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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 "ext4_i.h"
  23
  24 /*
  25  * The fourth extended filesystem constants/structures
  26  */
  27
  28 /*
  29  * Define EXT4FS_DEBUG to produce debug messages
  30  */
  31 #undef EXT4FS_DEBUG
  32
  33 /*
  34  * Define EXT4_RESERVATION to reserve data blocks for expanding files
  35  */
  36 #define EXT4_DEFAULT_RESERVE_BLOCKS     8
  37 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  38 #define EXT4_MAX_RESERVE_BLOCKS         1027
  39 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
  40
  41 /*
  42  * Debug code
  43  */
  44 #ifdef EXT4FS_DEBUG
  45 #define ext4_debug(f, a...)                                             \
  46         do {                                                            \
  47                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  48                         __FILE__, __LINE__, __func__);                  \
  49                 printk(KERN_DEBUG f, ## a);                             \
  50         } while (0)
  51 #else
  52 #define ext4_debug(f, a...)     do {} while (0)
  53 #endif
  54
  55 #define EXT4_MULTIBLOCK_ALLOCATOR       1
  56
  57 /* prefer goal again. length */
  58 #define EXT4_MB_HINT_MERGE              1
  59 /* blocks already reserved */
  60 #define EXT4_MB_HINT_RESERVED           2
  61 /* metadata is being allocated */
  62 #define EXT4_MB_HINT_METADATA           4
  63 /* first blocks in the file */
  64 #define EXT4_MB_HINT_FIRST              8
  65 /* search for the best chunk */
  66 #define EXT4_MB_HINT_BEST               16
  67 /* data is being allocated */
  68 #define EXT4_MB_HINT_DATA               32
  69 /* don't preallocate (for tails) */
  70 #define EXT4_MB_HINT_NOPREALLOC         64
  71 /* allocate for locality group */
  72 #define EXT4_MB_HINT_GROUP_ALLOC        128
  73 /* allocate goal blocks or none */
  74 #define EXT4_MB_HINT_GOAL_ONLY          256
  75 /* goal is meaningful */
  76 #define EXT4_MB_HINT_TRY_GOAL           512
  77 /* blocks already pre-reserved by delayed allocation */
  78 #define EXT4_MB_DELALLOC_RESERVED      1024
  79
  80
  81 struct ext4_allocation_request {
  82         /* target inode for block we're allocating */
  83         struct inode *inode;
  84         /* logical block in target inode */
  85         ext4_lblk_t logical;
  86         /* phys. target (a hint) */
  87         ext4_fsblk_t goal;
  88         /* the closest logical allocated block to the left */
  89         ext4_lblk_t lleft;
  90         /* phys. block for ^^^ */
  91         ext4_fsblk_t pleft;
  92         /* the closest logical allocated block to the right */
  93         ext4_lblk_t lright;
  94         /* phys. block for ^^^ */
  95         ext4_fsblk_t pright;
  96         /* how many blocks we want to allocate */
  97         unsigned long len;
  98         /* flags. see above EXT4_MB_HINT_* */
  99         unsigned long flags;
 100 };
 101
 102 /*
 103  * Special inodes numbers
 104  */
 105 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 106 #define EXT4_ROOT_INO            2      /* Root inode */
 107 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 108 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 109 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 110 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 111
 112 /* First non-reserved inode for old ext4 filesystems */
 113 #define EXT4_GOOD_OLD_FIRST_INO 11
 114
 115 /*
 116  * Maximal count of links to a file
 117  */
 118 #define EXT4_LINK_MAX           65000
 119
 120 /*
 121  * Macro-instructions used to manage several block sizes
 122  */
 123 #define EXT4_MIN_BLOCK_SIZE             1024
 124 #define EXT4_MAX_BLOCK_SIZE             65536
 125 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 126 #ifdef __KERNEL__
 127 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 128 #else
 129 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 130 #endif
 131 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 132 #ifdef __KERNEL__
 133 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 134 #else
 135 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 136 #endif
 137 #ifdef __KERNEL__
 138 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 139 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 140 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 141 #else
 142 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 143                                  EXT4_GOOD_OLD_INODE_SIZE : \
 144                                  (s)->s_inode_size)
 145 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 146                                  EXT4_GOOD_OLD_FIRST_INO : \
 147                                  (s)->s_first_ino)
 148 #endif
 149 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 150
 151 /*
 152  * Structure of a blocks group descriptor
 153  */
 154 struct ext4_group_desc
 155 {
 156         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 157         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 158         __le32  bg_inode_table_lo;      /* Inodes table block */
 159         __le16  bg_free_blocks_count;   /* Free blocks count */
 160         __le16  bg_free_inodes_count;   /* Free inodes count */
 161         __le16  bg_used_dirs_count;     /* Directories count */
 162         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 163         __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */
 164         __le16  bg_itable_unused;       /* Unused inodes count */
 165         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 166         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 167         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 168         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 169         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 170         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 171         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 172         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 173         __u32   bg_reserved2[3];
 174 };
 175
 176 /*
 177  * Structure of a flex block group info
 178  */
 179
 180 struct flex_groups {
 181         __u32 free_inodes;
 182         __u32 free_blocks;
 183 };
 184
 185 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 186 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 187 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 188
 189 #ifdef __KERNEL__
 190 #include "ext4_sb.h"
 191 #endif
 192 /*
 193  * Macro-instructions used to manage group descriptors
 194  */
 195 #define EXT4_MIN_DESC_SIZE              32
 196 #define EXT4_MIN_DESC_SIZE_64BIT        64
 197 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 198 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 199 #ifdef __KERNEL__
 200 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 201 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 202 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 203 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 204 #else
 205 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 206 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 207 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 208 #endif
 209
 210 /*
 211  * Constants relative to the data blocks
 212  */
 213 #define EXT4_NDIR_BLOCKS                12
 214 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 215 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 216 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 217 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 218
 219 /*
 220  * Inode flags
 221  */
 222 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 223 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 224 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 225 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 226 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 227 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 228 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 229 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 230 /* Reserved for compression usage... */
 231 #define EXT4_DIRTY_FL                   0x00000100
 232 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 233 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 234 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 235 /* End compression flags --- maybe not all used */
 236 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 237 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 238 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 239 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 240 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 241 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 242 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 243 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 244 #define EXT4_EXT_MIGRATE                0x00100000 /* Inode is migrating */
 245 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 246
 247 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 248 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 249
 250 /*
 251  * Inode dynamic state flags
 252  */
 253 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 254 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 255 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 256 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 257
 258 /* Used to pass group descriptor data when online resize is done */
 259 struct ext4_new_group_input {
 260         __u32 group;            /* Group number for this data */
 261         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 262         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 263         __u64 inode_table;      /* Absolute block number of inode table start */
 264         __u32 blocks_count;     /* Total number of blocks in this group */
 265         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 266         __u16 unused;
 267 };
 268
 269 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 270 struct ext4_new_group_data {
 271         __u32 group;
 272         __u64 block_bitmap;
 273         __u64 inode_bitmap;
 274         __u64 inode_table;
 275         __u32 blocks_count;
 276         __u16 reserved_blocks;
 277         __u16 unused;
 278         __u32 free_blocks_count;
 279 };
 280
 281 /*
 282  * Following is used by preallocation code to tell get_blocks() that we
 283  * want uninitialzed extents.
 284  */
 285 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 286
 287 /*
 288  * ioctl commands
 289  */
 290 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 291 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 292 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 293 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 294 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 295 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 296 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 297 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 298 #ifdef CONFIG_JBD2_DEBUG
 299 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 300 #endif
 301 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 302 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 303 #define EXT4_IOC_MIGRATE                _IO('f', 7)
 304
 305 /*
 306  * ioctl commands in 32 bit emulation
 307  */
 308 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 309 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 310 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 311 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 312 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 313 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 314 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 315 #ifdef CONFIG_JBD2_DEBUG
 316 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 317 #endif
 318 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 319 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 320
 321
 322 /*
 323  *  Mount options
 324  */
 325 struct ext4_mount_options {
 326         unsigned long s_mount_opt;
 327         uid_t s_resuid;
 328         gid_t s_resgid;
 329         unsigned long s_commit_interval;
 330 #ifdef CONFIG_QUOTA
 331         int s_jquota_fmt;
 332         char *s_qf_names[MAXQUOTAS];
 333 #endif
 334 };
 335
 336 /*
 337  * Structure of an inode on the disk
 338  */
 339 struct ext4_inode {
 340         __le16  i_mode;         /* File mode */
 341         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 342         __le32  i_size_lo;      /* Size in bytes */
 343         __le32  i_atime;        /* Access time */
 344         __le32  i_ctime;        /* Inode Change time */
 345         __le32  i_mtime;        /* Modification time */
 346         __le32  i_dtime;        /* Deletion Time */
 347         __le16  i_gid;          /* Low 16 bits of Group Id */
 348         __le16  i_links_count;  /* Links count */
 349         __le32  i_blocks_lo;    /* Blocks count */
 350         __le32  i_flags;        /* File flags */
 351         union {
 352                 struct {
 353                         __le32  l_i_version;
 354                 } linux1;
 355                 struct {
 356                         __u32  h_i_translator;
 357                 } hurd1;
 358                 struct {
 359                         __u32  m_i_reserved1;
 360                 } masix1;
 361         } osd1;                         /* OS dependent 1 */
 362         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 363         __le32  i_generation;   /* File version (for NFS) */
 364         __le32  i_file_acl_lo;  /* File ACL */
 365         __le32  i_size_high;
 366         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 367         union {
 368                 struct {
 369                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 370                         __le16  l_i_file_acl_high;
 371                         __le16  l_i_uid_high;   /* these 2 fields */
 372                         __le16  l_i_gid_high;   /* were reserved2[0] */
 373                         __u32   l_i_reserved2;
 374                 } linux2;
 375                 struct {
 376                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 377                         __u16   h_i_mode_high;
 378                         __u16   h_i_uid_high;
 379                         __u16   h_i_gid_high;
 380                         __u32   h_i_author;
 381                 } hurd2;
 382                 struct {
 383                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 384                         __le16  m_i_file_acl_high;
 385                         __u32   m_i_reserved2[2];
 386                 } masix2;
 387         } osd2;                         /* OS dependent 2 */
 388         __le16  i_extra_isize;
 389         __le16  i_pad1;
 390         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 391         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 392         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 393         __le32  i_crtime;       /* File Creation time */
 394         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 395         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 396 };
 397
 398
 399 #define EXT4_EPOCH_BITS 2
 400 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 401 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 402
 403 /*
 404  * Extended fields will fit into an inode if the filesystem was formatted
 405  * with large inodes (-I 256 or larger) and there are not currently any EAs
 406  * consuming all of the available space. For new inodes we always reserve
 407  * enough space for the kernel's known extended fields, but for inodes
 408  * created with an old kernel this might not have been the case. None of
 409  * the extended inode fields is critical for correct filesystem operation.
 410  * This macro checks if a certain field fits in the inode. Note that
 411  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 412  */
 413 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 414         ((offsetof(typeof(*ext4_inode), field) +        \
 415           sizeof((ext4_inode)->field))                  \
 416         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 417             (einode)->i_extra_isize))                   \
 418
 419 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 420 {
 421        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 422                            time->tv_sec >> 32 : 0) |
 423                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 424 }
 425
 426 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 427 {
 428        if (sizeof(time->tv_sec) > 4)
 429                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 430                                << 32;
 431        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 432 }
 433
 434 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 435 do {                                                                           \
 436         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 437         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 438                 (raw_inode)->xtime ## _extra =                                 \
 439                                 ext4_encode_extra_time(&(inode)->xtime);       \
 440 } while (0)
 441
 442 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 443 do {                                                                           \
 444         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 445                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 446         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 447                 (raw_inode)->xtime ## _extra =                                 \
 448                                 ext4_encode_extra_time(&(einode)->xtime);      \
 449 } while (0)
 450
 451 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 452 do {                                                                           \
 453         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 454         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 455                 ext4_decode_extra_time(&(inode)->xtime,                        \
 456                                        raw_inode->xtime ## _extra);            \
 457 } while (0)
 458
 459 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 460 do {                                                                           \
 461         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 462                 (einode)->xtime.tv_sec =                                       \
 463                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 464         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 465                 ext4_decode_extra_time(&(einode)->xtime,                       \
 466                                        raw_inode->xtime ## _extra);            \
 467 } while (0)
 468
 469 #define i_disk_version osd1.linux1.l_i_version
 470
 471 #if defined(__KERNEL__) || defined(__linux__)
 472 #define i_reserved1     osd1.linux1.l_i_reserved1
 473 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 474 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 475 #define i_uid_low       i_uid
 476 #define i_gid_low       i_gid
 477 #define i_uid_high      osd2.linux2.l_i_uid_high
 478 #define i_gid_high      osd2.linux2.l_i_gid_high
 479 #define i_reserved2     osd2.linux2.l_i_reserved2
 480
 481 #elif defined(__GNU__)
 482
 483 #define i_translator    osd1.hurd1.h_i_translator
 484 #define i_uid_high      osd2.hurd2.h_i_uid_high
 485 #define i_gid_high      osd2.hurd2.h_i_gid_high
 486 #define i_author        osd2.hurd2.h_i_author
 487
 488 #elif defined(__masix__)
 489
 490 #define i_reserved1     osd1.masix1.m_i_reserved1
 491 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 492 #define i_reserved2     osd2.masix2.m_i_reserved2
 493
 494 #endif /* defined(__KERNEL__) || defined(__linux__) */
 495
 496 /*
 497  * File system states
 498  */
 499 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 500 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 501 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 502
 503 /*
 504  * Misc. filesystem flags
 505  */
 506 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 507 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 508 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 509
 510 /*
 511  * Mount flags
 512  */
 513 #define EXT4_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 514 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 515 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 516 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 517 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 518 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 519 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 520 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 521 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 522 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 523 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 524 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 525 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 526 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 527 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 528 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 529 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 530 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 531 #define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */
 532 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 533 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 534 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 535 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 536 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 537 #define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */
 538 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
 539 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 540 #define EXT4_MOUNT_I_VERSION            0x2000000 /* i_version support */
 541 #define EXT4_MOUNT_MBALLOC              0x4000000 /* Buddy allocation support */
 542 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
 543 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 544 #ifndef _LINUX_EXT2_FS_H
 545 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 546 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 547 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 548                                          EXT4_MOUNT_##opt)
 549 #else
 550 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 551 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 552 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 553 #endif
 554
 555 #define ext4_set_bit                    ext2_set_bit
 556 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 557 #define ext4_clear_bit                  ext2_clear_bit
 558 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 559 #define ext4_test_bit                   ext2_test_bit
 560 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 561 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 562 #define ext4_find_next_bit              ext2_find_next_bit
 563
 564 /*
 565  * Maximal mount counts between two filesystem checks
 566  */
 567 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 568 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 569
 570 /*
 571  * Behaviour when detecting errors
 572  */
 573 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 574 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 575 #define EXT4_ERRORS_PANIC               3       /* Panic */
 576 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 577
 578 /*
 579  * Structure of the super block
 580  */
 581 struct ext4_super_block {
 582 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 583         __le32  s_blocks_count_lo;      /* Blocks count */
 584         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
 585         __le32  s_free_blocks_count_lo; /* Free blocks count */
 586 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 587         __le32  s_first_data_block;     /* First Data Block */
 588         __le32  s_log_block_size;       /* Block size */
 589         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 590 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 591         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 592         __le32  s_inodes_per_group;     /* # Inodes per group */
 593         __le32  s_mtime;                /* Mount time */
 594 /*30*/  __le32  s_wtime;                /* Write time */
 595         __le16  s_mnt_count;            /* Mount count */
 596         __le16  s_max_mnt_count;        /* Maximal mount count */
 597         __le16  s_magic;                /* Magic signature */
 598         __le16  s_state;                /* File system state */
 599         __le16  s_errors;               /* Behaviour when detecting errors */
 600         __le16  s_minor_rev_level;      /* minor revision level */
 601 /*40*/  __le32  s_lastcheck;            /* time of last check */
 602         __le32  s_checkinterval;        /* max. time between checks */
 603         __le32  s_creator_os;           /* OS */
 604         __le32  s_rev_level;            /* Revision level */
 605 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 606         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 607         /*
 608          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 609          *
 610          * Note: the difference between the compatible feature set and
 611          * the incompatible feature set is that if there is a bit set
 612          * in the incompatible feature set that the kernel doesn't
 613          * know about, it should refuse to mount the filesystem.
 614          *
 615          * e2fsck's requirements are more strict; if it doesn't know
 616          * about a feature in either the compatible or incompatible
 617          * feature set, it must abort and not try to meddle with
 618          * things it doesn't understand...
 619          */
 620         __le32  s_first_ino;            /* First non-reserved inode */
 621         __le16  s_inode_size;           /* size of inode structure */
 622         __le16  s_block_group_nr;       /* block group # of this superblock */
 623         __le32  s_feature_compat;       /* compatible feature set */
 624 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 625         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 626 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 627 /*78*/  char    s_volume_name[16];      /* volume name */
 628 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 629 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 630         /*
 631          * Performance hints.  Directory preallocation should only
 632          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 633          */
 634         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 635         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 636         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 637         /*
 638          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 639          */
 640 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 641 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 642         __le32  s_journal_dev;          /* device number of journal file */
 643         __le32  s_last_orphan;          /* start of list of inodes to delete */
 644         __le32  s_hash_seed[4];         /* HTREE hash seed */
 645         __u8    s_def_hash_version;     /* Default hash version to use */
 646         __u8    s_reserved_char_pad;
 647         __le16  s_desc_size;            /* size of group descriptor */
 648 /*100*/ __le32  s_default_mount_opts;
 649         __le32  s_first_meta_bg;        /* First metablock block group */
 650         __le32  s_mkfs_time;            /* When the filesystem was created */
 651         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 652         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 653 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 654         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 655         __le32  s_free_blocks_count_hi; /* Free blocks count */
 656         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
 657         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
 658         __le32  s_flags;                /* Miscellaneous flags */
 659         __le16  s_raid_stride;          /* RAID stride */
 660         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
 661         __le64  s_mmp_block;            /* Block for multi-mount protection */
 662         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 663         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
 664         __u8    s_reserved_char_pad2;
 665         __le16  s_reserved_pad;
 666         __u32   s_reserved[162];        /* Padding to the end of the block */
 667 };
 668
 669 #ifdef __KERNEL__
 670 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
 671 {
 672         return sb->s_fs_info;
 673 }
 674 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 675 {
 676         return container_of(inode, struct ext4_inode_info, vfs_inode);
 677 }
 678
 679 static inline struct timespec ext4_current_time(struct inode *inode)
 680 {
 681         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 682                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 683 }
 684
 685
 686 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 687 {
 688         return ino == EXT4_ROOT_INO ||
 689                 ino == EXT4_JOURNAL_INO ||
 690                 ino == EXT4_RESIZE_INO ||
 691                 (ino >= EXT4_FIRST_INO(sb) &&
 692                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 693 }
 694 #else
 695 /* Assume that user mode programs are passing in an ext4fs superblock, not
 696  * a kernel struct super_block.  This will allow us to call the feature-test
 697  * macros from user land. */
 698 #define EXT4_SB(sb)     (sb)
 699 #endif
 700
 701 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 702
 703 /*
 704  * Codes for operating systems
 705  */
 706 #define EXT4_OS_LINUX           0
 707 #define EXT4_OS_HURD            1
 708 #define EXT4_OS_MASIX           2
 709 #define EXT4_OS_FREEBSD         3
 710 #define EXT4_OS_LITES           4
 711
 712 /*
 713  * Revision levels
 714  */
 715 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 716 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 717
 718 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 719 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 720
 721 #define EXT4_GOOD_OLD_INODE_SIZE 128
 722
 723 /*
 724  * Feature set definitions
 725  */
 726
 727 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 728         (EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask))
 729 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 730         (EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask))
 731 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 732         (EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask))
 733 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 734         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 735 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 736         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 737 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 738         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 739 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 740         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 741 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 742         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 743 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 744         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 745
 746 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 747 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 748 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 749 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 750 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 751 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 752
 753 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 754 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 755 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 756 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
 757 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
 758 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 759 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 760
 761 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 762 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 763 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 764 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 765 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 766 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 767 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 768 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
 769 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
 770
 771 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 772 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 773                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 774                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 775                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 776                                          EXT4_FEATURE_INCOMPAT_64BIT| \
 777                                          EXT4_FEATURE_INCOMPAT_FLEX_BG)
 778 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 779                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 780                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
 781                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 782                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 783                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
 784                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
 785
 786 /*
 787  * Default values for user and/or group using reserved blocks
 788  */
 789 #define EXT4_DEF_RESUID         0
 790 #define EXT4_DEF_RESGID         0
 791
 792 /*
 793  * Default mount options
 794  */
 795 #define EXT4_DEFM_DEBUG         0x0001
 796 #define EXT4_DEFM_BSDGROUPS     0x0002
 797 #define EXT4_DEFM_XATTR_USER    0x0004
 798 #define EXT4_DEFM_ACL           0x0008
 799 #define EXT4_DEFM_UID16         0x0010
 800 #define EXT4_DEFM_JMODE         0x0060
 801 #define EXT4_DEFM_JMODE_DATA    0x0020
 802 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 803 #define EXT4_DEFM_JMODE_WBACK   0x0060
 804
 805 /*
 806  * Structure of a directory entry
 807  */
 808 #define EXT4_NAME_LEN 255
 809
 810 struct ext4_dir_entry {
 811         __le32  inode;                  /* Inode number */
 812         __le16  rec_len;                /* Directory entry length */
 813         __le16  name_len;               /* Name length */
 814         char    name[EXT4_NAME_LEN];    /* File name */
 815 };
 816
 817 /*
 818  * The new version of the directory entry.  Since EXT4 structures are
 819  * stored in intel byte order, and the name_len field could never be
 820  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 821  * file_type field.
 822  */
 823 struct ext4_dir_entry_2 {
 824         __le32  inode;                  /* Inode number */
 825         __le16  rec_len;                /* Directory entry length */
 826         __u8    name_len;               /* Name length */
 827         __u8    file_type;
 828         char    name[EXT4_NAME_LEN];    /* File name */
 829 };
 830
 831 /*
 832  * Ext4 directory file types.  Only the low 3 bits are used.  The
 833  * other bits are reserved for now.
 834  */
 835 #define EXT4_FT_UNKNOWN         0
 836 #define EXT4_FT_REG_FILE        1
 837 #define EXT4_FT_DIR             2
 838 #define EXT4_FT_CHRDEV          3
 839 #define EXT4_FT_BLKDEV          4
 840 #define EXT4_FT_FIFO            5
 841 #define EXT4_FT_SOCK            6
 842 #define EXT4_FT_SYMLINK         7
 843
 844 #define EXT4_FT_MAX             8
 845
 846 /*
 847  * EXT4_DIR_PAD defines the directory entries boundaries
 848  *
 849  * NOTE: It must be a multiple of 4
 850  */
 851 #define EXT4_DIR_PAD                    4
 852 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
 853 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
 854                                          ~EXT4_DIR_ROUND)
 855 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
 856
 857 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
 858 {
 859         unsigned len = le16_to_cpu(dlen);
 860
 861         if (len == EXT4_MAX_REC_LEN)
 862                 return 1 << 16;
 863         return len;
 864 }
 865
 866 static inline __le16 ext4_rec_len_to_disk(unsigned len)
 867 {
 868         if (len == (1 << 16))
 869                 return cpu_to_le16(EXT4_MAX_REC_LEN);
 870         else if (len > (1 << 16))
 871                 BUG();
 872         return cpu_to_le16(len);
 873 }
 874
 875 /*
 876  * Hash Tree Directory indexing
 877  * (c) Daniel Phillips, 2001
 878  */
 879
 880 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
 881                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
 882                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 883 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 884 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 885
 886 /* Legal values for the dx_root hash_version field: */
 887
 888 #define DX_HASH_LEGACY          0
 889 #define DX_HASH_HALF_MD4        1
 890 #define DX_HASH_TEA             2
 891
 892 #ifdef __KERNEL__
 893
 894 /* hash info structure used by the directory hash */
 895 struct dx_hash_info
 896 {
 897         u32             hash;
 898         u32             minor_hash;
 899         int             hash_version;
 900         u32             *seed;
 901 };
 902
 903 #define EXT4_HTREE_EOF  0x7fffffff
 904
 905 /*
 906  * Control parameters used by ext4_htree_next_block
 907  */
 908 #define HASH_NB_ALWAYS          1
 909
 910
 911 /*
 912  * Describe an inode's exact location on disk and in memory
 913  */
 914 struct ext4_iloc
 915 {
 916         struct buffer_head *bh;
 917         unsigned long offset;
 918         ext4_group_t block_group;
 919 };
 920
 921 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 922 {
 923         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 924 }
 925
 926 /*
 927  * This structure is stuffed into the struct file's private_data field
 928  * for directories.  It is where we put information so that we can do
 929  * readdir operations in hash tree order.
 930  */
 931 struct dir_private_info {
 932         struct rb_root  root;
 933         struct rb_node  *curr_node;
 934         struct fname    *extra_fname;
 935         loff_t          last_pos;
 936         __u32           curr_hash;
 937         __u32           curr_minor_hash;
 938         __u32           next_hash;
 939 };
 940
 941 /* calculate the first block number of the group */
 942 static inline ext4_fsblk_t
 943 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
 944 {
 945         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
 946                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 947 }
 948
 949 /*
 950  * Special error return code only used by dx_probe() and its callers.
 951  */
 952 #define ERR_BAD_DX_DIR  -75000
 953
 954 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 955                         unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
 956
 957 /*
 958  * Function prototypes
 959  */
 960
 961 /*
 962  * Ok, these declarations are also in <linux/kernel.h> but none of the
 963  * ext4 source programs needs to include it so they are duplicated here.
 964  */
 965 # define NORET_TYPE     /**/
 966 # define ATTRIB_NORET   __attribute__((noreturn))
 967 # define NORET_AND      noreturn,
 968
 969 /* balloc.c */
 970 extern unsigned int ext4_block_group(struct super_block *sb,
 971                         ext4_fsblk_t blocknr);
 972 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 973                         ext4_fsblk_t blocknr);
 974 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
 975 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
 976                         ext4_group_t group);
 977 extern ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
 978                         ext4_fsblk_t goal, int *errp);
 979 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
 980                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 981 extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
 982                                         ext4_lblk_t iblock, ext4_fsblk_t goal,
 983                                         unsigned long *count, int *errp);
 984 extern ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
 985                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 986 extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
 987                                                 ext4_fsblk_t nblocks);
 988 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
 989                         ext4_fsblk_t block, unsigned long count, int metadata);
 990 extern void ext4_free_blocks_sb(handle_t *handle, struct super_block *sb,
 991                                 ext4_fsblk_t block, unsigned long count,
 992                                 unsigned long *pdquot_freed_blocks);
 993 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
 994 extern void ext4_check_blocks_bitmap(struct super_block *);
 995 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
 996                                                     ext4_group_t block_group,
 997                                                     struct buffer_head ** bh);
 998 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
 999 extern void ext4_init_block_alloc_info(struct inode *);
1000 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
1001
1002 /* dir.c */
1003 extern int ext4_check_dir_entry(const char *, struct inode *,
1004                                 struct ext4_dir_entry_2 *,
1005                                 struct buffer_head *, unsigned long);
1006 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1007                                     __u32 minor_hash,
1008                                     struct ext4_dir_entry_2 *dirent);
1009 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1010
1011 /* fsync.c */
1012 extern int ext4_sync_file(struct file *, struct dentry *, int);
1013
1014 /* hash.c */
1015 extern int ext4fs_dirhash(const char *name, int len, struct
1016                           dx_hash_info *hinfo);
1017
1018 /* ialloc.c */
1019 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1020 extern void ext4_free_inode(handle_t *, struct inode *);
1021 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1022 extern unsigned long ext4_count_free_inodes(struct super_block *);
1023 extern unsigned long ext4_count_dirs(struct super_block *);
1024 extern void ext4_check_inodes_bitmap(struct super_block *);
1025 extern unsigned long ext4_count_free(struct buffer_head *, unsigned);
1026
1027 /* mballoc.c */
1028 extern long ext4_mb_stats;
1029 extern long ext4_mb_max_to_scan;
1030 extern int ext4_mb_init(struct super_block *, int);
1031 extern int ext4_mb_release(struct super_block *);
1032 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1033                                 struct ext4_allocation_request *, int *);
1034 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1035 extern void ext4_mb_discard_inode_preallocations(struct inode *);
1036 extern int __init init_ext4_mballoc(void);
1037 extern void exit_ext4_mballoc(void);
1038 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1039                 unsigned long, unsigned long, int, unsigned long *);
1040 extern int ext4_mb_add_more_groupinfo(struct super_block *sb,
1041                 ext4_group_t i, struct ext4_group_desc *desc);
1042 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1043                 ext4_grpblk_t add);
1044
1045
1046 /* inode.c */
1047 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1048                 struct buffer_head *bh, ext4_fsblk_t blocknr);
1049 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1050                                                 ext4_lblk_t, int, int *);
1051 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1052                                                 ext4_lblk_t, int, int *);
1053 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1054                                 ext4_lblk_t iblock, unsigned long maxblocks,
1055                                 struct buffer_head *bh_result,
1056                                 int create, int extend_disksize);
1057
1058 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1059 extern int  ext4_write_inode(struct inode *, int);
1060 extern int  ext4_setattr(struct dentry *, struct iattr *);
1061 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1062                                 struct kstat *stat);
1063 extern void ext4_delete_inode(struct inode *);
1064 extern int  ext4_sync_inode(handle_t *, struct inode *);
1065 extern void ext4_discard_reservation(struct inode *);
1066 extern void ext4_dirty_inode(struct inode *);
1067 extern int ext4_change_inode_journal_flag(struct inode *, int);
1068 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1069 extern int ext4_can_truncate(struct inode *inode);
1070 extern void ext4_truncate(struct inode *);
1071 extern void ext4_set_inode_flags(struct inode *);
1072 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1073 extern void ext4_set_aops(struct inode *inode);
1074 extern int ext4_writepage_trans_blocks(struct inode *);
1075 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1076 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1077 extern int ext4_block_truncate_page(handle_t *handle,
1078                 struct address_space *mapping, loff_t from);
1079 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1080
1081 /* ioctl.c */
1082 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1083 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1084
1085 /* migrate.c */
1086 extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
1087                        unsigned long);
1088 /* namei.c */
1089 extern int ext4_orphan_add(handle_t *, struct inode *);
1090 extern int ext4_orphan_del(handle_t *, struct inode *);
1091 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1092                                 __u32 start_minor_hash, __u32 *next_hash);
1093
1094 /* resize.c */
1095 extern int ext4_group_add(struct super_block *sb,
1096                                 struct ext4_new_group_data *input);
1097 extern int ext4_group_extend(struct super_block *sb,
1098                                 struct ext4_super_block *es,
1099                                 ext4_fsblk_t n_blocks_count);
1100
1101 /* super.c */
1102 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1103         __attribute__ ((format (printf, 3, 4)));
1104 extern void __ext4_std_error(struct super_block *, const char *, int);
1105 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1106         __attribute__ ((format (printf, 3, 4)));
1107 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1108         __attribute__ ((format (printf, 3, 4)));
1109 extern void ext4_update_dynamic_rev(struct super_block *sb);
1110 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1111                                         __u32 compat);
1112 extern int ext4_update_rocompat_feature(handle_t *handle,
1113                                         struct super_block *sb, __u32 rocompat);
1114 extern int ext4_update_incompat_feature(handle_t *handle,
1115                                         struct super_block *sb, __u32 incompat);
1116 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1117                                       struct ext4_group_desc *bg);
1118 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1119                                       struct ext4_group_desc *bg);
1120 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1121                                      struct ext4_group_desc *bg);
1122 extern void ext4_block_bitmap_set(struct super_block *sb,
1123                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1124 extern void ext4_inode_bitmap_set(struct super_block *sb,
1125                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1126 extern void ext4_inode_table_set(struct super_block *sb,
1127                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1128
1129 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1130 {
1131         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1132                 le32_to_cpu(es->s_blocks_count_lo);
1133 }
1134
1135 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1136 {
1137         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1138                 le32_to_cpu(es->s_r_blocks_count_lo);
1139 }
1140
1141 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1142 {
1143         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1144                 le32_to_cpu(es->s_free_blocks_count_lo);
1145 }
1146
1147 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1148                                          ext4_fsblk_t blk)
1149 {
1150         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1151         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1152 }
1153
1154 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1155                                               ext4_fsblk_t blk)
1156 {
1157         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1158         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1159 }
1160
1161 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1162                                            ext4_fsblk_t blk)
1163 {
1164         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1165         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1166 }
1167
1168 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1169 {
1170         return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1171                 le32_to_cpu(raw_inode->i_size_lo);
1172 }
1173
1174 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1175 {
1176         raw_inode->i_size_lo = cpu_to_le32(i_size);
1177         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1178 }
1179
1180 static inline
1181 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1182                                             ext4_group_t group)
1183 {
1184          struct ext4_group_info ***grp_info;
1185          long indexv, indexh;
1186          grp_info = EXT4_SB(sb)->s_group_info;
1187          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1188          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1189          return grp_info[indexv][indexh];
1190 }
1191
1192
1193 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1194                                              ext4_group_t block_group)
1195 {
1196         return block_group >> sbi->s_log_groups_per_flex;
1197 }
1198
1199 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1200 {
1201         return 1 << sbi->s_log_groups_per_flex;
1202 }
1203
1204 #define ext4_std_error(sb, errno)                               \
1205 do {                                                            \
1206         if ((errno))                                            \
1207                 __ext4_std_error((sb), __func__, (errno));      \
1208 } while (0)
1209
1210 /*
1211  * Inodes and files operations
1212  */
1213
1214 /* dir.c */
1215 extern const struct file_operations ext4_dir_operations;
1216
1217 /* file.c */
1218 extern const struct inode_operations ext4_file_inode_operations;
1219 extern const struct file_operations ext4_file_operations;
1220
1221 /* namei.c */
1222 extern const struct inode_operations ext4_dir_inode_operations;
1223 extern const struct inode_operations ext4_special_inode_operations;
1224
1225 /* symlink.c */
1226 extern const struct inode_operations ext4_symlink_inode_operations;
1227 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1228
1229 /* extents.c */
1230 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1231 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1232 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1233                                        int chunk);
1234 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1235                         ext4_lblk_t iblock,
1236                         unsigned long max_blocks, struct buffer_head *bh_result,
1237                         int create, int extend_disksize);
1238 extern void ext4_ext_truncate(struct inode *);
1239 extern void ext4_ext_init(struct super_block *);
1240 extern void ext4_ext_release(struct super_block *);
1241 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1242                           loff_t len);
1243 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1244                         sector_t block, unsigned long max_blocks,
1245                         struct buffer_head *bh, int create,
1246                         int extend_disksize, int flag);
1247 #endif  /* __KERNEL__ */
1248
1249 #endif  /* _EXT4_H */