fs/ext4/ext4.h

   1 /*
   2  *  ext4.h
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/include/linux/minix_fs.h
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _EXT4_H
  17 #define _EXT4_H
  18
  19 #include <linux/types.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/magic.h>
  22 #include <linux/jbd2.h>
  23 #include <linux/quota.h>
  24 #include "ext4_i.h"
  25
  26 /*
  27  * The fourth extended filesystem constants/structures
  28  */
  29
  30 /*
  31  * Define EXT4FS_DEBUG to produce debug messages
  32  */
  33 #undef EXT4FS_DEBUG
  34
  35 /*
  36  * Debug code
  37  */
  38 #ifdef EXT4FS_DEBUG
  39 #define ext4_debug(f, a...)                                             \
  40         do {                                                            \
  41                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  42                         __FILE__, __LINE__, __func__);                  \
  43                 printk(KERN_DEBUG f, ## a);                             \
  44         } while (0)
  45 #else
  46 #define ext4_debug(f, a...)     do {} while (0)
  47 #endif
  48
  49 /* prefer goal again. length */
  50 #define EXT4_MB_HINT_MERGE              1
  51 /* blocks already reserved */
  52 #define EXT4_MB_HINT_RESERVED           2
  53 /* metadata is being allocated */
  54 #define EXT4_MB_HINT_METADATA           4
  55 /* first blocks in the file */
  56 #define EXT4_MB_HINT_FIRST              8
  57 /* search for the best chunk */
  58 #define EXT4_MB_HINT_BEST               16
  59 /* data is being allocated */
  60 #define EXT4_MB_HINT_DATA               32
  61 /* don't preallocate (for tails) */
  62 #define EXT4_MB_HINT_NOPREALLOC         64
  63 /* allocate for locality group */
  64 #define EXT4_MB_HINT_GROUP_ALLOC        128
  65 /* allocate goal blocks or none */
  66 #define EXT4_MB_HINT_GOAL_ONLY          256
  67 /* goal is meaningful */
  68 #define EXT4_MB_HINT_TRY_GOAL           512
  69 /* blocks already pre-reserved by delayed allocation */
  70 #define EXT4_MB_DELALLOC_RESERVED      1024
  71
  72
  73 struct ext4_allocation_request {
  74         /* target inode for block we're allocating */
  75         struct inode *inode;
  76         /* logical block in target inode */
  77         ext4_lblk_t logical;
  78         /* phys. target (a hint) */
  79         ext4_fsblk_t goal;
  80         /* the closest logical allocated block to the left */
  81         ext4_lblk_t lleft;
  82         /* phys. block for ^^^ */
  83         ext4_fsblk_t pleft;
  84         /* the closest logical allocated block to the right */
  85         ext4_lblk_t lright;
  86         /* phys. block for ^^^ */
  87         ext4_fsblk_t pright;
  88         /* how many blocks we want to allocate */
  89         unsigned int len;
  90         /* flags. see above EXT4_MB_HINT_* */
  91         unsigned int flags;
  92 };
  93
  94 /*
  95  * Special inodes numbers
  96  */
  97 #define EXT4_BAD_INO             1      /* Bad blocks inode */
  98 #define EXT4_ROOT_INO            2      /* Root inode */
  99 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 100 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 101 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 102 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 103
 104 /* First non-reserved inode for old ext4 filesystems */
 105 #define EXT4_GOOD_OLD_FIRST_INO 11
 106
 107 /*
 108  * Maximal count of links to a file
 109  */
 110 #define EXT4_LINK_MAX           65000
 111
 112 /*
 113  * Macro-instructions used to manage several block sizes
 114  */
 115 #define EXT4_MIN_BLOCK_SIZE             1024
 116 #define EXT4_MAX_BLOCK_SIZE             65536
 117 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 118 #ifdef __KERNEL__
 119 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 120 #else
 121 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 122 #endif
 123 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 124 #ifdef __KERNEL__
 125 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 126 #else
 127 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 128 #endif
 129 #ifdef __KERNEL__
 130 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 131 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 132 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 133 #else
 134 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 135                                  EXT4_GOOD_OLD_INODE_SIZE : \
 136                                  (s)->s_inode_size)
 137 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 138                                  EXT4_GOOD_OLD_FIRST_INO : \
 139                                  (s)->s_first_ino)
 140 #endif
 141 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 142
 143 /*
 144  * Structure of a blocks group descriptor
 145  */
 146 struct ext4_group_desc
 147 {
 148         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 149         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 150         __le32  bg_inode_table_lo;      /* Inodes table block */
 151         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 152         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 153         __le16  bg_used_dirs_count_lo;  /* Directories count */
 154         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 155         __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */
 156         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 157         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 158         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 159         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 160         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 161         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 162         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 163         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 164         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 165         __u32   bg_reserved2[3];
 166 };
 167
 168 /*
 169  * Structure of a flex block group info
 170  */
 171
 172 struct flex_groups {
 173         __u32 free_inodes;
 174         __u32 free_blocks;
 175 };
 176
 177 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 178 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 179 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 180
 181 #ifdef __KERNEL__
 182 #include "ext4_sb.h"
 183 #endif
 184 /*
 185  * Macro-instructions used to manage group descriptors
 186  */
 187 #define EXT4_MIN_DESC_SIZE              32
 188 #define EXT4_MIN_DESC_SIZE_64BIT        64
 189 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 190 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 191 #ifdef __KERNEL__
 192 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 193 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 194 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 195 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 196 #else
 197 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 198 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 199 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 200 #endif
 201
 202 /*
 203  * Constants relative to the data blocks
 204  */
 205 #define EXT4_NDIR_BLOCKS                12
 206 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 207 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 208 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 209 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 210
 211 /*
 212  * Inode flags
 213  */
 214 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 215 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 216 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 217 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 218 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 219 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 220 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 221 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 222 /* Reserved for compression usage... */
 223 #define EXT4_DIRTY_FL                   0x00000100
 224 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 225 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 226 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 227 /* End compression flags --- maybe not all used */
 228 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 229 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 230 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 231 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 232 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 233 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 234 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 235 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 236 #define EXT4_EXT_MIGRATE                0x00100000 /* Inode is migrating */
 237 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 238
 239 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 240 #define EXT4_FL_USER_MODIFIABLE         0x000B80FF /* User modifiable flags */
 241
 242 /*
 243  * Inode dynamic state flags
 244  */
 245 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 246 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 247 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 248 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 249
 250 /* Used to pass group descriptor data when online resize is done */
 251 struct ext4_new_group_input {
 252         __u32 group;            /* Group number for this data */
 253         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 254         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 255         __u64 inode_table;      /* Absolute block number of inode table start */
 256         __u32 blocks_count;     /* Total number of blocks in this group */
 257         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 258         __u16 unused;
 259 };
 260
 261 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 262 struct ext4_new_group_data {
 263         __u32 group;
 264         __u64 block_bitmap;
 265         __u64 inode_bitmap;
 266         __u64 inode_table;
 267         __u32 blocks_count;
 268         __u16 reserved_blocks;
 269         __u16 unused;
 270         __u32 free_blocks_count;
 271 };
 272
 273 /*
 274  * Following is used by preallocation code to tell get_blocks() that we
 275  * want uninitialzed extents.
 276  */
 277 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 278
 279 /*
 280  * ioctl commands
 281  */
 282 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 283 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 284 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 285 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 286 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 287 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 288 #ifdef CONFIG_JBD2_DEBUG
 289 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 290 #endif
 291 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 292 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 293 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 294 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 295 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 296  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 297
 298 /*
 299  * ioctl commands in 32 bit emulation
 300  */
 301 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 302 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 303 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 304 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 305 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 306 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 307 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 308 #ifdef CONFIG_JBD2_DEBUG
 309 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 310 #endif
 311 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 312 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 313
 314
 315 /*
 316  *  Mount options
 317  */
 318 struct ext4_mount_options {
 319         unsigned long s_mount_opt;
 320         uid_t s_resuid;
 321         gid_t s_resgid;
 322         unsigned long s_commit_interval;
 323         u32 s_min_batch_time, s_max_batch_time;
 324 #ifdef CONFIG_QUOTA
 325         int s_jquota_fmt;
 326         char *s_qf_names[MAXQUOTAS];
 327 #endif
 328 };
 329
 330 /*
 331  * Structure of an inode on the disk
 332  */
 333 struct ext4_inode {
 334         __le16  i_mode;         /* File mode */
 335         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 336         __le32  i_size_lo;      /* Size in bytes */
 337         __le32  i_atime;        /* Access time */
 338         __le32  i_ctime;        /* Inode Change time */
 339         __le32  i_mtime;        /* Modification time */
 340         __le32  i_dtime;        /* Deletion Time */
 341         __le16  i_gid;          /* Low 16 bits of Group Id */
 342         __le16  i_links_count;  /* Links count */
 343         __le32  i_blocks_lo;    /* Blocks count */
 344         __le32  i_flags;        /* File flags */
 345         union {
 346                 struct {
 347                         __le32  l_i_version;
 348                 } linux1;
 349                 struct {
 350                         __u32  h_i_translator;
 351                 } hurd1;
 352                 struct {
 353                         __u32  m_i_reserved1;
 354                 } masix1;
 355         } osd1;                         /* OS dependent 1 */
 356         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 357         __le32  i_generation;   /* File version (for NFS) */
 358         __le32  i_file_acl_lo;  /* File ACL */
 359         __le32  i_size_high;
 360         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 361         union {
 362                 struct {
 363                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 364                         __le16  l_i_file_acl_high;
 365                         __le16  l_i_uid_high;   /* these 2 fields */
 366                         __le16  l_i_gid_high;   /* were reserved2[0] */
 367                         __u32   l_i_reserved2;
 368                 } linux2;
 369                 struct {
 370                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 371                         __u16   h_i_mode_high;
 372                         __u16   h_i_uid_high;
 373                         __u16   h_i_gid_high;
 374                         __u32   h_i_author;
 375                 } hurd2;
 376                 struct {
 377                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 378                         __le16  m_i_file_acl_high;
 379                         __u32   m_i_reserved2[2];
 380                 } masix2;
 381         } osd2;                         /* OS dependent 2 */
 382         __le16  i_extra_isize;
 383         __le16  i_pad1;
 384         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 385         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 386         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 387         __le32  i_crtime;       /* File Creation time */
 388         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 389         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 390 };
 391
 392
 393 #define EXT4_EPOCH_BITS 2
 394 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 395 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 396
 397 /*
 398  * Extended fields will fit into an inode if the filesystem was formatted
 399  * with large inodes (-I 256 or larger) and there are not currently any EAs
 400  * consuming all of the available space. For new inodes we always reserve
 401  * enough space for the kernel's known extended fields, but for inodes
 402  * created with an old kernel this might not have been the case. None of
 403  * the extended inode fields is critical for correct filesystem operation.
 404  * This macro checks if a certain field fits in the inode. Note that
 405  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 406  */
 407 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 408         ((offsetof(typeof(*ext4_inode), field) +        \
 409           sizeof((ext4_inode)->field))                  \
 410         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 411             (einode)->i_extra_isize))                   \
 412
 413 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 414 {
 415        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 416                            time->tv_sec >> 32 : 0) |
 417                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 418 }
 419
 420 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 421 {
 422        if (sizeof(time->tv_sec) > 4)
 423                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 424                                << 32;
 425        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 426 }
 427
 428 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 429 do {                                                                           \
 430         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 431         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 432                 (raw_inode)->xtime ## _extra =                                 \
 433                                 ext4_encode_extra_time(&(inode)->xtime);       \
 434 } while (0)
 435
 436 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 437 do {                                                                           \
 438         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 439                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 440         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 441                 (raw_inode)->xtime ## _extra =                                 \
 442                                 ext4_encode_extra_time(&(einode)->xtime);      \
 443 } while (0)
 444
 445 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 446 do {                                                                           \
 447         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 448         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 449                 ext4_decode_extra_time(&(inode)->xtime,                        \
 450                                        raw_inode->xtime ## _extra);            \
 451 } while (0)
 452
 453 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 454 do {                                                                           \
 455         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 456                 (einode)->xtime.tv_sec =                                       \
 457                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 458         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 459                 ext4_decode_extra_time(&(einode)->xtime,                       \
 460                                        raw_inode->xtime ## _extra);            \
 461 } while (0)
 462
 463 #define i_disk_version osd1.linux1.l_i_version
 464
 465 #if defined(__KERNEL__) || defined(__linux__)
 466 #define i_reserved1     osd1.linux1.l_i_reserved1
 467 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 468 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 469 #define i_uid_low       i_uid
 470 #define i_gid_low       i_gid
 471 #define i_uid_high      osd2.linux2.l_i_uid_high
 472 #define i_gid_high      osd2.linux2.l_i_gid_high
 473 #define i_reserved2     osd2.linux2.l_i_reserved2
 474
 475 #elif defined(__GNU__)
 476
 477 #define i_translator    osd1.hurd1.h_i_translator
 478 #define i_uid_high      osd2.hurd2.h_i_uid_high
 479 #define i_gid_high      osd2.hurd2.h_i_gid_high
 480 #define i_author        osd2.hurd2.h_i_author
 481
 482 #elif defined(__masix__)
 483
 484 #define i_reserved1     osd1.masix1.m_i_reserved1
 485 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 486 #define i_reserved2     osd2.masix2.m_i_reserved2
 487
 488 #endif /* defined(__KERNEL__) || defined(__linux__) */
 489
 490 /*
 491  * File system states
 492  */
 493 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 494 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 495 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 496
 497 /*
 498  * Misc. filesystem flags
 499  */
 500 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 501 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 502 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 503
 504 /*
 505  * Mount flags
 506  */
 507 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 508 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 509 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 510 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 511 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 512 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 513 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 514 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 515 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 516 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 517 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 518 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 519 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 520 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 521 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 522 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 523 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 524 #define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */
 525 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 526 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 527 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 528 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 529 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 530 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
 531 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 532 #define EXT4_MOUNT_I_VERSION            0x2000000 /* i_version support */
 533 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
 534 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
 535
 536 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 537 #ifndef _LINUX_EXT2_FS_H
 538 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 539 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 540 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 541                                          EXT4_MOUNT_##opt)
 542 #else
 543 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 544 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 545 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 546 #endif
 547
 548 #define ext4_set_bit                    ext2_set_bit
 549 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 550 #define ext4_clear_bit                  ext2_clear_bit
 551 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 552 #define ext4_test_bit                   ext2_test_bit
 553 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 554 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 555 #define ext4_find_next_bit              ext2_find_next_bit
 556
 557 /*
 558  * Maximal mount counts between two filesystem checks
 559  */
 560 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 561 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 562
 563 /*
 564  * Behaviour when detecting errors
 565  */
 566 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 567 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 568 #define EXT4_ERRORS_PANIC               3       /* Panic */
 569 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 570
 571 /*
 572  * Structure of the super block
 573  */
 574 struct ext4_super_block {
 575 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 576         __le32  s_blocks_count_lo;      /* Blocks count */
 577         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
 578         __le32  s_free_blocks_count_lo; /* Free blocks count */
 579 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 580         __le32  s_first_data_block;     /* First Data Block */
 581         __le32  s_log_block_size;       /* Block size */
 582         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 583 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 584         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 585         __le32  s_inodes_per_group;     /* # Inodes per group */
 586         __le32  s_mtime;                /* Mount time */
 587 /*30*/  __le32  s_wtime;                /* Write time */
 588         __le16  s_mnt_count;            /* Mount count */
 589         __le16  s_max_mnt_count;        /* Maximal mount count */
 590         __le16  s_magic;                /* Magic signature */
 591         __le16  s_state;                /* File system state */
 592         __le16  s_errors;               /* Behaviour when detecting errors */
 593         __le16  s_minor_rev_level;      /* minor revision level */
 594 /*40*/  __le32  s_lastcheck;            /* time of last check */
 595         __le32  s_checkinterval;        /* max. time between checks */
 596         __le32  s_creator_os;           /* OS */
 597         __le32  s_rev_level;            /* Revision level */
 598 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 599         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 600         /*
 601          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 602          *
 603          * Note: the difference between the compatible feature set and
 604          * the incompatible feature set is that if there is a bit set
 605          * in the incompatible feature set that the kernel doesn't
 606          * know about, it should refuse to mount the filesystem.
 607          *
 608          * e2fsck's requirements are more strict; if it doesn't know
 609          * about a feature in either the compatible or incompatible
 610          * feature set, it must abort and not try to meddle with
 611          * things it doesn't understand...
 612          */
 613         __le32  s_first_ino;            /* First non-reserved inode */
 614         __le16  s_inode_size;           /* size of inode structure */
 615         __le16  s_block_group_nr;       /* block group # of this superblock */
 616         __le32  s_feature_compat;       /* compatible feature set */
 617 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 618         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 619 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 620 /*78*/  char    s_volume_name[16];      /* volume name */
 621 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 622 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 623         /*
 624          * Performance hints.  Directory preallocation should only
 625          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 626          */
 627         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 628         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 629         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 630         /*
 631          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 632          */
 633 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 634 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 635         __le32  s_journal_dev;          /* device number of journal file */
 636         __le32  s_last_orphan;          /* start of list of inodes to delete */
 637         __le32  s_hash_seed[4];         /* HTREE hash seed */
 638         __u8    s_def_hash_version;     /* Default hash version to use */
 639         __u8    s_reserved_char_pad;
 640         __le16  s_desc_size;            /* size of group descriptor */
 641 /*100*/ __le32  s_default_mount_opts;
 642         __le32  s_first_meta_bg;        /* First metablock block group */
 643         __le32  s_mkfs_time;            /* When the filesystem was created */
 644         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 645         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 646 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 647         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 648         __le32  s_free_blocks_count_hi; /* Free blocks count */
 649         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
 650         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
 651         __le32  s_flags;                /* Miscellaneous flags */
 652         __le16  s_raid_stride;          /* RAID stride */
 653         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
 654         __le64  s_mmp_block;            /* Block for multi-mount protection */
 655         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 656         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
 657         __u8    s_reserved_char_pad2;
 658         __le16  s_reserved_pad;
 659         __u32   s_reserved[162];        /* Padding to the end of the block */
 660 };
 661
 662 #ifdef __KERNEL__
 663 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
 664 {
 665         return sb->s_fs_info;
 666 }
 667 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 668 {
 669         return container_of(inode, struct ext4_inode_info, vfs_inode);
 670 }
 671
 672 static inline struct timespec ext4_current_time(struct inode *inode)
 673 {
 674         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 675                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 676 }
 677
 678
 679 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 680 {
 681         return ino == EXT4_ROOT_INO ||
 682                 ino == EXT4_JOURNAL_INO ||
 683                 ino == EXT4_RESIZE_INO ||
 684                 (ino >= EXT4_FIRST_INO(sb) &&
 685                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 686 }
 687 #else
 688 /* Assume that user mode programs are passing in an ext4fs superblock, not
 689  * a kernel struct super_block.  This will allow us to call the feature-test
 690  * macros from user land. */
 691 #define EXT4_SB(sb)     (sb)
 692 #endif
 693
 694 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 695
 696 /*
 697  * Codes for operating systems
 698  */
 699 #define EXT4_OS_LINUX           0
 700 #define EXT4_OS_HURD            1
 701 #define EXT4_OS_MASIX           2
 702 #define EXT4_OS_FREEBSD         3
 703 #define EXT4_OS_LITES           4
 704
 705 /*
 706  * Revision levels
 707  */
 708 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 709 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 710
 711 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 712 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 713
 714 #define EXT4_GOOD_OLD_INODE_SIZE 128
 715
 716 /*
 717  * Feature set definitions
 718  */
 719
 720 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 721         ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
 722 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 723         ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
 724 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 725         ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
 726 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 727         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 728 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 729         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 730 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 731         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 732 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 733         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 734 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 735         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 736 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 737         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 738
 739 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 740 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 741 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 742 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 743 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 744 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 745
 746 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 747 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 748 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 749 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
 750 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
 751 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 752 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 753
 754 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 755 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 756 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 757 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 758 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 759 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 760 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 761 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
 762 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
 763
 764 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 765 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 766                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 767                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 768                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 769                                          EXT4_FEATURE_INCOMPAT_64BIT| \
 770                                          EXT4_FEATURE_INCOMPAT_FLEX_BG)
 771 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 772                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 773                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
 774                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 775                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 776                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
 777                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
 778
 779 /*
 780  * Default values for user and/or group using reserved blocks
 781  */
 782 #define EXT4_DEF_RESUID         0
 783 #define EXT4_DEF_RESGID         0
 784
 785 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
 786
 787 /*
 788  * Default mount options
 789  */
 790 #define EXT4_DEFM_DEBUG         0x0001
 791 #define EXT4_DEFM_BSDGROUPS     0x0002
 792 #define EXT4_DEFM_XATTR_USER    0x0004
 793 #define EXT4_DEFM_ACL           0x0008
 794 #define EXT4_DEFM_UID16         0x0010
 795 #define EXT4_DEFM_JMODE         0x0060
 796 #define EXT4_DEFM_JMODE_DATA    0x0020
 797 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 798 #define EXT4_DEFM_JMODE_WBACK   0x0060
 799
 800 /*
 801  * Default journal batch times
 802  */
 803 #define EXT4_DEF_MIN_BATCH_TIME 0
 804 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
 805
 806 /*
 807  * Structure of a directory entry
 808  */
 809 #define EXT4_NAME_LEN 255
 810
 811 struct ext4_dir_entry {
 812         __le32  inode;                  /* Inode number */
 813         __le16  rec_len;                /* Directory entry length */
 814         __le16  name_len;               /* Name length */
 815         char    name[EXT4_NAME_LEN];    /* File name */
 816 };
 817
 818 /*
 819  * The new version of the directory entry.  Since EXT4 structures are
 820  * stored in intel byte order, and the name_len field could never be
 821  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 822  * file_type field.
 823  */
 824 struct ext4_dir_entry_2 {
 825         __le32  inode;                  /* Inode number */
 826         __le16  rec_len;                /* Directory entry length */
 827         __u8    name_len;               /* Name length */
 828         __u8    file_type;
 829         char    name[EXT4_NAME_LEN];    /* File name */
 830 };
 831
 832 /*
 833  * Ext4 directory file types.  Only the low 3 bits are used.  The
 834  * other bits are reserved for now.
 835  */
 836 #define EXT4_FT_UNKNOWN         0
 837 #define EXT4_FT_REG_FILE        1
 838 #define EXT4_FT_DIR             2
 839 #define EXT4_FT_CHRDEV          3
 840 #define EXT4_FT_BLKDEV          4
 841 #define EXT4_FT_FIFO            5
 842 #define EXT4_FT_SOCK            6
 843 #define EXT4_FT_SYMLINK         7
 844
 845 #define EXT4_FT_MAX             8
 846
 847 /*
 848  * EXT4_DIR_PAD defines the directory entries boundaries
 849  *
 850  * NOTE: It must be a multiple of 4
 851  */
 852 #define EXT4_DIR_PAD                    4
 853 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
 854 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
 855                                          ~EXT4_DIR_ROUND)
 856 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
 857
 858 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
 859 {
 860         unsigned len = le16_to_cpu(dlen);
 861
 862         if (len == EXT4_MAX_REC_LEN || len == 0)
 863                 return 1 << 16;
 864         return len;
 865 }
 866
 867 static inline __le16 ext4_rec_len_to_disk(unsigned len)
 868 {
 869         if (len == (1 << 16))
 870                 return cpu_to_le16(EXT4_MAX_REC_LEN);
 871         else if (len > (1 << 16))
 872                 BUG();
 873         return cpu_to_le16(len);
 874 }
 875
 876 /*
 877  * Hash Tree Directory indexing
 878  * (c) Daniel Phillips, 2001
 879  */
 880
 881 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
 882                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
 883                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 884 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 885 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 886
 887 /* Legal values for the dx_root hash_version field: */
 888
 889 #define DX_HASH_LEGACY          0
 890 #define DX_HASH_HALF_MD4        1
 891 #define DX_HASH_TEA             2
 892 #define DX_HASH_LEGACY_UNSIGNED 3
 893 #define DX_HASH_HALF_MD4_UNSIGNED       4
 894 #define DX_HASH_TEA_UNSIGNED            5
 895
 896 #ifdef __KERNEL__
 897
 898 /* hash info structure used by the directory hash */
 899 struct dx_hash_info
 900 {
 901         u32             hash;
 902         u32             minor_hash;
 903         int             hash_version;
 904         u32             *seed;
 905 };
 906
 907 #define EXT4_HTREE_EOF  0x7fffffff
 908
 909 /*
 910  * Control parameters used by ext4_htree_next_block
 911  */
 912 #define HASH_NB_ALWAYS          1
 913
 914
 915 /*
 916  * Describe an inode's exact location on disk and in memory
 917  */
 918 struct ext4_iloc
 919 {
 920         struct buffer_head *bh;
 921         unsigned long offset;
 922         ext4_group_t block_group;
 923 };
 924
 925 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 926 {
 927         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 928 }
 929
 930 /*
 931  * This structure is stuffed into the struct file's private_data field
 932  * for directories.  It is where we put information so that we can do
 933  * readdir operations in hash tree order.
 934  */
 935 struct dir_private_info {
 936         struct rb_root  root;
 937         struct rb_node  *curr_node;
 938         struct fname    *extra_fname;
 939         loff_t          last_pos;
 940         __u32           curr_hash;
 941         __u32           curr_minor_hash;
 942         __u32           next_hash;
 943 };
 944
 945 /* calculate the first block number of the group */
 946 static inline ext4_fsblk_t
 947 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
 948 {
 949         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
 950                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 951 }
 952
 953 /*
 954  * Special error return code only used by dx_probe() and its callers.
 955  */
 956 #define ERR_BAD_DX_DIR  -75000
 957
 958 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 959                         ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
 960
 961 extern struct proc_dir_entry *ext4_proc_root;
 962
 963 #ifdef CONFIG_PROC_FS
 964 extern const struct file_operations ext4_ui_proc_fops;
 965
 966 #define EXT4_PROC_HANDLER(name, var)                                    \
 967 do {                                                                    \
 968         proc = proc_create_data(name, mode, sbi->s_proc,                \
 969                                 &ext4_ui_proc_fops, &sbi->s_##var);     \
 970         if (proc == NULL) {                                             \
 971                 printk(KERN_ERR "EXT4-fs: can't create %s\n", name);    \
 972                 goto err_out;                                           \
 973         }                                                               \
 974 } while (0)
 975 #else
 976 #define EXT4_PROC_HANDLER(name, var)
 977 #endif
 978
 979 /*
 980  * Function prototypes
 981  */
 982
 983 /*
 984  * Ok, these declarations are also in <linux/kernel.h> but none of the
 985  * ext4 source programs needs to include it so they are duplicated here.
 986  */
 987 # define NORET_TYPE     /**/
 988 # define ATTRIB_NORET   __attribute__((noreturn))
 989 # define NORET_AND      noreturn,
 990
 991 /* bitmap.c */
 992 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
 993
 994 /* balloc.c */
 995 extern unsigned int ext4_block_group(struct super_block *sb,
 996                         ext4_fsblk_t blocknr);
 997 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 998                         ext4_fsblk_t blocknr);
 999 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1000 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1001                         ext4_group_t group);
1002 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1003                         ext4_fsblk_t goal, unsigned long *count, int *errp);
1004 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1005 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1006 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1007                         ext4_fsblk_t block, unsigned long count, int metadata);
1008 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1009                                 ext4_fsblk_t block, unsigned long count);
1010 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1011 extern void ext4_check_blocks_bitmap(struct super_block *);
1012 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1013                                                     ext4_group_t block_group,
1014                                                     struct buffer_head ** bh);
1015 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1016
1017 /* dir.c */
1018 extern int ext4_check_dir_entry(const char *, struct inode *,
1019                                 struct ext4_dir_entry_2 *,
1020                                 struct buffer_head *, unsigned int);
1021 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1022                                     __u32 minor_hash,
1023                                     struct ext4_dir_entry_2 *dirent);
1024 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1025
1026 /* fsync.c */
1027 extern int ext4_sync_file(struct file *, struct dentry *, int);
1028
1029 /* hash.c */
1030 extern int ext4fs_dirhash(const char *name, int len, struct
1031                           dx_hash_info *hinfo);
1032
1033 /* ialloc.c */
1034 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1035 extern void ext4_free_inode(handle_t *, struct inode *);
1036 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1037 extern unsigned long ext4_count_free_inodes(struct super_block *);
1038 extern unsigned long ext4_count_dirs(struct super_block *);
1039 extern void ext4_check_inodes_bitmap(struct super_block *);
1040
1041 /* mballoc.c */
1042 extern long ext4_mb_stats;
1043 extern long ext4_mb_max_to_scan;
1044 extern int ext4_mb_init(struct super_block *, int);
1045 extern int ext4_mb_release(struct super_block *);
1046 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1047                                 struct ext4_allocation_request *, int *);
1048 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1049 extern void ext4_discard_preallocations(struct inode *);
1050 extern int __init init_ext4_mballoc(void);
1051 extern void exit_ext4_mballoc(void);
1052 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1053                 unsigned long, unsigned long, int, unsigned long *);
1054 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1055                 ext4_group_t i, struct ext4_group_desc *desc);
1056 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1057                 ext4_grpblk_t add);
1058 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1059 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1060                                                 ext4_group_t, int);
1061 /* inode.c */
1062 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1063                 struct buffer_head *bh, ext4_fsblk_t blocknr);
1064 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1065                                                 ext4_lblk_t, int, int *);
1066 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1067                                                 ext4_lblk_t, int, int *);
1068 int ext4_get_block(struct inode *inode, sector_t iblock,
1069                                 struct buffer_head *bh_result, int create);
1070
1071 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1072 extern int  ext4_write_inode(struct inode *, int);
1073 extern int  ext4_setattr(struct dentry *, struct iattr *);
1074 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1075                                 struct kstat *stat);
1076 extern void ext4_delete_inode(struct inode *);
1077 extern int  ext4_sync_inode(handle_t *, struct inode *);
1078 extern void ext4_dirty_inode(struct inode *);
1079 extern int ext4_change_inode_journal_flag(struct inode *, int);
1080 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1081 extern int ext4_can_truncate(struct inode *inode);
1082 extern void ext4_truncate(struct inode *);
1083 extern void ext4_set_inode_flags(struct inode *);
1084 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1085 extern void ext4_set_aops(struct inode *inode);
1086 extern int ext4_writepage_trans_blocks(struct inode *);
1087 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1088 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1089 extern int ext4_block_truncate_page(handle_t *handle,
1090                 struct address_space *mapping, loff_t from);
1091 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1092 extern qsize_t ext4_get_reserved_space(struct inode *inode);
1093
1094 /* ioctl.c */
1095 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1096 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1097
1098 /* migrate.c */
1099 extern int ext4_ext_migrate(struct inode *);
1100 /* namei.c */
1101 extern int ext4_orphan_add(handle_t *, struct inode *);
1102 extern int ext4_orphan_del(handle_t *, struct inode *);
1103 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1104                                 __u32 start_minor_hash, __u32 *next_hash);
1105
1106 /* resize.c */
1107 extern int ext4_group_add(struct super_block *sb,
1108                                 struct ext4_new_group_data *input);
1109 extern int ext4_group_extend(struct super_block *sb,
1110                                 struct ext4_super_block *es,
1111                                 ext4_fsblk_t n_blocks_count);
1112
1113 /* super.c */
1114 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1115         __attribute__ ((format (printf, 3, 4)));
1116 extern void __ext4_std_error(struct super_block *, const char *, int);
1117 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1118         __attribute__ ((format (printf, 3, 4)));
1119 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1120         __attribute__ ((format (printf, 3, 4)));
1121 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1122                                 const char *, const char *, ...)
1123         __attribute__ ((format (printf, 4, 5)));
1124 extern void ext4_update_dynamic_rev(struct super_block *sb);
1125 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1126                                         __u32 compat);
1127 extern int ext4_update_rocompat_feature(handle_t *handle,
1128                                         struct super_block *sb, __u32 rocompat);
1129 extern int ext4_update_incompat_feature(handle_t *handle,
1130                                         struct super_block *sb, __u32 incompat);
1131 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1132                                       struct ext4_group_desc *bg);
1133 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1134                                       struct ext4_group_desc *bg);
1135 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1136                                      struct ext4_group_desc *bg);
1137 extern __u32 ext4_free_blks_count(struct super_block *sb,
1138                                 struct ext4_group_desc *bg);
1139 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1140                                  struct ext4_group_desc *bg);
1141 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1142                                 struct ext4_group_desc *bg);
1143 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1144                                    struct ext4_group_desc *bg);
1145 extern void ext4_block_bitmap_set(struct super_block *sb,
1146                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1147 extern void ext4_inode_bitmap_set(struct super_block *sb,
1148                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1149 extern void ext4_inode_table_set(struct super_block *sb,
1150                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1151 extern void ext4_free_blks_set(struct super_block *sb,
1152                                struct ext4_group_desc *bg, __u32 count);
1153 extern void ext4_free_inodes_set(struct super_block *sb,
1154                                 struct ext4_group_desc *bg, __u32 count);
1155 extern void ext4_used_dirs_set(struct super_block *sb,
1156                                 struct ext4_group_desc *bg, __u32 count);
1157 extern void ext4_itable_unused_set(struct super_block *sb,
1158                                    struct ext4_group_desc *bg, __u32 count);
1159
1160 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1161 {
1162         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1163                 le32_to_cpu(es->s_blocks_count_lo);
1164 }
1165
1166 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1167 {
1168         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1169                 le32_to_cpu(es->s_r_blocks_count_lo);
1170 }
1171
1172 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1173 {
1174         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1175                 le32_to_cpu(es->s_free_blocks_count_lo);
1176 }
1177
1178 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1179                                          ext4_fsblk_t blk)
1180 {
1181         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1182         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1183 }
1184
1185 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1186                                               ext4_fsblk_t blk)
1187 {
1188         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1189         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1190 }
1191
1192 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1193                                            ext4_fsblk_t blk)
1194 {
1195         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1196         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1197 }
1198
1199 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1200 {
1201         if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1202                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1203                         le32_to_cpu(raw_inode->i_size_lo);
1204         else
1205                 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1206 }
1207
1208 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1209 {
1210         raw_inode->i_size_lo = cpu_to_le32(i_size);
1211         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1212 }
1213
1214 static inline
1215 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1216                                             ext4_group_t group)
1217 {
1218          struct ext4_group_info ***grp_info;
1219          long indexv, indexh;
1220          grp_info = EXT4_SB(sb)->s_group_info;
1221          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1222          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1223          return grp_info[indexv][indexh];
1224 }
1225
1226
1227 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1228                                              ext4_group_t block_group)
1229 {
1230         return block_group >> sbi->s_log_groups_per_flex;
1231 }
1232
1233 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1234 {
1235         return 1 << sbi->s_log_groups_per_flex;
1236 }
1237
1238 #define ext4_std_error(sb, errno)                               \
1239 do {                                                            \
1240         if ((errno))                                            \
1241                 __ext4_std_error((sb), __func__, (errno));      \
1242 } while (0)
1243
1244 #ifdef CONFIG_SMP
1245 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1246  * counters. So we need to make sure we have free blocks more
1247  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
1248  */
1249 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1250 #else
1251 #define EXT4_FREEBLOCKS_WATERMARK 0
1252 #endif
1253
1254 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1255 {
1256         /*
1257          * XXX: replace with spinlock if seen contended -bzzz
1258          */
1259         down_write(&EXT4_I(inode)->i_data_sem);
1260         if (newsize > EXT4_I(inode)->i_disksize)
1261                 EXT4_I(inode)->i_disksize = newsize;
1262         up_write(&EXT4_I(inode)->i_data_sem);
1263         return ;
1264 }
1265
1266 struct ext4_group_info {
1267         unsigned long   bb_state;
1268         struct rb_root  bb_free_root;
1269         unsigned short  bb_first_free;
1270         unsigned short  bb_free;
1271         unsigned short  bb_fragments;
1272         struct          list_head bb_prealloc_list;
1273 #ifdef DOUBLE_CHECK
1274         void            *bb_bitmap;
1275 #endif
1276         struct rw_semaphore alloc_sem;
1277         unsigned short  bb_counters[];
1278 };
1279
1280 #define EXT4_GROUP_INFO_NEED_INIT_BIT   0
1281 #define EXT4_GROUP_INFO_LOCKED_BIT      1
1282
1283 #define EXT4_MB_GRP_NEED_INIT(grp)      \
1284         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1285
1286 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1287 {
1288         struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1289
1290         bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1291 }
1292
1293 static inline void ext4_unlock_group(struct super_block *sb,
1294                                         ext4_group_t group)
1295 {
1296         struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1297
1298         bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1299 }
1300
1301 static inline int ext4_is_group_locked(struct super_block *sb,
1302                                         ext4_group_t group)
1303 {
1304         struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1305
1306         return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
1307                                                 &(grinfo->bb_state));
1308 }
1309
1310 /*
1311  * Inodes and files operations
1312  */
1313
1314 /* dir.c */
1315 extern const struct file_operations ext4_dir_operations;
1316
1317 /* file.c */
1318 extern const struct inode_operations ext4_file_inode_operations;
1319 extern const struct file_operations ext4_file_operations;
1320
1321 /* namei.c */
1322 extern const struct inode_operations ext4_dir_inode_operations;
1323 extern const struct inode_operations ext4_special_inode_operations;
1324
1325 /* symlink.c */
1326 extern const struct inode_operations ext4_symlink_inode_operations;
1327 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1328
1329 /* extents.c */
1330 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1331 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1332 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1333                                        int chunk);
1334 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1335                                ext4_lblk_t iblock, unsigned int max_blocks,
1336                                struct buffer_head *bh_result,
1337                                int create, int extend_disksize);
1338 extern void ext4_ext_truncate(struct inode *);
1339 extern void ext4_ext_init(struct super_block *);
1340 extern void ext4_ext_release(struct super_block *);
1341 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1342                           loff_t len);
1343 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1344                         sector_t block, unsigned int max_blocks,
1345                         struct buffer_head *bh, int create,
1346                         int extend_disksize, int flag);
1347 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1348                         __u64 start, __u64 len);
1349
1350 /*
1351  * Add new method to test wether block and inode bitmaps are properly
1352  * initialized. With uninit_bg reading the block from disk is not enough
1353  * to mark the bitmap uptodate. We need to also zero-out the bitmap
1354  */
1355 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1356
1357 static inline int bitmap_uptodate(struct buffer_head *bh)
1358 {
1359         return (buffer_uptodate(bh) &&
1360                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1361 }
1362 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1363 {
1364         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1365 }
1366
1367 #endif  /* __KERNEL__ */
1368
1369 #endif  /* _EXT4_H */