1 // SPDX-License-Identifier: GPL-2.0
5 #include "bkey_methods.h"
12 #define EBUG_ON(cond) BUG_ON(cond)
17 const struct bkey_format bch2_bkey_format_current = BKEY_FORMAT_CURRENT;
19 struct bkey __bch2_bkey_unpack_key(const struct bkey_format *,
20 const struct bkey_packed *);
22 void bch2_to_binary(char *out, const u64 *p, unsigned nr_bits)
24 unsigned bit = high_bit_offset, done = 0;
28 if (done && !(done % 8))
30 *out++ = *p & (1ULL << (63 - bit)) ? '1' : '0';
33 if (done == nr_bits) {
44 #ifdef CONFIG_BCACHEFS_DEBUG
46 static void bch2_bkey_pack_verify(const struct bkey_packed *packed,
47 const struct bkey *unpacked,
48 const struct bkey_format *format)
52 BUG_ON(bkeyp_val_u64s(format, packed) !=
53 bkey_val_u64s(unpacked));
55 BUG_ON(packed->u64s < bkeyp_key_u64s(format, packed));
57 tmp = __bch2_bkey_unpack_key(format, packed);
59 if (memcmp(&tmp, unpacked, sizeof(struct bkey))) {
60 struct printbuf buf1 = PRINTBUF;
61 struct printbuf buf2 = PRINTBUF;
62 char buf3[160], buf4[160];
64 bch2_bkey_to_text(&buf1, unpacked);
65 bch2_bkey_to_text(&buf2, &tmp);
66 bch2_to_binary(buf3, (void *) unpacked, 80);
67 bch2_to_binary(buf4, high_word(format, packed), 80);
69 panic("keys differ: format u64s %u fields %u %u %u %u %u\n%s\n%s\n%s\n%s\n",
71 format->bits_per_field[0],
72 format->bits_per_field[1],
73 format->bits_per_field[2],
74 format->bits_per_field[3],
75 format->bits_per_field[4],
76 buf1.buf, buf2.buf, buf3, buf4);
81 static inline void bch2_bkey_pack_verify(const struct bkey_packed *packed,
82 const struct bkey *unpacked,
83 const struct bkey_format *format) {}
87 const struct bkey_format *format;
88 unsigned bits; /* bits remaining in current word */
89 u64 w; /* current word */
90 u64 *p; /* pointer to next word */
94 static struct pack_state pack_state_init(const struct bkey_format *format,
95 struct bkey_packed *k)
97 u64 *p = high_word(format, k);
99 return (struct pack_state) {
101 .bits = 64 - high_bit_offset,
108 static void pack_state_finish(struct pack_state *state,
109 struct bkey_packed *k)
111 EBUG_ON(state->p < k->_data);
112 EBUG_ON(state->p >= k->_data + state->format->key_u64s);
114 *state->p = state->w;
117 struct unpack_state {
118 const struct bkey_format *format;
119 unsigned bits; /* bits remaining in current word */
120 u64 w; /* current word */
121 const u64 *p; /* pointer to next word */
125 static struct unpack_state unpack_state_init(const struct bkey_format *format,
126 const struct bkey_packed *k)
128 const u64 *p = high_word(format, k);
130 return (struct unpack_state) {
132 .bits = 64 - high_bit_offset,
133 .w = *p << high_bit_offset,
139 static u64 get_inc_field(struct unpack_state *state, unsigned field)
141 unsigned bits = state->format->bits_per_field[field];
142 u64 v = 0, offset = le64_to_cpu(state->format->field_offset[field]);
144 if (bits >= state->bits) {
145 v = state->w >> (64 - bits);
148 state->p = next_word(state->p);
149 state->w = *state->p;
153 /* avoid shift by 64 if bits is 0 - bits is never 64 here: */
154 v |= (state->w >> 1) >> (63 - bits);
162 static bool set_inc_field(struct pack_state *state, unsigned field, u64 v)
164 unsigned bits = state->format->bits_per_field[field];
165 u64 offset = le64_to_cpu(state->format->field_offset[field]);
175 if (bits > state->bits) {
177 /* avoid shift by 64 if bits is 0 - bits is never 64 here: */
178 state->w |= (v >> 1) >> (bits - 1);
180 *state->p = state->w;
181 state->p = next_word(state->p);
187 state->w |= v << state->bits;
193 * Note: does NOT set out->format (we don't know what it should be here!)
195 * Also: doesn't work on extents - it doesn't preserve the invariant that
196 * if k is packed bkey_start_pos(k) will successfully pack
198 static bool bch2_bkey_transform_key(const struct bkey_format *out_f,
199 struct bkey_packed *out,
200 const struct bkey_format *in_f,
201 const struct bkey_packed *in)
203 struct pack_state out_s = pack_state_init(out_f, out);
204 struct unpack_state in_s = unpack_state_init(in_f, in);
210 for (i = 0; i < BKEY_NR_FIELDS; i++)
211 if (!set_inc_field(&out_s, i, get_inc_field(&in_s, i)))
214 /* Can't happen because the val would be too big to unpack: */
215 EBUG_ON(in->u64s - in_f->key_u64s + out_f->key_u64s > U8_MAX);
217 pack_state_finish(&out_s, out);
218 out->u64s = out_f->key_u64s + in->u64s - in_f->key_u64s;
219 out->needs_whiteout = in->needs_whiteout;
220 out->type = in->type;
225 bool bch2_bkey_transform(const struct bkey_format *out_f,
226 struct bkey_packed *out,
227 const struct bkey_format *in_f,
228 const struct bkey_packed *in)
230 if (!bch2_bkey_transform_key(out_f, out, in_f, in))
233 memcpy_u64s((u64 *) out + out_f->key_u64s,
234 (u64 *) in + in_f->key_u64s,
235 (in->u64s - in_f->key_u64s));
239 #define bkey_fields() \
240 x(BKEY_FIELD_INODE, p.inode) \
241 x(BKEY_FIELD_OFFSET, p.offset) \
242 x(BKEY_FIELD_SNAPSHOT, p.snapshot) \
243 x(BKEY_FIELD_SIZE, size) \
244 x(BKEY_FIELD_VERSION_HI, version.hi) \
245 x(BKEY_FIELD_VERSION_LO, version.lo)
247 struct bkey __bch2_bkey_unpack_key(const struct bkey_format *format,
248 const struct bkey_packed *in)
250 struct unpack_state state = unpack_state_init(format, in);
253 EBUG_ON(format->nr_fields != BKEY_NR_FIELDS);
254 EBUG_ON(in->u64s < format->key_u64s);
255 EBUG_ON(in->format != KEY_FORMAT_LOCAL_BTREE);
256 EBUG_ON(in->u64s - format->key_u64s + BKEY_U64s > U8_MAX);
258 out.u64s = BKEY_U64s + in->u64s - format->key_u64s;
259 out.format = KEY_FORMAT_CURRENT;
260 out.needs_whiteout = in->needs_whiteout;
264 #define x(id, field) out.field = get_inc_field(&state, id);
271 #ifndef HAVE_BCACHEFS_COMPILED_UNPACK
272 struct bpos __bkey_unpack_pos(const struct bkey_format *format,
273 const struct bkey_packed *in)
275 struct unpack_state state = unpack_state_init(format, in);
278 EBUG_ON(format->nr_fields != BKEY_NR_FIELDS);
279 EBUG_ON(in->u64s < format->key_u64s);
280 EBUG_ON(in->format != KEY_FORMAT_LOCAL_BTREE);
282 out.inode = get_inc_field(&state, BKEY_FIELD_INODE);
283 out.offset = get_inc_field(&state, BKEY_FIELD_OFFSET);
284 out.snapshot = get_inc_field(&state, BKEY_FIELD_SNAPSHOT);
291 * bch2_bkey_pack_key -- pack just the key, not the value
293 bool bch2_bkey_pack_key(struct bkey_packed *out, const struct bkey *in,
294 const struct bkey_format *format)
296 struct pack_state state = pack_state_init(format, out);
299 EBUG_ON((void *) in == (void *) out);
300 EBUG_ON(format->nr_fields != BKEY_NR_FIELDS);
301 EBUG_ON(in->format != KEY_FORMAT_CURRENT);
305 #define x(id, field) if (!set_inc_field(&state, id, in->field)) return false;
310 * Extents - we have to guarantee that if an extent is packed, a trimmed
311 * version will also pack:
313 if (bkey_start_offset(in) <
314 le64_to_cpu(format->field_offset[BKEY_FIELD_OFFSET]))
317 pack_state_finish(&state, out);
318 out->u64s = format->key_u64s + in->u64s - BKEY_U64s;
319 out->format = KEY_FORMAT_LOCAL_BTREE;
320 out->needs_whiteout = in->needs_whiteout;
321 out->type = in->type;
323 bch2_bkey_pack_verify(out, in, format);
328 * bch2_bkey_unpack -- unpack the key and the value
330 void bch2_bkey_unpack(const struct btree *b, struct bkey_i *dst,
331 const struct bkey_packed *src)
333 __bkey_unpack_key(b, &dst->k, src);
336 bkeyp_val(&b->format, src),
337 bkeyp_val_u64s(&b->format, src));
341 * bch2_bkey_pack -- pack the key and the value
343 bool bch2_bkey_pack(struct bkey_packed *out, const struct bkey_i *in,
344 const struct bkey_format *format)
346 struct bkey_packed tmp;
348 if (!bch2_bkey_pack_key(&tmp, &in->k, format))
351 memmove_u64s((u64 *) out + format->key_u64s,
353 bkey_val_u64s(&in->k));
354 memcpy_u64s(out, &tmp, format->key_u64s);
360 static bool set_inc_field_lossy(struct pack_state *state, unsigned field, u64 v)
362 unsigned bits = state->format->bits_per_field[field];
363 u64 offset = le64_to_cpu(state->format->field_offset[field]);
369 if (fls64(v) > bits) {
370 v = ~(~0ULL << bits);
374 if (bits > state->bits) {
376 state->w |= (v >> 1) >> (bits - 1);
378 *state->p = state->w;
379 state->p = next_word(state->p);
385 state->w |= v << state->bits;
390 #ifdef CONFIG_BCACHEFS_DEBUG
391 static bool bkey_packed_successor(struct bkey_packed *out,
392 const struct btree *b,
393 struct bkey_packed k)
395 const struct bkey_format *f = &b->format;
396 unsigned nr_key_bits = b->nr_key_bits;
397 unsigned first_bit, offset;
400 EBUG_ON(b->nr_key_bits != bkey_format_key_bits(f));
407 first_bit = high_bit_offset + nr_key_bits - 1;
408 p = nth_word(high_word(f, out), first_bit >> 6);
409 offset = 63 - (first_bit & 63);
411 while (nr_key_bits) {
412 unsigned bits = min(64 - offset, nr_key_bits);
413 u64 mask = (~0ULL >> (64 - bits)) << offset;
415 if ((*p & mask) != mask) {
416 *p += 1ULL << offset;
417 EBUG_ON(bch2_bkey_cmp_packed(b, out, &k) <= 0);
432 * Returns a packed key that compares <= in
434 * This is used in bset_search_tree(), where we need a packed pos in order to be
435 * able to compare against the keys in the auxiliary search tree - and it's
436 * legal to use a packed pos that isn't equivalent to the original pos,
437 * _provided_ it compares <= to the original pos.
439 enum bkey_pack_pos_ret bch2_bkey_pack_pos_lossy(struct bkey_packed *out,
441 const struct btree *b)
443 const struct bkey_format *f = &b->format;
444 struct pack_state state = pack_state_init(f, out);
446 #ifdef CONFIG_BCACHEFS_DEBUG
447 struct bpos orig = in;
453 * bch2_bkey_pack_key() will write to all of f->key_u64s, minus the 3
454 * byte header, but pack_pos() won't if the len/version fields are big
455 * enough - we need to make sure to zero them out:
457 for (i = 0; i < f->key_u64s; i++)
460 if (unlikely(in.snapshot <
461 le64_to_cpu(f->field_offset[BKEY_FIELD_SNAPSHOT]))) {
464 return BKEY_PACK_POS_FAIL;
465 in.snapshot = KEY_SNAPSHOT_MAX;
469 if (unlikely(in.offset <
470 le64_to_cpu(f->field_offset[BKEY_FIELD_OFFSET]))) {
472 return BKEY_PACK_POS_FAIL;
473 in.offset = KEY_OFFSET_MAX;
474 in.snapshot = KEY_SNAPSHOT_MAX;
478 if (unlikely(in.inode <
479 le64_to_cpu(f->field_offset[BKEY_FIELD_INODE])))
480 return BKEY_PACK_POS_FAIL;
482 if (!set_inc_field_lossy(&state, BKEY_FIELD_INODE, in.inode)) {
483 in.offset = KEY_OFFSET_MAX;
484 in.snapshot = KEY_SNAPSHOT_MAX;
488 if (!set_inc_field_lossy(&state, BKEY_FIELD_OFFSET, in.offset)) {
489 in.snapshot = KEY_SNAPSHOT_MAX;
493 if (!set_inc_field_lossy(&state, BKEY_FIELD_SNAPSHOT, in.snapshot))
496 pack_state_finish(&state, out);
497 out->u64s = f->key_u64s;
498 out->format = KEY_FORMAT_LOCAL_BTREE;
499 out->type = KEY_TYPE_deleted;
501 #ifdef CONFIG_BCACHEFS_DEBUG
503 BUG_ON(bkey_cmp_left_packed(b, out, &orig));
505 struct bkey_packed successor;
507 BUG_ON(bkey_cmp_left_packed(b, out, &orig) >= 0);
508 BUG_ON(bkey_packed_successor(&successor, b, *out) &&
509 bkey_cmp_left_packed(b, &successor, &orig) < 0);
513 return exact ? BKEY_PACK_POS_EXACT : BKEY_PACK_POS_SMALLER;
516 void bch2_bkey_format_init(struct bkey_format_state *s)
520 for (i = 0; i < ARRAY_SIZE(s->field_min); i++)
521 s->field_min[i] = U64_MAX;
523 for (i = 0; i < ARRAY_SIZE(s->field_max); i++)
526 /* Make sure we can store a size of 0: */
527 s->field_min[BKEY_FIELD_SIZE] = 0;
530 static void __bkey_format_add(struct bkey_format_state *s,
531 unsigned field, u64 v)
533 s->field_min[field] = min(s->field_min[field], v);
534 s->field_max[field] = max(s->field_max[field], v);
538 * Changes @format so that @k can be successfully packed with @format
540 void bch2_bkey_format_add_key(struct bkey_format_state *s, const struct bkey *k)
542 #define x(id, field) __bkey_format_add(s, id, k->field);
545 __bkey_format_add(s, BKEY_FIELD_OFFSET, bkey_start_offset(k));
548 void bch2_bkey_format_add_pos(struct bkey_format_state *s, struct bpos p)
552 __bkey_format_add(s, field++, p.inode);
553 __bkey_format_add(s, field++, p.offset);
554 __bkey_format_add(s, field++, p.snapshot);
558 * We don't want it to be possible for the packed format to represent fields
559 * bigger than a u64... that will cause confusion and issues (like with
560 * bkey_packed_successor())
562 static void set_format_field(struct bkey_format *f, enum bch_bkey_fields i,
563 unsigned bits, u64 offset)
565 unsigned unpacked_bits = bch2_bkey_format_current.bits_per_field[i];
566 u64 unpacked_max = ~((~0ULL << 1) << (unpacked_bits - 1));
568 bits = min(bits, unpacked_bits);
570 offset = bits == unpacked_bits ? 0 : min(offset, unpacked_max - ((1ULL << bits) - 1));
572 f->bits_per_field[i] = bits;
573 f->field_offset[i] = cpu_to_le64(offset);
576 struct bkey_format bch2_bkey_format_done(struct bkey_format_state *s)
578 unsigned i, bits = KEY_PACKED_BITS_START;
579 struct bkey_format ret = {
580 .nr_fields = BKEY_NR_FIELDS,
583 for (i = 0; i < ARRAY_SIZE(s->field_min); i++) {
584 s->field_min[i] = min(s->field_min[i], s->field_max[i]);
586 set_format_field(&ret, i,
587 fls64(s->field_max[i] - s->field_min[i]),
590 bits += ret.bits_per_field[i];
593 /* allow for extent merging: */
594 if (ret.bits_per_field[BKEY_FIELD_SIZE]) {
595 ret.bits_per_field[BKEY_FIELD_SIZE] += 4;
599 ret.key_u64s = DIV_ROUND_UP(bits, 64);
601 /* if we have enough spare bits, round fields up to nearest byte */
602 bits = ret.key_u64s * 64 - bits;
604 for (i = 0; i < ARRAY_SIZE(ret.bits_per_field); i++) {
605 unsigned r = round_up(ret.bits_per_field[i], 8) -
606 ret.bits_per_field[i];
609 set_format_field(&ret, i,
610 ret.bits_per_field[i] + r,
611 le64_to_cpu(ret.field_offset[i]));
616 EBUG_ON(bch2_bkey_format_validate(&ret));
620 const char *bch2_bkey_format_validate(struct bkey_format *f)
622 unsigned i, bits = KEY_PACKED_BITS_START;
624 if (f->nr_fields != BKEY_NR_FIELDS)
625 return "incorrect number of fields";
628 * Verify that the packed format can't represent fields larger than the
631 for (i = 0; i < f->nr_fields; i++) {
632 unsigned unpacked_bits = bch2_bkey_format_current.bits_per_field[i];
633 u64 unpacked_max = ~((~0ULL << 1) << (unpacked_bits - 1));
634 u64 packed_max = f->bits_per_field[i]
635 ? ~((~0ULL << 1) << (f->bits_per_field[i] - 1))
637 u64 field_offset = le64_to_cpu(f->field_offset[i]);
639 if (packed_max + field_offset < packed_max ||
640 packed_max + field_offset > unpacked_max)
641 return "field too large";
643 bits += f->bits_per_field[i];
646 if (f->key_u64s != DIV_ROUND_UP(bits, 64))
647 return "incorrect key_u64s";
653 * Most significant differing bit
654 * Bits are indexed from 0 - return is [0, nr_key_bits)
657 unsigned bch2_bkey_greatest_differing_bit(const struct btree *b,
658 const struct bkey_packed *l_k,
659 const struct bkey_packed *r_k)
661 const u64 *l = high_word(&b->format, l_k);
662 const u64 *r = high_word(&b->format, r_k);
663 unsigned nr_key_bits = b->nr_key_bits;
664 unsigned word_bits = 64 - high_bit_offset;
667 EBUG_ON(b->nr_key_bits != bkey_format_key_bits(&b->format));
669 /* for big endian, skip past header */
670 l_v = *l & (~0ULL >> high_bit_offset);
671 r_v = *r & (~0ULL >> high_bit_offset);
673 while (nr_key_bits) {
674 if (nr_key_bits < word_bits) {
675 l_v >>= word_bits - nr_key_bits;
676 r_v >>= word_bits - nr_key_bits;
679 nr_key_bits -= word_bits;
683 return fls64(l_v ^ r_v) - 1 + nr_key_bits;
698 * Bits are indexed from 0 - return is [0, nr_key_bits)
701 unsigned bch2_bkey_ffs(const struct btree *b, const struct bkey_packed *k)
703 const u64 *p = high_word(&b->format, k);
704 unsigned nr_key_bits = b->nr_key_bits;
705 unsigned ret = 0, offset;
707 EBUG_ON(b->nr_key_bits != bkey_format_key_bits(&b->format));
709 offset = nr_key_bits;
710 while (offset > 64) {
715 offset = 64 - offset;
717 while (nr_key_bits) {
718 unsigned bits = nr_key_bits + offset < 64
722 u64 mask = (~0ULL >> (64 - bits)) << offset;
725 return ret + __ffs64(*p & mask) - offset;
738 static inline int __bkey_cmp_bits(const u64 *l, const u64 *r,
739 unsigned nr_key_bits)
744 /* we shouldn't need asm for this, but gcc is being retarded: */
746 asm(".intel_syntax noprefix;"
758 "lea rdi, [rdi - 8];"
759 "lea rsi, [rsi - 8];"
774 ".att_syntax prefix;"
775 : "=&D" (d0), "=&S" (d1), "=&d" (d2), "=&c" (d3), "=&a" (cmp)
776 : "0" (l), "1" (r), "3" (nr_key_bits)
777 : "r8", "r9", "cc", "memory");
782 #define I(_x) (*(out)++ = (_x))
784 #define I2(i0, i1) (I1(i0), I(i1))
785 #define I3(i0, i1, i2) (I2(i0, i1), I(i2))
786 #define I4(i0, i1, i2, i3) (I3(i0, i1, i2), I(i3))
787 #define I5(i0, i1, i2, i3, i4) (I4(i0, i1, i2, i3), I(i4))
789 static u8 *compile_bkey_field(const struct bkey_format *format, u8 *out,
790 enum bch_bkey_fields field,
791 unsigned dst_offset, unsigned dst_size,
794 unsigned bits = format->bits_per_field[field];
795 u64 offset = le64_to_cpu(format->field_offset[field]);
796 unsigned i, byte, bit_offset, align, shl, shr;
798 if (!bits && !offset) {
809 /* just return offset: */
813 if (offset > S32_MAX) {
814 /* mov [rdi + dst_offset], offset */
815 I3(0xc7, 0x47, dst_offset);
816 memcpy(out, &offset, 4);
819 I3(0xc7, 0x47, dst_offset + 4);
820 memcpy(out, (void *) &offset + 4, 4);
823 /* mov [rdi + dst_offset], offset */
825 I4(0x48, 0xc7, 0x47, dst_offset);
826 memcpy(out, &offset, 4);
831 /* mov [rdi + dst_offset], offset */
832 I3(0xc7, 0x47, dst_offset);
833 memcpy(out, &offset, 4);
843 bit_offset = format->key_u64s * 64;
844 for (i = 0; i <= field; i++)
845 bit_offset -= format->bits_per_field[i];
847 byte = bit_offset / 8;
848 bit_offset -= byte * 8;
852 if (bit_offset == 0 && bits == 8) {
853 /* movzx eax, BYTE PTR [rsi + imm8] */
854 I4(0x0f, 0xb6, 0x46, byte);
855 } else if (bit_offset == 0 && bits == 16) {
856 /* movzx eax, WORD PTR [rsi + imm8] */
857 I4(0x0f, 0xb7, 0x46, byte);
858 } else if (bit_offset + bits <= 32) {
859 align = min(4 - DIV_ROUND_UP(bit_offset + bits, 8), byte & 3);
861 bit_offset += align * 8;
863 BUG_ON(bit_offset + bits > 32);
865 /* mov eax, [rsi + imm8] */
866 I3(0x8b, 0x46, byte);
870 I3(0xc1, 0xe8, bit_offset);
873 if (bit_offset + bits < 32) {
874 unsigned mask = ~0U >> (32 - bits);
878 memcpy(out, &mask, 4);
881 } else if (bit_offset + bits <= 64) {
882 align = min(8 - DIV_ROUND_UP(bit_offset + bits, 8), byte & 7);
884 bit_offset += align * 8;
886 BUG_ON(bit_offset + bits > 64);
888 /* mov rax, [rsi + imm8] */
889 I4(0x48, 0x8b, 0x46, byte);
891 shl = 64 - bit_offset - bits;
892 shr = bit_offset + shl;
896 I4(0x48, 0xc1, 0xe0, shl);
901 I4(0x48, 0xc1, 0xe8, shr);
904 align = min(4 - DIV_ROUND_UP(bit_offset + bits, 8), byte & 3);
906 bit_offset += align * 8;
908 BUG_ON(bit_offset + bits > 96);
910 /* mov rax, [rsi + byte] */
911 I4(0x48, 0x8b, 0x46, byte);
913 /* mov edx, [rsi + byte + 8] */
914 I3(0x8b, 0x56, byte + 8);
916 /* bits from next word: */
917 shr = bit_offset + bits - 64;
918 BUG_ON(shr > bit_offset);
920 /* shr rax, bit_offset */
921 I4(0x48, 0xc1, 0xe8, shr);
924 I4(0x48, 0xc1, 0xe2, 64 - shr);
927 I3(0x48, 0x09, 0xd0);
929 shr = bit_offset - shr;
933 I4(0x48, 0xc1, 0xe8, shr);
938 if (offset > S32_MAX) {
941 memcpy(out, &offset, 8);
944 I3(0x48, 0x01, 0xd0);
945 } else if (offset + (~0ULL >> (64 - bits)) > U32_MAX) {
948 memcpy(out, &offset, 4);
953 memcpy(out, &offset, 4);
959 /* mov [rdi + dst_offset], rax */
960 I4(0x48, 0x89, 0x47, dst_offset);
963 /* mov [rdi + dst_offset], eax */
964 I3(0x89, 0x47, dst_offset);
973 int bch2_compile_bkey_format(const struct bkey_format *format, void *_out)
975 bool eax_zeroed = false;
979 * rdi: dst - unpacked key
980 * rsi: src - packed key
983 /* k->u64s, k->format, k->type */
988 /* add eax, BKEY_U64s - format->key_u64s */
989 I5(0x05, BKEY_U64s - format->key_u64s, KEY_FORMAT_CURRENT, 0, 0);
991 /* and eax, imm32: mask out k->pad: */
992 I5(0x25, 0xff, 0xff, 0xff, 0);
997 #define x(id, field) \
998 out = compile_bkey_field(format, out, id, \
999 offsetof(struct bkey, field), \
1000 sizeof(((struct bkey *) NULL)->field), \
1008 return (void *) out - _out;
1012 static inline int __bkey_cmp_bits(const u64 *l, const u64 *r,
1013 unsigned nr_key_bits)
1020 /* for big endian, skip past header */
1021 nr_key_bits += high_bit_offset;
1022 l_v = *l & (~0ULL >> high_bit_offset);
1023 r_v = *r & (~0ULL >> high_bit_offset);
1026 if (nr_key_bits < 64) {
1027 l_v >>= 64 - nr_key_bits;
1028 r_v >>= 64 - nr_key_bits;
1034 if (!nr_key_bits || l_v != r_v)
1044 return cmp_int(l_v, r_v);
1049 int __bch2_bkey_cmp_packed_format_checked(const struct bkey_packed *l,
1050 const struct bkey_packed *r,
1051 const struct btree *b)
1053 const struct bkey_format *f = &b->format;
1056 EBUG_ON(!bkey_packed(l) || !bkey_packed(r));
1057 EBUG_ON(b->nr_key_bits != bkey_format_key_bits(f));
1059 ret = __bkey_cmp_bits(high_word(f, l),
1063 EBUG_ON(ret != bpos_cmp(bkey_unpack_pos(b, l),
1064 bkey_unpack_pos(b, r)));
1069 int __bch2_bkey_cmp_left_packed_format_checked(const struct btree *b,
1070 const struct bkey_packed *l,
1071 const struct bpos *r)
1073 return bpos_cmp(bkey_unpack_pos_format_checked(b, l), *r);
1077 int bch2_bkey_cmp_packed(const struct btree *b,
1078 const struct bkey_packed *l,
1079 const struct bkey_packed *r)
1081 struct bkey unpacked;
1083 if (likely(bkey_packed(l) && bkey_packed(r)))
1084 return __bch2_bkey_cmp_packed_format_checked(l, r, b);
1086 if (bkey_packed(l)) {
1087 __bkey_unpack_key_format_checked(b, &unpacked, l);
1088 l = (void*) &unpacked;
1089 } else if (bkey_packed(r)) {
1090 __bkey_unpack_key_format_checked(b, &unpacked, r);
1091 r = (void*) &unpacked;
1094 return bpos_cmp(((struct bkey *) l)->p, ((struct bkey *) r)->p);
1098 int __bch2_bkey_cmp_left_packed(const struct btree *b,
1099 const struct bkey_packed *l,
1100 const struct bpos *r)
1102 const struct bkey *l_unpacked;
1104 return unlikely(l_unpacked = packed_to_bkey_c(l))
1105 ? bpos_cmp(l_unpacked->p, *r)
1106 : __bch2_bkey_cmp_left_packed_format_checked(b, l, r);
1109 void bch2_bpos_swab(struct bpos *p)
1112 u8 *h = ((u8 *) &p[1]) - 1;
1121 void bch2_bkey_swab_key(const struct bkey_format *_f, struct bkey_packed *k)
1123 const struct bkey_format *f = bkey_packed(k) ? _f : &bch2_bkey_format_current;
1124 u8 *l = k->key_start;
1125 u8 *h = (u8 *) (k->_data + f->key_u64s) - 1;
1134 #ifdef CONFIG_BCACHEFS_DEBUG
1135 void bch2_bkey_pack_test(void)
1137 struct bkey t = KEY(4134ULL, 1250629070527416633ULL, 0);
1138 struct bkey_packed p;
1140 struct bkey_format test_format = {
1142 .nr_fields = BKEY_NR_FIELDS,
1150 struct unpack_state in_s =
1151 unpack_state_init(&bch2_bkey_format_current, (void *) &t);
1152 struct pack_state out_s = pack_state_init(&test_format, &p);
1155 for (i = 0; i < out_s.format->nr_fields; i++) {
1156 u64 a, v = get_inc_field(&in_s, i);
1159 #define x(id, field) case id: a = t.field; break;
1167 panic("got %llu actual %llu i %u\n", v, a, i);
1169 if (!set_inc_field(&out_s, i, v))
1170 panic("failed at %u\n", i);
1173 BUG_ON(!bch2_bkey_pack_key(&p, &t, &test_format));