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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_EXTENTS_H
   3 #define _BCACHEFS_EXTENTS_H
   4
   5 #include "bcachefs.h"
   6 #include "bkey.h"
   7 #include "extents_types.h"
   8
   9 struct bch_fs;
  10 struct btree_trans;
  11
  12 /* extent entries: */
  13
  14 #define extent_entry_last(_e)                                           \
  15         ((typeof(&(_e).v->start[0])) bkey_val_end(_e))
  16
  17 #define entry_to_ptr(_entry)                                            \
  18 ({                                                                      \
  19         EBUG_ON((_entry) && !extent_entry_is_ptr(_entry));              \
  20                                                                         \
  21         __builtin_choose_expr(                                          \
  22                 type_is_exact(_entry, const union bch_extent_entry *),  \
  23                 (const struct bch_extent_ptr *) (_entry),               \
  24                 (struct bch_extent_ptr *) (_entry));                    \
  25 })
  26
  27 /* downcast, preserves const */
  28 #define to_entry(_entry)                                                \
  29 ({                                                                      \
  30         BUILD_BUG_ON(!type_is(_entry, union bch_extent_crc *) &&        \
  31                      !type_is(_entry, struct bch_extent_ptr *) &&       \
  32                      !type_is(_entry, struct bch_extent_stripe_ptr *)); \
  33                                                                         \
  34         __builtin_choose_expr(                                          \
  35                 (type_is_exact(_entry, const union bch_extent_crc *) || \
  36                  type_is_exact(_entry, const struct bch_extent_ptr *) ||\
  37                  type_is_exact(_entry, const struct bch_extent_stripe_ptr *)),\
  38                 (const union bch_extent_entry *) (_entry),              \
  39                 (union bch_extent_entry *) (_entry));                   \
  40 })
  41
  42 #define extent_entry_next(_entry)                                       \
  43         ((typeof(_entry)) ((void *) (_entry) + extent_entry_bytes(_entry)))
  44
  45 static inline unsigned
  46 __extent_entry_type(const union bch_extent_entry *e)
  47 {
  48         return e->type ? __ffs(e->type) : BCH_EXTENT_ENTRY_MAX;
  49 }
  50
  51 static inline enum bch_extent_entry_type
  52 extent_entry_type(const union bch_extent_entry *e)
  53 {
  54         int ret = __ffs(e->type);
  55
  56         EBUG_ON(ret < 0 || ret >= BCH_EXTENT_ENTRY_MAX);
  57
  58         return ret;
  59 }
  60
  61 static inline size_t extent_entry_bytes(const union bch_extent_entry *entry)
  62 {
  63         switch (extent_entry_type(entry)) {
  64 #define x(f, n)                                         \
  65         case BCH_EXTENT_ENTRY_##f:                      \
  66                 return sizeof(struct bch_extent_##f);
  67         BCH_EXTENT_ENTRY_TYPES()
  68 #undef x
  69         default:
  70                 BUG();
  71         }
  72 }
  73
  74 static inline size_t extent_entry_u64s(const union bch_extent_entry *entry)
  75 {
  76         return extent_entry_bytes(entry) / sizeof(u64);
  77 }
  78
  79 static inline bool extent_entry_is_ptr(const union bch_extent_entry *e)
  80 {
  81         switch (extent_entry_type(e)) {
  82         case BCH_EXTENT_ENTRY_ptr:
  83                 return true;
  84         default:
  85                 return false;
  86         }
  87 }
  88
  89 static inline bool extent_entry_is_crc(const union bch_extent_entry *e)
  90 {
  91         switch (extent_entry_type(e)) {
  92         case BCH_EXTENT_ENTRY_crc32:
  93         case BCH_EXTENT_ENTRY_crc64:
  94         case BCH_EXTENT_ENTRY_crc128:
  95                 return true;
  96         default:
  97                 return false;
  98         }
  99 }
 100
 101 union bch_extent_crc {
 102         u8                              type;
 103         struct bch_extent_crc32         crc32;
 104         struct bch_extent_crc64         crc64;
 105         struct bch_extent_crc128        crc128;
 106 };
 107
 108 #define __entry_to_crc(_entry)                                          \
 109         __builtin_choose_expr(                                          \
 110                 type_is_exact(_entry, const union bch_extent_entry *),  \
 111                 (const union bch_extent_crc *) (_entry),                \
 112                 (union bch_extent_crc *) (_entry))
 113
 114 #define entry_to_crc(_entry)                                            \
 115 ({                                                                      \
 116         EBUG_ON((_entry) && !extent_entry_is_crc(_entry));              \
 117                                                                         \
 118         __entry_to_crc(_entry);                                         \
 119 })
 120
 121 static inline struct bch_extent_crc_unpacked
 122 bch2_extent_crc_unpack(const struct bkey *k, const union bch_extent_crc *crc)
 123 {
 124 #define common_fields(_crc)                                             \
 125                 .csum_type              = _crc.csum_type,               \
 126                 .compression_type       = _crc.compression_type,        \
 127                 .compressed_size        = _crc._compressed_size + 1,    \
 128                 .uncompressed_size      = _crc._uncompressed_size + 1,  \
 129                 .offset                 = _crc.offset,                  \
 130                 .live_size              = k->size
 131
 132         if (!crc)
 133                 return (struct bch_extent_crc_unpacked) {
 134                         .compressed_size        = k->size,
 135                         .uncompressed_size      = k->size,
 136                         .live_size              = k->size,
 137                 };
 138
 139         switch (extent_entry_type(to_entry(crc))) {
 140         case BCH_EXTENT_ENTRY_crc32: {
 141                 struct bch_extent_crc_unpacked ret = (struct bch_extent_crc_unpacked) {
 142                         common_fields(crc->crc32),
 143                 };
 144
 145                 *((__le32 *) &ret.csum.lo) = crc->crc32.csum;
 146
 147                 memcpy(&ret.csum.lo, &crc->crc32.csum,
 148                        sizeof(crc->crc32.csum));
 149
 150                 return ret;
 151         }
 152         case BCH_EXTENT_ENTRY_crc64: {
 153                 struct bch_extent_crc_unpacked ret = (struct bch_extent_crc_unpacked) {
 154                         common_fields(crc->crc64),
 155                         .nonce                  = crc->crc64.nonce,
 156                         .csum.lo                = (__force __le64) crc->crc64.csum_lo,
 157                 };
 158
 159                 *((__le16 *) &ret.csum.hi) = crc->crc64.csum_hi;
 160
 161                 return ret;
 162         }
 163         case BCH_EXTENT_ENTRY_crc128: {
 164                 struct bch_extent_crc_unpacked ret = (struct bch_extent_crc_unpacked) {
 165                         common_fields(crc->crc128),
 166                         .nonce                  = crc->crc128.nonce,
 167                         .csum                   = crc->crc128.csum,
 168                 };
 169
 170                 return ret;
 171         }
 172         default:
 173                 BUG();
 174         }
 175 #undef common_fields
 176 }
 177
 178 /* bkey_ptrs: generically over any key type that has ptrs */
 179
 180 struct bkey_ptrs_c {
 181         const union bch_extent_entry    *start;
 182         const union bch_extent_entry    *end;
 183 };
 184
 185 struct bkey_ptrs {
 186         union bch_extent_entry  *start;
 187         union bch_extent_entry  *end;
 188 };
 189
 190 static inline struct bkey_ptrs_c bch2_bkey_ptrs_c(struct bkey_s_c k)
 191 {
 192         switch (k.k->type) {
 193         case KEY_TYPE_btree_ptr: {
 194                 struct bkey_s_c_btree_ptr e = bkey_s_c_to_btree_ptr(k);
 195                 return (struct bkey_ptrs_c) {
 196                         to_entry(&e.v->start[0]),
 197                         to_entry(extent_entry_last(e))
 198                 };
 199         }
 200         case KEY_TYPE_extent: {
 201                 struct bkey_s_c_extent e = bkey_s_c_to_extent(k);
 202                 return (struct bkey_ptrs_c) {
 203                         e.v->start,
 204                         extent_entry_last(e)
 205                 };
 206         }
 207         case KEY_TYPE_stripe: {
 208                 struct bkey_s_c_stripe s = bkey_s_c_to_stripe(k);
 209                 return (struct bkey_ptrs_c) {
 210                         to_entry(&s.v->ptrs[0]),
 211                         to_entry(&s.v->ptrs[s.v->nr_blocks]),
 212                 };
 213         }
 214         case KEY_TYPE_reflink_v: {
 215                 struct bkey_s_c_reflink_v r = bkey_s_c_to_reflink_v(k);
 216
 217                 return (struct bkey_ptrs_c) {
 218                         r.v->start,
 219                         bkey_val_end(r),
 220                 };
 221         }
 222         default:
 223                 return (struct bkey_ptrs_c) { NULL, NULL };
 224         }
 225 }
 226
 227 static inline struct bkey_ptrs bch2_bkey_ptrs(struct bkey_s k)
 228 {
 229         struct bkey_ptrs_c p = bch2_bkey_ptrs_c(k.s_c);
 230
 231         return (struct bkey_ptrs) {
 232                 (void *) p.start,
 233                 (void *) p.end
 234         };
 235 }
 236
 237 #define __bkey_extent_entry_for_each_from(_start, _end, _entry)         \
 238         for ((_entry) = (_start);                                       \
 239              (_entry) < (_end);                                         \
 240              (_entry) = extent_entry_next(_entry))
 241
 242 #define __bkey_ptr_next(_ptr, _end)                                     \
 243 ({                                                                      \
 244         typeof(_end) _entry;                                            \
 245                                                                         \
 246         __bkey_extent_entry_for_each_from(to_entry(_ptr), _end, _entry) \
 247                 if (extent_entry_is_ptr(_entry))                        \
 248                         break;                                          \
 249                                                                         \
 250         _entry < (_end) ? entry_to_ptr(_entry) : NULL;                  \
 251 })
 252
 253 #define bkey_extent_entry_for_each_from(_p, _entry, _start)             \
 254         __bkey_extent_entry_for_each_from(_start, (_p).end, _entry)
 255
 256 #define bkey_extent_entry_for_each(_p, _entry)                          \
 257         bkey_extent_entry_for_each_from(_p, _entry, _p.start)
 258
 259 #define __bkey_for_each_ptr(_start, _end, _ptr)                         \
 260         for ((_ptr) = (_start);                                         \
 261              ((_ptr) = __bkey_ptr_next(_ptr, _end));                    \
 262              (_ptr)++)
 263
 264 #define bkey_ptr_next(_p, _ptr)                                         \
 265         __bkey_ptr_next(_ptr, (_p).end)
 266
 267 #define bkey_for_each_ptr(_p, _ptr)                                     \
 268         __bkey_for_each_ptr(&(_p).start->ptr, (_p).end, _ptr)
 269
 270 #define __bkey_ptr_next_decode(_k, _end, _ptr, _entry)                  \
 271 ({                                                                      \
 272         __label__ out;                                                  \
 273                                                                         \
 274         (_ptr).idx      = 0;                                            \
 275         (_ptr).has_ec   = false;                                        \
 276                                                                         \
 277         __bkey_extent_entry_for_each_from(_entry, _end, _entry)         \
 278                 switch (extent_entry_type(_entry)) {                    \
 279                 case BCH_EXTENT_ENTRY_ptr:                              \
 280                         (_ptr).ptr              = _entry->ptr;          \
 281                         goto out;                                       \
 282                 case BCH_EXTENT_ENTRY_crc32:                            \
 283                 case BCH_EXTENT_ENTRY_crc64:                            \
 284                 case BCH_EXTENT_ENTRY_crc128:                           \
 285                         (_ptr).crc = bch2_extent_crc_unpack(_k,         \
 286                                         entry_to_crc(_entry));          \
 287                         break;                                          \
 288                 case BCH_EXTENT_ENTRY_stripe_ptr:                       \
 289                         (_ptr).ec = _entry->stripe_ptr;                 \
 290                         (_ptr).has_ec   = true;                         \
 291                         break;                                          \
 292                 }                                                       \
 293 out:                                                                    \
 294         _entry < (_end);                                                \
 295 })
 296
 297 #define __bkey_for_each_ptr_decode(_k, _start, _end, _ptr, _entry)      \
 298         for ((_ptr).crc = bch2_extent_crc_unpack(_k, NULL),             \
 299              (_entry) = _start;                                         \
 300              __bkey_ptr_next_decode(_k, _end, _ptr, _entry);            \
 301              (_entry) = extent_entry_next(_entry))
 302
 303 #define bkey_for_each_ptr_decode(_k, _p, _ptr, _entry)                  \
 304         __bkey_for_each_ptr_decode(_k, (_p).start, (_p).end,            \
 305                                    _ptr, _entry)
 306
 307 #define bkey_crc_next(_k, _start, _end, _crc, _iter)                    \
 308 ({                                                                      \
 309         __bkey_extent_entry_for_each_from(_iter, _end, _iter)           \
 310                 if (extent_entry_is_crc(_iter)) {                       \
 311                         (_crc) = bch2_extent_crc_unpack(_k,             \
 312                                                 entry_to_crc(_iter));   \
 313                         break;                                          \
 314                 }                                                       \
 315                                                                         \
 316         (_iter) < (_end);                                               \
 317 })
 318
 319 #define __bkey_for_each_crc(_k, _start, _end, _crc, _iter)              \
 320         for ((_crc) = bch2_extent_crc_unpack(_k, NULL),                 \
 321              (_iter) = (_start);                                        \
 322              bkey_crc_next(_k, _start, _end, _crc, _iter);              \
 323              (_iter) = extent_entry_next(_iter))
 324
 325 #define bkey_for_each_crc(_k, _p, _crc, _iter)                          \
 326         __bkey_for_each_crc(_k, (_p).start, (_p).end, _crc, _iter)
 327
 328 /* Iterate over pointers in KEY_TYPE_extent: */
 329
 330 #define extent_for_each_entry_from(_e, _entry, _start)                  \
 331         __bkey_extent_entry_for_each_from(_start,                       \
 332                                 extent_entry_last(_e),_entry)
 333
 334 #define extent_for_each_entry(_e, _entry)                               \
 335         extent_for_each_entry_from(_e, _entry, (_e).v->start)
 336
 337 #define extent_ptr_next(_e, _ptr)                                       \
 338         __bkey_ptr_next(_ptr, extent_entry_last(_e))
 339
 340 #define extent_for_each_ptr(_e, _ptr)                                   \
 341         __bkey_for_each_ptr(&(_e).v->start->ptr, extent_entry_last(_e), _ptr)
 342
 343 #define extent_for_each_ptr_decode(_e, _ptr, _entry)                    \
 344         __bkey_for_each_ptr_decode((_e).k, (_e).v->start,               \
 345                                    extent_entry_last(_e), _ptr, _entry)
 346
 347 /* utility code common to all keys with pointers: */
 348
 349 void bch2_mark_io_failure(struct bch_io_failures *,
 350                           struct extent_ptr_decoded *);
 351 int bch2_bkey_pick_read_device(struct bch_fs *, struct bkey_s_c,
 352                                struct bch_io_failures *,
 353                                struct extent_ptr_decoded *);
 354
 355 /* KEY_TYPE_btree_ptr: */
 356
 357 const char *bch2_btree_ptr_invalid(const struct bch_fs *, struct bkey_s_c);
 358 void bch2_btree_ptr_debugcheck(struct bch_fs *, struct bkey_s_c);
 359 void bch2_btree_ptr_to_text(struct printbuf *, struct bch_fs *,
 360                             struct bkey_s_c);
 361
 362 #define bch2_bkey_ops_btree_ptr (struct bkey_ops) {             \
 363         .key_invalid    = bch2_btree_ptr_invalid,               \
 364         .key_debugcheck = bch2_btree_ptr_debugcheck,            \
 365         .val_to_text    = bch2_btree_ptr_to_text,               \
 366         .swab           = bch2_ptr_swab,                        \
 367 }
 368
 369 /* KEY_TYPE_extent: */
 370
 371 const char *bch2_extent_invalid(const struct bch_fs *, struct bkey_s_c);
 372 void bch2_extent_debugcheck(struct bch_fs *, struct bkey_s_c);
 373 void bch2_extent_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
 374 enum merge_result bch2_extent_merge(struct bch_fs *,
 375                                     struct bkey_s, struct bkey_s);
 376
 377 #define bch2_bkey_ops_extent (struct bkey_ops) {                \
 378         .key_invalid    = bch2_extent_invalid,                  \
 379         .key_debugcheck = bch2_extent_debugcheck,               \
 380         .val_to_text    = bch2_extent_to_text,                  \
 381         .swab           = bch2_ptr_swab,                        \
 382         .key_normalize  = bch2_extent_normalize,                \
 383         .key_merge      = bch2_extent_merge,                    \
 384 }
 385
 386 /* KEY_TYPE_reservation: */
 387
 388 const char *bch2_reservation_invalid(const struct bch_fs *, struct bkey_s_c);
 389 void bch2_reservation_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
 390 enum merge_result bch2_reservation_merge(struct bch_fs *,
 391                                          struct bkey_s, struct bkey_s);
 392
 393 #define bch2_bkey_ops_reservation (struct bkey_ops) {           \
 394         .key_invalid    = bch2_reservation_invalid,             \
 395         .val_to_text    = bch2_reservation_to_text,             \
 396         .key_merge      = bch2_reservation_merge,               \
 397 }
 398
 399 /* Extent checksum entries: */
 400
 401 bool bch2_can_narrow_extent_crcs(struct bkey_s_c,
 402                                  struct bch_extent_crc_unpacked);
 403 bool bch2_bkey_narrow_crcs(struct bkey_i *, struct bch_extent_crc_unpacked);
 404 void bch2_extent_crc_append(struct bkey_i *,
 405                             struct bch_extent_crc_unpacked);
 406
 407 /* Generic code for keys with pointers: */
 408
 409 static inline bool bkey_extent_is_direct_data(const struct bkey *k)
 410 {
 411         switch (k->type) {
 412         case KEY_TYPE_btree_ptr:
 413         case KEY_TYPE_extent:
 414         case KEY_TYPE_reflink_v:
 415                 return true;
 416         default:
 417                 return false;
 418         }
 419 }
 420
 421 static inline bool bkey_extent_is_data(const struct bkey *k)
 422 {
 423         return bkey_extent_is_direct_data(k) ||
 424                 k->type == KEY_TYPE_inline_data ||
 425                 k->type == KEY_TYPE_reflink_p;
 426 }
 427
 428 /*
 429  * Should extent be counted under inode->i_sectors?
 430  */
 431 static inline bool bkey_extent_is_allocation(const struct bkey *k)
 432 {
 433         switch (k->type) {
 434         case KEY_TYPE_extent:
 435         case KEY_TYPE_reservation:
 436         case KEY_TYPE_reflink_p:
 437         case KEY_TYPE_reflink_v:
 438         case KEY_TYPE_inline_data:
 439                 return true;
 440         default:
 441                 return false;
 442         }
 443 }
 444
 445 static inline struct bch_devs_list bch2_bkey_devs(struct bkey_s_c k)
 446 {
 447         struct bch_devs_list ret = (struct bch_devs_list) { 0 };
 448         struct bkey_ptrs_c p = bch2_bkey_ptrs_c(k);
 449         const struct bch_extent_ptr *ptr;
 450
 451         bkey_for_each_ptr(p, ptr)
 452                 ret.devs[ret.nr++] = ptr->dev;
 453
 454         return ret;
 455 }
 456
 457 static inline struct bch_devs_list bch2_bkey_dirty_devs(struct bkey_s_c k)
 458 {
 459         struct bch_devs_list ret = (struct bch_devs_list) { 0 };
 460         struct bkey_ptrs_c p = bch2_bkey_ptrs_c(k);
 461         const struct bch_extent_ptr *ptr;
 462
 463         bkey_for_each_ptr(p, ptr)
 464                 if (!ptr->cached)
 465                         ret.devs[ret.nr++] = ptr->dev;
 466
 467         return ret;
 468 }
 469
 470 static inline struct bch_devs_list bch2_bkey_cached_devs(struct bkey_s_c k)
 471 {
 472         struct bch_devs_list ret = (struct bch_devs_list) { 0 };
 473         struct bkey_ptrs_c p = bch2_bkey_ptrs_c(k);
 474         const struct bch_extent_ptr *ptr;
 475
 476         bkey_for_each_ptr(p, ptr)
 477                 if (ptr->cached)
 478                         ret.devs[ret.nr++] = ptr->dev;
 479
 480         return ret;
 481 }
 482
 483 unsigned bch2_bkey_nr_ptrs(struct bkey_s_c);
 484 unsigned bch2_bkey_nr_ptrs_allocated(struct bkey_s_c);
 485 unsigned bch2_bkey_nr_ptrs_fully_allocated(struct bkey_s_c);
 486 unsigned bch2_bkey_sectors_compressed(struct bkey_s_c);
 487 bool bch2_check_range_allocated(struct bch_fs *, struct bpos, u64, unsigned);
 488 unsigned bch2_bkey_durability(struct bch_fs *, struct bkey_s_c);
 489
 490 void bch2_bkey_mark_replicas_cached(struct bch_fs *, struct bkey_s,
 491                                     unsigned, unsigned);
 492
 493 void bch2_bkey_append_ptr(struct bkey_i *, struct bch_extent_ptr);
 494 void bch2_extent_ptr_decoded_append(struct bkey_i *,
 495                                     struct extent_ptr_decoded *);
 496 union bch_extent_entry *bch2_bkey_drop_ptr(struct bkey_s,
 497                                            struct bch_extent_ptr *);
 498
 499 #define bch2_bkey_drop_ptrs(_k, _ptr, _cond)                            \
 500 do {                                                                    \
 501         struct bkey_ptrs _ptrs = bch2_bkey_ptrs(_k);                    \
 502                                                                         \
 503         _ptr = &_ptrs.start->ptr;                                       \
 504                                                                         \
 505         while ((_ptr = bkey_ptr_next(_ptrs, _ptr))) {                   \
 506                 if (_cond) {                                            \
 507                         _ptr = (void *) bch2_bkey_drop_ptr(_k, _ptr);   \
 508                         _ptrs = bch2_bkey_ptrs(_k);                     \
 509                         continue;                                       \
 510                 }                                                       \
 511                                                                         \
 512                 (_ptr)++;                                               \
 513         }                                                               \
 514 } while (0)
 515
 516 void bch2_bkey_drop_device(struct bkey_s, unsigned);
 517 const struct bch_extent_ptr *bch2_bkey_has_device(struct bkey_s_c, unsigned);
 518 bool bch2_bkey_has_target(struct bch_fs *, struct bkey_s_c, unsigned);
 519
 520 bool bch2_bkey_matches_ptr(struct bch_fs *, struct bkey_s_c,
 521                            struct bch_extent_ptr, u64);
 522
 523 bool bch2_extent_normalize(struct bch_fs *, struct bkey_s);
 524 void bch2_bkey_ptrs_to_text(struct printbuf *, struct bch_fs *,
 525                             struct bkey_s_c);
 526 const char *bch2_bkey_ptrs_invalid(const struct bch_fs *, struct bkey_s_c);
 527
 528 void bch2_ptr_swab(const struct bkey_format *, struct bkey_packed *);
 529
 530 /* Generic extent code: */
 531
 532 int bch2_cut_front_s(struct bpos, struct bkey_s);
 533 int bch2_cut_back_s(struct bpos, struct bkey_s);
 534
 535 static inline void bch2_cut_front(struct bpos where, struct bkey_i *k)
 536 {
 537         bch2_cut_front_s(where, bkey_i_to_s(k));
 538 }
 539
 540 static inline void bch2_cut_back(struct bpos where, struct bkey_i *k)
 541 {
 542         bch2_cut_back_s(where, bkey_i_to_s(k));
 543 }
 544
 545 /**
 546  * bch_key_resize - adjust size of @k
 547  *
 548  * bkey_start_offset(k) will be preserved, modifies where the extent ends
 549  */
 550 static inline void bch2_key_resize(struct bkey *k, unsigned new_size)
 551 {
 552         k->p.offset -= k->size;
 553         k->p.offset += new_size;
 554         k->size = new_size;
 555 }
 556
 557 /*
 558  * In extent_sort_fix_overlapping(), insert_fixup_extent(),
 559  * extent_merge_inline() - we're modifying keys in place that are packed. To do
 560  * that we have to unpack the key, modify the unpacked key - then this
 561  * copies/repacks the unpacked to the original as necessary.
 562  */
 563 static inline void extent_save(struct btree *b, struct bkey_packed *dst,
 564                                struct bkey *src)
 565 {
 566         struct bkey_format *f = &b->format;
 567         struct bkey_i *dst_unpacked;
 568
 569         if ((dst_unpacked = packed_to_bkey(dst)))
 570                 dst_unpacked->k = *src;
 571         else
 572                 BUG_ON(!bch2_bkey_pack_key(dst, src, f));
 573 }
 574
 575 #endif /* _BCACHEFS_EXTENTS_H */