LXR linux/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 "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
  81struct 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 */
 154struct 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
 180struct 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 */
 259struct 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 */
 270struct 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 */
 326struct 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 */
 340struct 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
 420static 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
 427static 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)                          \
 436do {                                                                           \
 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)                        \
 444do {                                                                           \
 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)                          \
 453do {                                                                           \
 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)                        \
 461do {                                                                           \
 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 */
 582struct 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__
 671static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
 672{
 673        return sb->s_fs_info;
 674}
 675static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 676{
 677        return container_of(inode, struct ext4_inode_info, vfs_inode);
 678}
 679
 680static 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
 687static 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
 813struct 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 */
 826struct 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
 860static 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
 869static 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 */
 898struct 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 */
 917struct ext4_iloc
 918{
 919        struct buffer_head *bh;
 920        unsigned long offset;
 921        ext4_group_t block_group;
 922};
 923
 924static 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 */
 934struct 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 */
 945static inline ext4_fsblk_t
 946ext4_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
 957void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 958                        unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
 959
 960extern struct proc_dir_entry *ext4_proc_root;
 961
 962#ifdef CONFIG_PROC_FS
 963extern const struct file_operations ext4_ui_proc_fops;
 964
 965#define EXT4_PROC_HANDLER(name, var)                                    \
 966do {                                                                    \
 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 */
 991extern unsigned int ext4_block_group(struct super_block *sb,
 992                        ext4_fsblk_t blocknr);
 993extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 994                        ext4_fsblk_t blocknr);
 995extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
 996extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
 997                        ext4_group_t group);
 998extern ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
 999                        ext4_fsblk_t goal, int *errp);
1000extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,

1001                        ext4_fsblk_t goal, unsigned long *count, int *errp);
1002extern 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);
1005extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1006extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1007extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1008                        ext4_fsblk_t block, unsigned long count, int metadata);
1009extern 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);
1012extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1013extern void ext4_check_blocks_bitmap(struct super_block *);
1014extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1015                                                    ext4_group_t block_group,
1016                                                    struct buffer_head ** bh);
1017extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1018
1019/* dir.c */
1020extern int ext4_check_dir_entry(const char *, struct inode *,
1021                                struct ext4_dir_entry_2 *,
1022                                struct buffer_head *, unsigned long);
1023extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1024                                    __u32 minor_hash,
1025                                    struct ext4_dir_entry_2 *dirent);
1026extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1027
1028/* fsync.c */
1029extern int ext4_sync_file(struct file *, struct dentry *, int);
1030
1031/* hash.c */
1032extern int ext4fs_dirhash(const char *name, int len, struct
1033                          dx_hash_info *hinfo);
1034
1035/* ialloc.c */
1036extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1037extern void ext4_free_inode(handle_t *, struct inode *);
1038extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1039extern unsigned long ext4_count_free_inodes(struct super_block *);
1040extern unsigned long ext4_count_dirs(struct super_block *);
1041extern void ext4_check_inodes_bitmap(struct super_block *);
1042extern unsigned long ext4_count_free(struct buffer_head *, unsigned);
1043
1044/* mballoc.c */
1045extern long ext4_mb_stats;
1046extern long ext4_mb_max_to_scan;
1047extern int ext4_mb_init(struct super_block *, int);
1048extern int ext4_mb_release(struct super_block *);
1049extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1050                                struct ext4_allocation_request *, int *);
1051extern int ext4_mb_reserve_blocks(struct super_block *, int);
1052extern void ext4_discard_preallocations(struct inode *);
1053extern int __init init_ext4_mballoc(void);
1054extern void exit_ext4_mballoc(void);
1055extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1056                unsigned long, unsigned long, int, unsigned long *);
1057extern int ext4_mb_add_more_groupinfo(struct super_block *sb,
1058                ext4_group_t i, struct ext4_group_desc *desc);
1059extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1060                ext4_grpblk_t add);
1061
1062
1063/* inode.c */
1064int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1065                struct buffer_head *bh, ext4_fsblk_t blocknr);
1066struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1067                                                ext4_lblk_t, int, int *);
1068struct buffer_head *ext4_bread(handle_t *, struct inode *,
1069                                                ext4_lblk_t, int, int *);
1070int ext4_get_block(struct inode *inode, sector_t iblock,
1071                                struct buffer_head *bh_result, int create);
1072int 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
1077extern struct inode *ext4_iget(struct super_block *, unsigned long);
1078extern int  ext4_write_inode(struct inode *, int);
1079extern int  ext4_setattr(struct dentry *, struct iattr *);
1080extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1081                                struct kstat *stat);
1082extern void ext4_delete_inode(struct inode *);
1083extern int  ext4_sync_inode(handle_t *, struct inode *);
1084extern void ext4_dirty_inode(struct inode *);
1085extern int ext4_change_inode_journal_flag(struct inode *, int);
1086extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1087extern int ext4_can_truncate(struct inode *inode);
1088extern void ext4_truncate(struct inode *);
1089extern void ext4_set_inode_flags(struct inode *);
1090extern void ext4_get_inode_flags(struct ext4_inode_info *);
1091extern void ext4_set_aops(struct inode *inode);
1092extern int ext4_writepage_trans_blocks(struct inode *);
1093extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1094extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1095extern int ext4_block_truncate_page(handle_t *handle,
1096                struct address_space *mapping, loff_t from);
1097extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1098
1099/* ioctl.c */
1100extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1101extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1102
1103/* migrate.c */
1104extern int ext4_ext_migrate(struct inode *);
1105/* namei.c */
1106extern int ext4_orphan_add(handle_t *, struct inode *);
1107extern int ext4_orphan_del(handle_t *, struct inode *);
1108extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1109                                __u32 start_minor_hash, __u32 *next_hash);
1110
1111/* resize.c */
1112extern int ext4_group_add(struct super_block *sb,
1113                                struct ext4_new_group_data *input);
1114extern 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 */
1119extern void ext4_error(struct super_block *, const char *, const char *, ...)
1120        __attribute__ ((format (printf, 3, 4)));
1121extern void __ext4_std_error(struct super_block *, const char *, int);
1122extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1123        __attribute__ ((format (printf, 3, 4)));
1124extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1125        __attribute__ ((format (printf, 3, 4)));
1126extern void ext4_update_dynamic_rev(struct super_block *sb);
1127extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1128                                        __u32 compat);
1129extern int ext4_update_rocompat_feature(handle_t *handle,
1130                                        struct super_block *sb, __u32 rocompat);
1131extern int ext4_update_incompat_feature(handle_t *handle,
1132                                        struct super_block *sb, __u32 incompat);
1133extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1134                                      struct ext4_group_desc *bg);
1135extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1136                                      struct ext4_group_desc *bg);
1137extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1138                                     struct ext4_group_desc *bg);
1139extern void ext4_block_bitmap_set(struct super_block *sb,
1140                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1141extern void ext4_inode_bitmap_set(struct super_block *sb,
1142                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1143extern void ext4_inode_table_set(struct super_block *sb,
1144                                 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1145
1146static 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
1152static 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
1158static 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
1164static 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
1171static 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
1178static 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
1185static 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
1191static 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
1197static inline
1198struct 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
1210static 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
1216static 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)                               \
1222do {                                                            \
1223        if ((errno))                                            \
1224                __ext4_std_error((sb), __func__, (errno));      \
1225} while (0)
1226
1227#ifdef CONFIG_SMP
1228/* Each CPU can accumulate FBC_BATCH blocks in their local
1229 * counters. So we need to make sure we have free blocks more
1230 * than FBC_BATCH  * nr_cpu_ids. Also add a window of 4 times.
1231 */
1232#define EXT4_FREEBLOCKS_WATERMARK (4 * (FBC_BATCH * nr_cpu_ids))
1233#else
1234#define EXT4_FREEBLOCKS_WATERMARK 0
1235#endif
1236
1237static 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 */
1254extern const struct file_operations ext4_dir_operations;
1255
1256/* file.c */
1257extern const struct inode_operations ext4_file_inode_operations;
1258extern const struct file_operations ext4_file_operations;
1259
1260/* namei.c */
1261extern const struct inode_operations ext4_dir_inode_operations;
1262extern const struct inode_operations ext4_special_inode_operations;
1263
1264/* symlink.c */
1265extern const struct inode_operations ext4_symlink_inode_operations;
1266extern const struct inode_operations ext4_fast_symlink_inode_operations;
1267
1268/* extents.c */
1269extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1270extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1271extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1272                                       int chunk);
1273extern 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);
1277extern void ext4_ext_truncate(struct inode *);
1278extern void ext4_ext_init(struct super_block *);
1279extern void ext4_ext_release(struct super_block *);
1280extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1281                          loff_t len);
1282extern 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 */
1289