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   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/wait.h>
  30 #include <linux/blockgroup_lock.h>
  31 #include <linux/percpu_counter.h>
  32
  33 /*
  34  * The fourth extended filesystem constants/structures
  35  */
  36
  37 /*
  38  * Define EXT4FS_DEBUG to produce debug messages
  39  */
  40 #undef EXT4FS_DEBUG
  41
  42 /*
  43  * Debug code
  44  */
  45 #ifdef EXT4FS_DEBUG
  46 #define ext4_debug(f, a...)                                             \
  47         do {                                                            \
  48                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  49                         __FILE__, __LINE__, __func__);                  \
  50                 printk(KERN_DEBUG f, ## a);                             \
  51         } while (0)
  52 #else
  53 #define ext4_debug(f, a...)     do {} while (0)
  54 #endif
  55
  56 /* data type for block offset of block group */
  57 typedef int ext4_grpblk_t;
  58
  59 /* data type for filesystem-wide blocks number */
  60 typedef unsigned long long ext4_fsblk_t;
  61
  62 /* data type for file logical block number */
  63 typedef __u32 ext4_lblk_t;
  64
  65 /* data type for block group number */
  66 typedef unsigned int ext4_group_t;
  67
  68
  69 /* prefer goal again. length */
  70 #define EXT4_MB_HINT_MERGE              1
  71 /* blocks already reserved */
  72 #define EXT4_MB_HINT_RESERVED           2
  73 /* metadata is being allocated */
  74 #define EXT4_MB_HINT_METADATA           4
  75 /* first blocks in the file */
  76 #define EXT4_MB_HINT_FIRST              8
  77 /* search for the best chunk */
  78 #define EXT4_MB_HINT_BEST               16
  79 /* data is being allocated */
  80 #define EXT4_MB_HINT_DATA               32
  81 /* don't preallocate (for tails) */
  82 #define EXT4_MB_HINT_NOPREALLOC         64
  83 /* allocate for locality group */
  84 #define EXT4_MB_HINT_GROUP_ALLOC        128
  85 /* allocate goal blocks or none */
  86 #define EXT4_MB_HINT_GOAL_ONLY          256
  87 /* goal is meaningful */
  88 #define EXT4_MB_HINT_TRY_GOAL           512
  89 /* blocks already pre-reserved by delayed allocation */
  90 #define EXT4_MB_DELALLOC_RESERVED      1024
  91
  92
  93 struct ext4_allocation_request {
  94         /* target inode for block we're allocating */
  95         struct inode *inode;
  96         /* logical block in target inode */
  97         ext4_lblk_t logical;
  98         /* phys. target (a hint) */
  99         ext4_fsblk_t goal;
 100         /* the closest logical allocated block to the left */
 101         ext4_lblk_t lleft;
 102         /* phys. block for ^^^ */
 103         ext4_fsblk_t pleft;
 104         /* the closest logical allocated block to the right */
 105         ext4_lblk_t lright;
 106         /* phys. block for ^^^ */
 107         ext4_fsblk_t pright;
 108         /* how many blocks we want to allocate */
 109         unsigned int len;
 110         /* flags. see above EXT4_MB_HINT_* */
 111         unsigned int flags;
 112 };
 113
 114 /*
 115  * Special inodes numbers
 116  */
 117 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 118 #define EXT4_ROOT_INO            2      /* Root inode */
 119 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 120 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 121 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 122 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 123
 124 /* First non-reserved inode for old ext4 filesystems */
 125 #define EXT4_GOOD_OLD_FIRST_INO 11
 126
 127 /*
 128  * Maximal count of links to a file
 129  */
 130 #define EXT4_LINK_MAX           65000
 131
 132 /*
 133  * Macro-instructions used to manage several block sizes
 134  */
 135 #define EXT4_MIN_BLOCK_SIZE             1024
 136 #define EXT4_MAX_BLOCK_SIZE             65536
 137 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 138 #ifdef __KERNEL__
 139 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 140 #else
 141 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 142 #endif
 143 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 144 #ifdef __KERNEL__
 145 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 146 #else
 147 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 148 #endif
 149 #ifdef __KERNEL__
 150 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 151 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 152 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 153 #else
 154 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 155                                  EXT4_GOOD_OLD_INODE_SIZE : \
 156                                  (s)->s_inode_size)
 157 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 158                                  EXT4_GOOD_OLD_FIRST_INO : \
 159                                  (s)->s_first_ino)
 160 #endif
 161 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 162
 163 /*
 164  * Structure of a blocks group descriptor
 165  */
 166 struct ext4_group_desc
 167 {
 168         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 169         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 170         __le32  bg_inode_table_lo;      /* Inodes table block */
 171         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 172         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 173         __le16  bg_used_dirs_count_lo;  /* Directories count */
 174         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 175         __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */
 176         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 177         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 178         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 179         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 180         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 181         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 182         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 183         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 184         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 185         __u32   bg_reserved2[3];
 186 };
 187
 188 /*
 189  * Structure of a flex block group info
 190  */
 191
 192 struct flex_groups {
 193         atomic_t free_inodes;
 194         atomic_t free_blocks;
 195         atomic_t used_dirs;
 196 };
 197
 198 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 199 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 200 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 201
 202 /*
 203  * Macro-instructions used to manage group descriptors
 204  */
 205 #define EXT4_MIN_DESC_SIZE              32
 206 #define EXT4_MIN_DESC_SIZE_64BIT        64
 207 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 208 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 209 #ifdef __KERNEL__
 210 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 211 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 212 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 213 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 214 #else
 215 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 216 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 217 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 218 #endif
 219
 220 /*
 221  * Constants relative to the data blocks
 222  */
 223 #define EXT4_NDIR_BLOCKS                12
 224 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 225 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 226 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 227 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 228
 229 /*
 230  * Inode flags
 231  */
 232 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 233 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 234 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 235 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 236 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 237 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 238 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 239 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 240 /* Reserved for compression usage... */
 241 #define EXT4_DIRTY_FL                   0x00000100
 242 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 243 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 244 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 245 /* End compression flags --- maybe not all used */
 246 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 247 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 248 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 249 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 250 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 251 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 252 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 253 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 254 #define EXT4_EXT_MIGRATE                0x00100000 /* Inode is migrating */
 255 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 256
 257 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 258 #define EXT4_FL_USER_MODIFIABLE         0x000B80FF /* User modifiable flags */
 259
 260 /* Flags that should be inherited by new inodes from their parent. */
 261 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 262                            EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
 263                            EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 264                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 265                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
 266
 267 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 268 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 269
 270 /* Flags that are appropriate for non-directories/regular files. */
 271 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 272
 273 /* Mask out flags that are inappropriate for the given type of inode. */
 274 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 275 {
 276         if (S_ISDIR(mode))
 277                 return flags;
 278         else if (S_ISREG(mode))
 279                 return flags & EXT4_REG_FLMASK;
 280         else
 281                 return flags & EXT4_OTHER_FLMASK;
 282 }
 283
 284 /*
 285  * Inode dynamic state flags
 286  */
 287 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 288 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 289 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 290 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 291 #define EXT4_STATE_DA_ALLOC_CLOSE       0x00000010 /* Alloc DA blks on close */
 292
 293 /* Used to pass group descriptor data when online resize is done */
 294 struct ext4_new_group_input {
 295         __u32 group;            /* Group number for this data */
 296         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 297         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 298         __u64 inode_table;      /* Absolute block number of inode table start */
 299         __u32 blocks_count;     /* Total number of blocks in this group */
 300         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 301         __u16 unused;
 302 };
 303
 304 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 305 struct ext4_new_group_data {
 306         __u32 group;
 307         __u64 block_bitmap;
 308         __u64 inode_bitmap;
 309         __u64 inode_table;
 310         __u32 blocks_count;
 311         __u16 reserved_blocks;
 312         __u16 unused;
 313         __u32 free_blocks_count;
 314 };
 315
 316 /*
 317  * Following is used by preallocation code to tell get_blocks() that we
 318  * want uninitialzed extents.
 319  */
 320 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 321
 322 /*
 323  * ioctl commands
 324  */
 325 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 326 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 327 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 328 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 329 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 330 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 331 #ifdef CONFIG_JBD2_DEBUG
 332 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 333 #endif
 334 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 335 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 336 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 337 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 338 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 339  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 340  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 341 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 342
 343 /*
 344  * ioctl commands in 32 bit emulation
 345  */
 346 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 347 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 348 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 349 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 350 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 351 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 352 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 353 #ifdef CONFIG_JBD2_DEBUG
 354 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 355 #endif
 356 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 357 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 358
 359
 360 /*
 361  *  Mount options
 362  */
 363 struct ext4_mount_options {
 364         unsigned long s_mount_opt;
 365         uid_t s_resuid;
 366         gid_t s_resgid;
 367         unsigned long s_commit_interval;
 368         u32 s_min_batch_time, s_max_batch_time;
 369 #ifdef CONFIG_QUOTA
 370         int s_jquota_fmt;
 371         char *s_qf_names[MAXQUOTAS];
 372 #endif
 373 };
 374
 375 /*
 376  * Structure of an inode on the disk
 377  */
 378 struct ext4_inode {
 379         __le16  i_mode;         /* File mode */
 380         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 381         __le32  i_size_lo;      /* Size in bytes */
 382         __le32  i_atime;        /* Access time */
 383         __le32  i_ctime;        /* Inode Change time */
 384         __le32  i_mtime;        /* Modification time */
 385         __le32  i_dtime;        /* Deletion Time */
 386         __le16  i_gid;          /* Low 16 bits of Group Id */
 387         __le16  i_links_count;  /* Links count */
 388         __le32  i_blocks_lo;    /* Blocks count */
 389         __le32  i_flags;        /* File flags */
 390         union {
 391                 struct {
 392                         __le32  l_i_version;
 393                 } linux1;
 394                 struct {
 395                         __u32  h_i_translator;
 396                 } hurd1;
 397                 struct {
 398                         __u32  m_i_reserved1;
 399                 } masix1;
 400         } osd1;                         /* OS dependent 1 */
 401         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 402         __le32  i_generation;   /* File version (for NFS) */
 403         __le32  i_file_acl_lo;  /* File ACL */
 404         __le32  i_size_high;
 405         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 406         union {
 407                 struct {
 408                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 409                         __le16  l_i_file_acl_high;
 410                         __le16  l_i_uid_high;   /* these 2 fields */
 411                         __le16  l_i_gid_high;   /* were reserved2[0] */
 412                         __u32   l_i_reserved2;
 413                 } linux2;
 414                 struct {
 415                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 416                         __u16   h_i_mode_high;
 417                         __u16   h_i_uid_high;
 418                         __u16   h_i_gid_high;
 419                         __u32   h_i_author;
 420                 } hurd2;
 421                 struct {
 422                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 423                         __le16  m_i_file_acl_high;
 424                         __u32   m_i_reserved2[2];
 425                 } masix2;
 426         } osd2;                         /* OS dependent 2 */
 427         __le16  i_extra_isize;
 428         __le16  i_pad1;
 429         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 430         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 431         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 432         __le32  i_crtime;       /* File Creation time */
 433         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 434         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 435 };
 436
 437
 438 #define EXT4_EPOCH_BITS 2
 439 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 440 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 441
 442 /*
 443  * Extended fields will fit into an inode if the filesystem was formatted
 444  * with large inodes (-I 256 or larger) and there are not currently any EAs
 445  * consuming all of the available space. For new inodes we always reserve
 446  * enough space for the kernel's known extended fields, but for inodes
 447  * created with an old kernel this might not have been the case. None of
 448  * the extended inode fields is critical for correct filesystem operation.
 449  * This macro checks if a certain field fits in the inode. Note that
 450  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 451  */
 452 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 453         ((offsetof(typeof(*ext4_inode), field) +        \
 454           sizeof((ext4_inode)->field))                  \
 455         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 456             (einode)->i_extra_isize))                   \
 457
 458 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 459 {
 460        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 461                            time->tv_sec >> 32 : 0) |
 462                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 463 }
 464
 465 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 466 {
 467        if (sizeof(time->tv_sec) > 4)
 468                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 469                                << 32;
 470        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 471 }
 472
 473 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 474 do {                                                                           \
 475         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 476         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 477                 (raw_inode)->xtime ## _extra =                                 \
 478                                 ext4_encode_extra_time(&(inode)->xtime);       \
 479 } while (0)
 480
 481 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 482 do {                                                                           \
 483         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 484                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 485         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 486                 (raw_inode)->xtime ## _extra =                                 \
 487                                 ext4_encode_extra_time(&(einode)->xtime);      \
 488 } while (0)
 489
 490 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 491 do {                                                                           \
 492         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 493         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 494                 ext4_decode_extra_time(&(inode)->xtime,                        \
 495                                        raw_inode->xtime ## _extra);            \
 496 } while (0)
 497
 498 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 499 do {                                                                           \
 500         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 501                 (einode)->xtime.tv_sec =                                       \
 502                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 503         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 504                 ext4_decode_extra_time(&(einode)->xtime,                       \
 505                                        raw_inode->xtime ## _extra);            \
 506 } while (0)
 507
 508 #define i_disk_version osd1.linux1.l_i_version
 509
 510 #if defined(__KERNEL__) || defined(__linux__)
 511 #define i_reserved1     osd1.linux1.l_i_reserved1
 512 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 513 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 514 #define i_uid_low       i_uid
 515 #define i_gid_low       i_gid
 516 #define i_uid_high      osd2.linux2.l_i_uid_high
 517 #define i_gid_high      osd2.linux2.l_i_gid_high
 518 #define i_reserved2     osd2.linux2.l_i_reserved2
 519
 520 #elif defined(__GNU__)
 521
 522 #define i_translator    osd1.hurd1.h_i_translator
 523 #define i_uid_high      osd2.hurd2.h_i_uid_high
 524 #define i_gid_high      osd2.hurd2.h_i_gid_high
 525 #define i_author        osd2.hurd2.h_i_author
 526
 527 #elif defined(__masix__)
 528
 529 #define i_reserved1     osd1.masix1.m_i_reserved1
 530 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 531 #define i_reserved2     osd2.masix2.m_i_reserved2
 532
 533 #endif /* defined(__KERNEL__) || defined(__linux__) */
 534
 535 /*
 536  * storage for cached extent
 537  */
 538 struct ext4_ext_cache {
 539         ext4_fsblk_t    ec_start;
 540         ext4_lblk_t     ec_block;
 541         __u32           ec_len; /* must be 32bit to return holes */
 542         __u32           ec_type;
 543 };
 544
 545 /*
 546  * fourth extended file system inode data in memory
 547  */
 548 struct ext4_inode_info {
 549         __le32  i_data[15];     /* unconverted */
 550         __u32   i_flags;
 551         ext4_fsblk_t    i_file_acl;
 552         __u32   i_dtime;
 553
 554         /*
 555          * i_block_group is the number of the block group which contains
 556          * this file's inode.  Constant across the lifetime of the inode,
 557          * it is ued for making block allocation decisions - we try to
 558          * place a file's data blocks near its inode block, and new inodes
 559          * near to their parent directory's inode.
 560          */
 561         ext4_group_t    i_block_group;
 562         __u32   i_state;                /* Dynamic state flags for ext4 */
 563
 564         ext4_lblk_t             i_dir_start_lookup;
 565 #ifdef CONFIG_EXT4_FS_XATTR
 566         /*
 567          * Extended attributes can be read independently of the main file
 568          * data. Taking i_mutex even when reading would cause contention
 569          * between readers of EAs and writers of regular file data, so
 570          * instead we synchronize on xattr_sem when reading or changing
 571          * EAs.
 572          */
 573         struct rw_semaphore xattr_sem;
 574 #endif
 575 #ifdef CONFIG_EXT4_FS_POSIX_ACL
 576         struct posix_acl        *i_acl;
 577         struct posix_acl        *i_default_acl;
 578 #endif
 579
 580         struct list_head i_orphan;      /* unlinked but open inodes */
 581
 582         /*
 583          * i_disksize keeps track of what the inode size is ON DISK, not
 584          * in memory.  During truncate, i_size is set to the new size by
 585          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 586          * set i_disksize to 0 until the truncate is actually under way.
 587          *
 588          * The intent is that i_disksize always represents the blocks which
 589          * are used by this file.  This allows recovery to restart truncate
 590          * on orphans if we crash during truncate.  We actually write i_disksize
 591          * into the on-disk inode when writing inodes out, instead of i_size.
 592          *
 593          * The only time when i_disksize and i_size may be different is when
 594          * a truncate is in progress.  The only things which change i_disksize
 595          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 596          */
 597         loff_t  i_disksize;
 598
 599         /*
 600          * i_data_sem is for serialising ext4_truncate() against
 601          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 602          * data tree are chopped off during truncate. We can't do that in
 603          * ext4 because whenever we perform intermediate commits during
 604          * truncate, the inode and all the metadata blocks *must* be in a
 605          * consistent state which allows truncation of the orphans to restart
 606          * during recovery.  Hence we must fix the get_block-vs-truncate race
 607          * by other means, so we have i_data_sem.
 608          */
 609         struct rw_semaphore i_data_sem;
 610         struct inode vfs_inode;
 611         struct jbd2_inode jinode;
 612
 613         struct ext4_ext_cache i_cached_extent;
 614         /*
 615          * File creation time. Its function is same as that of
 616          * struct timespec i_{a,c,m}time in the generic inode.
 617          */
 618         struct timespec i_crtime;
 619
 620         /* mballoc */
 621         struct list_head i_prealloc_list;
 622         spinlock_t i_prealloc_lock;
 623
 624         /* ialloc */
 625         ext4_group_t    i_last_alloc_group;
 626
 627         /* allocation reservation info for delalloc */
 628         unsigned int i_reserved_data_blocks;
 629         unsigned int i_reserved_meta_blocks;
 630         unsigned int i_allocated_meta_blocks;
 631         unsigned short i_delalloc_reserved_flag;
 632
 633         /* on-disk additional length */
 634         __u16 i_extra_isize;
 635
 636         spinlock_t i_block_reservation_lock;
 637 };
 638
 639 /*
 640  * File system states
 641  */
 642 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 643 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 644 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 645
 646 /*
 647  * Misc. filesystem flags
 648  */
 649 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 650 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 651 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 652
 653 /*
 654  * Mount flags
 655  */
 656 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 657 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 658 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 659 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 660 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 661 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 662 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 663 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 664 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 665 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 666 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 667 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 668 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 669 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 670 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 671 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 672 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 673 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
 674 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 675 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 676 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 677 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 678 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 679 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
 680 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 681 #define EXT4_MOUNT_I_VERSION            0x2000000 /* i_version support */
 682 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
 683 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
 684
 685 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 686 #ifndef _LINUX_EXT2_FS_H
 687 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 688 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 689 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 690                                          EXT4_MOUNT_##opt)
 691 #else
 692 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 693 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 694 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 695 #endif
 696
 697 #define ext4_set_bit                    ext2_set_bit
 698 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 699 #define ext4_clear_bit                  ext2_clear_bit
 700 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 701 #define ext4_test_bit                   ext2_test_bit
 702 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 703 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 704 #define ext4_find_next_bit              ext2_find_next_bit
 705
 706 /*
 707  * Maximal mount counts between two filesystem checks
 708  */
 709 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 710 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 711
 712 /*
 713  * Behaviour when detecting errors
 714  */
 715 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 716 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 717 #define EXT4_ERRORS_PANIC               3       /* Panic */
 718 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 719
 720 /*
 721  * Structure of the super block
 722  */
 723 struct ext4_super_block {
 724 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 725         __le32  s_blocks_count_lo;      /* Blocks count */
 726         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
 727         __le32  s_free_blocks_count_lo; /* Free blocks count */
 728 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 729         __le32  s_first_data_block;     /* First Data Block */
 730         __le32  s_log_block_size;       /* Block size */
 731         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 732 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 733         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 734         __le32  s_inodes_per_group;     /* # Inodes per group */
 735         __le32  s_mtime;                /* Mount time */
 736 /*30*/  __le32  s_wtime;                /* Write time */
 737         __le16  s_mnt_count;            /* Mount count */
 738         __le16  s_max_mnt_count;        /* Maximal mount count */
 739         __le16  s_magic;                /* Magic signature */
 740         __le16  s_state;                /* File system state */
 741         __le16  s_errors;               /* Behaviour when detecting errors */
 742         __le16  s_minor_rev_level;      /* minor revision level */
 743 /*40*/  __le32  s_lastcheck;            /* time of last check */
 744         __le32  s_checkinterval;        /* max. time between checks */
 745         __le32  s_creator_os;           /* OS */
 746         __le32  s_rev_level;            /* Revision level */
 747 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 748         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 749         /*
 750          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 751          *
 752          * Note: the difference between the compatible feature set and
 753          * the incompatible feature set is that if there is a bit set
 754          * in the incompatible feature set that the kernel doesn't
 755          * know about, it should refuse to mount the filesystem.
 756          *
 757          * e2fsck's requirements are more strict; if it doesn't know
 758          * about a feature in either the compatible or incompatible
 759          * feature set, it must abort and not try to meddle with
 760          * things it doesn't understand...
 761          */
 762         __le32  s_first_ino;            /* First non-reserved inode */
 763         __le16  s_inode_size;           /* size of inode structure */
 764         __le16  s_block_group_nr;       /* block group # of this superblock */
 765         __le32  s_feature_compat;       /* compatible feature set */
 766 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 767         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 768 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 769 /*78*/  char    s_volume_name[16];      /* volume name */
 770 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 771 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 772         /*
 773          * Performance hints.  Directory preallocation should only
 774          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 775          */
 776         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 777         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 778         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 779         /*
 780          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 781          */
 782 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 783 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 784         __le32  s_journal_dev;          /* device number of journal file */
 785         __le32  s_last_orphan;          /* start of list of inodes to delete */
 786         __le32  s_hash_seed[4];         /* HTREE hash seed */
 787         __u8    s_def_hash_version;     /* Default hash version to use */
 788         __u8    s_reserved_char_pad;
 789         __le16  s_desc_size;            /* size of group descriptor */
 790 /*100*/ __le32  s_default_mount_opts;
 791         __le32  s_first_meta_bg;        /* First metablock block group */
 792         __le32  s_mkfs_time;            /* When the filesystem was created */
 793         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 794         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 795 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 796         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 797         __le32  s_free_blocks_count_hi; /* Free blocks count */
 798         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
 799         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
 800         __le32  s_flags;                /* Miscellaneous flags */
 801         __le16  s_raid_stride;          /* RAID stride */
 802         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
 803         __le64  s_mmp_block;            /* Block for multi-mount protection */
 804         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 805         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
 806         __u8    s_reserved_char_pad2;
 807         __le16  s_reserved_pad;
 808         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
 809         __u32   s_reserved[160];        /* Padding to the end of the block */
 810 };
 811
 812 #ifdef __KERNEL__
 813 /*
 814  * fourth extended-fs super-block data in memory
 815  */
 816 struct ext4_sb_info {
 817         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
 818         unsigned long s_inodes_per_block;/* Number of inodes per block */
 819         unsigned long s_blocks_per_group;/* Number of blocks in a group */
 820         unsigned long s_inodes_per_group;/* Number of inodes in a group */
 821         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
 822         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
 823         unsigned long s_desc_per_block; /* Number of group descriptors per block */
 824         ext4_group_t s_groups_count;    /* Number of groups in the fs */
 825         unsigned long s_overhead_last;  /* Last calculated overhead */
 826         unsigned long s_blocks_last;    /* Last seen block count */
 827         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
 828         struct buffer_head * s_sbh;     /* Buffer containing the super block */
 829         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
 830         struct buffer_head **s_group_desc;
 831         unsigned long  s_mount_opt;
 832         ext4_fsblk_t s_sb_block;
 833         uid_t s_resuid;
 834         gid_t s_resgid;
 835         unsigned short s_mount_state;
 836         unsigned short s_pad;
 837         int s_addr_per_block_bits;
 838         int s_desc_per_block_bits;
 839         int s_inode_size;
 840         int s_first_ino;
 841         unsigned int s_inode_readahead_blks;
 842         spinlock_t s_next_gen_lock;
 843         u32 s_next_generation;
 844         u32 s_hash_seed[4];
 845         int s_def_hash_version;
 846         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
 847         struct percpu_counter s_freeblocks_counter;
 848         struct percpu_counter s_freeinodes_counter;
 849         struct percpu_counter s_dirs_counter;
 850         struct percpu_counter s_dirtyblocks_counter;
 851         struct blockgroup_lock *s_blockgroup_lock;
 852         struct proc_dir_entry *s_proc;
 853         struct kobject s_kobj;
 854         struct completion s_kobj_unregister;
 855
 856         /* Journaling */
 857         struct inode *s_journal_inode;
 858         struct journal_s *s_journal;
 859         struct list_head s_orphan;
 860         struct mutex s_orphan_lock;
 861         struct mutex s_resize_lock;
 862         unsigned long s_commit_interval;
 863         u32 s_max_batch_time;
 864         u32 s_min_batch_time;
 865         struct block_device *journal_bdev;
 866 #ifdef CONFIG_JBD2_DEBUG
 867         struct timer_list turn_ro_timer;        /* For turning read-only (crash simulation) */
 868         wait_queue_head_t ro_wait_queue;        /* For people waiting for the fs to go read-only */
 869 #endif
 870 #ifdef CONFIG_QUOTA
 871         char *s_qf_names[MAXQUOTAS];            /* Names of quota files with journalled quota */
 872         int s_jquota_fmt;                       /* Format of quota to use */
 873 #endif
 874         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
 875
 876 #ifdef EXTENTS_STATS
 877         /* ext4 extents stats */
 878         unsigned long s_ext_min;
 879         unsigned long s_ext_max;
 880         unsigned long s_depth_max;
 881         spinlock_t s_ext_stats_lock;
 882         unsigned long s_ext_blocks;
 883         unsigned long s_ext_extents;
 884 #endif
 885
 886         /* for buddy allocator */
 887         struct ext4_group_info ***s_group_info;
 888         struct inode *s_buddy_cache;
 889         long s_blocks_reserved;
 890         spinlock_t s_reserve_lock;
 891         spinlock_t s_md_lock;
 892         tid_t s_last_transaction;
 893         unsigned short *s_mb_offsets;
 894         unsigned int *s_mb_maxs;
 895
 896         /* tunables */
 897         unsigned long s_stripe;
 898         unsigned int s_mb_stream_request;
 899         unsigned int s_mb_max_to_scan;
 900         unsigned int s_mb_min_to_scan;
 901         unsigned int s_mb_stats;
 902         unsigned int s_mb_order2_reqs;
 903         unsigned int s_mb_group_prealloc;
 904         /* where last allocation was done - for stream allocation */
 905         unsigned long s_mb_last_group;
 906         unsigned long s_mb_last_start;
 907
 908         /* history to debug policy */
 909         struct ext4_mb_history *s_mb_history;
 910         int s_mb_history_cur;
 911         int s_mb_history_max;
 912         int s_mb_history_num;
 913         spinlock_t s_mb_history_lock;
 914         int s_mb_history_filter;
 915
 916         /* stats for buddy allocator */
 917         spinlock_t s_mb_pa_lock;
 918         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
 919         atomic_t s_bal_success; /* we found long enough chunks */
 920         atomic_t s_bal_allocated;       /* in blocks */
 921         atomic_t s_bal_ex_scanned;      /* total extents scanned */
 922         atomic_t s_bal_goals;   /* goal hits */
 923         atomic_t s_bal_breaks;  /* too long searches */
 924         atomic_t s_bal_2orders; /* 2^order hits */
 925         spinlock_t s_bal_lock;
 926         unsigned long s_mb_buddies_generated;
 927         unsigned long long s_mb_generation_time;
 928         atomic_t s_mb_lost_chunks;
 929         atomic_t s_mb_preallocated;
 930         atomic_t s_mb_discarded;
 931
 932         /* locality groups */
 933         struct ext4_locality_group *s_locality_groups;
 934
 935         /* for write statistics */
 936         unsigned long s_sectors_written_start;
 937         u64 s_kbytes_written;
 938
 939         unsigned int s_log_groups_per_flex;
 940         struct flex_groups *s_flex_groups;
 941 };
 942
 943 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
 944 {
 945         return sb->s_fs_info;
 946 }
 947 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 948 {
 949         return container_of(inode, struct ext4_inode_info, vfs_inode);
 950 }
 951
 952 static inline struct timespec ext4_current_time(struct inode *inode)
 953 {
 954         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 955                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 956 }
 957
 958 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 959 {
 960         return ino == EXT4_ROOT_INO ||
 961                 ino == EXT4_JOURNAL_INO ||
 962                 ino == EXT4_RESIZE_INO ||
 963                 (ino >= EXT4_FIRST_INO(sb) &&
 964                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 965 }
 966 #else
 967 /* Assume that user mode programs are passing in an ext4fs superblock, not
 968  * a kernel struct super_block.  This will allow us to call the feature-test
 969  * macros from user land. */
 970 #define EXT4_SB(sb)     (sb)
 971 #endif
 972
 973 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 974
 975 /*
 976  * Codes for operating systems
 977  */
 978 #define EXT4_OS_LINUX           0
 979 #define EXT4_OS_HURD            1
 980 #define EXT4_OS_MASIX           2
 981 #define EXT4_OS_FREEBSD         3
 982 #define EXT4_OS_LITES           4
 983
 984 /*
 985  * Revision levels
 986  */
 987 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 988 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 989
 990 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 991 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 992
 993 #define EXT4_GOOD_OLD_INODE_SIZE 128
 994
 995 /*
 996  * Feature set definitions
 997  */
 998
 999 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
1000         ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1001 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
1002         ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1003 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
1004         ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1005 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
1006         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1007 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
1008         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1009 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
1010         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1011 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
1012         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1013 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
1014         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1015 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
1016         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1017
1018 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1019 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1020 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1021 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1022 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1023 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1024
1025 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1026 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1027 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1028 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1029 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1030 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1031 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1032
1033 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1034 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1035 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1036 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1037 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1038 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1039 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1040 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1041 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1042
1043 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
1044 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1045                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1046                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1047                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1048                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1049                                          EXT4_FEATURE_INCOMPAT_FLEX_BG)
1050 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1051                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1052                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1053                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1054                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1055                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1056                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1057
1058 /*
1059  * Default values for user and/or group using reserved blocks
1060  */
1061 #define EXT4_DEF_RESUID         0
1062 #define EXT4_DEF_RESGID         0
1063
1064 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1065
1066 /*
1067  * Default mount options
1068  */
1069 #define EXT4_DEFM_DEBUG         0x0001
1070 #define EXT4_DEFM_BSDGROUPS     0x0002
1071 #define EXT4_DEFM_XATTR_USER    0x0004
1072 #define EXT4_DEFM_ACL           0x0008
1073 #define EXT4_DEFM_UID16         0x0010
1074 #define EXT4_DEFM_JMODE         0x0060
1075 #define EXT4_DEFM_JMODE_DATA    0x0020
1076 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1077 #define EXT4_DEFM_JMODE_WBACK   0x0060
1078
1079 /*
1080  * Default journal batch times
1081  */
1082 #define EXT4_DEF_MIN_BATCH_TIME 0
1083 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1084
1085 /*
1086  * Minimum number of groups in a flexgroup before we separate out
1087  * directories into the first block group of a flexgroup
1088  */
1089 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1090
1091 /*
1092  * Structure of a directory entry
1093  */
1094 #define EXT4_NAME_LEN 255
1095
1096 struct ext4_dir_entry {
1097         __le32  inode;                  /* Inode number */
1098         __le16  rec_len;                /* Directory entry length */
1099         __le16  name_len;               /* Name length */
1100         char    name[EXT4_NAME_LEN];    /* File name */
1101 };
1102
1103 /*
1104  * The new version of the directory entry.  Since EXT4 structures are
1105  * stored in intel byte order, and the name_len field could never be
1106  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1107  * file_type field.
1108  */
1109 struct ext4_dir_entry_2 {
1110         __le32  inode;                  /* Inode number */
1111         __le16  rec_len;                /* Directory entry length */
1112         __u8    name_len;               /* Name length */
1113         __u8    file_type;
1114         char    name[EXT4_NAME_LEN];    /* File name */
1115 };
1116
1117 /*
1118  * Ext4 directory file types.  Only the low 3 bits are used.  The
1119  * other bits are reserved for now.
1120  */
1121 #define EXT4_FT_UNKNOWN         0
1122 #define EXT4_FT_REG_FILE        1
1123 #define EXT4_FT_DIR             2
1124 #define EXT4_FT_CHRDEV          3
1125 #define EXT4_FT_BLKDEV          4
1126 #define EXT4_FT_FIFO            5
1127 #define EXT4_FT_SOCK            6
1128 #define EXT4_FT_SYMLINK         7
1129
1130 #define EXT4_FT_MAX             8
1131
1132 /*
1133  * EXT4_DIR_PAD defines the directory entries boundaries
1134  *
1135  * NOTE: It must be a multiple of 4
1136  */
1137 #define EXT4_DIR_PAD                    4
1138 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1139 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1140                                          ~EXT4_DIR_ROUND)
1141 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1142
1143 /*
1144  * Hash Tree Directory indexing
1145  * (c) Daniel Phillips, 2001
1146  */
1147
1148 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1149                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1150                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1151 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1152 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1153
1154 /* Legal values for the dx_root hash_version field: */
1155
1156 #define DX_HASH_LEGACY          0
1157 #define DX_HASH_HALF_MD4        1
1158 #define DX_HASH_TEA             2
1159 #define DX_HASH_LEGACY_UNSIGNED 3
1160 #define DX_HASH_HALF_MD4_UNSIGNED       4
1161 #define DX_HASH_TEA_UNSIGNED            5
1162
1163 #ifdef __KERNEL__
1164
1165 /* hash info structure used by the directory hash */
1166 struct dx_hash_info
1167 {
1168         u32             hash;
1169         u32             minor_hash;
1170         int             hash_version;
1171         u32             *seed;
1172 };
1173
1174 #define EXT4_HTREE_EOF  0x7fffffff
1175
1176 /*
1177  * Control parameters used by ext4_htree_next_block
1178  */
1179 #define HASH_NB_ALWAYS          1
1180
1181
1182 /*
1183  * Describe an inode's exact location on disk and in memory
1184  */
1185 struct ext4_iloc
1186 {
1187         struct buffer_head *bh;
1188         unsigned long offset;
1189         ext4_group_t block_group;
1190 };
1191
1192 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1193 {
1194         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1195 }
1196
1197 /*
1198  * This structure is stuffed into the struct file's private_data field
1199  * for directories.  It is where we put information so that we can do
1200  * readdir operations in hash tree order.
1201  */
1202 struct dir_private_info {
1203         struct rb_root  root;
1204         struct rb_node  *curr_node;
1205         struct fname    *extra_fname;
1206         loff_t          last_pos;
1207         __u32           curr_hash;
1208         __u32           curr_minor_hash;
1209         __u32           next_hash;
1210 };
1211
1212 /* calculate the first block number of the group */
1213 static inline ext4_fsblk_t
1214 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1215 {
1216         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1217                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1218 }
1219
1220 /*
1221  * Special error return code only used by dx_probe() and its callers.
1222  */
1223 #define ERR_BAD_DX_DIR  -75000
1224
1225 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1226                         ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1227
1228 extern struct proc_dir_entry *ext4_proc_root;
1229
1230 /*
1231  * Function prototypes
1232  */
1233
1234 /*
1235  * Ok, these declarations are also in <linux/kernel.h> but none of the
1236  * ext4 source programs needs to include it so they are duplicated here.
1237  */
1238 # define NORET_TYPE     /**/
1239 # define ATTRIB_NORET   __attribute__((noreturn))
1240 # define NORET_AND      noreturn,
1241
1242 /* bitmap.c */
1243 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1244
1245 /* balloc.c */
1246 extern unsigned int ext4_block_group(struct super_block *sb,
1247                         ext4_fsblk_t blocknr);
1248 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1249                         ext4_fsblk_t blocknr);
1250 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1251 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1252                         ext4_group_t group);
1253 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1254                         ext4_fsblk_t goal, unsigned long *count, int *errp);
1255 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1256 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1257 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1258                         ext4_fsblk_t block, unsigned long count, int metadata);
1259 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1260                                 ext4_fsblk_t block, unsigned long count);
1261 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1262 extern void ext4_check_blocks_bitmap(struct super_block *);
1263 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1264                                                     ext4_group_t block_group,
1265                                                     struct buffer_head ** bh);
1266 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1267 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1268                                       ext4_group_t block_group);
1269 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1270                                        struct buffer_head *bh,
1271                                        ext4_group_t group,
1272                                        struct ext4_group_desc *desc);
1273 #define ext4_free_blocks_after_init(sb, group, desc)                    \
1274                 ext4_init_block_bitmap(sb, NULL, group, desc)
1275
1276 /* dir.c */
1277 extern int ext4_check_dir_entry(const char *, struct inode *,
1278                                 struct ext4_dir_entry_2 *,
1279                                 struct buffer_head *, unsigned int);
1280 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1281                                     __u32 minor_hash,
1282                                     struct ext4_dir_entry_2 *dirent);
1283 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1284
1285 /* fsync.c */
1286 extern int ext4_sync_file(struct file *, struct dentry *, int);
1287
1288 /* hash.c */
1289 extern int ext4fs_dirhash(const char *name, int len, struct
1290                           dx_hash_info *hinfo);
1291
1292 /* ialloc.c */
1293 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1294 extern void ext4_free_inode(handle_t *, struct inode *);
1295 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1296 extern unsigned long ext4_count_free_inodes(struct super_block *);
1297 extern unsigned long ext4_count_dirs(struct super_block *);
1298 extern void ext4_check_inodes_bitmap(struct super_block *);
1299 extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1300                                        struct buffer_head *bh,
1301                                        ext4_group_t group,
1302                                        struct ext4_group_desc *desc);
1303 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1304
1305 /* mballoc.c */
1306 extern long ext4_mb_stats;
1307 extern long ext4_mb_max_to_scan;
1308 extern int ext4_mb_init(struct super_block *, int);
1309 extern int ext4_mb_release(struct super_block *);
1310 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1311                                 struct ext4_allocation_request *, int *);
1312 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1313 extern void ext4_discard_preallocations(struct inode *);
1314 extern int __init init_ext4_mballoc(void);
1315 extern void exit_ext4_mballoc(void);
1316 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1317                 unsigned long, unsigned long, int, unsigned long *);
1318 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1319                 ext4_group_t i, struct ext4_group_desc *desc);
1320 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1321                 ext4_grpblk_t add);
1322 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1323 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1324                                                 ext4_group_t, int);
1325 /* inode.c */
1326 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1327                 struct buffer_head *bh, ext4_fsblk_t blocknr);
1328 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1329                                                 ext4_lblk_t, int, int *);
1330 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1331                                                 ext4_lblk_t, int, int *);
1332 int ext4_get_block(struct inode *inode, sector_t iblock,
1333                                 struct buffer_head *bh_result, int create);
1334
1335 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1336 extern int  ext4_write_inode(struct inode *, int);
1337 extern int  ext4_setattr(struct dentry *, struct iattr *);
1338 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1339                                 struct kstat *stat);
1340 extern void ext4_delete_inode(struct inode *);
1341 extern int  ext4_sync_inode(handle_t *, struct inode *);
1342 extern void ext4_dirty_inode(struct inode *);
1343 extern int ext4_change_inode_journal_flag(struct inode *, int);
1344 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1345 extern int ext4_can_truncate(struct inode *inode);
1346 extern void ext4_truncate(struct inode *);
1347 extern void ext4_set_inode_flags(struct inode *);
1348 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1349 extern int ext4_alloc_da_blocks(struct inode *inode);
1350 extern void ext4_set_aops(struct inode *inode);
1351 extern int ext4_writepage_trans_blocks(struct inode *);
1352 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1353 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1354 extern int ext4_block_truncate_page(handle_t *handle,
1355                 struct address_space *mapping, loff_t from);
1356 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1357 extern qsize_t ext4_get_reserved_space(struct inode *inode);
1358
1359 /* ioctl.c */
1360 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1361 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1362
1363 /* migrate.c */
1364 extern int ext4_ext_migrate(struct inode *);
1365
1366 /* namei.c */
1367 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1368 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1369 extern int ext4_orphan_add(handle_t *, struct inode *);
1370 extern int ext4_orphan_del(handle_t *, struct inode *);
1371 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1372                                 __u32 start_minor_hash, __u32 *next_hash);
1373
1374 /* resize.c */
1375 extern int ext4_group_add(struct super_block *sb,
1376                                 struct ext4_new_group_data *input);
1377 extern int ext4_group_extend(struct super_block *sb,
1378                                 struct ext4_super_block *es,
1379                                 ext4_fsblk_t n_blocks_count);
1380
1381 /* super.c */
1382 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1383         __attribute__ ((format (printf, 3, 4)));
1384 extern void __ext4_std_error(struct super_block *, const char *, int);
1385 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1386         __attribute__ ((format (printf, 3, 4)));
1387 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1388         __attribute__ ((format (printf, 3, 4)));
1389 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1390                                 const char *, const char *, ...)
1391         __attribute__ ((format (printf, 4, 5)));
1392 extern void ext4_update_dynamic_rev(struct super_block *sb);
1393 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1394                                         __u32 compat);
1395 extern int ext4_update_rocompat_feature(handle_t *handle,
1396                                         struct super_block *sb, __u32 rocompat);
1397 extern int ext4_update_incompat_feature(handle_t *handle,
1398                                         struct super_block *sb, __u32 incompat);
1399 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1400                                       struct ext4_group_desc *bg);
1401 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1402                                       struct ext4_group_desc *bg);
1403 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1404                                      struct ext4_group_desc *bg);
1405 extern __u32 ext4_free_blks_count(struct super_block *sb,
1406                                 struct ext4_group_desc *bg);
1407 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1408                                  struct ext4_group_desc *bg);
1409 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1410                                 struct ext4_group_desc *bg);
1411 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1412                                    struct ext4_group_desc *bg);
1413 extern void ext4_block_bitmap_set(struct super_block *sb,
1414                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1415 extern void ext4_inode_bitmap_set(struct super_block *sb,
1416                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1417 extern void ext4_inode_table_set(struct super_block *sb,
1418                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1419 extern void ext4_free_blks_set(struct super_block *sb,
1420                                struct ext4_group_desc *bg, __u32 count);
1421 extern void ext4_free_inodes_set(struct super_block *sb,
1422                                 struct ext4_group_desc *bg, __u32 count);
1423 extern void ext4_used_dirs_set(struct super_block *sb,
1424                                 struct ext4_group_desc *bg, __u32 count);
1425 extern void ext4_itable_unused_set(struct super_block *sb,
1426                                    struct ext4_group_desc *bg, __u32 count);
1427 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1428                                    struct ext4_group_desc *gdp);
1429 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1430                                        struct ext4_group_desc *gdp);
1431
1432 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1433 {
1434         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1435                 le32_to_cpu(es->s_blocks_count_lo);
1436 }
1437
1438 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1439 {
1440         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1441                 le32_to_cpu(es->s_r_blocks_count_lo);
1442 }
1443
1444 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1445 {
1446         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1447                 le32_to_cpu(es->s_free_blocks_count_lo);
1448 }
1449
1450 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1451                                          ext4_fsblk_t blk)
1452 {
1453         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1454         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1455 }
1456
1457 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1458                                               ext4_fsblk_t blk)
1459 {
1460         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1461         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1462 }
1463
1464 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1465                                            ext4_fsblk_t blk)
1466 {
1467         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1468         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1469 }
1470
1471 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1472 {
1473         if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1474                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1475                         le32_to_cpu(raw_inode->i_size_lo);
1476         else
1477                 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1478 }
1479
1480 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1481 {
1482         raw_inode->i_size_lo = cpu_to_le32(i_size);
1483         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1484 }
1485
1486 static inline
1487 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1488                                             ext4_group_t group)
1489 {
1490          struct ext4_group_info ***grp_info;
1491          long indexv, indexh;
1492          grp_info = EXT4_SB(sb)->s_group_info;
1493          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1494          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1495          return grp_info[indexv][indexh];
1496 }
1497
1498 /*
1499  * Reading s_groups_count requires using smp_rmb() afterwards.  See
1500  * the locking protocol documented in the comments of ext4_group_add()
1501  * in resize.c
1502  */
1503 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1504 {
1505         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
1506
1507         smp_rmb();
1508         return ngroups;
1509 }
1510
1511 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1512                                              ext4_group_t block_group)
1513 {
1514         return block_group >> sbi->s_log_groups_per_flex;
1515 }
1516
1517 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1518 {
1519         return 1 << sbi->s_log_groups_per_flex;
1520 }
1521
1522 #define ext4_std_error(sb, errno)                               \
1523 do {                                                            \
1524         if ((errno))                                            \
1525                 __ext4_std_error((sb), __func__, (errno));      \
1526 } while (0)
1527
1528 #ifdef CONFIG_SMP
1529 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1530  * counters. So we need to make sure we have free blocks more
1531  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
1532  */
1533 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1534 #else
1535 #define EXT4_FREEBLOCKS_WATERMARK 0
1536 #endif
1537
1538 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1539 {
1540         /*
1541          * XXX: replace with spinlock if seen contended -bzzz
1542          */
1543         down_write(&EXT4_I(inode)->i_data_sem);
1544         if (newsize > EXT4_I(inode)->i_disksize)
1545                 EXT4_I(inode)->i_disksize = newsize;
1546         up_write(&EXT4_I(inode)->i_data_sem);
1547         return ;
1548 }
1549
1550 struct ext4_group_info {
1551         unsigned long   bb_state;
1552         struct rb_root  bb_free_root;
1553         unsigned short  bb_first_free;
1554         unsigned short  bb_free;
1555         unsigned short  bb_fragments;
1556         struct          list_head bb_prealloc_list;
1557 #ifdef DOUBLE_CHECK
1558         void            *bb_bitmap;
1559 #endif
1560         struct rw_semaphore alloc_sem;
1561         unsigned short  bb_counters[];
1562 };
1563
1564 #define EXT4_GROUP_INFO_NEED_INIT_BIT   0
1565
1566 #define EXT4_MB_GRP_NEED_INIT(grp)      \
1567         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1568
1569 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1570                                               ext4_group_t group)
1571 {
1572         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1573 }
1574
1575 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1576 {
1577         spin_lock(ext4_group_lock_ptr(sb, group));
1578 }
1579
1580 static inline void ext4_unlock_group(struct super_block *sb,
1581                                         ext4_group_t group)
1582 {
1583         spin_unlock(ext4_group_lock_ptr(sb, group));
1584 }
1585
1586 /*
1587  * Inodes and files operations
1588  */
1589
1590 /* dir.c */
1591 extern const struct file_operations ext4_dir_operations;
1592
1593 /* file.c */
1594 extern const struct inode_operations ext4_file_inode_operations;
1595 extern const struct file_operations ext4_file_operations;
1596
1597 /* namei.c */
1598 extern const struct inode_operations ext4_dir_inode_operations;
1599 extern const struct inode_operations ext4_special_inode_operations;
1600 extern struct dentry *ext4_get_parent(struct dentry *child);
1601
1602 /* symlink.c */
1603 extern const struct inode_operations ext4_symlink_inode_operations;
1604 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1605
1606 /* extents.c */
1607 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1608 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1609 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1610                                        int chunk);
1611 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1612                                ext4_lblk_t iblock, unsigned int max_blocks,
1613                                struct buffer_head *bh_result,
1614                                int create, int extend_disksize);
1615 extern void ext4_ext_truncate(struct inode *);
1616 extern void ext4_ext_init(struct super_block *);
1617 extern void ext4_ext_release(struct super_block *);
1618 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1619                           loff_t len);
1620 extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1621                            sector_t block, unsigned int max_blocks,
1622                            struct buffer_head *bh, int create,
1623                            int extend_disksize, int flag);
1624 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1625                         __u64 start, __u64 len);
1626
1627 /*
1628  * Add new method to test wether block and inode bitmaps are properly
1629  * initialized. With uninit_bg reading the block from disk is not enough
1630  * to mark the bitmap uptodate. We need to also zero-out the bitmap
1631  */
1632 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1633
1634 static inline int bitmap_uptodate(struct buffer_head *bh)
1635 {
1636         return (buffer_uptodate(bh) &&
1637                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1638 }
1639 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1640 {
1641         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1642 }
1643
1644 #endif  /* __KERNEL__ */
1645
1646 #endif  /* _EXT4_H */