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   1 /*
   2  *  ext4.h
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/include/linux/minix_fs.h
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _EXT4_H
  17 #define _EXT4_H
  18
  19 #include <linux/types.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/magic.h>
  22 #include <linux/jbd2.h>
  23 #include <linux/quota.h>
  24 #include <linux/rwsem.h>
  25 #include <linux/rbtree.h>
  26 #include <linux/seqlock.h>
  27 #include <linux/mutex.h>
  28
  29 /*
  30  * The fourth extended filesystem constants/structures
  31  */
  32
  33 /*
  34  * Define EXT4FS_DEBUG to produce debug messages
  35  */
  36 #undef EXT4FS_DEBUG
  37
  38 /*
  39  * Debug code
  40  */
  41 #ifdef EXT4FS_DEBUG
  42 #define ext4_debug(f, a...)                                             \
  43         do {                                                            \
  44                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  45                         __FILE__, __LINE__, __func__);                  \
  46                 printk(KERN_DEBUG f, ## a);                             \
  47         } while (0)
  48 #else
  49 #define ext4_debug(f, a...)     do {} while (0)
  50 #endif
  51
  52 /* data type for block offset of block group */
  53 typedef int ext4_grpblk_t;
  54
  55 /* data type for filesystem-wide blocks number */
  56 typedef unsigned long long ext4_fsblk_t;
  57
  58 /* data type for file logical block number */
  59 typedef __u32 ext4_lblk_t;
  60
  61 /* data type for block group number */
  62 typedef unsigned int ext4_group_t;
  63
  64
  65 /* prefer goal again. length */
  66 #define EXT4_MB_HINT_MERGE              1
  67 /* blocks already reserved */
  68 #define EXT4_MB_HINT_RESERVED           2
  69 /* metadata is being allocated */
  70 #define EXT4_MB_HINT_METADATA           4
  71 /* first blocks in the file */
  72 #define EXT4_MB_HINT_FIRST              8
  73 /* search for the best chunk */
  74 #define EXT4_MB_HINT_BEST               16
  75 /* data is being allocated */
  76 #define EXT4_MB_HINT_DATA               32
  77 /* don't preallocate (for tails) */
  78 #define EXT4_MB_HINT_NOPREALLOC         64
  79 /* allocate for locality group */
  80 #define EXT4_MB_HINT_GROUP_ALLOC        128
  81 /* allocate goal blocks or none */
  82 #define EXT4_MB_HINT_GOAL_ONLY          256
  83 /* goal is meaningful */
  84 #define EXT4_MB_HINT_TRY_GOAL           512
  85 /* blocks already pre-reserved by delayed allocation */
  86 #define EXT4_MB_DELALLOC_RESERVED      1024
  87
  88
  89 struct ext4_allocation_request {
  90         /* target inode for block we're allocating */
  91         struct inode *inode;
  92         /* logical block in target inode */
  93         ext4_lblk_t logical;
  94         /* phys. target (a hint) */
  95         ext4_fsblk_t goal;
  96         /* the closest logical allocated block to the left */
  97         ext4_lblk_t lleft;
  98         /* phys. block for ^^^ */
  99         ext4_fsblk_t pleft;
 100         /* the closest logical allocated block to the right */
 101         ext4_lblk_t lright;
 102         /* phys. block for ^^^ */
 103         ext4_fsblk_t pright;
 104         /* how many blocks we want to allocate */
 105         unsigned int len;
 106         /* flags. see above EXT4_MB_HINT_* */
 107         unsigned int flags;
 108 };
 109
 110 /*
 111  * Special inodes numbers
 112  */
 113 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 114 #define EXT4_ROOT_INO            2      /* Root inode */
 115 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 116 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 117 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 118 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 119
 120 /* First non-reserved inode for old ext4 filesystems */
 121 #define EXT4_GOOD_OLD_FIRST_INO 11
 122
 123 /*
 124  * Maximal count of links to a file
 125  */
 126 #define EXT4_LINK_MAX           65000
 127
 128 /*
 129  * Macro-instructions used to manage several block sizes
 130  */
 131 #define EXT4_MIN_BLOCK_SIZE             1024
 132 #define EXT4_MAX_BLOCK_SIZE             65536
 133 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 134 #ifdef __KERNEL__
 135 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 136 #else
 137 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 138 #endif
 139 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 140 #ifdef __KERNEL__
 141 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 142 #else
 143 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 144 #endif
 145 #ifdef __KERNEL__
 146 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 147 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 148 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 149 #else
 150 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 151                                  EXT4_GOOD_OLD_INODE_SIZE : \
 152                                  (s)->s_inode_size)
 153 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 154                                  EXT4_GOOD_OLD_FIRST_INO : \
 155                                  (s)->s_first_ino)
 156 #endif
 157 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 158
 159 /*
 160  * Structure of a blocks group descriptor
 161  */
 162 struct ext4_group_desc
 163 {
 164         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 165         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 166         __le32  bg_inode_table_lo;      /* Inodes table block */
 167         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 168         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 169         __le16  bg_used_dirs_count_lo;  /* Directories count */
 170         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 171         __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */
 172         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 173         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 174         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 175         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 176         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 177         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 178         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 179         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 180         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 181         __u32   bg_reserved2[3];
 182 };
 183
 184 /*
 185  * Structure of a flex block group info
 186  */
 187
 188 struct flex_groups {
 189         atomic_t free_inodes;
 190         atomic_t free_blocks;
 191         atomic_t used_dirs;
 192 };
 193
 194 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 195 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 196 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 197
 198 #ifdef __KERNEL__
 199 #include "ext4_sb.h"
 200 #endif
 201 /*
 202  * Macro-instructions used to manage group descriptors
 203  */
 204 #define EXT4_MIN_DESC_SIZE              32
 205 #define EXT4_MIN_DESC_SIZE_64BIT        64
 206 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 207 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 208 #ifdef __KERNEL__
 209 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 210 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 211 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 212 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 213 #else
 214 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 215 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 216 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 217 #endif
 218
 219 /*
 220  * Constants relative to the data blocks
 221  */
 222 #define EXT4_NDIR_BLOCKS                12
 223 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 224 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 225 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 226 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 227
 228 /*
 229  * Inode flags
 230  */
 231 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 232 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 233 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 234 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 235 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 236 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 237 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 238 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 239 /* Reserved for compression usage... */
 240 #define EXT4_DIRTY_FL                   0x00000100
 241 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 242 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 243 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 244 /* End compression flags --- maybe not all used */
 245 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 246 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 247 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 248 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 249 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 250 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 251 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 252 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 253 #define EXT4_EXT_MIGRATE                0x00100000 /* Inode is migrating */
 254 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 255
 256 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 257 #define EXT4_FL_USER_MODIFIABLE         0x000B80FF /* User modifiable flags */
 258
 259 /* Flags that should be inherited by new inodes from their parent. */
 260 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 261                            EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
 262                            EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 263                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 264                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
 265
 266 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 267 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 268
 269 /* Flags that are appropriate for non-directories/regular files. */
 270 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 271
 272 /* Mask out flags that are inappropriate for the given type of inode. */
 273 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 274 {
 275         if (S_ISDIR(mode))
 276                 return flags;
 277         else if (S_ISREG(mode))
 278                 return flags & EXT4_REG_FLMASK;
 279         else
 280                 return flags & EXT4_OTHER_FLMASK;
 281 }
 282
 283 /*
 284  * Inode dynamic state flags
 285  */
 286 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 287 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 288 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 289 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 290 #define EXT4_STATE_DA_ALLOC_CLOSE       0x00000010 /* Alloc DA blks on close */
 291
 292 /* Used to pass group descriptor data when online resize is done */
 293 struct ext4_new_group_input {
 294         __u32 group;            /* Group number for this data */
 295         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 296         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 297         __u64 inode_table;      /* Absolute block number of inode table start */
 298         __u32 blocks_count;     /* Total number of blocks in this group */
 299         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 300         __u16 unused;
 301 };
 302
 303 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 304 struct ext4_new_group_data {
 305         __u32 group;
 306         __u64 block_bitmap;
 307         __u64 inode_bitmap;
 308         __u64 inode_table;
 309         __u32 blocks_count;
 310         __u16 reserved_blocks;
 311         __u16 unused;
 312         __u32 free_blocks_count;
 313 };
 314
 315 /*
 316  * Following is used by preallocation code to tell get_blocks() that we
 317  * want uninitialzed extents.
 318  */
 319 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 320
 321 /*
 322  * ioctl commands
 323  */
 324 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 325 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 326 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 327 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 328 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 329 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 330 #ifdef CONFIG_JBD2_DEBUG
 331 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 332 #endif
 333 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 334 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 335 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 336 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 337 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 338  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 339  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 340 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 341
 342 /*
 343  * ioctl commands in 32 bit emulation
 344  */
 345 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 346 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 347 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 348 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 349 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 350 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 351 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 352 #ifdef CONFIG_JBD2_DEBUG
 353 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 354 #endif
 355 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 356 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 357
 358
 359 /*
 360  *  Mount options
 361  */
 362 struct ext4_mount_options {
 363         unsigned long s_mount_opt;
 364         uid_t s_resuid;
 365         gid_t s_resgid;
 366         unsigned long s_commit_interval;
 367         u32 s_min_batch_time, s_max_batch_time;
 368 #ifdef CONFIG_QUOTA
 369         int s_jquota_fmt;
 370         char *s_qf_names[MAXQUOTAS];
 371 #endif
 372 };
 373
 374 /*
 375  * Structure of an inode on the disk
 376  */
 377 struct ext4_inode {
 378         __le16  i_mode;         /* File mode */
 379         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 380         __le32  i_size_lo;      /* Size in bytes */
 381         __le32  i_atime;        /* Access time */
 382         __le32  i_ctime;        /* Inode Change time */
 383         __le32  i_mtime;        /* Modification time */
 384         __le32  i_dtime;        /* Deletion Time */
 385         __le16  i_gid;          /* Low 16 bits of Group Id */
 386         __le16  i_links_count;  /* Links count */
 387         __le32  i_blocks_lo;    /* Blocks count */
 388         __le32  i_flags;        /* File flags */
 389         union {
 390                 struct {
 391                         __le32  l_i_version;
 392                 } linux1;
 393                 struct {
 394                         __u32  h_i_translator;
 395                 } hurd1;
 396                 struct {
 397                         __u32  m_i_reserved1;
 398                 } masix1;
 399         } osd1;                         /* OS dependent 1 */
 400         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 401         __le32  i_generation;   /* File version (for NFS) */
 402         __le32  i_file_acl_lo;  /* File ACL */
 403         __le32  i_size_high;
 404         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 405         union {
 406                 struct {
 407                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 408                         __le16  l_i_file_acl_high;
 409                         __le16  l_i_uid_high;   /* these 2 fields */
 410                         __le16  l_i_gid_high;   /* were reserved2[0] */
 411                         __u32   l_i_reserved2;
 412                 } linux2;
 413                 struct {
 414                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 415                         __u16   h_i_mode_high;
 416                         __u16   h_i_uid_high;
 417                         __u16   h_i_gid_high;
 418                         __u32   h_i_author;
 419                 } hurd2;
 420                 struct {
 421                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 422                         __le16  m_i_file_acl_high;
 423                         __u32   m_i_reserved2[2];
 424                 } masix2;
 425         } osd2;                         /* OS dependent 2 */
 426         __le16  i_extra_isize;
 427         __le16  i_pad1;
 428         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 429         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 430         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 431         __le32  i_crtime;       /* File Creation time */
 432         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 433         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 434 };
 435
 436
 437 #define EXT4_EPOCH_BITS 2
 438 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 439 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 440
 441 /*
 442  * Extended fields will fit into an inode if the filesystem was formatted
 443  * with large inodes (-I 256 or larger) and there are not currently any EAs
 444  * consuming all of the available space. For new inodes we always reserve
 445  * enough space for the kernel's known extended fields, but for inodes
 446  * created with an old kernel this might not have been the case. None of
 447  * the extended inode fields is critical for correct filesystem operation.
 448  * This macro checks if a certain field fits in the inode. Note that
 449  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 450  */
 451 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 452         ((offsetof(typeof(*ext4_inode), field) +        \
 453           sizeof((ext4_inode)->field))                  \
 454         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 455             (einode)->i_extra_isize))                   \
 456
 457 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 458 {
 459        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 460                            time->tv_sec >> 32 : 0) |
 461                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 462 }
 463
 464 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 465 {
 466        if (sizeof(time->tv_sec) > 4)
 467                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 468                                << 32;
 469        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 470 }
 471
 472 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 473 do {                                                                           \
 474         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 475         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 476                 (raw_inode)->xtime ## _extra =                                 \
 477                                 ext4_encode_extra_time(&(inode)->xtime);       \
 478 } while (0)
 479
 480 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 481 do {                                                                           \
 482         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 483                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 484         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 485                 (raw_inode)->xtime ## _extra =                                 \
 486                                 ext4_encode_extra_time(&(einode)->xtime);      \
 487 } while (0)
 488
 489 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 490 do {                                                                           \
 491         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 492         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 493                 ext4_decode_extra_time(&(inode)->xtime,                        \
 494                                        raw_inode->xtime ## _extra);            \
 495 } while (0)
 496
 497 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 498 do {                                                                           \
 499         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 500                 (einode)->xtime.tv_sec =                                       \
 501                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 502         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 503                 ext4_decode_extra_time(&(einode)->xtime,                       \
 504                                        raw_inode->xtime ## _extra);            \
 505 } while (0)
 506
 507 #define i_disk_version osd1.linux1.l_i_version
 508
 509 #if defined(__KERNEL__) || defined(__linux__)
 510 #define i_reserved1     osd1.linux1.l_i_reserved1
 511 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 512 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 513 #define i_uid_low       i_uid
 514 #define i_gid_low       i_gid
 515 #define i_uid_high      osd2.linux2.l_i_uid_high
 516 #define i_gid_high      osd2.linux2.l_i_gid_high
 517 #define i_reserved2     osd2.linux2.l_i_reserved2
 518
 519 #elif defined(__GNU__)
 520
 521 #define i_translator    osd1.hurd1.h_i_translator
 522 #define i_uid_high      osd2.hurd2.h_i_uid_high
 523 #define i_gid_high      osd2.hurd2.h_i_gid_high
 524 #define i_author        osd2.hurd2.h_i_author
 525
 526 #elif defined(__masix__)
 527
 528 #define i_reserved1     osd1.masix1.m_i_reserved1
 529 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 530 #define i_reserved2     osd2.masix2.m_i_reserved2
 531
 532 #endif /* defined(__KERNEL__) || defined(__linux__) */
 533
 534 /*
 535  * storage for cached extent
 536  */
 537 struct ext4_ext_cache {
 538         ext4_fsblk_t    ec_start;
 539         ext4_lblk_t     ec_block;
 540         __u32           ec_len; /* must be 32bit to return holes */
 541         __u32           ec_type;
 542 };
 543
 544 /*
 545  * fourth extended file system inode data in memory
 546  */
 547 struct ext4_inode_info {
 548         __le32  i_data[15];     /* unconverted */
 549         __u32   i_flags;
 550         ext4_fsblk_t    i_file_acl;
 551         __u32   i_dtime;
 552
 553         /*
 554          * i_block_group is the number of the block group which contains
 555          * this file's inode.  Constant across the lifetime of the inode,
 556          * it is ued for making block allocation decisions - we try to
 557          * place a file's data blocks near its inode block, and new inodes
 558          * near to their parent directory's inode.
 559          */
 560         ext4_group_t    i_block_group;
 561         __u32   i_state;                /* Dynamic state flags for ext4 */
 562
 563         ext4_lblk_t             i_dir_start_lookup;
 564 #ifdef CONFIG_EXT4_FS_XATTR
 565         /*
 566          * Extended attributes can be read independently of the main file
 567          * data. Taking i_mutex even when reading would cause contention
 568          * between readers of EAs and writers of regular file data, so
 569          * instead we synchronize on xattr_sem when reading or changing
 570          * EAs.
 571          */
 572         struct rw_semaphore xattr_sem;
 573 #endif
 574 #ifdef CONFIG_EXT4_FS_POSIX_ACL
 575         struct posix_acl        *i_acl;
 576         struct posix_acl        *i_default_acl;
 577 #endif
 578
 579         struct list_head i_orphan;      /* unlinked but open inodes */
 580
 581         /*
 582          * i_disksize keeps track of what the inode size is ON DISK, not
 583          * in memory.  During truncate, i_size is set to the new size by
 584          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 585          * set i_disksize to 0 until the truncate is actually under way.
 586          *
 587          * The intent is that i_disksize always represents the blocks which
 588          * are used by this file.  This allows recovery to restart truncate
 589          * on orphans if we crash during truncate.  We actually write i_disksize
 590          * into the on-disk inode when writing inodes out, instead of i_size.
 591          *
 592          * The only time when i_disksize and i_size may be different is when
 593          * a truncate is in progress.  The only things which change i_disksize
 594          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 595          */
 596         loff_t  i_disksize;
 597
 598         /*
 599          * i_data_sem is for serialising ext4_truncate() against
 600          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 601          * data tree are chopped off during truncate. We can't do that in
 602          * ext4 because whenever we perform intermediate commits during
 603          * truncate, the inode and all the metadata blocks *must* be in a
 604          * consistent state which allows truncation of the orphans to restart
 605          * during recovery.  Hence we must fix the get_block-vs-truncate race
 606          * by other means, so we have i_data_sem.
 607          */
 608         struct rw_semaphore i_data_sem;
 609         struct inode vfs_inode;
 610         struct jbd2_inode jinode;
 611
 612         struct ext4_ext_cache i_cached_extent;
 613         /*
 614          * File creation time. Its function is same as that of
 615          * struct timespec i_{a,c,m}time in the generic inode.
 616          */
 617         struct timespec i_crtime;
 618
 619         /* mballoc */
 620         struct list_head i_prealloc_list;
 621         spinlock_t i_prealloc_lock;
 622
 623         /* ialloc */
 624         ext4_group_t    i_last_alloc_group;
 625
 626         /* allocation reservation info for delalloc */
 627         unsigned int i_reserved_data_blocks;
 628         unsigned int i_reserved_meta_blocks;
 629         unsigned int i_allocated_meta_blocks;
 630         unsigned short i_delalloc_reserved_flag;
 631
 632         /* on-disk additional length */
 633         __u16 i_extra_isize;
 634
 635         spinlock_t i_block_reservation_lock;
 636 };
 637
 638 /*
 639  * File system states
 640  */
 641 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 642 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 643 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 644
 645 /*
 646  * Misc. filesystem flags
 647  */
 648 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 649 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 650 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 651
 652 /*
 653  * Mount flags
 654  */
 655 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 656 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 657 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 658 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 659 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 660 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 661 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 662 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 663 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 664 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 665 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 666 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 667 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 668 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 669 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 670 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 671 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 672 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
 673 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 674 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 675 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 676 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 677 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 678 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
 679 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 680 #define EXT4_MOUNT_I_VERSION            0x2000000 /* i_version support */
 681 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
 682 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
 683
 684 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 685 #ifndef _LINUX_EXT2_FS_H
 686 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 687 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 688 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 689                                          EXT4_MOUNT_##opt)
 690 #else
 691 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 692 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 693 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 694 #endif
 695
 696 #define ext4_set_bit                    ext2_set_bit
 697 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 698 #define ext4_clear_bit                  ext2_clear_bit
 699 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 700 #define ext4_test_bit                   ext2_test_bit
 701 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 702 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 703 #define ext4_find_next_bit              ext2_find_next_bit
 704
 705 /*
 706  * Maximal mount counts between two filesystem checks
 707  */
 708 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 709 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 710
 711 /*
 712  * Behaviour when detecting errors
 713  */
 714 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 715 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 716 #define EXT4_ERRORS_PANIC               3       /* Panic */
 717 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 718
 719 /*
 720  * Structure of the super block
 721  */
 722 struct ext4_super_block {
 723 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 724         __le32  s_blocks_count_lo;      /* Blocks count */
 725         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
 726         __le32  s_free_blocks_count_lo; /* Free blocks count */
 727 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 728         __le32  s_first_data_block;     /* First Data Block */
 729         __le32  s_log_block_size;       /* Block size */
 730         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 731 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 732         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 733         __le32  s_inodes_per_group;     /* # Inodes per group */
 734         __le32  s_mtime;                /* Mount time */
 735 /*30*/  __le32  s_wtime;                /* Write time */
 736         __le16  s_mnt_count;            /* Mount count */
 737         __le16  s_max_mnt_count;        /* Maximal mount count */
 738         __le16  s_magic;                /* Magic signature */
 739         __le16  s_state;                /* File system state */
 740         __le16  s_errors;               /* Behaviour when detecting errors */
 741         __le16  s_minor_rev_level;      /* minor revision level */
 742 /*40*/  __le32  s_lastcheck;            /* time of last check */
 743         __le32  s_checkinterval;        /* max. time between checks */
 744         __le32  s_creator_os;           /* OS */
 745         __le32  s_rev_level;            /* Revision level */
 746 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 747         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 748         /*
 749          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 750          *
 751          * Note: the difference between the compatible feature set and
 752          * the incompatible feature set is that if there is a bit set
 753          * in the incompatible feature set that the kernel doesn't
 754          * know about, it should refuse to mount the filesystem.
 755          *
 756          * e2fsck's requirements are more strict; if it doesn't know
 757          * about a feature in either the compatible or incompatible
 758          * feature set, it must abort and not try to meddle with
 759          * things it doesn't understand...
 760          */
 761         __le32  s_first_ino;            /* First non-reserved inode */
 762         __le16  s_inode_size;           /* size of inode structure */
 763         __le16  s_block_group_nr;       /* block group # of this superblock */
 764         __le32  s_feature_compat;       /* compatible feature set */
 765 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 766         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 767 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 768 /*78*/  char    s_volume_name[16];      /* volume name */
 769 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 770 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 771         /*
 772          * Performance hints.  Directory preallocation should only
 773          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 774          */
 775         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 776         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 777         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 778         /*
 779          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 780          */
 781 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 782 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 783         __le32  s_journal_dev;          /* device number of journal file */
 784         __le32  s_last_orphan;          /* start of list of inodes to delete */
 785         __le32  s_hash_seed[4];         /* HTREE hash seed */
 786         __u8    s_def_hash_version;     /* Default hash version to use */
 787         __u8    s_reserved_char_pad;
 788         __le16  s_desc_size;            /* size of group descriptor */
 789 /*100*/ __le32  s_default_mount_opts;
 790         __le32  s_first_meta_bg;        /* First metablock block group */
 791         __le32  s_mkfs_time;            /* When the filesystem was created */
 792         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 793         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 794 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 795         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 796         __le32  s_free_blocks_count_hi; /* Free blocks count */
 797         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
 798         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
 799         __le32  s_flags;                /* Miscellaneous flags */
 800         __le16  s_raid_stride;          /* RAID stride */
 801         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
 802         __le64  s_mmp_block;            /* Block for multi-mount protection */
 803         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 804         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
 805         __u8    s_reserved_char_pad2;
 806         __le16  s_reserved_pad;
 807         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
 808         __u32   s_reserved[160];        /* Padding to the end of the block */
 809 };
 810
 811 #ifdef __KERNEL__
 812 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
 813 {
 814         return sb->s_fs_info;
 815 }
 816 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 817 {
 818         return container_of(inode, struct ext4_inode_info, vfs_inode);
 819 }
 820
 821 static inline struct timespec ext4_current_time(struct inode *inode)
 822 {
 823         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 824                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 825 }
 826
 827
 828 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 829 {
 830         return ino == EXT4_ROOT_INO ||
 831                 ino == EXT4_JOURNAL_INO ||
 832                 ino == EXT4_RESIZE_INO ||
 833                 (ino >= EXT4_FIRST_INO(sb) &&
 834                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 835 }
 836 #else
 837 /* Assume that user mode programs are passing in an ext4fs superblock, not
 838  * a kernel struct super_block.  This will allow us to call the feature-test
 839  * macros from user land. */
 840 #define EXT4_SB(sb)     (sb)
 841 #endif
 842
 843 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 844
 845 /*
 846  * Codes for operating systems
 847  */
 848 #define EXT4_OS_LINUX           0
 849 #define EXT4_OS_HURD            1
 850 #define EXT4_OS_MASIX           2
 851 #define EXT4_OS_FREEBSD         3
 852 #define EXT4_OS_LITES           4
 853
 854 /*
 855  * Revision levels
 856  */
 857 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 858 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 859
 860 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 861 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 862
 863 #define EXT4_GOOD_OLD_INODE_SIZE 128
 864
 865 /*
 866  * Feature set definitions
 867  */
 868
 869 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 870         ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
 871 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 872         ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
 873 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 874         ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
 875 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 876         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 877 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 878         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 879 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 880         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 881 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 882         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 883 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 884         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 885 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 886         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 887
 888 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 889 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 890 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 891 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 892 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 893 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 894
 895 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 896 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 897 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 898 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
 899 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
 900 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 901 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 902
 903 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 904 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 905 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 906 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 907 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 908 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 909 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 910 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
 911 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
 912
 913 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 914 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 915                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 916                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 917                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 918                                          EXT4_FEATURE_INCOMPAT_64BIT| \
 919                                          EXT4_FEATURE_INCOMPAT_FLEX_BG)
 920 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 921                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 922                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
 923                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 924                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 925                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
 926                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
 927
 928 /*
 929  * Default values for user and/or group using reserved blocks
 930  */
 931 #define EXT4_DEF_RESUID         0
 932 #define EXT4_DEF_RESGID         0
 933
 934 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
 935
 936 /*
 937  * Default mount options
 938  */
 939 #define EXT4_DEFM_DEBUG         0x0001
 940 #define EXT4_DEFM_BSDGROUPS     0x0002
 941 #define EXT4_DEFM_XATTR_USER    0x0004
 942 #define EXT4_DEFM_ACL           0x0008
 943 #define EXT4_DEFM_UID16         0x0010
 944 #define EXT4_DEFM_JMODE         0x0060
 945 #define EXT4_DEFM_JMODE_DATA    0x0020
 946 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 947 #define EXT4_DEFM_JMODE_WBACK   0x0060
 948
 949 /*
 950  * Default journal batch times
 951  */
 952 #define EXT4_DEF_MIN_BATCH_TIME 0
 953 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
 954
 955 /*
 956  * Minimum number of groups in a flexgroup before we separate out
 957  * directories into the first block group of a flexgroup
 958  */
 959 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
 960
 961 /*
 962  * Structure of a directory entry
 963  */
 964 #define EXT4_NAME_LEN 255
 965
 966 struct ext4_dir_entry {
 967         __le32  inode;                  /* Inode number */
 968         __le16  rec_len;                /* Directory entry length */
 969         __le16  name_len;               /* Name length */
 970         char    name[EXT4_NAME_LEN];    /* File name */
 971 };
 972
 973 /*
 974  * The new version of the directory entry.  Since EXT4 structures are
 975  * stored in intel byte order, and the name_len field could never be
 976  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 977  * file_type field.
 978  */
 979 struct ext4_dir_entry_2 {
 980         __le32  inode;                  /* Inode number */
 981         __le16  rec_len;                /* Directory entry length */
 982         __u8    name_len;               /* Name length */
 983         __u8    file_type;
 984         char    name[EXT4_NAME_LEN];    /* File name */
 985 };
 986
 987 /*
 988  * Ext4 directory file types.  Only the low 3 bits are used.  The
 989  * other bits are reserved for now.
 990  */
 991 #define EXT4_FT_UNKNOWN         0
 992 #define EXT4_FT_REG_FILE        1
 993 #define EXT4_FT_DIR             2
 994 #define EXT4_FT_CHRDEV          3
 995 #define EXT4_FT_BLKDEV          4
 996 #define EXT4_FT_FIFO            5
 997 #define EXT4_FT_SOCK            6
 998 #define EXT4_FT_SYMLINK         7
 999
1000 #define EXT4_FT_MAX             8
1001
1002 /*
1003  * EXT4_DIR_PAD defines the directory entries boundaries
1004  *
1005  * NOTE: It must be a multiple of 4
1006  */
1007 #define EXT4_DIR_PAD                    4
1008 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1009 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1010                                          ~EXT4_DIR_ROUND)
1011 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1012
1013 /*
1014  * Hash Tree Directory indexing
1015  * (c) Daniel Phillips, 2001
1016  */
1017
1018 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1019                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1020                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1021 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1022 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1023
1024 /* Legal values for the dx_root hash_version field: */
1025
1026 #define DX_HASH_LEGACY          0
1027 #define DX_HASH_HALF_MD4        1
1028 #define DX_HASH_TEA             2
1029 #define DX_HASH_LEGACY_UNSIGNED 3
1030 #define DX_HASH_HALF_MD4_UNSIGNED       4
1031 #define DX_HASH_TEA_UNSIGNED            5
1032
1033 #ifdef __KERNEL__
1034
1035 /* hash info structure used by the directory hash */
1036 struct dx_hash_info
1037 {
1038         u32             hash;
1039         u32             minor_hash;
1040         int             hash_version;
1041         u32             *seed;
1042 };
1043
1044 #define EXT4_HTREE_EOF  0x7fffffff
1045
1046 /*
1047  * Control parameters used by ext4_htree_next_block
1048  */
1049 #define HASH_NB_ALWAYS          1
1050
1051
1052 /*
1053  * Describe an inode's exact location on disk and in memory
1054  */
1055 struct ext4_iloc
1056 {
1057         struct buffer_head *bh;
1058         unsigned long offset;
1059         ext4_group_t block_group;
1060 };
1061
1062 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1063 {
1064         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1065 }
1066
1067 /*
1068  * This structure is stuffed into the struct file's private_data field
1069  * for directories.  It is where we put information so that we can do
1070  * readdir operations in hash tree order.
1071  */
1072 struct dir_private_info {
1073         struct rb_root  root;
1074         struct rb_node  *curr_node;
1075         struct fname    *extra_fname;
1076         loff_t          last_pos;
1077         __u32           curr_hash;
1078         __u32           curr_minor_hash;
1079         __u32           next_hash;
1080 };
1081
1082 /* calculate the first block number of the group */
1083 static inline ext4_fsblk_t
1084 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1085 {
1086         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1087                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1088 }
1089
1090 /*
1091  * Special error return code only used by dx_probe() and its callers.
1092  */
1093 #define ERR_BAD_DX_DIR  -75000
1094
1095 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1096                         ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1097
1098 extern struct proc_dir_entry *ext4_proc_root;
1099
1100 /*
1101  * Function prototypes
1102  */
1103
1104 /*
1105  * Ok, these declarations are also in <linux/kernel.h> but none of the
1106  * ext4 source programs needs to include it so they are duplicated here.
1107  */
1108 # define NORET_TYPE     /**/
1109 # define ATTRIB_NORET   __attribute__((noreturn))
1110 # define NORET_AND      noreturn,
1111
1112 /* bitmap.c */
1113 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1114
1115 /* balloc.c */
1116 extern unsigned int ext4_block_group(struct super_block *sb,
1117                         ext4_fsblk_t blocknr);
1118 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1119                         ext4_fsblk_t blocknr);
1120 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1121 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1122                         ext4_group_t group);
1123 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1124                         ext4_fsblk_t goal, unsigned long *count, int *errp);
1125 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1126 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1127 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1128                         ext4_fsblk_t block, unsigned long count, int metadata);
1129 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1130                                 ext4_fsblk_t block, unsigned long count);
1131 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1132 extern void ext4_check_blocks_bitmap(struct super_block *);
1133 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1134                                                     ext4_group_t block_group,
1135                                                     struct buffer_head ** bh);
1136 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1137
1138 /* dir.c */
1139 extern int ext4_check_dir_entry(const char *, struct inode *,
1140                                 struct ext4_dir_entry_2 *,
1141                                 struct buffer_head *, unsigned int);
1142 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1143                                     __u32 minor_hash,
1144                                     struct ext4_dir_entry_2 *dirent);
1145 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1146
1147 /* fsync.c */
1148 extern int ext4_sync_file(struct file *, struct dentry *, int);
1149
1150 /* hash.c */
1151 extern int ext4fs_dirhash(const char *name, int len, struct
1152                           dx_hash_info *hinfo);
1153
1154 /* ialloc.c */
1155 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1156 extern void ext4_free_inode(handle_t *, struct inode *);
1157 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1158 extern unsigned long ext4_count_free_inodes(struct super_block *);
1159 extern unsigned long ext4_count_dirs(struct super_block *);
1160 extern void ext4_check_inodes_bitmap(struct super_block *);
1161
1162 /* mballoc.c */
1163 extern long ext4_mb_stats;
1164 extern long ext4_mb_max_to_scan;
1165 extern int ext4_mb_init(struct super_block *, int);
1166 extern int ext4_mb_release(struct super_block *);
1167 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1168                                 struct ext4_allocation_request *, int *);
1169 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1170 extern void ext4_discard_preallocations(struct inode *);
1171 extern int __init init_ext4_mballoc(void);
1172 extern void exit_ext4_mballoc(void);
1173 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1174                 unsigned long, unsigned long, int, unsigned long *);
1175 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1176                 ext4_group_t i, struct ext4_group_desc *desc);
1177 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1178                 ext4_grpblk_t add);
1179 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1180 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1181                                                 ext4_group_t, int);
1182 /* inode.c */
1183 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1184                 struct buffer_head *bh, ext4_fsblk_t blocknr);
1185 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1186                                                 ext4_lblk_t, int, int *);
1187 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1188                                                 ext4_lblk_t, int, int *);
1189 int ext4_get_block(struct inode *inode, sector_t iblock,
1190                                 struct buffer_head *bh_result, int create);
1191
1192 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1193 extern int  ext4_write_inode(struct inode *, int);
1194 extern int  ext4_setattr(struct dentry *, struct iattr *);
1195 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1196                                 struct kstat *stat);
1197 extern void ext4_delete_inode(struct inode *);
1198 extern int  ext4_sync_inode(handle_t *, struct inode *);
1199 extern void ext4_dirty_inode(struct inode *);
1200 extern int ext4_change_inode_journal_flag(struct inode *, int);
1201 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1202 extern int ext4_can_truncate(struct inode *inode);
1203 extern void ext4_truncate(struct inode *);
1204 extern void ext4_set_inode_flags(struct inode *);
1205 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1206 extern int ext4_alloc_da_blocks(struct inode *inode);
1207 extern void ext4_set_aops(struct inode *inode);
1208 extern int ext4_writepage_trans_blocks(struct inode *);
1209 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1210 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1211 extern int ext4_block_truncate_page(handle_t *handle,
1212                 struct address_space *mapping, loff_t from);
1213 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1214 extern qsize_t ext4_get_reserved_space(struct inode *inode);
1215
1216 /* ioctl.c */
1217 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1218 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1219
1220 /* migrate.c */
1221 extern int ext4_ext_migrate(struct inode *);
1222
1223 /* namei.c */
1224 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1225 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1226 extern int ext4_orphan_add(handle_t *, struct inode *);
1227 extern int ext4_orphan_del(handle_t *, struct inode *);
1228 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1229                                 __u32 start_minor_hash, __u32 *next_hash);
1230
1231 /* resize.c */
1232 extern int ext4_group_add(struct super_block *sb,
1233                                 struct ext4_new_group_data *input);
1234 extern int ext4_group_extend(struct super_block *sb,
1235                                 struct ext4_super_block *es,
1236                                 ext4_fsblk_t n_blocks_count);
1237
1238 /* super.c */
1239 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1240         __attribute__ ((format (printf, 3, 4)));
1241 extern void __ext4_std_error(struct super_block *, const char *, int);
1242 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1243         __attribute__ ((format (printf, 3, 4)));
1244 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1245         __attribute__ ((format (printf, 3, 4)));
1246 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1247                                 const char *, const char *, ...)
1248         __attribute__ ((format (printf, 4, 5)));
1249 extern void ext4_update_dynamic_rev(struct super_block *sb);
1250 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1251                                         __u32 compat);
1252 extern int ext4_update_rocompat_feature(handle_t *handle,
1253                                         struct super_block *sb, __u32 rocompat);
1254 extern int ext4_update_incompat_feature(handle_t *handle,
1255                                         struct super_block *sb, __u32 incompat);
1256 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1257                                       struct ext4_group_desc *bg);
1258 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1259                                       struct ext4_group_desc *bg);
1260 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1261                                      struct ext4_group_desc *bg);
1262 extern __u32 ext4_free_blks_count(struct super_block *sb,
1263                                 struct ext4_group_desc *bg);
1264 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1265                                  struct ext4_group_desc *bg);
1266 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1267                                 struct ext4_group_desc *bg);
1268 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1269                                    struct ext4_group_desc *bg);
1270 extern void ext4_block_bitmap_set(struct super_block *sb,
1271                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1272 extern void ext4_inode_bitmap_set(struct super_block *sb,
1273                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1274 extern void ext4_inode_table_set(struct super_block *sb,
1275                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1276 extern void ext4_free_blks_set(struct super_block *sb,
1277                                struct ext4_group_desc *bg, __u32 count);
1278 extern void ext4_free_inodes_set(struct super_block *sb,
1279                                 struct ext4_group_desc *bg, __u32 count);
1280 extern void ext4_used_dirs_set(struct super_block *sb,
1281                                 struct ext4_group_desc *bg, __u32 count);
1282 extern void ext4_itable_unused_set(struct super_block *sb,
1283                                    struct ext4_group_desc *bg, __u32 count);
1284
1285 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1286 {
1287         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1288                 le32_to_cpu(es->s_blocks_count_lo);
1289 }
1290
1291 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1292 {
1293         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1294                 le32_to_cpu(es->s_r_blocks_count_lo);
1295 }
1296
1297 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1298 {
1299         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1300                 le32_to_cpu(es->s_free_blocks_count_lo);
1301 }
1302
1303 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1304                                          ext4_fsblk_t blk)
1305 {
1306         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1307         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1308 }
1309
1310 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1311                                               ext4_fsblk_t blk)
1312 {
1313         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1314         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1315 }
1316
1317 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1318                                            ext4_fsblk_t blk)
1319 {
1320         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1321         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1322 }
1323
1324 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1325 {
1326         if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1327                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1328                         le32_to_cpu(raw_inode->i_size_lo);
1329         else
1330                 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1331 }
1332
1333 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1334 {
1335         raw_inode->i_size_lo = cpu_to_le32(i_size);
1336         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1337 }
1338
1339 static inline
1340 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1341                                             ext4_group_t group)
1342 {
1343          struct ext4_group_info ***grp_info;
1344          long indexv, indexh;
1345          grp_info = EXT4_SB(sb)->s_group_info;
1346          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1347          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1348          return grp_info[indexv][indexh];
1349 }
1350
1351 /*
1352  * Reading s_groups_count requires using smp_rmb() afterwards.  See
1353  * the locking protocol documented in the comments of ext4_group_add()
1354  * in resize.c
1355  */
1356 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1357 {
1358         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
1359
1360         smp_rmb();
1361         return ngroups;
1362 }
1363
1364 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1365                                              ext4_group_t block_group)
1366 {
1367         return block_group >> sbi->s_log_groups_per_flex;
1368 }
1369
1370 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1371 {
1372         return 1 << sbi->s_log_groups_per_flex;
1373 }
1374
1375 #define ext4_std_error(sb, errno)                               \
1376 do {                                                            \
1377         if ((errno))                                            \
1378                 __ext4_std_error((sb), __func__, (errno));      \
1379 } while (0)
1380
1381 #ifdef CONFIG_SMP
1382 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1383  * counters. So we need to make sure we have free blocks more
1384  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
1385  */
1386 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1387 #else
1388 #define EXT4_FREEBLOCKS_WATERMARK 0
1389 #endif
1390
1391 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1392 {
1393         /*
1394          * XXX: replace with spinlock if seen contended -bzzz
1395          */
1396         down_write(&EXT4_I(inode)->i_data_sem);
1397         if (newsize > EXT4_I(inode)->i_disksize)
1398                 EXT4_I(inode)->i_disksize = newsize;
1399         up_write(&EXT4_I(inode)->i_data_sem);
1400         return ;
1401 }
1402
1403 struct ext4_group_info {
1404         unsigned long   bb_state;
1405         struct rb_root  bb_free_root;
1406         unsigned short  bb_first_free;
1407         unsigned short  bb_free;
1408         unsigned short  bb_fragments;
1409         struct          list_head bb_prealloc_list;
1410 #ifdef DOUBLE_CHECK
1411         void            *bb_bitmap;
1412 #endif
1413         struct rw_semaphore alloc_sem;
1414         unsigned short  bb_counters[];
1415 };
1416
1417 #define EXT4_GROUP_INFO_NEED_INIT_BIT   0
1418 #define EXT4_GROUP_INFO_LOCKED_BIT      1
1419
1420 #define EXT4_MB_GRP_NEED_INIT(grp)      \
1421         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1422
1423 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1424 {
1425         struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1426
1427         bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1428 }
1429
1430 static inline void ext4_unlock_group(struct super_block *sb,
1431                                         ext4_group_t group)
1432 {
1433         struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1434
1435         bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1436 }
1437
1438 static inline int ext4_is_group_locked(struct super_block *sb,
1439                                         ext4_group_t group)
1440 {
1441         struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1442
1443         return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
1444                                                 &(grinfo->bb_state));
1445 }
1446
1447 /*
1448  * Inodes and files operations
1449  */
1450
1451 /* dir.c */
1452 extern const struct file_operations ext4_dir_operations;
1453
1454 /* file.c */
1455 extern const struct inode_operations ext4_file_inode_operations;
1456 extern const struct file_operations ext4_file_operations;
1457
1458 /* namei.c */
1459 extern const struct inode_operations ext4_dir_inode_operations;
1460 extern const struct inode_operations ext4_special_inode_operations;
1461
1462 /* symlink.c */
1463 extern const struct inode_operations ext4_symlink_inode_operations;
1464 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1465
1466 /* extents.c */
1467 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1468 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1469 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1470                                        int chunk);
1471 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1472                                ext4_lblk_t iblock, unsigned int max_blocks,
1473                                struct buffer_head *bh_result,
1474                                int create, int extend_disksize);
1475 extern void ext4_ext_truncate(struct inode *);
1476 extern void ext4_ext_init(struct super_block *);
1477 extern void ext4_ext_release(struct super_block *);
1478 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1479                           loff_t len);
1480 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1481                         sector_t block, unsigned int max_blocks,
1482                         struct buffer_head *bh, int create,
1483                         int extend_disksize, int flag);
1484 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1485                         __u64 start, __u64 len);
1486
1487 /*
1488  * Add new method to test wether block and inode bitmaps are properly
1489  * initialized. With uninit_bg reading the block from disk is not enough
1490  * to mark the bitmap uptodate. We need to also zero-out the bitmap
1491  */
1492 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1493
1494 static inline int bitmap_uptodate(struct buffer_head *bh)
1495 {
1496         return (buffer_uptodate(bh) &&
1497                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1498 }
1499 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1500 {
1501         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1502 }
1503
1504 #endif  /* __KERNEL__ */
1505
1506 #endif  /* _EXT4_H */