1933                                         ((blocksize) - \
1934                                          sizeof(struct ext4_dir_entry_tail))))
1935
1936 /*
1937  * Ext4 directory file types.  Only the low 3 bits are used.  The
1938  * other bits are reserved for now.
1939  */
1940 #define EXT4_FT_UNKNOWN         0
1941 #define EXT4_FT_REG_FILE        1
1942 #define EXT4_FT_DIR             2
1943 #define EXT4_FT_CHRDEV          3
1944 #define EXT4_FT_BLKDEV          4
1945 #define EXT4_FT_FIFO            5
1946 #define EXT4_FT_SOCK            6
1947 #define EXT4_FT_SYMLINK         7
1948
1949 #define EXT4_FT_MAX             8
1950
1951 #define EXT4_FT_DIR_CSUM        0xDE
1952
1953 /*
1954  * EXT4_DIR_PAD defines the directory entries boundaries
1955  *
1956  * NOTE: It must be a multiple of 4
1957  */
1958 #define EXT4_DIR_PAD                    4
1959 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1960 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1961                                          ~EXT4_DIR_ROUND)
1962 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1963
1964 /*
1965  * If we ever get support for fs block sizes > page_size, we'll need
1966  * to remove the #if statements in the next two functions...
1967  */
1968 static inline unsigned int
1969 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1970 {
1971         unsigned len = le16_to_cpu(dlen);
1972
1973 #if (PAGE_SIZE >= 65536)
1974         if (len == EXT4_MAX_REC_LEN || len == 0)
1975                 return blocksize;
1976         return (len & 65532) | ((len & 3) << 16);
1977 #else
1978         return len;
1979 #endif
1980 }
1981
1982 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1983 {
1984         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1985                 BUG();
1986 #if (PAGE_SIZE >= 65536)
1987         if (len < 65536)
1988                 return cpu_to_le16(len);
1989         if (len == blocksize) {
1990                 if (blocksize == 65536)
1991                         return cpu_to_le16(EXT4_MAX_REC_LEN);
1992                 else
1993                         return cpu_to_le16(0);
1994         }
1995         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1996 #else
1997         return cpu_to_le16(len);
1998 #endif
1999 }
2000
2001 /*
2002  * Hash Tree Directory indexing
2003  * (c) Daniel Phillips, 2001
2004  */
2005
2006 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2007                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2008 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
2009 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2010
2011 /* Legal values for the dx_root hash_version field: */
2012
2013 #define DX_HASH_LEGACY          0
2014 #define DX_HASH_HALF_MD4        1
2015 #define DX_HASH_TEA             2
2016 #define DX_HASH_LEGACY_UNSIGNED 3
2017 #define DX_HASH_HALF_MD4_UNSIGNED       4
2018 #define DX_HASH_TEA_UNSIGNED            5
2019
2020 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2021                               const void *address, unsigned int length)
2022 {
2023         struct {
2024                 struct shash_desc shash;
2025                 char ctx[4];
2026         } desc;
2027         int err;
2028
2029         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2030
2031         desc.shash.tfm = sbi->s_chksum_driver;
2032         desc.shash.flags = 0;
2033         *(u32 *)desc.ctx = crc;
2034
2035         err = crypto_shash_update(&desc.shash, address, length);
2036         BUG_ON(err);
2037
2038         return *(u32 *)desc.ctx;
2039 }
2040
2041 #ifdef __KERNEL__
2042
2043 /* hash info structure used by the directory hash */
2044 struct dx_hash_info
2045 {
2046         u32             hash;
2047         u32             minor_hash;
2048         int             hash_version;
2049         u32             *seed;
2050 };
2051
2052
2053 /* 32 and 64 bit signed EOF for dx directories */
2054 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2055 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2056
2057
2058 /*
2059  * Control parameters used by ext4_htree_next_block
2060  */
2061 #define HASH_NB_ALWAYS          1
2062
2063 struct ext4_filename {
2064         const struct qstr *usr_fname;
2065         struct fscrypt_str disk_name;
2066         struct dx_hash_info hinfo;
2067 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2068         struct fscrypt_str crypto_buf;
2069 #endif
2070 };
2071
2072 #define fname_name(p) ((p)->disk_name.name)
2073 #define fname_len(p)  ((p)->disk_name.len)
2074
2075 /*
2076  * Describe an inode's exact location on disk and in memory
2077  */
2078 struct ext4_iloc
2079 {
2080         struct buffer_head *bh;
2081         unsigned long offset;
2082         ext4_group_t block_group;
2083 };
2084
2085 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2086 {
2087         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2088 }
2089
2090 /*
2091  * This structure is stuffed into the struct file's private_data field
2092  * for directories.  It is where we put information so that we can do
2093  * readdir operations in hash tree order.
2094  */
2095 struct dir_private_info {
2096         struct rb_root  root;
2097         struct rb_node  *curr_node;
2098         struct fname    *extra_fname;
2099         loff_t          last_pos;
2100         __u32           curr_hash;
2101         __u32           curr_minor_hash;
2102         __u32           next_hash;
2103 };
2104
2105 /* calculate the first block number of the group */
2106 static inline ext4_fsblk_t
2107 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2108 {
2109         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2110                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2111 }
2112
2113 /*
2114  * Special error return code only used by dx_probe() and its callers.
2115  */
2116 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2117
2118 /*
2119  * Timeout and state flag for lazy initialization inode thread.
2120  */
2121 #define EXT4_DEF_LI_WAIT_MULT                   10
2122 #define EXT4_DEF_LI_MAX_START_DELAY             5
2123 #define EXT4_LAZYINIT_QUIT                      0x0001
2124 #define EXT4_LAZYINIT_RUNNING                   0x0002
2125
2126 /*
2127  * Lazy inode table initialization info
2128  */
2129 struct ext4_lazy_init {
2130         unsigned long           li_state;
2131         struct list_head        li_request_list;
2132         struct mutex            li_list_mtx;
2133 };
2134
2135 struct ext4_li_request {
2136         struct super_block      *lr_super;
2137         struct ext4_sb_info     *lr_sbi;
2138         ext4_group_t            lr_next_group;
2139         struct list_head        lr_request;
2140         unsigned long           lr_next_sched;
2141         unsigned long           lr_timeout;
2142 };
2143
2144 struct ext4_features {
2145         struct kobject f_kobj;
2146         struct completion f_kobj_unregister;
2147 };
2148
2149 /*
2150  * This structure will be used for multiple mount protection. It will be
2151  * written into the block number saved in the s_mmp_block field in the
2152  * superblock. Programs that check MMP should assume that if
2153  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2154  * to use the filesystem, regardless of how old the timestamp is.
2155  */
2156 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2157 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2158 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2159 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2160
2161 struct mmp_struct {
2162         __le32  mmp_magic;              /* Magic number for MMP */
2163         __le32  mmp_seq;                /* Sequence no. updated periodically */
2164
2165         /*
2166          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2167          * purposes and do not affect the correctness of the algorithm
2168          */
2169         __le64  mmp_time;               /* Time last updated */
2170         char    mmp_nodename[64];       /* Node which last updated MMP block */
2171         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2172
2173         /*
2174          * mmp_check_interval is used to verify if the MMP block has been
2175          * updated on the block device. The value is updated based on the
2176          * maximum time to write the MMP block during an update cycle.
2177          */
2178         __le16  mmp_check_interval;
2179
2180         __le16  mmp_pad1;
2181         __le32  mmp_pad2[226];
2182         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2183 };
2184
2185 /* arguments passed to the mmp thread */
2186 struct mmpd_data {
2187         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2188         struct super_block *sb;  /* super block of the fs */
2189 };
2190
2191 /*
2192  * Check interval multiplier
2193  * The MMP block is written every update interval and initially checked every
2194  * update interval x the multiplier (the value is then adapted based on the
2195  * write latency). The reason is that writes can be delayed under load and we
2196  * don't want readers to incorrectly assume that the filesystem is no longer
2197  * in use.
2198  */
2199 #define EXT4_MMP_CHECK_MULT             2UL
2200
2201 /*
2202  * Minimum interval for MMP checking in seconds.
2203  */
2204 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2205
2206 /*
2207  * Maximum interval for MMP checking in seconds.
2208  */
2209 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2210
2211 /*
2212  * Function prototypes
2213  */
2214
2215 /*
2216  * Ok, these declarations are also in <linux/kernel.h> but none of the
2217  * ext4 source programs needs to include it so they are duplicated here.
2218  */
2219 # define NORET_TYPE     /**/
2220 # define ATTRIB_NORET   __attribute__((noreturn))
2221 # define NORET_AND      noreturn,
2222
2223 /* bitmap.c */
2224 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2225 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2226                                 struct ext4_group_desc *gdp,
2227                                 struct buffer_head *bh, int sz);
2228 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2229                                   struct ext4_group_desc *gdp,
2230                                   struct buffer_head *bh, int sz);
2231 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2232                                 struct ext4_group_desc *gdp,
2233                                 struct buffer_head *bh);
2234 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2235                                   struct ext4_group_desc *gdp,
2236                                   struct buffer_head *bh);
2237
2238 /* balloc.c */
2239 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2240                                          ext4_fsblk_t blocknr,
2241                                          ext4_group_t *blockgrpp,
2242                                          ext4_grpblk_t *offsetp);
2243 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2244                                           ext4_fsblk_t block);
2245
2246 extern unsigned int ext4_block_group(struct super_block *sb,
2247                         ext4_fsblk_t blocknr);
2248 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2249                         ext4_fsblk_t blocknr);
2250 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2251 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2252                         ext4_group_t group);
2253 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2254                                          ext4_fsblk_t goal,
2255                                          unsigned int flags,
2256                                          unsigned long *count,
2257                                          int *errp);
2258 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2259                                     s64 nclusters, unsigned int flags);
2260 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2261 extern void ext4_check_blocks_bitmap(struct super_block *);
2262 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2263                                                     ext4_group_t block_group,
2264                                                     struct buffer_head ** bh);
2265 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2266
2267 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2268                                                 ext4_group_t block_group);
2269 extern int ext4_wait_block_bitmap(struct super_block *sb,
2270                                   ext4_group_t block_group,
2271                                   struct buffer_head *bh);
2272 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2273                                                   ext4_group_t block_group);
2274 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2275                                               ext4_group_t block_group,
2276                                               struct ext4_group_desc *gdp);
2277 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2278
2279 static inline int ext4_sb_has_crypto(struct super_block *sb)
2280 {
2281         return ext4_has_feature_encrypt(sb);
2282 }
2283
2284 static inline bool ext4_encrypted_inode(struct inode *inode)
2285 {
2286         return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
2287 }
2288
2289 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2290 static inline int ext4_fname_setup_filename(struct inode *dir,
2291                         const struct qstr *iname,
2292                         int lookup, struct ext4_filename *fname)
2293 {
2294         struct fscrypt_name name;
2295         int err;
2296
2297         memset(fname, 0, sizeof(struct ext4_filename));
2298
2299         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2300
2301         fname->usr_fname = name.usr_fname;
2302         fname->disk_name = name.disk_name;
2303         fname->hinfo.hash = name.hash;
2304         fname->hinfo.minor_hash = name.minor_hash;
2305         fname->crypto_buf = name.crypto_buf;
2306         return err;
2307 }
2308
2309 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2310 {
2311         struct fscrypt_name name;
2312
2313         name.crypto_buf = fname->crypto_buf;
2314         fscrypt_free_filename(&name);
2315
2316         fname->crypto_buf.name = NULL;
2317         fname->usr_fname = NULL;
2318         fname->disk_name.name = NULL;
2319 }
2320 #else
2321 static inline int ext4_fname_setup_filename(struct inode *dir,
2322                 const struct qstr *iname,
2323                 int lookup, struct ext4_filename *fname)
2324 {
2325         fname->usr_fname = iname;
2326         fname->disk_name.name = (unsigned char *) iname->name;
2327         fname->disk_name.len = iname->len;
2328         return 0;
2329 }
2330 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2331
2332 #define fscrypt_set_d_op(i)
2333 #define fscrypt_get_ctx                 fscrypt_notsupp_get_ctx
2334 #define fscrypt_release_ctx             fscrypt_notsupp_release_ctx
2335 #define fscrypt_encrypt_page            fscrypt_notsupp_encrypt_page
2336 #define fscrypt_decrypt_page            fscrypt_notsupp_decrypt_page
2337 #define fscrypt_decrypt_bio_pages       fscrypt_notsupp_decrypt_bio_pages
2338 #define fscrypt_pullback_bio_page       fscrypt_notsupp_pullback_bio_page
2339 #define fscrypt_restore_control_page    fscrypt_notsupp_restore_control_page
2340 #define fscrypt_zeroout_range           fscrypt_notsupp_zeroout_range
2341 #define fscrypt_process_policy          fscrypt_notsupp_process_policy
2342 #define fscrypt_get_policy              fscrypt_notsupp_get_policy
2343 #define fscrypt_has_permitted_context   fscrypt_notsupp_has_permitted_context
2344 #define fscrypt_inherit_context         fscrypt_notsupp_inherit_context
2345 #define fscrypt_get_encryption_info     fscrypt_notsupp_get_encryption_info
2346 #define fscrypt_put_encryption_info     fscrypt_notsupp_put_encryption_info
2347 #define fscrypt_setup_filename          fscrypt_notsupp_setup_filename
2348 #define fscrypt_free_filename           fscrypt_notsupp_free_filename
2349 #define fscrypt_fname_encrypted_size    fscrypt_notsupp_fname_encrypted_size
2350 #define fscrypt_fname_alloc_buffer      fscrypt_notsupp_fname_alloc_buffer
2351 #define fscrypt_fname_free_buffer       fscrypt_notsupp_fname_free_buffer
2352 #define fscrypt_fname_disk_to_usr       fscrypt_notsupp_fname_disk_to_usr
2353 #define fscrypt_fname_usr_to_disk       fscrypt_notsupp_fname_usr_to_disk
2354 #endif
2355
2356 /* dir.c */
2357 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2358                                   struct file *,
2359                                   struct ext4_dir_entry_2 *,
2360                                   struct buffer_head *, char *, int,
2361                                   unsigned int);
2362 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2363         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2364                                         (de), (bh), (buf), (size), (offset)))
2365 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2366                                 __u32 minor_hash,
2367                                 struct ext4_dir_entry_2 *dirent,
2368                                 struct fscrypt_str *ent_name);
2369 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2370 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2371                              struct buffer_head *bh,
2372                              void *buf, int buf_size,
2373                              struct ext4_filename *fname,
2374                              struct ext4_dir_entry_2 **dest_de);
2375 int ext4_insert_dentry(struct inode *dir,
2376                        struct inode *inode,
2377                        struct ext4_dir_entry_2 *de,
2378                        int buf_size,
2379                        struct ext4_filename *fname);
2380 static inline void ext4_update_dx_flag(struct inode *inode)
2381 {
2382         if (!ext4_has_feature_dir_index(inode->i_sb))
2383                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2384 }
2385 static unsigned char ext4_filetype_table[] = {
2386         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2387 };
2388
2389 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2390 {
2391         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2392                 return DT_UNKNOWN;
2393
2394         return ext4_filetype_table[filetype];
2395 }
2396 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2397                              void *buf, int buf_size);
2398
2399 /* fsync.c */
2400 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2401
2402 /* hash.c */
2403 extern int ext4fs_dirhash(const char *name, int len, struct
2404                           dx_hash_info *hinfo);
2405
2406 /* ialloc.c */
2407 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2408                                       const struct qstr *qstr, __u32 goal,
2409                                       uid_t *owner, int handle_type,
2410                                       unsigned int line_no, int nblocks);
2411
2412 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2413         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2414                          0, 0, 0)
2415 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2416                                     type, nblocks)                  \
2417         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2418                          (type), __LINE__, (nblocks))
2419
2420
2421 extern void ext4_free_inode(handle_t *, struct inode *);
2422 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2423 extern unsigned long ext4_count_free_inodes(struct super_block *);
2424 extern unsigned long ext4_count_dirs(struct super_block *);
2425 extern void ext4_check_inodes_bitmap(struct super_block *);
2426 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2427 extern int ext4_init_inode_table(struct super_block *sb,
2428                                  ext4_group_t group, int barrier);
2429 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2430
2431 /* mballoc.c */
2432 extern const struct file_operations ext4_seq_mb_groups_fops;
2433 extern long ext4_mb_stats;
2434 extern long ext4_mb_max_to_scan;
2435 extern int ext4_mb_init(struct super_block *);
2436 extern int ext4_mb_release(struct super_block *);
2437 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2438                                 struct ext4_allocation_request *, int *);
2439 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2440 extern void ext4_discard_preallocations(struct inode *);
2441 extern int __init ext4_init_mballoc(void);
2442 extern void ext4_exit_mballoc(void);
2443 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2444                              struct buffer_head *bh, ext4_fsblk_t block,
2445                              unsigned long count, int flags);
2446 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2447                                    ext4_group_t ngroups);
2448 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2449                 ext4_group_t i, struct ext4_group_desc *desc);
2450 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2451                                 ext4_fsblk_t block, unsigned long count);
2452 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2453
2454 /* inode.c */
2455 int ext4_inode_is_fast_symlink(struct inode *inode);
2456 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2457 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2458 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2459                              struct buffer_head *bh_result, int create);
2460 int ext4_dax_get_block(struct inode *inode, sector_t iblock,
2461                        struct buffer_head *bh_result, int create);
2462 int ext4_get_block(struct inode *inode, sector_t iblock,
2463                    struct buffer_head *bh_result, int create);
2464 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2465                        struct buffer_head *bh_result, int create);
2466 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2467                            struct buffer_head *bh, int create);
2468 int ext4_walk_page_buffers(handle_t *handle,
2469                            struct buffer_head *head,
2470                            unsigned from,
2471                            unsigned to,
2472                            int *partial,
2473                            int (*fn)(handle_t *handle,
2474                                      struct buffer_head *bh));
2475 int do_journal_get_write_access(handle_t *handle,
2476                                 struct buffer_head *bh);
2477 #define FALL_BACK_TO_NONDELALLOC 1
2478 #define CONVERT_INLINE_DATA      2
2479
2480 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2481 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2482 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2483 extern int  ext4_setattr(struct dentry *, struct iattr *);
2484 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2485                                 struct kstat *stat);
2486 extern void ext4_evict_inode(struct inode *);
2487 extern void ext4_clear_inode(struct inode *);
2488 extern int  ext4_sync_inode(handle_t *, struct inode *);
2489 extern void ext4_dirty_inode(struct inode *, int);
2490 extern int ext4_change_inode_journal_flag(struct inode *, int);
2491 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2492 extern int ext4_inode_attach_jinode(struct inode *inode);
2493 extern int ext4_can_truncate(struct inode *inode);
2494 extern void ext4_truncate(struct inode *);
2495 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2496 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2497 extern void ext4_set_inode_flags(struct inode *);
2498 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2499 extern int ext4_alloc_da_blocks(struct inode *inode);
2500 extern void ext4_set_aops(struct inode *inode);
2501 extern int ext4_writepage_trans_blocks(struct inode *);
2502 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2503 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2504                              loff_t lstart, loff_t lend);
2505 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2506 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
2507 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2508 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2509 extern void ext4_da_update_reserve_space(struct inode *inode,
2510                                         int used, int quota_claim);
2511 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2512                               ext4_fsblk_t pblk, ext4_lblk_t len);
2513 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk,
2514                                 unsigned int map_len,
2515                                 struct extent_status *result);
2516
2517 /* indirect.c */
2518 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2519                                 struct ext4_map_blocks *map, int flags);
2520 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2521 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2522 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2523 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2524                                  ext4_lblk_t start, ext4_lblk_t end);
2525
2526 /* ioctl.c */
2527 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2528 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2529
2530 /* migrate.c */
2531 extern int ext4_ext_migrate(struct inode *);
2532 extern int ext4_ind_migrate(struct inode *inode);
2533
2534 /* namei.c */
2535 extern int ext4_dirent_csum_verify(struct inode *inode,
2536                                    struct ext4_dir_entry *dirent);
2537 extern int ext4_orphan_add(handle_t *, struct inode *);
2538 extern int ext4_orphan_del(handle_t *, struct inode *);
2539 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2540                                 __u32 start_minor_hash, __u32 *next_hash);
2541 extern int ext4_search_dir(struct buffer_head *bh,
2542                            char *search_buf,
2543                            int buf_size,
2544                            struct inode *dir,
2545                            struct ext4_filename *fname,
2546                            const struct qstr *d_name,
2547                            unsigned int offset,
2548                            struct ext4_dir_entry_2 **res_dir);
2549 extern int ext4_generic_delete_entry(handle_t *handle,
2550                                      struct inode *dir,
2551                                      struct ext4_dir_entry_2 *de_del,
2552                                      struct buffer_head *bh,
2553                                      void *entry_buf,
2554                                      int buf_size,
2555                                      int csum_size);
2556 extern bool ext4_empty_dir(struct inode *inode);
2557
2558 /* resize.c */
2559 extern int ext4_group_add(struct super_block *sb,
2560                                 struct ext4_new_group_data *input);
2561 extern int ext4_group_extend(struct super_block *sb,
2562                                 struct ext4_super_block *es,
2563                                 ext4_fsblk_t n_blocks_count);
2564 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2565
2566 /* super.c */
2567 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2568 extern int ext4_calculate_overhead(struct super_block *sb);
2569 extern void ext4_superblock_csum_set(struct super_block *sb);
2570 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2571 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2572 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2573                                     ext4_group_t ngroup);
2574 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2575                                      char nbuf[16]);
2576
2577 extern __printf(4, 5)
2578 void __ext4_error(struct super_block *, const char *, unsigned int,
2579                   const char *, ...);
2580 extern __printf(5, 6)
2581 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2582                       const char *, ...);
2583 extern __printf(5, 6)
2584 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2585                      const char *, ...);
2586 extern void __ext4_std_error(struct super_block *, const char *,
2587                              unsigned int, int);
2588 extern __printf(4, 5)
2589 void __ext4_abort(struct super_block *, const char *, unsigned int,
2590                   const char *, ...);
2591 extern __printf(4, 5)
2592 void __ext4_warning(struct super_block *, const char *, unsigned int,
2593                     const char *, ...);
2594 extern __printf(4, 5)
2595 void __ext4_warning_inode(const struct inode *inode, const char *function,
2596                           unsigned int line, const char *fmt, ...);
2597 extern __printf(3, 4)
2598 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2599 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2600                            const char *, unsigned int, const char *);
2601 extern __printf(7, 8)
2602 void __ext4_grp_locked_error(const char *, unsigned int,
2603                              struct super_block *, ext4_group_t,
2604                              unsigned long, ext4_fsblk_t,
2605                              const char *, ...);
2606
2607 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2608         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2609
2610 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2611         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2612
2613 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2614         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2615
2616 #ifdef CONFIG_PRINTK
2617
2618 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2619         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2620 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2621         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2622 #define ext4_error(sb, fmt, ...)                                        \
2623         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2624 #define ext4_abort(sb, fmt, ...)                                        \
2625         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2626 #define ext4_warning(sb, fmt, ...)                                      \
2627         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2628 #define ext4_warning_inode(inode, fmt, ...)                             \
2629         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2630 #define ext4_msg(sb, level, fmt, ...)                           \
2631         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2632 #define dump_mmp_msg(sb, mmp, msg)                                      \
2633         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2634 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2635         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2636                                 fmt, ##__VA_ARGS__)
2637
2638 #else
2639
2640 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2641 do {                                                                    \
2642         no_printk(fmt, ##__VA_ARGS__);                                  \
2643         __ext4_error_inode(inode, "", 0, block, " ");                   \
2644 } while (0)
2645 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2646 do {                                                                    \
2647         no_printk(fmt, ##__VA_ARGS__);                                  \
2648         __ext4_error_file(file, "", 0, block, " ");                     \
2649 } while (0)
2650 #define ext4_error(sb, fmt, ...)                                        \
2651 do {                                                                    \
2652         no_printk(fmt, ##__VA_ARGS__);                                  \
2653         __ext4_error(sb, "", 0, " ");                                   \
2654 } while (0)
2655 #define ext4_abort(sb, fmt, ...)                                        \
2656 do {                                                                    \
2657         no_printk(fmt, ##__VA_ARGS__);                                  \
2658         __ext4_abort(sb, "", 0, " ");                                   \
2659 } while (0)
2660 #define ext4_warning(sb, fmt, ...)                                      \
2661 do {                                                                    \
2662         no_printk(fmt, ##__VA_ARGS__);                                  \
2663         __ext4_warning(sb, "", 0, " ");                                 \
2664 } while (0)
2665 #define ext4_warning_inode(inode, fmt, ...)                             \
2666 do {                                                                    \
2667         no_printk(fmt, ##__VA_ARGS__);                                  \
2668         __ext4_warning_inode(inode, "", 0, " ");                        \
2669 } while (0)
2670 #define ext4_msg(sb, level, fmt, ...)                                   \
2671 do {                                                                    \
2672         no_printk(fmt, ##__VA_ARGS__);                                  \
2673         __ext4_msg(sb, "", " ");                                        \
2674 } while (0)
2675 #define dump_mmp_msg(sb, mmp, msg)                                      \
2676         __dump_mmp_msg(sb, mmp, "", 0, "")
2677 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2678 do {                                                                    \
2679         no_printk(fmt, ##__VA_ARGS__);                          \
2680         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2681 } while (0)
2682
2683 #endif
2684
2685 extern void ext4_update_dynamic_rev(struct super_block *sb);
2686 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2687                                         __u32 compat);
2688 extern int ext4_update_rocompat_feature(handle_t *handle,
2689                                         struct super_block *sb, __u32 rocompat);
2690 extern int ext4_update_incompat_feature(handle_t *handle,
2691                                         struct super_block *sb, __u32 incompat);
2692 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2693                                       struct ext4_group_desc *bg);
2694 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2695                                       struct ext4_group_desc *bg);
2696 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2697                                      struct ext4_group_desc *bg);
2698 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2699                                       struct ext4_group_desc *bg);
2700 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2701                                  struct ext4_group_desc *bg);
2702 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2703                                 struct ext4_group_desc *bg);
2704 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2705                                    struct ext4_group_desc *bg);
2706 extern void ext4_block_bitmap_set(struct super_block *sb,
2707                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2708 extern void ext4_inode_bitmap_set(struct super_block *sb,
2709                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2710 extern void ext4_inode_table_set(struct super_block *sb,
2711                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2712 extern void ext4_free_group_clusters_set(struct super_block *sb,
2713                                          struct ext4_group_desc *bg,
2714                                          __u32 count);
2715 extern void ext4_free_inodes_set(struct super_block *sb,
2716                                 struct ext4_group_desc *bg, __u32 count);
2717 extern void ext4_used_dirs_set(struct super_block *sb,
2718                                 struct ext4_group_desc *bg, __u32 count);
2719 extern void ext4_itable_unused_set(struct super_block *sb,
2720                                    struct ext4_group_desc *bg, __u32 count);
2721 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2722                                        struct ext4_group_desc *gdp);
2723 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2724                                      struct ext4_group_desc *gdp);
2725 extern int ext4_register_li_request(struct super_block *sb,
2726                                     ext4_group_t first_not_zeroed);
2727
2728 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2729 {
2730         return ext4_has_feature_gdt_csum(sb) ||
2731                EXT4_SB(sb)->s_chksum_driver != NULL;
2732 }
2733
2734 static inline int ext4_has_metadata_csum(struct super_block *sb)
2735 {
2736         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2737                      !EXT4_SB(sb)->s_chksum_driver);
2738
2739         return (EXT4_SB(sb)->s_chksum_driver != NULL);
2740 }
2741 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2742 {
2743         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2744                 le32_to_cpu(es->s_blocks_count_lo);
2745 }
2746
2747 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2748 {
2749         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2750                 le32_to_cpu(es->s_r_blocks_count_lo);
2751 }
2752
2753 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2754 {
2755         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2756                 le32_to_cpu(es->s_free_blocks_count_lo);
2757 }
2758
2759 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2760                                          ext4_fsblk_t blk)
2761 {
2762         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2763         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2764 }
2765
2766 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2767                                               ext4_fsblk_t blk)
2768 {
2769         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2770         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2771 }
2772
2773 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2774                                            ext4_fsblk_t blk)
2775 {
2776         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2777         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2778 }
2779
2780 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2781 {
2782         if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2783                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2784                         le32_to_cpu(raw_inode->i_size_lo);
2785         else
2786                 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2787 }
2788
2789 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2790 {
2791         raw_inode->i_size_lo = cpu_to_le32(i_size);
2792         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2793 }
2794
2795 static inline
2796 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2797                                             ext4_group_t group)
2798 {
2799          struct ext4_group_info ***grp_info;
2800          long indexv, indexh;
2801          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2802          grp_info = EXT4_SB(sb)->s_group_info;
2803          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2804          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2805          return grp_info[indexv][indexh];
2806 }
2807
2808 /*
2809  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2810  * the locking protocol documented in the comments of ext4_group_add()
2811  * in resize.c
2812  */
2813 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2814 {
2815         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2816
2817         smp_rmb();
2818         return ngroups;
2819 }
2820
2821 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2822                                              ext4_group_t block_group)
2823 {
2824         return block_group >> sbi->s_log_groups_per_flex;
2825 }
2826
2827 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2828 {
2829         return 1 << sbi->s_log_groups_per_flex;
2830 }
2831
2832 #define ext4_std_error(sb, errno)                               \
2833 do {                                                            \
2834         if ((errno))                                            \
2835                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2836 } while (0)
2837
2838 #ifdef CONFIG_SMP
2839 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2840  * counters. So we need to make sure we have free clusters more
2841  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2842  */
2843 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2844 #else
2845 #define EXT4_FREECLUSTERS_WATERMARK 0
2846 #endif
2847
2848 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2849 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2850 {
2851         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2852                      !inode_is_locked(inode));
2853         down_write(&EXT4_I(inode)->i_data_sem);
2854         if (newsize > EXT4_I(inode)->i_disksize)
2855                 EXT4_I(inode)->i_disksize = newsize;
2856         up_write(&EXT4_I(inode)->i_data_sem);
2857 }
2858
2859 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2860 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2861 {
2862         int changed = 0;
2863
2864         if (newsize > inode->i_size) {
2865                 i_size_write(inode, newsize);
2866                 changed = 1;
2867         }
2868         if (newsize > EXT4_I(inode)->i_disksize) {
2869                 ext4_update_i_disksize(inode, newsize);
2870                 changed |= 2;
2871         }
2872         return changed;
2873 }
2874
2875 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2876                                       loff_t len);
2877
2878 struct ext4_group_info {
2879         unsigned long   bb_state;
2880         struct rb_root  bb_free_root;
2881         ext4_grpblk_t   bb_first_free;  /* first free block */
2882         ext4_grpblk_t   bb_free;        /* total free blocks */
2883         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2884         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2885         struct          list_head bb_prealloc_list;
2886 #ifdef DOUBLE_CHECK
2887         void            *bb_bitmap;
2888 #endif
2889         struct rw_semaphore alloc_sem;
2890         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2891                                          * regions, index is order.
2892                                          * bb_counters[3] = 5 means
2893                                          * 5 free 8-block regions. */
2894 };
2895
2896 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2897 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2898 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2899 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2900
2901 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2902         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2903 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2904         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2905 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2906         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2907
2908 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2909         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2910 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2911         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2912 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2913         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2914
2915 #define EXT4_MAX_CONTENTION             8
2916 #define EXT4_CONTENTION_THRESHOLD       2
2917
2918 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2919                                               ext4_group_t group)
2920 {
2921         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2922 }
2923
2924 /*
2925  * Returns true if the filesystem is busy enough that attempts to
2926  * access the block group locks has run into contention.
2927  */
2928 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2929 {
2930         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2931 }
2932
2933 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2934 {
2935         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2936         if (spin_trylock(lock))
2937                 /*
2938                  * We're able to grab the lock right away, so drop the
2939                  * lock contention counter.
2940                  */
2941                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2942         else {
2943                 /*
2944                  * The lock is busy, so bump the contention counter,
2945                  * and then wait on the spin lock.
2946                  */
2947                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2948                                   EXT4_MAX_CONTENTION);
2949                 spin_lock(lock);
2950         }
2951 }
2952
2953 static inline void ext4_unlock_group(struct super_block *sb,
2954                                         ext4_group_t group)
2955 {
2956         spin_unlock(ext4_group_lock_ptr(sb, group));
2957 }
2958
2959 /*
2960  * Block validity checking
2961  */
2962 #define ext4_check_indirect_blockref(inode, bh)                         \
2963         ext4_check_blockref(__func__, __LINE__, inode,                  \
2964                             (__le32 *)(bh)->b_data,                     \
2965                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2966
2967 #define ext4_ind_check_inode(inode)                                     \
2968         ext4_check_blockref(__func__, __LINE__, inode,                  \
2969                             EXT4_I(inode)->i_data,                      \
2970                             EXT4_NDIR_BLOCKS)
2971
2972 /*
2973  * Inodes and files operations
2974  */
2975
2976 /* dir.c */
2977 extern const struct file_operations ext4_dir_operations;
2978
2979 /* file.c */
2980 extern const struct inode_operations ext4_file_inode_operations;
2981 extern const struct file_operations ext4_file_operations;
2982 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2983
2984 /* inline.c */
2985 extern int ext4_get_max_inline_size(struct inode *inode);
2986 extern int ext4_find_inline_data_nolock(struct inode *inode);
2987 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2988                                  unsigned int len);
2989 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2990
2991 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2992 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2993                                          struct inode *inode,
2994                                          loff_t pos, unsigned len,
2995                                          unsigned flags,
2996                                          struct page **pagep);
2997 extern int ext4_write_inline_data_end(struct inode *inode,
2998                                       loff_t pos, unsigned len,
2999                                       unsigned copied,
3000                                       struct page *page);
3001 extern struct buffer_head *
3002 ext4_journalled_write_inline_data(struct inode *inode,
3003                                   unsigned len,
3004                                   struct page *page);
3005 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3006                                            struct inode *inode,
3007                                            loff_t pos, unsigned len,
3008                                            unsigned flags,
3009                                            struct page **pagep,
3010                                            void **fsdata);
3011 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3012                                          unsigned len, unsigned copied,
3013                                          struct page *page);
3014 extern int ext4_try_add_inline_entry(handle_t *handle,
3015                                      struct ext4_filename *fname,
3016                                      struct inode *dir, struct inode *inode);
3017 extern int ext4_try_create_inline_dir(handle_t *handle,
3018                                       struct inode *parent,
3019                                       struct inode *inode);
3020 extern int ext4_read_inline_dir(struct file *filp,
3021                                 struct dir_context *ctx,
3022                                 int *has_inline_data);
3023 extern int htree_inlinedir_to_tree(struct file *dir_file,
3024                                    struct inode *dir, ext4_lblk_t block,
3025                                    struct dx_hash_info *hinfo,
3026                                    __u32 start_hash, __u32 start_minor_hash,
3027                                    int *has_inline_data);
3028 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3029                                         struct ext4_filename *fname,
3030                                         const struct qstr *d_name,
3031                                         struct ext4_dir_entry_2 **res_dir,
3032                                         int *has_inline_data);
3033 extern int ext4_delete_inline_entry(handle_t *handle,
3034                                     struct inode *dir,
3035                                     struct ext4_dir_entry_2 *de_del,
3036                                     struct buffer_head *bh,
3037                                     int *has_inline_data);
3038 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3039 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3040                                         struct ext4_dir_entry_2 **parent_de,
3041                                         int *retval);
3042 extern int ext4_inline_data_fiemap(struct inode *inode,
3043                                    struct fiemap_extent_info *fieinfo,
3044                                    int *has_inline, __u64 start, __u64 len);
3045 extern int ext4_try_to_evict_inline_data(handle_t *handle,
3046                                          struct inode *inode,
3047                                          int needed);
3048 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3049
3050 extern int ext4_convert_inline_data(struct inode *inode);
3051
3052 static inline int ext4_has_inline_data(struct inode *inode)
3053 {
3054         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3055                EXT4_I(inode)->i_inline_off;
3056 }
3057
3058 /* namei.c */
3059 extern const struct inode_operations ext4_dir_inode_operations;
3060 extern const struct inode_operations ext4_special_inode_operations;
3061 extern struct dentry *ext4_get_parent(struct dentry *child);
3062 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3063                                  struct ext4_dir_entry_2 *de,
3064                                  int blocksize, int csum_size,
3065                                  unsigned int parent_ino, int dotdot_real_len);
3066 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3067                                    unsigned int blocksize);
3068 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3069                                          struct inode *inode,
3070                                          struct buffer_head *bh);
3071 #define S_SHIFT 12
3072 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3073         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3074         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3075         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3076         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3077         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3078         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3079         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3080 };
3081
3082 static inline void ext4_set_de_type(struct super_block *sb,
3083                                 struct ext4_dir_entry_2 *de,
3084                                 umode_t mode) {
3085         if (ext4_has_feature_filetype(sb))
3086                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3087 }
3088
3089 /* readpages.c */
3090 extern int ext4_mpage_readpages(struct address_space *mapping,
3091                                 struct list_head *pages, struct page *page,
3092                                 unsigned nr_pages);
3093
3094 /* symlink.c */
3095 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3096 extern const struct inode_operations ext4_symlink_inode_operations;
3097 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3098
3099 /* sysfs.c */
3100 extern int ext4_register_sysfs(struct super_block *sb);
3101 extern void ext4_unregister_sysfs(struct super_block *sb);
3102 extern int __init ext4_init_sysfs(void);
3103 extern void ext4_exit_sysfs(void);
3104
3105 /* block_validity */
3106 extern void ext4_release_system_zone(struct super_block *sb);
3107 extern int ext4_setup_system_zone(struct super_block *sb);
3108 extern int __init ext4_init_system_zone(void);
3109 extern void ext4_exit_system_zone(void);
3110 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3111                                  ext4_fsblk_t start_blk,
3112                                  unsigned int count);
3113 extern int ext4_check_blockref(const char *, unsigned int,
3114                                struct inode *, __le32 *, unsigned int);
3115
3116 /* extents.c */
3117 struct ext4_ext_path;
3118 struct ext4_extent;
3119
3120 /*
3121  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3122  * __le32.
3123  */
3124 #define EXT_MAX_BLOCKS  0xffffffff
3125
3126 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3127 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3128 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3129 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3130                                struct ext4_map_blocks *map, int flags);
3131 extern void ext4_ext_truncate(handle_t *, struct inode *);
3132 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3133                                  ext4_lblk_t end);
3134 extern void ext4_ext_init(struct super_block *);
3135 extern void ext4_ext_release(struct super_block *);
3136 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3137                           loff_t len);
3138 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3139                                           loff_t offset, ssize_t len);
3140 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3141                            struct ext4_map_blocks *map, int flags);
3142 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3143                                          ext4_lblk_t lblocks);
3144 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3145                                                    int num,
3146                                                    struct ext4_ext_path *path);
3147 extern int ext4_can_extents_be_merged(struct inode *inode,
3148                                       struct ext4_extent *ex1,
3149                                       struct ext4_extent *ex2);
3150 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3151                                   struct ext4_ext_path **,
3152                                   struct ext4_extent *, int);
3153 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3154                                               struct ext4_ext_path **,
3155                                               int flags);
3156 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3157 extern int ext4_ext_check_inode(struct inode *inode);
3158 extern int ext4_find_delalloc_range(struct inode *inode,
3159                                     ext4_lblk_t lblk_start,
3160                                     ext4_lblk_t lblk_end);
3161 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3162 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3163 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3164                         __u64 start, __u64 len);
3165 extern int ext4_ext_precache(struct inode *inode);
3166 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3167 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3168 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3169                                 struct inode *inode2, ext4_lblk_t lblk1,
3170                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3171                              int mark_unwritten,int *err);
3172
3173 /* move_extent.c */
3174 extern void ext4_double_down_write_data_sem(struct inode *first,
3175                                             struct inode *second);
3176 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3177                                           struct inode *donor_inode);
3178 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3179                              __u64 start_orig, __u64 start_donor,
3180                              __u64 len, __u64 *moved_len);
3181
3182 /* page-io.c */
3183 extern int __init ext4_init_pageio(void);
3184 extern void ext4_exit_pageio(void);
3185 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3186 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3187 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3188 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3189 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3190                                 struct writeback_control *wbc);
3191 extern void ext4_end_io_rsv_work(struct work_struct *work);
3192 extern void ext4_io_submit(struct ext4_io_submit *io);
3193 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3194                                struct page *page,
3195                                int len,
3196                                struct writeback_control *wbc,
3197                                bool keep_towrite);
3198
3199 /* mmp.c */
3200 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3201
3202 /*
3203  * Add new method to test whether block and inode bitmaps are properly
3204  * initialized. With uninit_bg reading the block from disk is not enough
3205  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3206  */
3207 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3208
3209 static inline int bitmap_uptodate(struct buffer_head *bh)
3210 {
3211         return (buffer_uptodate(bh) &&
3212                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3213 }
3214 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3215 {
3216         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3217 }
3218
3219 /*
3220  * Disable DIO read nolock optimization, so new dioreaders will be forced
3221  * to grab i_mutex
3222  */
3223 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3224 {
3225         ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3226         smp_mb();
3227 }
3228 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3229 {
3230         smp_mb();
3231         ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3232 }
3233
3234 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3235
3236 /* For ioend & aio unwritten conversion wait queues */
3237 #define EXT4_WQ_HASH_SZ         37
3238 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3239                                             EXT4_WQ_HASH_SZ])
3240 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3241
3242 #define EXT4_RESIZING   0
3243 extern int ext4_resize_begin(struct super_block *sb);
3244 extern void ext4_resize_end(struct super_block *sb);
3245
3246 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3247                                               struct ext4_io_end *io_end)
3248 {
3249         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3250                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3251                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3252         }
3253 }
3254
3255 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3256 {
3257         struct inode *inode = io_end->inode;
3258
3259         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3260                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3261                 /* Wake up anyone waiting on unwritten extent conversion */
3262                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3263                         wake_up_all(ext4_ioend_wq(inode));
3264         }
3265 }
3266
3267 static inline bool ext4_aligned_io(struct inode *inode, loff_t off, loff_t len)
3268 {
3269         int blksize = 1 << inode->i_blkbits;
3270
3271         return IS_ALIGNED(off, blksize) && IS_ALIGNED(len, blksize);
3272 }
3273
3274 #endif  /* __KERNEL__ */
3275
3276 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3277 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3278
3279 #endif  /* _EXT4_H */