git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/bkey.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_BKEY_H
   3 #define _BCACHEFS_BKEY_H
   4
   5 #include <linux/bug.h>
   6 #include "bcachefs_format.h"
   7
   8 #include "btree_types.h"
   9 #include "util.h"
  10 #include "vstructs.h"
  11
  12 #ifdef CONFIG_X86_64
  13 #define HAVE_BCACHEFS_COMPILED_UNPACK   1
  14 #endif
  15
  16 void bch2_bkey_packed_to_binary_text(struct printbuf *,
  17                                      const struct bkey_format *,
  18                                      const struct bkey_packed *);
  19
  20 /* bkey with split value, const */
  21 struct bkey_s_c {
  22         const struct bkey       *k;
  23         const struct bch_val    *v;
  24 };
  25
  26 /* bkey with split value */
  27 struct bkey_s {
  28         union {
  29         struct {
  30                 struct bkey     *k;
  31                 struct bch_val  *v;
  32         };
  33         struct bkey_s_c         s_c;
  34         };
  35 };
  36
  37 #define bkey_next(_k)           vstruct_next(_k)
  38
  39 #define bkey_val_u64s(_k)       ((_k)->u64s - BKEY_U64s)
  40
  41 static inline size_t bkey_val_bytes(const struct bkey *k)
  42 {
  43         return bkey_val_u64s(k) * sizeof(u64);
  44 }
  45
  46 static inline void set_bkey_val_u64s(struct bkey *k, unsigned val_u64s)
  47 {
  48         unsigned u64s = BKEY_U64s + val_u64s;
  49
  50         BUG_ON(u64s > U8_MAX);
  51         k->u64s = u64s;
  52 }
  53
  54 static inline void set_bkey_val_bytes(struct bkey *k, unsigned bytes)
  55 {
  56         set_bkey_val_u64s(k, DIV_ROUND_UP(bytes, sizeof(u64)));
  57 }
  58
  59 #define bkey_val_end(_k)        ((void *) (((u64 *) (_k).v) + bkey_val_u64s((_k).k)))
  60
  61 #define bkey_deleted(_k)        ((_k)->type == KEY_TYPE_deleted)
  62
  63 #define bkey_whiteout(_k)                               \
  64         ((_k)->type == KEY_TYPE_deleted || (_k)->type == KEY_TYPE_whiteout)
  65
  66 enum bkey_lr_packed {
  67         BKEY_PACKED_BOTH,
  68         BKEY_PACKED_RIGHT,
  69         BKEY_PACKED_LEFT,
  70         BKEY_PACKED_NONE,
  71 };
  72
  73 #define bkey_lr_packed(_l, _r)                                          \
  74         ((_l)->format + ((_r)->format << 1))
  75
  76 #define bkey_copy(_dst, _src)                                   \
  77 do {                                                            \
  78         BUILD_BUG_ON(!type_is(_dst, struct bkey_i *) &&         \
  79                      !type_is(_dst, struct bkey_packed *));     \
  80         BUILD_BUG_ON(!type_is(_src, struct bkey_i *) &&         \
  81                      !type_is(_src, struct bkey_packed *));     \
  82         EBUG_ON((u64 *) (_dst) > (u64 *) (_src) &&              \
  83                 (u64 *) (_dst) < (u64 *) (_src) +               \
  84                 ((struct bkey *) (_src))->u64s);                \
  85                                                                 \
  86         memcpy_u64s_small((_dst), (_src),                       \
  87                           ((struct bkey *) (_src))->u64s);      \
  88 } while (0)
  89
  90 struct btree;
  91
  92 struct bkey_format_state {
  93         u64 field_min[BKEY_NR_FIELDS];
  94         u64 field_max[BKEY_NR_FIELDS];
  95 };
  96
  97 void bch2_bkey_format_init(struct bkey_format_state *);
  98 void bch2_bkey_format_add_key(struct bkey_format_state *, const struct bkey *);
  99 void bch2_bkey_format_add_pos(struct bkey_format_state *, struct bpos);
 100 struct bkey_format bch2_bkey_format_done(struct bkey_format_state *);
 101 const char *bch2_bkey_format_validate(struct bkey_format *);
 102
 103 __pure
 104 unsigned bch2_bkey_greatest_differing_bit(const struct btree *,
 105                                           const struct bkey_packed *,
 106                                           const struct bkey_packed *);
 107 __pure
 108 unsigned bch2_bkey_ffs(const struct btree *, const struct bkey_packed *);
 109
 110 __pure
 111 int __bch2_bkey_cmp_packed_format_checked(const struct bkey_packed *,
 112                                      const struct bkey_packed *,
 113                                      const struct btree *);
 114
 115 __pure
 116 int __bch2_bkey_cmp_left_packed_format_checked(const struct btree *,
 117                                           const struct bkey_packed *,
 118                                           const struct bpos *);
 119
 120 __pure
 121 int bch2_bkey_cmp_packed(const struct btree *,
 122                          const struct bkey_packed *,
 123                          const struct bkey_packed *);
 124
 125 __pure
 126 int __bch2_bkey_cmp_left_packed(const struct btree *,
 127                                 const struct bkey_packed *,
 128                                 const struct bpos *);
 129
 130 static inline __pure
 131 int bkey_cmp_left_packed(const struct btree *b,
 132                          const struct bkey_packed *l, const struct bpos *r)
 133 {
 134         return __bch2_bkey_cmp_left_packed(b, l, r);
 135 }
 136
 137 /*
 138  * The compiler generates better code when we pass bpos by ref, but it's often
 139  * enough terribly convenient to pass it by val... as much as I hate c++, const
 140  * ref would be nice here:
 141  */
 142 __pure __flatten
 143 static inline int bkey_cmp_left_packed_byval(const struct btree *b,
 144                                              const struct bkey_packed *l,
 145                                              struct bpos r)
 146 {
 147         return bkey_cmp_left_packed(b, l, &r);
 148 }
 149
 150 static __always_inline int bpos_cmp(struct bpos l, struct bpos r)
 151 {
 152         return  cmp_int(l.inode,    r.inode) ?:
 153                 cmp_int(l.offset,   r.offset) ?:
 154                 cmp_int(l.snapshot, r.snapshot);
 155 }
 156
 157 static __always_inline int bkey_cmp(struct bpos l, struct bpos r)
 158 {
 159         return  cmp_int(l.inode,    r.inode) ?:
 160                 cmp_int(l.offset,   r.offset);
 161 }
 162
 163 static inline struct bpos bpos_min(struct bpos l, struct bpos r)
 164 {
 165         return bpos_cmp(l, r) < 0 ? l : r;
 166 }
 167
 168 static inline struct bpos bpos_max(struct bpos l, struct bpos r)
 169 {
 170         return bpos_cmp(l, r) > 0 ? l : r;
 171 }
 172
 173 void bch2_bpos_swab(struct bpos *);
 174 void bch2_bkey_swab_key(const struct bkey_format *, struct bkey_packed *);
 175
 176 static __always_inline int bversion_cmp(struct bversion l, struct bversion r)
 177 {
 178         return  cmp_int(l.hi, r.hi) ?:
 179                 cmp_int(l.lo, r.lo);
 180 }
 181
 182 #define ZERO_VERSION    ((struct bversion) { .hi = 0, .lo = 0 })
 183 #define MAX_VERSION     ((struct bversion) { .hi = ~0, .lo = ~0ULL })
 184
 185 static __always_inline int bversion_zero(struct bversion v)
 186 {
 187         return !bversion_cmp(v, ZERO_VERSION);
 188 }
 189
 190 #ifdef CONFIG_BCACHEFS_DEBUG
 191 /* statement expressions confusing unlikely()? */
 192 #define bkey_packed(_k)                                                 \
 193         ({ EBUG_ON((_k)->format > KEY_FORMAT_CURRENT);                  \
 194          (_k)->format != KEY_FORMAT_CURRENT; })
 195 #else
 196 #define bkey_packed(_k)         ((_k)->format != KEY_FORMAT_CURRENT)
 197 #endif
 198
 199 /*
 200  * It's safe to treat an unpacked bkey as a packed one, but not the reverse
 201  */
 202 static inline struct bkey_packed *bkey_to_packed(struct bkey_i *k)
 203 {
 204         return (struct bkey_packed *) k;
 205 }
 206
 207 static inline const struct bkey_packed *bkey_to_packed_c(const struct bkey_i *k)
 208 {
 209         return (const struct bkey_packed *) k;
 210 }
 211
 212 static inline struct bkey_i *packed_to_bkey(struct bkey_packed *k)
 213 {
 214         return bkey_packed(k) ? NULL : (struct bkey_i *) k;
 215 }
 216
 217 static inline const struct bkey *packed_to_bkey_c(const struct bkey_packed *k)
 218 {
 219         return bkey_packed(k) ? NULL : (const struct bkey *) k;
 220 }
 221
 222 static inline unsigned bkey_format_key_bits(const struct bkey_format *format)
 223 {
 224         return format->bits_per_field[BKEY_FIELD_INODE] +
 225                 format->bits_per_field[BKEY_FIELD_OFFSET] +
 226                 format->bits_per_field[BKEY_FIELD_SNAPSHOT];
 227 }
 228
 229 static inline struct bpos bpos_successor(struct bpos p)
 230 {
 231         if (!++p.snapshot &&
 232             !++p.offset &&
 233             !++p.inode)
 234                 BUG();
 235
 236         return p;
 237 }
 238
 239 static inline struct bpos bpos_predecessor(struct bpos p)
 240 {
 241         if (!p.snapshot-- &&
 242             !p.offset-- &&
 243             !p.inode--)
 244                 BUG();
 245
 246         return p;
 247 }
 248
 249 static inline struct bpos bpos_nosnap_successor(struct bpos p)
 250 {
 251         p.snapshot = 0;
 252
 253         if (!++p.offset &&
 254             !++p.inode)
 255                 BUG();
 256
 257         return p;
 258 }
 259
 260 static inline struct bpos bpos_nosnap_predecessor(struct bpos p)
 261 {
 262         p.snapshot = 0;
 263
 264         if (!p.offset-- &&
 265             !p.inode--)
 266                 BUG();
 267
 268         return p;
 269 }
 270
 271 static inline u64 bkey_start_offset(const struct bkey *k)
 272 {
 273         return k->p.offset - k->size;
 274 }
 275
 276 static inline struct bpos bkey_start_pos(const struct bkey *k)
 277 {
 278         return (struct bpos) {
 279                 .inode          = k->p.inode,
 280                 .offset         = bkey_start_offset(k),
 281                 .snapshot       = k->p.snapshot,
 282         };
 283 }
 284
 285 /* Packed helpers */
 286
 287 static inline unsigned bkeyp_key_u64s(const struct bkey_format *format,
 288                                       const struct bkey_packed *k)
 289 {
 290         unsigned ret = bkey_packed(k) ? format->key_u64s : BKEY_U64s;
 291
 292         EBUG_ON(k->u64s < ret);
 293         return ret;
 294 }
 295
 296 static inline unsigned bkeyp_key_bytes(const struct bkey_format *format,
 297                                        const struct bkey_packed *k)
 298 {
 299         return bkeyp_key_u64s(format, k) * sizeof(u64);
 300 }
 301
 302 static inline unsigned bkeyp_val_u64s(const struct bkey_format *format,
 303                                       const struct bkey_packed *k)
 304 {
 305         return k->u64s - bkeyp_key_u64s(format, k);
 306 }
 307
 308 static inline size_t bkeyp_val_bytes(const struct bkey_format *format,
 309                                      const struct bkey_packed *k)
 310 {
 311         return bkeyp_val_u64s(format, k) * sizeof(u64);
 312 }
 313
 314 static inline void set_bkeyp_val_u64s(const struct bkey_format *format,
 315                                       struct bkey_packed *k, unsigned val_u64s)
 316 {
 317         k->u64s = bkeyp_key_u64s(format, k) + val_u64s;
 318 }
 319
 320 #define bkeyp_val(_format, _k)                                          \
 321          ((struct bch_val *) ((_k)->_data + bkeyp_key_u64s(_format, _k)))
 322
 323 extern const struct bkey_format bch2_bkey_format_current;
 324
 325 bool bch2_bkey_transform(const struct bkey_format *,
 326                          struct bkey_packed *,
 327                          const struct bkey_format *,
 328                          const struct bkey_packed *);
 329
 330 struct bkey __bch2_bkey_unpack_key(const struct bkey_format *,
 331                                    const struct bkey_packed *);
 332
 333 #ifndef HAVE_BCACHEFS_COMPILED_UNPACK
 334 struct bpos __bkey_unpack_pos(const struct bkey_format *,
 335                               const struct bkey_packed *);
 336 #endif
 337
 338 bool bch2_bkey_pack_key(struct bkey_packed *, const struct bkey *,
 339                    const struct bkey_format *);
 340
 341 enum bkey_pack_pos_ret {
 342         BKEY_PACK_POS_EXACT,
 343         BKEY_PACK_POS_SMALLER,
 344         BKEY_PACK_POS_FAIL,
 345 };
 346
 347 enum bkey_pack_pos_ret bch2_bkey_pack_pos_lossy(struct bkey_packed *, struct bpos,
 348                                            const struct btree *);
 349
 350 static inline bool bkey_pack_pos(struct bkey_packed *out, struct bpos in,
 351                                  const struct btree *b)
 352 {
 353         return bch2_bkey_pack_pos_lossy(out, in, b) == BKEY_PACK_POS_EXACT;
 354 }
 355
 356 void bch2_bkey_unpack(const struct btree *, struct bkey_i *,
 357                  const struct bkey_packed *);
 358 bool bch2_bkey_pack(struct bkey_packed *, const struct bkey_i *,
 359                const struct bkey_format *);
 360
 361 typedef void (*compiled_unpack_fn)(struct bkey *, const struct bkey_packed *);
 362
 363 static inline void
 364 __bkey_unpack_key_format_checked(const struct btree *b,
 365                                struct bkey *dst,
 366                                const struct bkey_packed *src)
 367 {
 368         if (IS_ENABLED(HAVE_BCACHEFS_COMPILED_UNPACK)) {
 369                 compiled_unpack_fn unpack_fn = b->aux_data;
 370                 unpack_fn(dst, src);
 371
 372                 if (IS_ENABLED(CONFIG_BCACHEFS_DEBUG) &&
 373                     bch2_expensive_debug_checks) {
 374                         struct bkey dst2 = __bch2_bkey_unpack_key(&b->format, src);
 375
 376                         BUG_ON(memcmp(dst, &dst2, sizeof(*dst)));
 377                 }
 378         } else {
 379                 *dst = __bch2_bkey_unpack_key(&b->format, src);
 380         }
 381 }
 382
 383 static inline struct bkey
 384 bkey_unpack_key_format_checked(const struct btree *b,
 385                                const struct bkey_packed *src)
 386 {
 387         struct bkey dst;
 388
 389         __bkey_unpack_key_format_checked(b, &dst, src);
 390         return dst;
 391 }
 392
 393 static inline void __bkey_unpack_key(const struct btree *b,
 394                                      struct bkey *dst,
 395                                      const struct bkey_packed *src)
 396 {
 397         if (likely(bkey_packed(src)))
 398                 __bkey_unpack_key_format_checked(b, dst, src);
 399         else
 400                 *dst = *packed_to_bkey_c(src);
 401 }
 402
 403 /**
 404  * bkey_unpack_key -- unpack just the key, not the value
 405  */
 406 static inline struct bkey bkey_unpack_key(const struct btree *b,
 407                                           const struct bkey_packed *src)
 408 {
 409         return likely(bkey_packed(src))
 410                 ? bkey_unpack_key_format_checked(b, src)
 411                 : *packed_to_bkey_c(src);
 412 }
 413
 414 static inline struct bpos
 415 bkey_unpack_pos_format_checked(const struct btree *b,
 416                                const struct bkey_packed *src)
 417 {
 418 #ifdef HAVE_BCACHEFS_COMPILED_UNPACK
 419         return bkey_unpack_key_format_checked(b, src).p;
 420 #else
 421         return __bkey_unpack_pos(&b->format, src);
 422 #endif
 423 }
 424
 425 static inline struct bpos bkey_unpack_pos(const struct btree *b,
 426                                           const struct bkey_packed *src)
 427 {
 428         return likely(bkey_packed(src))
 429                 ? bkey_unpack_pos_format_checked(b, src)
 430                 : packed_to_bkey_c(src)->p;
 431 }
 432
 433 /* Disassembled bkeys */
 434
 435 static inline struct bkey_s_c bkey_disassemble(struct btree *b,
 436                                                const struct bkey_packed *k,
 437                                                struct bkey *u)
 438 {
 439         __bkey_unpack_key(b, u, k);
 440
 441         return (struct bkey_s_c) { u, bkeyp_val(&b->format, k), };
 442 }
 443
 444 /* non const version: */
 445 static inline struct bkey_s __bkey_disassemble(struct btree *b,
 446                                                struct bkey_packed *k,
 447                                                struct bkey *u)
 448 {
 449         __bkey_unpack_key(b, u, k);
 450
 451         return (struct bkey_s) { .k = u, .v = bkeyp_val(&b->format, k), };
 452 }
 453
 454 static inline u64 bkey_field_max(const struct bkey_format *f,
 455                                  enum bch_bkey_fields nr)
 456 {
 457         return f->bits_per_field[nr] < 64
 458                 ? (le64_to_cpu(f->field_offset[nr]) +
 459                    ~(~0ULL << f->bits_per_field[nr]))
 460                 : U64_MAX;
 461 }
 462
 463 #ifdef HAVE_BCACHEFS_COMPILED_UNPACK
 464
 465 int bch2_compile_bkey_format(const struct bkey_format *, void *);
 466
 467 #else
 468
 469 static inline int bch2_compile_bkey_format(const struct bkey_format *format,
 470                                           void *out) { return 0; }
 471
 472 #endif
 473
 474 static inline void bkey_reassemble(struct bkey_i *dst,
 475                                    struct bkey_s_c src)
 476 {
 477         dst->k = *src.k;
 478         memcpy_u64s_small(&dst->v, src.v, bkey_val_u64s(src.k));
 479 }
 480
 481 #define bkey_s_null             ((struct bkey_s)   { .k = NULL })
 482 #define bkey_s_c_null           ((struct bkey_s_c) { .k = NULL })
 483
 484 #define bkey_s_err(err)         ((struct bkey_s)   { .k = ERR_PTR(err) })
 485 #define bkey_s_c_err(err)       ((struct bkey_s_c) { .k = ERR_PTR(err) })
 486
 487 static inline struct bkey_s bkey_to_s(struct bkey *k)
 488 {
 489         return (struct bkey_s) { .k = k, .v = NULL };
 490 }
 491
 492 static inline struct bkey_s_c bkey_to_s_c(const struct bkey *k)
 493 {
 494         return (struct bkey_s_c) { .k = k, .v = NULL };
 495 }
 496
 497 static inline struct bkey_s bkey_i_to_s(struct bkey_i *k)
 498 {
 499         return (struct bkey_s) { .k = &k->k, .v = &k->v };
 500 }
 501
 502 static inline struct bkey_s_c bkey_i_to_s_c(const struct bkey_i *k)
 503 {
 504         return (struct bkey_s_c) { .k = &k->k, .v = &k->v };
 505 }
 506
 507 /*
 508  * For a given type of value (e.g. struct bch_extent), generates the types for
 509  * bkey + bch_extent - inline, split, split const - and also all the conversion
 510  * functions, which also check that the value is of the correct type.
 511  *
 512  * We use anonymous unions for upcasting - e.g. converting from e.g. a
 513  * bkey_i_extent to a bkey_i - since that's always safe, instead of conversion
 514  * functions.
 515  */
 516 #define x(name, ...)                                    \
 517 struct bkey_i_##name {                                                  \
 518         union {                                                         \
 519                 struct bkey             k;                              \
 520                 struct bkey_i           k_i;                            \
 521         };                                                              \
 522         struct bch_##name               v;                              \
 523 };                                                                      \
 524                                                                         \
 525 struct bkey_s_c_##name {                                                \
 526         union {                                                         \
 527         struct {                                                        \
 528                 const struct bkey       *k;                             \
 529                 const struct bch_##name *v;                             \
 530         };                                                              \
 531         struct bkey_s_c                 s_c;                            \
 532         };                                                              \
 533 };                                                                      \
 534                                                                         \
 535 struct bkey_s_##name {                                                  \
 536         union {                                                         \
 537         struct {                                                        \
 538                 struct bkey             *k;                             \
 539                 struct bch_##name       *v;                             \
 540         };                                                              \
 541         struct bkey_s_c_##name          c;                              \
 542         struct bkey_s                   s;                              \
 543         struct bkey_s_c                 s_c;                            \
 544         };                                                              \
 545 };                                                                      \
 546                                                                         \
 547 static inline struct bkey_i_##name *bkey_i_to_##name(struct bkey_i *k)  \
 548 {                                                                       \
 549         EBUG_ON(k->k.type != KEY_TYPE_##name);                          \
 550         return container_of(&k->k, struct bkey_i_##name, k);            \
 551 }                                                                       \
 552                                                                         \
 553 static inline const struct bkey_i_##name *                              \
 554 bkey_i_to_##name##_c(const struct bkey_i *k)                            \
 555 {                                                                       \
 556         EBUG_ON(k->k.type != KEY_TYPE_##name);                          \
 557         return container_of(&k->k, struct bkey_i_##name, k);            \
 558 }                                                                       \
 559                                                                         \
 560 static inline struct bkey_s_##name bkey_s_to_##name(struct bkey_s k)    \
 561 {                                                                       \
 562         EBUG_ON(k.k->type != KEY_TYPE_##name);                          \
 563         return (struct bkey_s_##name) {                                 \
 564                 .k = k.k,                                               \
 565                 .v = container_of(k.v, struct bch_##name, v),           \
 566         };                                                              \
 567 }                                                                       \
 568                                                                         \
 569 static inline struct bkey_s_c_##name bkey_s_c_to_##name(struct bkey_s_c k)\
 570 {                                                                       \
 571         EBUG_ON(k.k->type != KEY_TYPE_##name);                          \
 572         return (struct bkey_s_c_##name) {                               \
 573                 .k = k.k,                                               \
 574                 .v = container_of(k.v, struct bch_##name, v),           \
 575         };                                                              \
 576 }                                                                       \
 577                                                                         \
 578 static inline struct bkey_s_##name name##_i_to_s(struct bkey_i_##name *k)\
 579 {                                                                       \
 580         return (struct bkey_s_##name) {                                 \
 581                 .k = &k->k,                                             \
 582                 .v = &k->v,                                             \
 583         };                                                              \
 584 }                                                                       \
 585                                                                         \
 586 static inline struct bkey_s_c_##name                                    \
 587 name##_i_to_s_c(const struct bkey_i_##name *k)                          \
 588 {                                                                       \
 589         return (struct bkey_s_c_##name) {                               \
 590                 .k = &k->k,                                             \
 591                 .v = &k->v,                                             \
 592         };                                                              \
 593 }                                                                       \
 594                                                                         \
 595 static inline struct bkey_s_##name bkey_i_to_s_##name(struct bkey_i *k) \
 596 {                                                                       \
 597         EBUG_ON(k->k.type != KEY_TYPE_##name);                          \
 598         return (struct bkey_s_##name) {                                 \
 599                 .k = &k->k,                                             \
 600                 .v = container_of(&k->v, struct bch_##name, v),         \
 601         };                                                              \
 602 }                                                                       \
 603                                                                         \
 604 static inline struct bkey_s_c_##name                                    \
 605 bkey_i_to_s_c_##name(const struct bkey_i *k)                            \
 606 {                                                                       \
 607         EBUG_ON(k->k.type != KEY_TYPE_##name);                          \
 608         return (struct bkey_s_c_##name) {                               \
 609                 .k = &k->k,                                             \
 610                 .v = container_of(&k->v, struct bch_##name, v),         \
 611         };                                                              \
 612 }                                                                       \
 613                                                                         \
 614 static inline struct bkey_i_##name *bkey_##name##_init(struct bkey_i *_k)\
 615 {                                                                       \
 616         struct bkey_i_##name *k =                                       \
 617                 container_of(&_k->k, struct bkey_i_##name, k);          \
 618                                                                         \
 619         bkey_init(&k->k);                                               \
 620         memset(&k->v, 0, sizeof(k->v));                                 \
 621         k->k.type = KEY_TYPE_##name;                                    \
 622         set_bkey_val_bytes(&k->k, sizeof(k->v));                        \
 623                                                                         \
 624         return k;                                                       \
 625 }
 626
 627 BCH_BKEY_TYPES();
 628 #undef x
 629
 630 /* byte order helpers */
 631
 632 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 633
 634 static inline unsigned high_word_offset(const struct bkey_format *f)
 635 {
 636         return f->key_u64s - 1;
 637 }
 638
 639 #define high_bit_offset         0
 640 #define nth_word(p, n)          ((p) - (n))
 641
 642 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 643
 644 static inline unsigned high_word_offset(const struct bkey_format *f)
 645 {
 646         return 0;
 647 }
 648
 649 #define high_bit_offset         KEY_PACKED_BITS_START
 650 #define nth_word(p, n)          ((p) + (n))
 651
 652 #else
 653 #error edit for your odd byteorder.
 654 #endif
 655
 656 #define high_word(f, k)         ((k)->_data + high_word_offset(f))
 657 #define next_word(p)            nth_word(p, 1)
 658 #define prev_word(p)            nth_word(p, -1)
 659
 660 #ifdef CONFIG_BCACHEFS_DEBUG
 661 void bch2_bkey_pack_test(void);
 662 #else
 663 static inline void bch2_bkey_pack_test(void) {}
 664 #endif
 665
 666 #endif /* _BCACHEFS_BKEY_H */