linux/fs/logfs/logfs_abi.h
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   1/*
   2 * fs/logfs/logfs_abi.h
   3 *
   4 * As should be obvious for Linux kernel code, license is GPLv2
   5 *
   6 * Copyright (c) 2005-2008 Joern Engel <joern@logfs.org>
   7 *
   8 * Public header for logfs.
   9 */
  10#ifndef FS_LOGFS_LOGFS_ABI_H
  11#define FS_LOGFS_LOGFS_ABI_H
  12
  13/* For out-of-kernel compiles */
  14#ifndef BUILD_BUG_ON
  15#define BUILD_BUG_ON(condition) /**/
  16#endif
  17
  18#define SIZE_CHECK(type, size)                                  \
  19static inline void check_##type(void)                           \
  20{                                                               \
  21        BUILD_BUG_ON(sizeof(struct type) != (size));            \
  22}
  23
  24/*
  25 * Throughout the logfs code, we're constantly dealing with blocks at
  26 * various positions or offsets.  To remove confusion, we stricly
  27 * distinguish between a "position" - the logical position within a
  28 * file and an "offset" - the physical location within the device.
  29 *
  30 * Any usage of the term offset for a logical location or position for
  31 * a physical one is a bug and should get fixed.
  32 */
  33
  34/*
  35 * Block are allocated in one of several segments depending on their
  36 * level.  The following levels are used:
  37 *  0   - regular data block
  38 *  1   - i1 indirect blocks
  39 *  2   - i2 indirect blocks
  40 *  3   - i3 indirect blocks
  41 *  4   - i4 indirect blocks
  42 *  5   - i5 indirect blocks
  43 *  6   - ifile data blocks
  44 *  7   - ifile i1 indirect blocks
  45 *  8   - ifile i2 indirect blocks
  46 *  9   - ifile i3 indirect blocks
  47 * 10   - ifile i4 indirect blocks
  48 * 11   - ifile i5 indirect blocks
  49 * Potential levels to be used in the future:
  50 * 12   - gc recycled blocks, long-lived data
  51 * 13   - replacement blocks, short-lived data
  52 *
  53 * Levels 1-11 are necessary for robust gc operations and help separate
  54 * short-lived metadata from longer-lived file data.  In the future,
  55 * file data should get separated into several segments based on simple
  56 * heuristics.  Old data recycled during gc operation is expected to be
  57 * long-lived.  New data is of uncertain life expectancy.  New data
  58 * used to replace older blocks in existing files is expected to be
  59 * short-lived.
  60 */
  61
  62
  63/* Magic numbers.  64bit for superblock, 32bit for statfs f_type */
  64#define LOGFS_MAGIC             0x7a3a8e5cb9d5bf67ull
  65#define LOGFS_MAGIC_U32         0xc97e8168u
  66
  67/*
  68 * Various blocksize related macros.  Blocksize is currently fixed at 4KiB.
  69 * Sooner or later that should become configurable and the macros replaced
  70 * by something superblock-dependent.  Pointers in indirect blocks are and
  71 * will remain 64bit.
  72 *
  73 * LOGFS_BLOCKSIZE      - self-explaining
  74 * LOGFS_BLOCK_FACTOR   - number of pointers per indirect block
  75 * LOGFS_BLOCK_BITS     - log2 of LOGFS_BLOCK_FACTOR, used for shifts
  76 */
  77#define LOGFS_BLOCKSIZE         (4096ull)
  78#define LOGFS_BLOCK_FACTOR      (LOGFS_BLOCKSIZE / sizeof(u64))
  79#define LOGFS_BLOCK_BITS        (9)
  80
  81/*
  82 * Number of blocks at various levels of indirection.  There are 16 direct
  83 * block pointers plus a single indirect pointer.
  84 */
  85#define I0_BLOCKS               (16)
  86#define I1_BLOCKS               LOGFS_BLOCK_FACTOR
  87#define I2_BLOCKS               (LOGFS_BLOCK_FACTOR * I1_BLOCKS)
  88#define I3_BLOCKS               (LOGFS_BLOCK_FACTOR * I2_BLOCKS)
  89#define I4_BLOCKS               (LOGFS_BLOCK_FACTOR * I3_BLOCKS)
  90#define I5_BLOCKS               (LOGFS_BLOCK_FACTOR * I4_BLOCKS)
  91
  92#define INDIRECT_INDEX          I0_BLOCKS
  93#define LOGFS_EMBEDDED_FIELDS   (I0_BLOCKS + 1)
  94
  95/*
  96 * Sizes at which files require another level of indirection.  Files smaller
  97 * than LOGFS_EMBEDDED_SIZE can be completely stored in the inode itself,
  98 * similar like ext2 fast symlinks.
  99 *
 100 * Data at a position smaller than LOGFS_I0_SIZE is accessed through the
 101 * direct pointers, else through the 1x indirect pointer and so forth.
 102 */
 103#define LOGFS_EMBEDDED_SIZE     (LOGFS_EMBEDDED_FIELDS * sizeof(u64))
 104#define LOGFS_I0_SIZE           (I0_BLOCKS * LOGFS_BLOCKSIZE)
 105#define LOGFS_I1_SIZE           (I1_BLOCKS * LOGFS_BLOCKSIZE)
 106#define LOGFS_I2_SIZE           (I2_BLOCKS * LOGFS_BLOCKSIZE)
 107#define LOGFS_I3_SIZE           (I3_BLOCKS * LOGFS_BLOCKSIZE)
 108#define LOGFS_I4_SIZE           (I4_BLOCKS * LOGFS_BLOCKSIZE)
 109#define LOGFS_I5_SIZE           (I5_BLOCKS * LOGFS_BLOCKSIZE)
 110
 111/*
 112 * Each indirect block pointer must have this flag set, if all block pointers
 113 * behind it are set, i.e. there is no hole hidden in the shadow of this
 114 * indirect block pointer.
 115 */
 116#define LOGFS_FULLY_POPULATED (1ULL << 63)
 117#define pure_ofs(ofs) (ofs & ~LOGFS_FULLY_POPULATED)
 118
 119/*
 120 * LogFS needs to separate data into levels.  Each level is defined as the
 121 * maximal possible distance from the master inode (inode of the inode file).
 122 * Data blocks reside on level 0, 1x indirect block on level 1, etc.
 123 * Inodes reside on level 6, indirect blocks for the inode file on levels 7-11.
 124 * This effort is necessary to guarantee garbage collection to always make
 125 * progress.
 126 *
 127 * LOGFS_MAX_INDIRECT is the maximal indirection through indirect blocks,
 128 * LOGFS_MAX_LEVELS is one more for the actual data level of a file.  It is
 129 * the maximal number of levels for one file.
 130 * LOGFS_NO_AREAS is twice that, as the inode file and regular files are
 131 * effectively stacked on top of each other.
 132 */
 133#define LOGFS_MAX_INDIRECT      (5)
 134#define LOGFS_MAX_LEVELS        (LOGFS_MAX_INDIRECT + 1)
 135#define LOGFS_NO_AREAS          (2 * LOGFS_MAX_LEVELS)
 136
 137/* Maximum size of filenames */
 138#define LOGFS_MAX_NAMELEN       (255)
 139
 140/* Number of segments in the primary journal. */
 141#define LOGFS_JOURNAL_SEGS      (16)
 142
 143/* Maximum number of free/erased/etc. segments in journal entries */
 144#define MAX_CACHED_SEGS         (64)
 145
 146
 147/*
 148 * LOGFS_OBJECT_HEADERSIZE is the size of a single header in the object store,
 149 * LOGFS_MAX_OBJECTSIZE the size of the largest possible object, including
 150 * its header,
 151 * LOGFS_SEGMENT_RESERVE is the amount of space reserved for each segment for
 152 * its segment header and the padded space at the end when no further objects
 153 * fit.
 154 */
 155#define LOGFS_OBJECT_HEADERSIZE (0x1c)
 156#define LOGFS_SEGMENT_HEADERSIZE (0x18)
 157#define LOGFS_MAX_OBJECTSIZE    (LOGFS_OBJECT_HEADERSIZE + LOGFS_BLOCKSIZE)
 158#define LOGFS_SEGMENT_RESERVE   \
 159        (LOGFS_SEGMENT_HEADERSIZE + LOGFS_MAX_OBJECTSIZE - 1)
 160
 161/*
 162 * Segment types:
 163 * SEG_SUPER    - Data or indirect block
 164 * SEG_JOURNAL  - Inode
 165 * SEG_OSTORE   - Dentry
 166 */
 167enum {
 168        SEG_SUPER       = 0x01,
 169        SEG_JOURNAL     = 0x02,
 170        SEG_OSTORE      = 0x03,
 171};
 172
 173/**
 174 * struct logfs_segment_header - per-segment header in the ostore
 175 *
 176 * @crc:                        crc32 of header (there is no data)
 177 * @pad:                        unused, must be 0
 178 * @type:                       segment type, see above
 179 * @level:                      GC level for all objects in this segment
 180 * @segno:                      segment number
 181 * @ec:                         erase count for this segment
 182 * @gec:                        global erase count at time of writing
 183 */
 184struct logfs_segment_header {
 185        __be32  crc;
 186        __be16  pad;
 187        __u8    type;
 188        __u8    level;
 189        __be32  segno;
 190        __be32  ec;
 191        __be64  gec;
 192};
 193
 194SIZE_CHECK(logfs_segment_header, LOGFS_SEGMENT_HEADERSIZE);
 195
 196#define LOGFS_FEATURES_INCOMPAT         (0ull)
 197#define LOGFS_FEATURES_RO_COMPAT        (0ull)
 198#define LOGFS_FEATURES_COMPAT           (0ull)
 199
 200/**
 201 * struct logfs_disk_super - on-medium superblock
 202 *
 203 * @ds_magic:                   magic number, must equal LOGFS_MAGIC
 204 * @ds_crc:                     crc32 of structure starting with the next field
 205 * @ds_ifile_levels:            maximum number of levels for ifile
 206 * @ds_iblock_levels:           maximum number of levels for regular files
 207 * @ds_data_levels:             number of separate levels for data
 208 * @pad0:                       reserved, must be 0
 209 * @ds_feature_incompat:        incompatible filesystem features
 210 * @ds_feature_ro_compat:       read-only compatible filesystem features
 211 * @ds_feature_compat:          compatible filesystem features
 212 * @ds_flags:                   flags
 213 * @ds_segment_shift:           log2 of segment size
 214 * @ds_block_shift:             log2 of block size
 215 * @ds_write_shift:             log2 of write size
 216 * @pad1:                       reserved, must be 0
 217 * @ds_journal_seg:             segments used by primary journal
 218 * @ds_root_reserve:            bytes reserved for the superuser
 219 * @ds_speed_reserve:           bytes reserved to speed up GC
 220 * @ds_bad_seg_reserve:         number of segments reserved to handle bad blocks
 221 * @pad2:                       reserved, must be 0
 222 * @pad3:                       reserved, must be 0
 223 *
 224 * Contains only read-only fields.  Read-write fields like the amount of used
 225 * space is tracked in the dynamic superblock, which is stored in the journal.
 226 */
 227struct logfs_disk_super {
 228        struct logfs_segment_header ds_sh;
 229        __be64  ds_magic;
 230
 231        __be32  ds_crc;
 232        __u8    ds_ifile_levels;
 233        __u8    ds_iblock_levels;
 234        __u8    ds_data_levels;
 235        __u8    ds_segment_shift;
 236        __u8    ds_block_shift;
 237        __u8    ds_write_shift;
 238        __u8    pad0[6];
 239
 240        __be64  ds_filesystem_size;
 241        __be32  ds_segment_size;
 242        __be32  ds_bad_seg_reserve;
 243
 244        __be64  ds_feature_incompat;
 245        __be64  ds_feature_ro_compat;
 246
 247        __be64  ds_feature_compat;
 248        __be64  ds_feature_flags;
 249
 250        __be64  ds_root_reserve;
 251        __be64  ds_speed_reserve;
 252
 253        __be32  ds_journal_seg[LOGFS_JOURNAL_SEGS];
 254
 255        __be64  ds_super_ofs[2];
 256        __be64  pad3[8];
 257};
 258
 259SIZE_CHECK(logfs_disk_super, 256);
 260
 261/*
 262 * Object types:
 263 * OBJ_BLOCK    - Data or indirect block
 264 * OBJ_INODE    - Inode
 265 * OBJ_DENTRY   - Dentry
 266 */
 267enum {
 268        OBJ_BLOCK       = 0x04,
 269        OBJ_INODE       = 0x05,
 270        OBJ_DENTRY      = 0x06,
 271};
 272
 273/**
 274 * struct logfs_object_header - per-object header in the ostore
 275 *
 276 * @crc:                        crc32 of header, excluding data_crc
 277 * @len:                        length of data
 278 * @type:                       object type, see above
 279 * @compr:                      compression type
 280 * @ino:                        inode number
 281 * @bix:                        block index
 282 * @data_crc:                   crc32 of payload
 283 */
 284struct logfs_object_header {
 285        __be32  crc;
 286        __be16  len;
 287        __u8    type;
 288        __u8    compr;
 289        __be64  ino;
 290        __be64  bix;
 291        __be32  data_crc;
 292} __attribute__((packed));
 293
 294SIZE_CHECK(logfs_object_header, LOGFS_OBJECT_HEADERSIZE);
 295
 296/*
 297 * Reserved inode numbers:
 298 * LOGFS_INO_MASTER     - master inode (for inode file)
 299 * LOGFS_INO_ROOT       - root directory
 300 * LOGFS_INO_SEGFILE    - per-segment used bytes and erase count
 301 */
 302enum {
 303        LOGFS_INO_MAPPING       = 0x00,
 304        LOGFS_INO_MASTER        = 0x01,
 305        LOGFS_INO_ROOT          = 0x02,
 306        LOGFS_INO_SEGFILE       = 0x03,
 307        LOGFS_RESERVED_INOS     = 0x10,
 308};
 309
 310/*
 311 * Inode flags.  High bits should never be written to the medium.  They are
 312 * reserved for in-memory usage.
 313 * Low bits should either remain in sync with the corresponding FS_*_FL or
 314 * reuse slots that obviously don't make sense for logfs.
 315 *
 316 * LOGFS_IF_DIRTY       Inode must be written back
 317 * LOGFS_IF_ZOMBIE      Inode has been deleted
 318 * LOGFS_IF_STILLBORN   -ENOSPC happened when creating inode
 319 */
 320#define LOGFS_IF_COMPRESSED     0x00000004 /* == FS_COMPR_FL */
 321#define LOGFS_IF_DIRTY          0x20000000
 322#define LOGFS_IF_ZOMBIE         0x40000000
 323#define LOGFS_IF_STILLBORN      0x80000000
 324
 325/* Flags available to chattr */
 326#define LOGFS_FL_USER_VISIBLE   (LOGFS_IF_COMPRESSED)
 327#define LOGFS_FL_USER_MODIFIABLE (LOGFS_IF_COMPRESSED)
 328/* Flags inherited from parent directory on file/directory creation */
 329#define LOGFS_FL_INHERITED      (LOGFS_IF_COMPRESSED)
 330
 331/**
 332 * struct logfs_disk_inode - on-medium inode
 333 *
 334 * @di_mode:                    file mode
 335 * @di_pad:                     reserved, must be 0
 336 * @di_flags:                   inode flags, see above
 337 * @di_uid:                     user id
 338 * @di_gid:                     group id
 339 * @di_ctime:                   change time
 340 * @di_mtime:                   modify time
 341 * @di_refcount:                reference count (aka nlink or link count)
 342 * @di_generation:              inode generation, for nfs
 343 * @di_used_bytes:              number of bytes used
 344 * @di_size:                    file size
 345 * @di_data:                    data pointers
 346 */
 347struct logfs_disk_inode {
 348        __be16  di_mode;
 349        __u8    di_height;
 350        __u8    di_pad;
 351        __be32  di_flags;
 352        __be32  di_uid;
 353        __be32  di_gid;
 354
 355        __be64  di_ctime;
 356        __be64  di_mtime;
 357
 358        __be64  di_atime;
 359        __be32  di_refcount;
 360        __be32  di_generation;
 361
 362        __be64  di_used_bytes;
 363        __be64  di_size;
 364
 365        __be64  di_data[LOGFS_EMBEDDED_FIELDS];
 366};
 367
 368SIZE_CHECK(logfs_disk_inode, 200);
 369
 370#define INODE_POINTER_OFS \
 371        (offsetof(struct logfs_disk_inode, di_data) / sizeof(__be64))
 372#define INODE_USED_OFS \
 373        (offsetof(struct logfs_disk_inode, di_used_bytes) / sizeof(__be64))
 374#define INODE_SIZE_OFS \
 375        (offsetof(struct logfs_disk_inode, di_size) / sizeof(__be64))
 376#define INODE_HEIGHT_OFS        (0)
 377
 378/**
 379 * struct logfs_disk_dentry - on-medium dentry structure
 380 *
 381 * @ino:                        inode number
 382 * @namelen:                    length of file name
 383 * @type:                       file type, identical to bits 12..15 of mode
 384 * @name:                       file name
 385 */
 386/* FIXME: add 6 bytes of padding to remove the __packed */
 387struct logfs_disk_dentry {
 388        __be64  ino;
 389        __be16  namelen;
 390        __u8    type;
 391        __u8    name[LOGFS_MAX_NAMELEN];
 392} __attribute__((packed));
 393
 394SIZE_CHECK(logfs_disk_dentry, 266);
 395
 396#define RESERVED                0xffffffff
 397#define BADSEG                  0xffffffff
 398/**
 399 * struct logfs_segment_entry - segment file entry
 400 *
 401 * @ec_level:                   erase count and level
 402 * @valid:                      number of valid bytes
 403 *
 404 * Segment file contains one entry for every segment.  ec_level contains the
 405 * erasecount in the upper 28 bits and the level in the lower 4 bits.  An
 406 * ec_level of BADSEG (-1) identifies bad segments.  valid contains the number
 407 * of valid bytes or RESERVED (-1 again) if the segment is used for either the
 408 * superblock or the journal, or when the segment is bad.
 409 */
 410struct logfs_segment_entry {
 411        __be32  ec_level;
 412        __be32  valid;
 413};
 414
 415SIZE_CHECK(logfs_segment_entry, 8);
 416
 417/**
 418 * struct logfs_journal_header - header for journal entries (JEs)
 419 *
 420 * @h_crc:                      crc32 of journal entry
 421 * @h_len:                      length of compressed journal entry,
 422 *                              not including header
 423 * @h_datalen:                  length of uncompressed data
 424 * @h_type:                     JE type
 425 * @h_compr:                    compression type
 426 * @h_pad:                      reserved
 427 */
 428struct logfs_journal_header {
 429        __be32  h_crc;
 430        __be16  h_len;
 431        __be16  h_datalen;
 432        __be16  h_type;
 433        __u8    h_compr;
 434        __u8    h_pad[5];
 435};
 436
 437SIZE_CHECK(logfs_journal_header, 16);
 438
 439/*
 440 * Life expectency of data.
 441 * VIM_DEFAULT          - default vim
 442 * VIM_SEGFILE          - for segment file only - very short-living
 443 * VIM_GC               - GC'd data - likely long-living
 444 */
 445enum logfs_vim {
 446        VIM_DEFAULT     = 0,
 447        VIM_SEGFILE     = 1,
 448};
 449
 450/**
 451 * struct logfs_je_area - wbuf header
 452 *
 453 * @segno:                      segment number of area
 454 * @used_bytes:                 number of bytes already used
 455 * @gc_level:                   GC level
 456 * @vim:                        life expectancy of data
 457 *
 458 * "Areas" are segments currently being used for writing.  There is at least
 459 * one area per GC level.  Several may be used to separate long-living from
 460 * short-living data.  If an area with unknown vim is encountered, it can
 461 * simply be closed.
 462 * The write buffer immediately follow this header.
 463 */
 464struct logfs_je_area {
 465        __be32  segno;
 466        __be32  used_bytes;
 467        __u8    gc_level;
 468        __u8    vim;
 469} __attribute__((packed));
 470
 471SIZE_CHECK(logfs_je_area, 10);
 472
 473#define MAX_JOURNAL_HEADER \
 474        (sizeof(struct logfs_journal_header) + sizeof(struct logfs_je_area))
 475
 476/**
 477 * struct logfs_je_dynsb - dynamic superblock
 478 *
 479 * @ds_gec:                     global erase count
 480 * @ds_sweeper:                 current position of GC "sweeper"
 481 * @ds_rename_dir:              source directory ino (see dir.c documentation)
 482 * @ds_rename_pos:              position of source dd (see dir.c documentation)
 483 * @ds_victim_ino:              victims of incomplete dir operation (see dir.c)
 484 * @ds_victim_ino:              parent inode of victim (see dir.c)
 485 * @ds_used_bytes:              number of used bytes
 486 */
 487struct logfs_je_dynsb {
 488        __be64  ds_gec;
 489        __be64  ds_sweeper;
 490
 491        __be64  ds_rename_dir;
 492        __be64  ds_rename_pos;
 493
 494        __be64  ds_victim_ino;
 495        __be64  ds_victim_parent; /* XXX */
 496
 497        __be64  ds_used_bytes;
 498        __be32  ds_generation;
 499        __be32  pad;
 500};
 501
 502SIZE_CHECK(logfs_je_dynsb, 64);
 503
 504/**
 505 * struct logfs_je_anchor - anchor of filesystem tree, aka master inode
 506 *
 507 * @da_size:                    size of inode file
 508 * @da_last_ino:                last created inode
 509 * @da_used_bytes:              number of bytes used
 510 * @da_data:                    data pointers
 511 */
 512struct logfs_je_anchor {
 513        __be64  da_size;
 514        __be64  da_last_ino;
 515
 516        __be64  da_used_bytes;
 517        u8      da_height;
 518        u8      pad[7];
 519
 520        __be64  da_data[LOGFS_EMBEDDED_FIELDS];
 521};
 522
 523SIZE_CHECK(logfs_je_anchor, 168);
 524
 525/**
 526 * struct logfs_je_spillout - spillout entry (from 1st to 2nd journal)
 527 *
 528 * @so_segment:                 segments used for 2nd journal
 529 *
 530 * Length of the array is given by h_len field in the header.
 531 */
 532struct logfs_je_spillout {
 533        __be64  so_segment[0];
 534};
 535
 536SIZE_CHECK(logfs_je_spillout, 0);
 537
 538/**
 539 * struct logfs_je_journal_ec - erase counts for all journal segments
 540 *
 541 * @ec:                         erase count
 542 *
 543 * Length of the array is given by h_len field in the header.
 544 */
 545struct logfs_je_journal_ec {
 546        __be32  ec[0];
 547};
 548
 549SIZE_CHECK(logfs_je_journal_ec, 0);
 550
 551/**
 552 * struct logfs_je_free_segments - list of free segmetns with erase count
 553 */
 554struct logfs_je_free_segments {
 555        __be32  segno;
 556        __be32  ec;
 557};
 558
 559SIZE_CHECK(logfs_je_free_segments, 8);
 560
 561/**
 562 * struct logfs_seg_alias - list of segment aliases
 563 */
 564struct logfs_seg_alias {
 565        __be32  old_segno;
 566        __be32  new_segno;
 567};
 568
 569SIZE_CHECK(logfs_seg_alias, 8);
 570
 571/**
 572 * struct logfs_obj_alias - list of object aliases
 573 */
 574struct logfs_obj_alias {
 575        __be64  ino;
 576        __be64  bix;
 577        __be64  val;
 578        u8      level;
 579        u8      pad[5];
 580        __be16  child_no;
 581};
 582
 583SIZE_CHECK(logfs_obj_alias, 32);
 584
 585/**
 586 * Compression types.
 587 *
 588 * COMPR_NONE   - uncompressed
 589 * COMPR_ZLIB   - compressed with zlib
 590 */
 591enum {
 592        COMPR_NONE      = 0,
 593        COMPR_ZLIB      = 1,
 594};
 595
 596/*
 597 * Journal entries come in groups of 16.  First group contains unique
 598 * entries, next groups contain one entry per level
 599 *
 600 * JE_FIRST     - smallest possible journal entry number
 601 *
 602 * JEG_BASE     - base group, containing unique entries
 603 * JE_COMMIT    - commit entry, validates all previous entries
 604 * JE_DYNSB     - dynamic superblock, anything that ought to be in the
 605 *                superblock but cannot because it is read-write data
 606 * JE_ANCHOR    - anchor aka master inode aka inode file's inode
 607 * JE_ERASECOUNT  erasecounts for all journal segments
 608 * JE_SPILLOUT  - unused
 609 * JE_SEG_ALIAS - aliases segments
 610 * JE_AREA      - area description
 611 *
 612 * JE_LAST      - largest possible journal entry number
 613 */
 614enum {
 615        JE_FIRST        = 0x01,
 616
 617        JEG_BASE        = 0x00,
 618        JE_COMMIT       = 0x02,
 619        JE_DYNSB        = 0x03,
 620        JE_ANCHOR       = 0x04,
 621        JE_ERASECOUNT   = 0x05,
 622        JE_SPILLOUT     = 0x06,
 623        JE_OBJ_ALIAS    = 0x0d,
 624        JE_AREA         = 0x0e,
 625
 626        JE_LAST         = 0x0e,
 627};
 628
 629#endif
 630
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