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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         0x000B80FF /* 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_GETVERSION_OLD         FS_IOC_GETVERSION
 295 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 296 #ifdef CONFIG_JBD2_DEBUG
 297 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 298 #endif
 299 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 300 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 301 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 302 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 303 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 304  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 305
 306 /*
 307  * ioctl commands in 32 bit emulation
 308  */
 309 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 310 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 311 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 312 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 313 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 314 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 315 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 316 #ifdef CONFIG_JBD2_DEBUG
 317 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 318 #endif
 319 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 320 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 321
 322
 323 /*
 324  *  Mount options
 325  */
 326 struct ext4_mount_options {
 327         unsigned long s_mount_opt;
 328         uid_t s_resuid;
 329         gid_t s_resgid;
 330         unsigned long s_commit_interval;
 331 #ifdef CONFIG_QUOTA
 332         int s_jquota_fmt;
 333         char *s_qf_names[MAXQUOTAS];
 334 #endif
 335 };
 336
 337 /*
 338  * Structure of an inode on the disk
 339  */
 340 struct ext4_inode {
 341         __le16  i_mode;         /* File mode */
 342         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 343         __le32  i_size_lo;      /* Size in bytes */
 344         __le32  i_atime;        /* Access time */
 345         __le32  i_ctime;        /* Inode Change time */
 346         __le32  i_mtime;        /* Modification time */
 347         __le32  i_dtime;        /* Deletion Time */
 348         __le16  i_gid;          /* Low 16 bits of Group Id */
 349         __le16  i_links_count;  /* Links count */
 350         __le32  i_blocks_lo;    /* Blocks count */
 351         __le32  i_flags;        /* File flags */
 352         union {
 353                 struct {
 354                         __le32  l_i_version;
 355                 } linux1;
 356                 struct {
 357                         __u32  h_i_translator;
 358                 } hurd1;
 359                 struct {
 360                         __u32  m_i_reserved1;
 361                 } masix1;
 362         } osd1;                         /* OS dependent 1 */
 363         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 364         __le32  i_generation;   /* File version (for NFS) */
 365         __le32  i_file_acl_lo;  /* File ACL */
 366         __le32  i_size_high;
 367         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 368         union {
 369                 struct {
 370                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 371                         __le16  l_i_file_acl_high;
 372                         __le16  l_i_uid_high;   /* these 2 fields */
 373                         __le16  l_i_gid_high;   /* were reserved2[0] */
 374                         __u32   l_i_reserved2;
 375                 } linux2;
 376                 struct {
 377                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 378                         __u16   h_i_mode_high;
 379                         __u16   h_i_uid_high;
 380                         __u16   h_i_gid_high;
 381                         __u32   h_i_author;
 382                 } hurd2;
 383                 struct {
 384                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 385                         __le16  m_i_file_acl_high;
 386                         __u32   m_i_reserved2[2];
 387                 } masix2;
 388         } osd2;                         /* OS dependent 2 */
 389         __le16  i_extra_isize;
 390         __le16  i_pad1;
 391         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 392         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 393         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 394         __le32  i_crtime;       /* File Creation time */
 395         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 396         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 397 };
 398
 399
 400 #define EXT4_EPOCH_BITS 2
 401 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 402 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 403
 404 /*
 405  * Extended fields will fit into an inode if the filesystem was formatted
 406  * with large inodes (-I 256 or larger) and there are not currently any EAs
 407  * consuming all of the available space. For new inodes we always reserve
 408  * enough space for the kernel's known extended fields, but for inodes
 409  * created with an old kernel this might not have been the case. None of
 410  * the extended inode fields is critical for correct filesystem operation.
 411  * This macro checks if a certain field fits in the inode. Note that
 412  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 413  */
 414 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 415         ((offsetof(typeof(*ext4_inode), field) +        \
 416           sizeof((ext4_inode)->field))                  \
 417         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 418             (einode)->i_extra_isize))                   \
 419
 420 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 421 {
 422        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 423                            time->tv_sec >> 32 : 0) |
 424                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 425 }
 426
 427 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 428 {
 429        if (sizeof(time->tv_sec) > 4)
 430                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 431                                << 32;
 432        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 433 }
 434
 435 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 436 do {                                                                           \
 437         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 438         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 439                 (raw_inode)->xtime ## _extra =                                 \
 440                                 ext4_encode_extra_time(&(inode)->xtime);       \
 441 } while (0)
 442
 443 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 444 do {                                                                           \
 445         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 446                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 447         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 448                 (raw_inode)->xtime ## _extra =                                 \
 449                                 ext4_encode_extra_time(&(einode)->xtime);      \
 450 } while (0)
 451
 452 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 453 do {                                                                           \
 454         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 455         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 456                 ext4_decode_extra_time(&(inode)->xtime,                        \
 457                                        raw_inode->xtime ## _extra);            \
 458 } while (0)
 459
 460 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 461 do {                                                                           \
 462         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 463                 (einode)->xtime.tv_sec =                                       \
 464                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 465         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 466                 ext4_decode_extra_time(&(einode)->xtime,                       \
 467                                        raw_inode->xtime ## _extra);            \
 468 } while (0)
 469
 470 #define i_disk_version osd1.linux1.l_i_version
 471
 472 #if defined(__KERNEL__) || defined(__linux__)
 473 #define i_reserved1     osd1.linux1.l_i_reserved1
 474 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 475 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 476 #define i_uid_low       i_uid
 477 #define i_gid_low       i_gid
 478 #define i_uid_high      osd2.linux2.l_i_uid_high
 479 #define i_gid_high      osd2.linux2.l_i_gid_high
 480 #define i_reserved2     osd2.linux2.l_i_reserved2
 481
 482 #elif defined(__GNU__)
 483
 484 #define i_translator    osd1.hurd1.h_i_translator
 485 #define i_uid_high      osd2.hurd2.h_i_uid_high
 486 #define i_gid_high      osd2.hurd2.h_i_gid_high
 487 #define i_author        osd2.hurd2.h_i_author
 488
 489 #elif defined(__masix__)
 490
 491 #define i_reserved1     osd1.masix1.m_i_reserved1
 492 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 493 #define i_reserved2     osd2.masix2.m_i_reserved2
 494
 495 #endif /* defined(__KERNEL__) || defined(__linux__) */
 496
 497 /*
 498  * File system states
 499  */
 500 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 501 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 502 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 503
 504 /*
 505  * Misc. filesystem flags
 506  */
 507 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 508 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 509 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 510
 511 /*
 512  * Mount flags
 513  */
 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_DELALLOC             0x8000000 /* Delalloc support */
 542 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
 543
 544 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 545 #ifndef _LINUX_EXT2_FS_H
 546 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 547 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 548 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 549                                          EXT4_MOUNT_##opt)
 550 #else
 551 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 552 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 553 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 554 #endif
 555
 556 #define ext4_set_bit                    ext2_set_bit
 557 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 558 #define ext4_clear_bit                  ext2_clear_bit
 559 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 560 #define ext4_test_bit                   ext2_test_bit
 561 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 562 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 563 #define ext4_find_next_bit              ext2_find_next_bit
 564
 565 /*
 566  * Maximal mount counts between two filesystem checks
 567  */
 568 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 569 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 570
 571 /*
 572  * Behaviour when detecting errors
 573  */
 574 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 575 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 576 #define EXT4_ERRORS_PANIC               3       /* Panic */
 577 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 578
 579 /*
 580  * Structure of the super block
 581  */
 582 struct ext4_super_block {
 583 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 584         __le32  s_blocks_count_lo;      /* Blocks count */
 585         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
 586         __le32  s_free_blocks_count_lo; /* Free blocks count */
 587 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 588         __le32  s_first_data_block;     /* First Data Block */
 589         __le32  s_log_block_size;       /* Block size */
 590         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 591 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 592         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 593         __le32  s_inodes_per_group;     /* # Inodes per group */
 594         __le32  s_mtime;                /* Mount time */
 595 /*30*/  __le32  s_wtime;                /* Write time */
 596         __le16  s_mnt_count;            /* Mount count */
 597         __le16  s_max_mnt_count;        /* Maximal mount count */
 598         __le16  s_magic;                /* Magic signature */
 599         __le16  s_state;                /* File system state */
 600         __le16  s_errors;               /* Behaviour when detecting errors */
 601         __le16  s_minor_rev_level;      /* minor revision level */
 602 /*40*/  __le32  s_lastcheck;            /* time of last check */
 603         __le32  s_checkinterval;        /* max. time between checks */
 604         __le32  s_creator_os;           /* OS */
 605         __le32  s_rev_level;            /* Revision level */
 606 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 607         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 608         /*
 609          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 610          *
 611          * Note: the difference between the compatible feature set and
 612          * the incompatible feature set is that if there is a bit set
 613          * in the incompatible feature set that the kernel doesn't
 614          * know about, it should refuse to mount the filesystem.
 615          *
 616          * e2fsck's requirements are more strict; if it doesn't know
 617          * about a feature in either the compatible or incompatible
 618          * feature set, it must abort and not try to meddle with
 619          * things it doesn't understand...
 620          */
 621         __le32  s_first_ino;            /* First non-reserved inode */
 622         __le16  s_inode_size;           /* size of inode structure */
 623         __le16  s_block_group_nr;       /* block group # of this superblock */
 624         __le32  s_feature_compat;       /* compatible feature set */
 625 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 626         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 627 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 628 /*78*/  char    s_volume_name[16];      /* volume name */
 629 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 630 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 631         /*
 632          * Performance hints.  Directory preallocation should only
 633          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 634          */
 635         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 636         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 637         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 638         /*
 639          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 640          */
 641 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 642 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 643         __le32  s_journal_dev;          /* device number of journal file */
 644         __le32  s_last_orphan;          /* start of list of inodes to delete */
 645         __le32  s_hash_seed[4];         /* HTREE hash seed */
 646         __u8    s_def_hash_version;     /* Default hash version to use */
 647         __u8    s_reserved_char_pad;
 648         __le16  s_desc_size;            /* size of group descriptor */
 649 /*100*/ __le32  s_default_mount_opts;
 650         __le32  s_first_meta_bg;        /* First metablock block group */
 651         __le32  s_mkfs_time;            /* When the filesystem was created */
 652         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 653         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 654 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 655         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 656         __le32  s_free_blocks_count_hi; /* Free blocks count */
 657         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
 658         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
 659         __le32  s_flags;                /* Miscellaneous flags */
 660         __le16  s_raid_stride;          /* RAID stride */
 661         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
 662         __le64  s_mmp_block;            /* Block for multi-mount protection */
 663         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 664         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
 665         __u8    s_reserved_char_pad2;
 666         __le16  s_reserved_pad;
 667         __u32   s_reserved[162];        /* Padding to the end of the block */
 668 };
 669
 670 #ifdef __KERNEL__
 671 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
 672 {
 673         return sb->s_fs_info;
 674 }
 675 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 676 {
 677         return container_of(inode, struct ext4_inode_info, vfs_inode);
 678 }
 679
 680 static inline struct timespec ext4_current_time(struct inode *inode)
 681 {
 682         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 683                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 684 }
 685
 686
 687 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 688 {
 689         return ino == EXT4_ROOT_INO ||
 690                 ino == EXT4_JOURNAL_INO ||
 691                 ino == EXT4_RESIZE_INO ||
 692                 (ino >= EXT4_FIRST_INO(sb) &&
 693                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 694 }
 695 #else
 696 /* Assume that user mode programs are passing in an ext4fs superblock, not
 697  * a kernel struct super_block.  This will allow us to call the feature-test
 698  * macros from user land. */
 699 #define EXT4_SB(sb)     (sb)
 700 #endif
 701
 702 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 703
 704 /*
 705  * Codes for operating systems
 706  */
 707 #define EXT4_OS_LINUX           0
 708 #define EXT4_OS_HURD            1
 709 #define EXT4_OS_MASIX           2
 710 #define EXT4_OS_FREEBSD         3
 711 #define EXT4_OS_LITES           4
 712
 713 /*
 714  * Revision levels
 715  */
 716 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 717 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 718
 719 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 720 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 721
 722 #define EXT4_GOOD_OLD_INODE_SIZE 128
 723
 724 /*
 725  * Feature set definitions
 726  */
 727
 728 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 729         (EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask))
 730 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 731         (EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask))
 732 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 733         (EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask))
 734 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 735         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 736 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 737         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 738 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 739         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 740 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 741         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 742 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 743         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 744 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 745         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 746
 747 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 748 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 749 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 750 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 751 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 752 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 753
 754 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 755 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 756 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 757 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
 758 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
 759 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 760 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 761
 762 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 763 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 764 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 765 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 766 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 767 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 768 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 769 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
 770 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
 771
 772 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 773 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 774                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 775                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 776                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 777                                          EXT4_FEATURE_INCOMPAT_64BIT| \
 778                                          EXT4_FEATURE_INCOMPAT_FLEX_BG)
 779 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 780                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 781                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
 782                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 783                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 784                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
 785                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
 786
 787 /*
 788  * Default values for user and/or group using reserved blocks
 789  */
 790 #define EXT4_DEF_RESUID         0
 791 #define EXT4_DEF_RESGID         0
 792
 793 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
 794
 795 /*
 796  * Default mount options
 797  */
 798 #define EXT4_DEFM_DEBUG         0x0001
 799 #define EXT4_DEFM_BSDGROUPS     0x0002
 800 #define EXT4_DEFM_XATTR_USER    0x0004
 801 #define EXT4_DEFM_ACL           0x0008
 802 #define EXT4_DEFM_UID16         0x0010
 803 #define EXT4_DEFM_JMODE         0x0060
 804 #define EXT4_DEFM_JMODE_DATA    0x0020
 805 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 806 #define EXT4_DEFM_JMODE_WBACK   0x0060
 807
 808 /*
 809  * Structure of a directory entry
 810  */
 811 #define EXT4_NAME_LEN 255
 812
 813 struct ext4_dir_entry {
 814         __le32  inode;                  /* Inode number */
 815         __le16  rec_len;                /* Directory entry length */
 816         __le16  name_len;               /* Name length */
 817         char    name[EXT4_NAME_LEN];    /* File name */
 818 };
 819
 820 /*
 821  * The new version of the directory entry.  Since EXT4 structures are
 822  * stored in intel byte order, and the name_len field could never be
 823  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 824  * file_type field.
 825  */
 826 struct ext4_dir_entry_2 {
 827         __le32  inode;                  /* Inode number */
 828         __le16  rec_len;                /* Directory entry length */
 829         __u8    name_len;               /* Name length */
 830         __u8    file_type;
 831         char    name[EXT4_NAME_LEN];    /* File name */
 832 };
 833
 834 /*
 835  * Ext4 directory file types.  Only the low 3 bits are used.  The
 836  * other bits are reserved for now.
 837  */
 838 #define EXT4_FT_UNKNOWN         0
 839 #define EXT4_FT_REG_FILE        1
 840 #define EXT4_FT_DIR             2
 841 #define EXT4_FT_CHRDEV          3
 842 #define EXT4_FT_BLKDEV          4
 843 #define EXT4_FT_FIFO            5
 844 #define EXT4_FT_SOCK            6
 845 #define EXT4_FT_SYMLINK         7
 846
 847 #define EXT4_FT_MAX             8
 848
 849 /*
 850  * EXT4_DIR_PAD defines the directory entries boundaries
 851  *
 852  * NOTE: It must be a multiple of 4
 853  */
 854 #define EXT4_DIR_PAD                    4
 855 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
 856 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
 857                                          ~EXT4_DIR_ROUND)
 858 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
 859
 860 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
 861 {
 862         unsigned len = le16_to_cpu(dlen);
 863
 864         if (len == EXT4_MAX_REC_LEN)
 865                 return 1 << 16;
 866         return len;
 867 }
 868
 869 static inline __le16 ext4_rec_len_to_disk(unsigned len)
 870 {
 871         if (len == (1 << 16))
 872                 return cpu_to_le16(EXT4_MAX_REC_LEN);
 873         else if (len > (1 << 16))
 874                 BUG();
 875         return cpu_to_le16(len);
 876 }
 877
 878 /*
 879  * Hash Tree Directory indexing
 880  * (c) Daniel Phillips, 2001
 881  */
 882
 883 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
 884                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
 885                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 886 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 887 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 888
 889 /* Legal values for the dx_root hash_version field: */
 890
 891 #define DX_HASH_LEGACY          0
 892 #define DX_HASH_HALF_MD4        1
 893 #define DX_HASH_TEA             2
 894
 895 #ifdef __KERNEL__
 896
 897 /* hash info structure used by the directory hash */
 898 struct dx_hash_info
 899 {
 900         u32             hash;
 901         u32             minor_hash;
 902         int             hash_version;
 903         u32             *seed;
 904 };
 905
 906 #define EXT4_HTREE_EOF  0x7fffffff
 907
 908 /*
 909  * Control parameters used by ext4_htree_next_block
 910  */
 911 #define HASH_NB_ALWAYS          1
 912
 913
 914 /*
 915  * Describe an inode's exact location on disk and in memory
 916  */
 917 struct ext4_iloc
 918 {
 919         struct buffer_head *bh;
 920         unsigned long offset;
 921         ext4_group_t block_group;
 922 };
 923
 924 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 925 {
 926         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 927 }
 928
 929 /*
 930  * This structure is stuffed into the struct file's private_data field
 931  * for directories.  It is where we put information so that we can do
 932  * readdir operations in hash tree order.
 933  */
 934 struct dir_private_info {
 935         struct rb_root  root;
 936         struct rb_node  *curr_node;
 937         struct fname    *extra_fname;
 938         loff_t          last_pos;
 939         __u32           curr_hash;
 940         __u32           curr_minor_hash;
 941         __u32           next_hash;
 942 };
 943
 944 /* calculate the first block number of the group */
 945 static inline ext4_fsblk_t
 946 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
 947 {
 948         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
 949                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 950 }
 951
 952 /*
 953  * Special error return code only used by dx_probe() and its callers.
 954  */
 955 #define ERR_BAD_DX_DIR  -75000
 956
 957 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 958                         unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
 959
 960 extern struct proc_dir_entry *ext4_proc_root;
 961
 962 #ifdef CONFIG_PROC_FS
 963 extern const struct file_operations ext4_ui_proc_fops;
 964
 965 #define EXT4_PROC_HANDLER(name, var)                                    \
 966 do {                                                                    \
 967         proc = proc_create_data(name, mode, sbi->s_proc,                \
 968                                 &ext4_ui_proc_fops, &sbi->s_##var);     \
 969         if (proc == NULL) {                                             \
 970                 printk(KERN_ERR "EXT4-fs: can't create %s\n", name);    \
 971                 goto err_out;                                           \
 972         }                                                               \
 973 } while (0)
 974 #else
 975 #define EXT4_PROC_HANDLER(name, var)
 976 #endif
 977
 978 /*
 979  * Function prototypes
 980  */
 981
 982 /*
 983  * Ok, these declarations are also in <linux/kernel.h> but none of the
 984  * ext4 source programs needs to include it so they are duplicated here.
 985  */
 986 # define NORET_TYPE     /**/
 987 # define ATTRIB_NORET   __attribute__((noreturn))
 988 # define NORET_AND      noreturn,
 989
 990 /* balloc.c */
 991 extern unsigned int ext4_block_group(struct super_block *sb,
 992                         ext4_fsblk_t blocknr);
 993 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 994                         ext4_fsblk_t blocknr);
 995 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
 996 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
 997                         ext4_group_t group);
 998 extern ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
 999                         ext4_fsblk_t goal, int *errp);
1000 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1001                         ext4_fsblk_t goal, unsigned long *count, int *errp);
1002 extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
1003                                         ext4_lblk_t iblock, ext4_fsblk_t goal,
1004                                         unsigned long *count, int *errp);
1005 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1006 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1007 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1008                         ext4_fsblk_t block, unsigned long count, int metadata);
1009 extern void ext4_free_blocks_sb(handle_t *handle, struct super_block *sb,
1010                                 ext4_fsblk_t block, unsigned long count,
1011                                 unsigned long *pdquot_freed_blocks);
1012 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1013 extern void ext4_check_blocks_bitmap(struct super_block *);
1014 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1015                                                     ext4_group_t block_group,
1016                                                     struct buffer_head ** bh);
1017 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1018
1019 /* dir.c */
1020 extern int ext4_check_dir_entry(const char *, struct inode *,
1021                                 struct ext4_dir_entry_2 *,
1022                                 struct buffer_head *, unsigned long);
1023 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1024                                     __u32 minor_hash,
1025                                     struct ext4_dir_entry_2 *dirent);
1026 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1027
1028 /* fsync.c */
1029 extern int ext4_sync_file(struct file *, struct dentry *, int);
1030
1031 /* hash.c */
1032 extern int ext4fs_dirhash(const char *name, int len, struct
1033                           dx_hash_info *hinfo);
1034
1035 /* ialloc.c */
1036 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1037 extern void ext4_free_inode(handle_t *, struct inode *);
1038 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1039 extern unsigned long ext4_count_free_inodes(struct super_block *);
1040 extern unsigned long ext4_count_dirs(struct super_block *);
1041 extern void ext4_check_inodes_bitmap(struct super_block *);
1042 extern unsigned long ext4_count_free(struct buffer_head *, unsigned);
1043
1044 /* mballoc.c */
1045 extern long ext4_mb_stats;
1046 extern long ext4_mb_max_to_scan;
1047 extern int ext4_mb_init(struct super_block *, int);
1048 extern int ext4_mb_release(struct super_block *);
1049 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1050                                 struct ext4_allocation_request *, int *);
1051 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1052 extern void ext4_discard_preallocations(struct inode *);
1053 extern int __init init_ext4_mballoc(void);
1054 extern void exit_ext4_mballoc(void);
1055 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1056                 unsigned long, unsigned long, int, unsigned long *);
1057 extern int ext4_mb_add_more_groupinfo(struct super_block *sb,
1058                 ext4_group_t i, struct ext4_group_desc *desc);
1059 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1060                 ext4_grpblk_t add);
1061
1062
1063 /* inode.c */
1064 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1065                 struct buffer_head *bh, ext4_fsblk_t blocknr);
1066 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1067                                                 ext4_lblk_t, int, int *);
1068 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1069                                                 ext4_lblk_t, int, int *);
1070 int ext4_get_block(struct inode *inode, sector_t iblock,
1071                                 struct buffer_head *bh_result, int create);
1072 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1073                                 ext4_lblk_t iblock, unsigned long maxblocks,
1074                                 struct buffer_head *bh_result,
1075                                 int create, int extend_disksize);
1076
1077 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1078 extern int  ext4_write_inode(struct inode *, int);
1079 extern int  ext4_setattr(struct dentry *, struct iattr *);
1080 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1081                                 struct kstat *stat);
1082 extern void ext4_delete_inode(struct inode *);
1083 extern int  ext4_sync_inode(handle_t *, struct inode *);
1084 extern void ext4_dirty_inode(struct inode *);
1085 extern int ext4_change_inode_journal_flag(struct inode *, int);
1086 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1087 extern int ext4_can_truncate(struct inode *inode);
1088 extern void ext4_truncate(struct inode *);
1089 extern void ext4_set_inode_flags(struct inode *);
1090 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1091 extern void ext4_set_aops(struct inode *inode);
1092 extern int ext4_writepage_trans_blocks(struct inode *);
1093 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1094 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1095 extern int ext4_block_truncate_page(handle_t *handle,
1096                 struct address_space *mapping, loff_t from);
1097 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1098
1099 /* ioctl.c */
1100 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1101 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1102
1103 /* migrate.c */
1104 extern int ext4_ext_migrate(struct inode *);
1105 /* namei.c */
1106 extern int ext4_orphan_add(handle_t *, struct inode *);
1107 extern int ext4_orphan_del(handle_t *, struct inode *);
1108 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1109                                 __u32 start_minor_hash, __u32 *next_hash);
1110
1111 /* resize.c */
1112 extern int ext4_group_add(struct super_block *sb,
1113                                 struct ext4_new_group_data *input);
1114 extern int ext4_group_extend(struct super_block *sb,
1115                                 struct ext4_super_block *es,
1116                                 ext4_fsblk_t n_blocks_count);
1117
1118 /* super.c */
1119 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1120         __attribute__ ((format (printf, 3, 4)));
1121 extern void __ext4_std_error(struct super_block *, const char *, int);
1122 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1123         __attribute__ ((format (printf, 3, 4)));
1124 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1125         __attribute__ ((format (printf, 3, 4)));
1126 extern void ext4_update_dynamic_rev(struct super_block *sb);
1127 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1128                                         __u32 compat);
1129 extern int ext4_update_rocompat_feature(handle_t *handle,
1130                                         struct super_block *sb, __u32 rocompat);
1131 extern int ext4_update_incompat_feature(handle_t *handle,
1132                                         struct super_block *sb, __u32 incompat);
1133 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1134                                       struct ext4_group_desc *bg);
1135 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1136                                       struct ext4_group_desc *bg);
1137 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1138                                      struct ext4_group_desc *bg);
1139 extern void ext4_block_bitmap_set(struct super_block *sb,
1140                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1141 extern void ext4_inode_bitmap_set(struct super_block *sb,
1142                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1143 extern void ext4_inode_table_set(struct super_block *sb,
1144                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1145
1146 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1147 {
1148         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1149                 le32_to_cpu(es->s_blocks_count_lo);
1150 }
1151
1152 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1153 {
1154         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1155                 le32_to_cpu(es->s_r_blocks_count_lo);
1156 }
1157
1158 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1159 {
1160         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1161                 le32_to_cpu(es->s_free_blocks_count_lo);
1162 }
1163
1164 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1165                                          ext4_fsblk_t blk)
1166 {
1167         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1168         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1169 }
1170
1171 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1172                                               ext4_fsblk_t blk)
1173 {
1174         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1175         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1176 }
1177
1178 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1179                                            ext4_fsblk_t blk)
1180 {
1181         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1182         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1183 }
1184
1185 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1186 {
1187         return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1188                 le32_to_cpu(raw_inode->i_size_lo);
1189 }
1190
1191 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1192 {
1193         raw_inode->i_size_lo = cpu_to_le32(i_size);
1194         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1195 }
1196
1197 static inline
1198 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1199                                             ext4_group_t group)
1200 {
1201          struct ext4_group_info ***grp_info;
1202          long indexv, indexh;
1203          grp_info = EXT4_SB(sb)->s_group_info;
1204          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1205          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1206          return grp_info[indexv][indexh];
1207 }
1208
1209
1210 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1211                                              ext4_group_t block_group)
1212 {
1213         return block_group >> sbi->s_log_groups_per_flex;
1214 }
1215
1216 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1217 {
1218         return 1 << sbi->s_log_groups_per_flex;
1219 }
1220
1221 #define ext4_std_error(sb, errno)                               \
1222 do {                                                            \
1223         if ((errno))                                            \
1224                 __ext4_std_error((sb), __func__, (errno));      \
1225 } while (0)
1226
1227 #ifdef CONFIG_SMP
1228 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1229  * counters. So we need to make sure we have free blocks more
1230  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
1231  */
1232 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1233 #else
1234 #define EXT4_FREEBLOCKS_WATERMARK 0
1235 #endif
1236
1237 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1238 {
1239         /*
1240          * XXX: replace with spinlock if seen contended -bzzz
1241          */
1242         down_write(&EXT4_I(inode)->i_data_sem);
1243         if (newsize > EXT4_I(inode)->i_disksize)
1244                 EXT4_I(inode)->i_disksize = newsize;
1245         up_write(&EXT4_I(inode)->i_data_sem);
1246         return ;
1247 }
1248
1249 /*
1250  * Inodes and files operations
1251  */
1252
1253 /* dir.c */
1254 extern const struct file_operations ext4_dir_operations;
1255
1256 /* file.c */
1257 extern const struct inode_operations ext4_file_inode_operations;
1258 extern const struct file_operations ext4_file_operations;
1259
1260 /* namei.c */
1261 extern const struct inode_operations ext4_dir_inode_operations;
1262 extern const struct inode_operations ext4_special_inode_operations;
1263
1264 /* symlink.c */
1265 extern const struct inode_operations ext4_symlink_inode_operations;
1266 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1267
1268 /* extents.c */
1269 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1270 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1271 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1272                                        int chunk);
1273 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1274                         ext4_lblk_t iblock,
1275                         unsigned long max_blocks, struct buffer_head *bh_result,
1276                         int create, int extend_disksize);
1277 extern void ext4_ext_truncate(struct inode *);
1278 extern void ext4_ext_init(struct super_block *);
1279 extern void ext4_ext_release(struct super_block *);
1280 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1281                           loff_t len);
1282 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1283                         sector_t block, unsigned long max_blocks,
1284                         struct buffer_head *bh, int create,
1285                         int extend_disksize, int flag);
1286 #endif  /* __KERNEL__ */
1287
1288 #endif  /* _EXT4_H */