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Git 2.39.5
[alt-git.git] / pack-bitmap.c
blob440407f1be742c7e2a19a62f5adb968d409bcc29
1 #include "cache.h"
2 #include "commit.h"
3 #include "strbuf.h"
4 #include "tag.h"
5 #include "diff.h"
6 #include "revision.h"
7 #include "progress.h"
8 #include "list-objects.h"
9 #include "pack.h"
10 #include "pack-bitmap.h"
11 #include "pack-revindex.h"
12 #include "pack-objects.h"
13 #include "packfile.h"
14 #include "repository.h"
15 #include "object-store.h"
16 #include "list-objects-filter-options.h"
17 #include "midx.h"
18 #include "config.h"
19
20 /*
21 * An entry on the bitmap index, representing the bitmap for a given
22 * commit.
23 */
24 struct stored_bitmap {
25 struct object_id oid;
26 struct ewah_bitmap *root;
27 struct stored_bitmap *xor;
28 int flags;
29 };
30
31 /*
32 * The active bitmap index for a repository. By design, repositories only have
33 * a single bitmap index available (the index for the biggest packfile in
34 * the repository), since bitmap indexes need full closure.
35 *
36 * If there is more than one bitmap index available (e.g. because of alternates),
37 * the active bitmap index is the largest one.
38 */
39 struct bitmap_index {
40 /*
41 * The pack or multi-pack index (MIDX) that this bitmap index belongs
42 * to.
43 *
44 * Exactly one of these must be non-NULL; this specifies the object
45 * order used to interpret this bitmap.
46 */
47 struct packed_git *pack;
48 struct multi_pack_index *midx;
49
50 /*
51 * Mark the first `reuse_objects` in the packfile as reused:
52 * they will be sent as-is without using them for repacking
53 * calculations
54 */
55 uint32_t reuse_objects;
56
57 /* mmapped buffer of the whole bitmap index */
58 unsigned char *map;
59 size_t map_size; /* size of the mmaped buffer */
60 size_t map_pos; /* current position when loading the index */
61
62 /*
63 * Type indexes.
64 *
65 * Each bitmap marks which objects in the packfile are of the given
66 * type. This provides type information when yielding the objects from
67 * the packfile during a walk, which allows for better delta bases.
68 */
69 struct ewah_bitmap *commits;
70 struct ewah_bitmap *trees;
71 struct ewah_bitmap *blobs;
72 struct ewah_bitmap *tags;
73
74 /* Map from object ID -> `stored_bitmap` for all the bitmapped commits */
75 kh_oid_map_t *bitmaps;
76
77 /* Number of bitmapped commits */
78 uint32_t entry_count;
79
80 /* If not NULL, this is a name-hash cache pointing into map. */
81 uint32_t *hashes;
82
83 /* The checksum of the packfile or MIDX; points into map. */
84 const unsigned char *checksum;
85
86 /*
87 * If not NULL, this point into the commit table extension
88 * (within the memory mapped region `map`).
89 */
90 unsigned char *table_lookup;
91
92 /*
93 * Extended index.
94 *
95 * When trying to perform bitmap operations with objects that are not
96 * packed in `pack`, these objects are added to this "fake index" and
97 * are assumed to appear at the end of the packfile for all operations
98 */
99 struct eindex {
100 struct object **objects;
101 uint32_t *hashes;
102 uint32_t count, alloc;
103 kh_oid_pos_t *positions;
104 } ext_index;
105
106 /* Bitmap result of the last performed walk */
107 struct bitmap *result;
108
109 /* "have" bitmap from the last performed walk */
110 struct bitmap *haves;
111
112 /* Version of the bitmap index */
113 unsigned int version;
114 };
115
116 static struct ewah_bitmap *lookup_stored_bitmap(struct stored_bitmap *st)
117 {
118 struct ewah_bitmap *parent;
119 struct ewah_bitmap *composed;
120
121 if (!st->xor)
122 return st->root;
123
124 composed = ewah_pool_new();
125 parent = lookup_stored_bitmap(st->xor);
126 ewah_xor(st->root, parent, composed);
127
128 ewah_pool_free(st->root);
129 st->root = composed;
130 st->xor = NULL;
131
132 return composed;
133 }
134
135 /*
136 * Read a bitmap from the current read position on the mmaped
137 * index, and increase the read position accordingly
138 */
139 static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index)
140 {
141 struct ewah_bitmap *b = ewah_pool_new();
142
143 ssize_t bitmap_size = ewah_read_mmap(b,
144 index->map + index->map_pos,
145 index->map_size - index->map_pos);
146
147 if (bitmap_size < 0) {
148 error(_("failed to load bitmap index (corrupted?)"));
149 ewah_pool_free(b);
150 return NULL;
151 }
152
153 index->map_pos += bitmap_size;
154 return b;
155 }
156
157 static uint32_t bitmap_num_objects(struct bitmap_index *index)
158 {
159 if (index->midx)
160 return index->midx->num_objects;
161 return index->pack->num_objects;
162 }
163
164 static int load_bitmap_header(struct bitmap_index *index)
165 {
166 struct bitmap_disk_header *header = (void *)index->map;
167 size_t header_size = sizeof(*header) - GIT_MAX_RAWSZ + the_hash_algo->rawsz;
168
169 if (index->map_size < header_size + the_hash_algo->rawsz)
170 return error(_("corrupted bitmap index (too small)"));
171
172 if (memcmp(header->magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE)) != 0)
173 return error(_("corrupted bitmap index file (wrong header)"));
174
175 index->version = ntohs(header->version);
176 if (index->version != 1)
177 return error(_("unsupported version '%d' for bitmap index file"), index->version);
178
179 /* Parse known bitmap format options */
180 {
181 uint32_t flags = ntohs(header->options);
182 size_t cache_size = st_mult(bitmap_num_objects(index), sizeof(uint32_t));
183 unsigned char *index_end = index->map + index->map_size - the_hash_algo->rawsz;
184
185 if ((flags & BITMAP_OPT_FULL_DAG) == 0)
186 BUG("unsupported options for bitmap index file "
187 "(Git requires BITMAP_OPT_FULL_DAG)");
188
189 if (flags & BITMAP_OPT_HASH_CACHE) {
190 if (cache_size > index_end - index->map - header_size)
191 return error(_("corrupted bitmap index file (too short to fit hash cache)"));
192 index->hashes = (void *)(index_end - cache_size);
193 index_end -= cache_size;
194 }
195
196 if (flags & BITMAP_OPT_LOOKUP_TABLE) {
197 size_t table_size = st_mult(ntohl(header->entry_count),
198 BITMAP_LOOKUP_TABLE_TRIPLET_WIDTH);
199 if (table_size > index_end - index->map - header_size)
200 return error(_("corrupted bitmap index file (too short to fit lookup table)"));
201 if (git_env_bool("GIT_TEST_READ_COMMIT_TABLE", 1))
202 index->table_lookup = (void *)(index_end - table_size);
203 index_end -= table_size;
204 }
205 }
206
207 index->entry_count = ntohl(header->entry_count);
208 index->checksum = header->checksum;
209 index->map_pos += header_size;
210 return 0;
211 }
212
213 static struct stored_bitmap *store_bitmap(struct bitmap_index *index,
214 struct ewah_bitmap *root,
215 const struct object_id *oid,
216 struct stored_bitmap *xor_with,
217 int flags)
218 {
219 struct stored_bitmap *stored;
220 khiter_t hash_pos;
221 int ret;
222
223 stored = xmalloc(sizeof(struct stored_bitmap));
224 stored->root = root;
225 stored->xor = xor_with;
226 stored->flags = flags;
227 oidcpy(&stored->oid, oid);
228
229 hash_pos = kh_put_oid_map(index->bitmaps, stored->oid, &ret);
230
231 /*
232 * A 0 return code means the insertion succeeded with no changes,
233 * because the SHA1 already existed on the map. This is bad, there
234 * shouldn't be duplicated commits in the index.
235 */
236 if (ret == 0) {
237 error(_("duplicate entry in bitmap index: '%s'"), oid_to_hex(oid));
238 return NULL;
239 }
240
241 kh_value(index->bitmaps, hash_pos) = stored;
242 return stored;
243 }
244
245 static inline uint32_t read_be32(const unsigned char *buffer, size_t *pos)
246 {
247 uint32_t result = get_be32(buffer + *pos);
248 (*pos) += sizeof(result);
249 return result;
250 }
251
252 static inline uint8_t read_u8(const unsigned char *buffer, size_t *pos)
253 {
254 return buffer[(*pos)++];
255 }
256
257 #define MAX_XOR_OFFSET 160
258
259 static int nth_bitmap_object_oid(struct bitmap_index *index,
260 struct object_id *oid,
261 uint32_t n)
262 {
263 if (index->midx)
264 return nth_midxed_object_oid(oid, index->midx, n) ? 0 : -1;
265 return nth_packed_object_id(oid, index->pack, n);
266 }
267
268 static int load_bitmap_entries_v1(struct bitmap_index *index)
269 {
270 uint32_t i;
271 struct stored_bitmap *recent_bitmaps[MAX_XOR_OFFSET] = { NULL };
272
273 for (i = 0; i < index->entry_count; ++i) {
274 int xor_offset, flags;
275 struct ewah_bitmap *bitmap = NULL;
276 struct stored_bitmap *xor_bitmap = NULL;
277 uint32_t commit_idx_pos;
278 struct object_id oid;
279
280 if (index->map_size - index->map_pos < 6)
281 return error(_("corrupt ewah bitmap: truncated header for entry %d"), i);
282
283 commit_idx_pos = read_be32(index->map, &index->map_pos);
284 xor_offset = read_u8(index->map, &index->map_pos);
285 flags = read_u8(index->map, &index->map_pos);
286
287 if (nth_bitmap_object_oid(index, &oid, commit_idx_pos) < 0)
288 return error(_("corrupt ewah bitmap: commit index %u out of range"),
289 (unsigned)commit_idx_pos);
290
291 bitmap = read_bitmap_1(index);
292 if (!bitmap)
293 return -1;
294
295 if (xor_offset > MAX_XOR_OFFSET || xor_offset > i)
296 return error(_("corrupted bitmap pack index"));
297
298 if (xor_offset > 0) {
299 xor_bitmap = recent_bitmaps[(i - xor_offset) % MAX_XOR_OFFSET];
300
301 if (!xor_bitmap)
302 return error(_("invalid XOR offset in bitmap pack index"));
303 }
304
305 recent_bitmaps[i % MAX_XOR_OFFSET] = store_bitmap(
306 index, bitmap, &oid, xor_bitmap, flags);
307 }
308
309 return 0;
310 }
311
312 char *midx_bitmap_filename(struct multi_pack_index *midx)
313 {
314 struct strbuf buf = STRBUF_INIT;
315
316 get_midx_filename(&buf, midx->object_dir);
317 strbuf_addf(&buf, "-%s.bitmap", hash_to_hex(get_midx_checksum(midx)));
318
319 return strbuf_detach(&buf, NULL);
320 }
321
322 char *pack_bitmap_filename(struct packed_git *p)
323 {
324 size_t len;
325
326 if (!strip_suffix(p->pack_name, ".pack", &len))
327 BUG("pack_name does not end in .pack");
328 return xstrfmt("%.*s.bitmap", (int)len, p->pack_name);
329 }
330
331 static int open_midx_bitmap_1(struct bitmap_index *bitmap_git,
332 struct multi_pack_index *midx)
333 {
334 struct stat st;
335 char *bitmap_name = midx_bitmap_filename(midx);
336 int fd = git_open(bitmap_name);
337 uint32_t i;
338 struct packed_git *preferred;
339
340 if (fd < 0) {
341 if (errno != ENOENT)
342 warning_errno("cannot open '%s'", bitmap_name);
343 free(bitmap_name);
344 return -1;
345 }
346 free(bitmap_name);
347
348 if (fstat(fd, &st)) {
349 error_errno(_("cannot fstat bitmap file"));
350 close(fd);
351 return -1;
352 }
353
354 if (bitmap_git->pack || bitmap_git->midx) {
355 struct strbuf buf = STRBUF_INIT;
356 get_midx_filename(&buf, midx->object_dir);
357 /* ignore extra bitmap file; we can only handle one */
358 warning(_("ignoring extra bitmap file: '%s'"), buf.buf);
359 close(fd);
360 strbuf_release(&buf);
361 return -1;
362 }
363
364 bitmap_git->midx = midx;
365 bitmap_git->map_size = xsize_t(st.st_size);
366 bitmap_git->map_pos = 0;
367 bitmap_git->map = xmmap(NULL, bitmap_git->map_size, PROT_READ,
368 MAP_PRIVATE, fd, 0);
369 close(fd);
370
371 if (load_bitmap_header(bitmap_git) < 0)
372 goto cleanup;
373
374 if (!hasheq(get_midx_checksum(bitmap_git->midx), bitmap_git->checksum)) {
375 error(_("checksum doesn't match in MIDX and bitmap"));
376 goto cleanup;
377 }
378
379 if (load_midx_revindex(bitmap_git->midx) < 0) {
380 warning(_("multi-pack bitmap is missing required reverse index"));
381 goto cleanup;
382 }
383
384 for (i = 0; i < bitmap_git->midx->num_packs; i++) {
385 if (prepare_midx_pack(the_repository, bitmap_git->midx, i))
386 die(_("could not open pack %s"),
387 bitmap_git->midx->pack_names[i]);
388 }
389
390 preferred = bitmap_git->midx->packs[midx_preferred_pack(bitmap_git)];
391 if (!is_pack_valid(preferred)) {
392 warning(_("preferred pack (%s) is invalid"),
393 preferred->pack_name);
394 goto cleanup;
395 }
396
397 return 0;
398
399 cleanup:
400 munmap(bitmap_git->map, bitmap_git->map_size);
401 bitmap_git->map_size = 0;
402 bitmap_git->map_pos = 0;
403 bitmap_git->map = NULL;
404 bitmap_git->midx = NULL;
405 return -1;
406 }
407
408 static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git *packfile)
409 {
410 int fd;
411 struct stat st;
412 char *bitmap_name;
413
414 if (open_pack_index(packfile))
415 return -1;
416
417 bitmap_name = pack_bitmap_filename(packfile);
418 fd = git_open(bitmap_name);
419
420 if (fd < 0) {
421 if (errno != ENOENT)
422 warning_errno("cannot open '%s'", bitmap_name);
423 free(bitmap_name);
424 return -1;
425 }
426 free(bitmap_name);
427
428 if (fstat(fd, &st)) {
429 error_errno(_("cannot fstat bitmap file"));
430 close(fd);
431 return -1;
432 }
433
434 if (bitmap_git->pack || bitmap_git->midx) {
435 /* ignore extra bitmap file; we can only handle one */
436 warning(_("ignoring extra bitmap file: '%s'"), packfile->pack_name);
437 close(fd);
438 return -1;
439 }
440
441 if (!is_pack_valid(packfile)) {
442 close(fd);
443 return -1;
444 }
445
446 bitmap_git->pack = packfile;
447 bitmap_git->map_size = xsize_t(st.st_size);
448 bitmap_git->map = xmmap(NULL, bitmap_git->map_size, PROT_READ, MAP_PRIVATE, fd, 0);
449 bitmap_git->map_pos = 0;
450 close(fd);
451
452 if (load_bitmap_header(bitmap_git) < 0) {
453 munmap(bitmap_git->map, bitmap_git->map_size);
454 bitmap_git->map = NULL;
455 bitmap_git->map_size = 0;
456 bitmap_git->map_pos = 0;
457 bitmap_git->pack = NULL;
458 return -1;
459 }
460
461 return 0;
462 }
463
464 static int load_reverse_index(struct bitmap_index *bitmap_git)
465 {
466 if (bitmap_is_midx(bitmap_git)) {
467 uint32_t i;
468 int ret;
469
470 /*
471 * The multi-pack-index's .rev file is already loaded via
472 * open_pack_bitmap_1().
473 *
474 * But we still need to open the individual pack .rev files,
475 * since we will need to make use of them in pack-objects.
476 */
477 for (i = 0; i < bitmap_git->midx->num_packs; i++) {
478 ret = load_pack_revindex(bitmap_git->midx->packs[i]);
479 if (ret)
480 return ret;
481 }
482 return 0;
483 }
484 return load_pack_revindex(bitmap_git->pack);
485 }
486
487 static int load_bitmap(struct bitmap_index *bitmap_git)
488 {
489 assert(bitmap_git->map);
490
491 bitmap_git->bitmaps = kh_init_oid_map();
492 bitmap_git->ext_index.positions = kh_init_oid_pos();
493
494 if (load_reverse_index(bitmap_git))
495 goto failed;
496
497 if (!(bitmap_git->commits = read_bitmap_1(bitmap_git)) ||
498 !(bitmap_git->trees = read_bitmap_1(bitmap_git)) ||
499 !(bitmap_git->blobs = read_bitmap_1(bitmap_git)) ||
500 !(bitmap_git->tags = read_bitmap_1(bitmap_git)))
501 goto failed;
502
503 if (!bitmap_git->table_lookup && load_bitmap_entries_v1(bitmap_git) < 0)
504 goto failed;
505
506 return 0;
507
508 failed:
509 munmap(bitmap_git->map, bitmap_git->map_size);
510 bitmap_git->map = NULL;
511 bitmap_git->map_size = 0;
512
513 kh_destroy_oid_map(bitmap_git->bitmaps);
514 bitmap_git->bitmaps = NULL;
515
516 kh_destroy_oid_pos(bitmap_git->ext_index.positions);
517 bitmap_git->ext_index.positions = NULL;
518
519 return -1;
520 }
521
522 static int open_pack_bitmap(struct repository *r,
523 struct bitmap_index *bitmap_git)
524 {
525 struct packed_git *p;
526 int ret = -1;
527
528 assert(!bitmap_git->map);
529
530 for (p = get_all_packs(r); p; p = p->next) {
531 if (open_pack_bitmap_1(bitmap_git, p) == 0)
532 ret = 0;
533 }
534
535 return ret;
536 }
537
538 static int open_midx_bitmap(struct repository *r,
539 struct bitmap_index *bitmap_git)
540 {
541 int ret = -1;
542 struct multi_pack_index *midx;
543
544 assert(!bitmap_git->map);
545
546 for (midx = get_multi_pack_index(r); midx; midx = midx->next) {
547 if (!open_midx_bitmap_1(bitmap_git, midx))
548 ret = 0;
549 }
550 return ret;
551 }
552
553 static int open_bitmap(struct repository *r,
554 struct bitmap_index *bitmap_git)
555 {
556 assert(!bitmap_git->map);
557
558 if (!open_midx_bitmap(r, bitmap_git))
559 return 0;
560 return open_pack_bitmap(r, bitmap_git);
561 }
562
563 struct bitmap_index *prepare_bitmap_git(struct repository *r)
564 {
565 struct bitmap_index *bitmap_git = xcalloc(1, sizeof(*bitmap_git));
566
567 if (!open_bitmap(r, bitmap_git) && !load_bitmap(bitmap_git))
568 return bitmap_git;
569
570 free_bitmap_index(bitmap_git);
571 return NULL;
572 }
573
574 struct bitmap_index *prepare_midx_bitmap_git(struct multi_pack_index *midx)
575 {
576 struct bitmap_index *bitmap_git = xcalloc(1, sizeof(*bitmap_git));
577
578 if (!open_midx_bitmap_1(bitmap_git, midx) && !load_bitmap(bitmap_git))
579 return bitmap_git;
580
581 free_bitmap_index(bitmap_git);
582 return NULL;
583 }
584
585 struct include_data {
586 struct bitmap_index *bitmap_git;
587 struct bitmap *base;
588 struct bitmap *seen;
589 };
590
591 struct bitmap_lookup_table_triplet {
592 uint32_t commit_pos;
593 uint64_t offset;
594 uint32_t xor_row;
595 };
596
597 struct bitmap_lookup_table_xor_item {
598 struct object_id oid;
599 uint64_t offset;
600 };
601
602 /*
603 * Given a `triplet` struct pointer and pointer `p`, this
604 * function reads the triplet beginning at `p` into the struct.
605 * Note that this function assumes that there is enough memory
606 * left for filling the `triplet` struct from `p`.
607 */
608 static int bitmap_lookup_table_get_triplet_by_pointer(struct bitmap_lookup_table_triplet *triplet,
609 const unsigned char *p)
610 {
611 if (!triplet)
612 return -1;
613
614 triplet->commit_pos = get_be32(p);
615 p += sizeof(uint32_t);
616 triplet->offset = get_be64(p);
617 p += sizeof(uint64_t);
618 triplet->xor_row = get_be32(p);
619 return 0;
620 }
621
622 /*
623 * This function gets the raw triplet from `row`'th row in the
624 * lookup table and fills that data to the `triplet`.
625 */
626 static int bitmap_lookup_table_get_triplet(struct bitmap_index *bitmap_git,
627 uint32_t pos,
628 struct bitmap_lookup_table_triplet *triplet)
629 {
630 unsigned char *p = NULL;
631 if (pos >= bitmap_git->entry_count)
632 return error(_("corrupt bitmap lookup table: triplet position out of index"));
633
634 p = bitmap_git->table_lookup + st_mult(pos, BITMAP_LOOKUP_TABLE_TRIPLET_WIDTH);
635
636 return bitmap_lookup_table_get_triplet_by_pointer(triplet, p);
637 }
638
639 /*
640 * Searches for a matching triplet. `commit_pos` is a pointer
641 * to the wanted commit position value. `table_entry` points to
642 * a triplet in lookup table. The first 4 bytes of each
643 * triplet (pointed by `table_entry`) are compared with `*commit_pos`.
644 */
645 static int triplet_cmp(const void *commit_pos, const void *table_entry)
646 {
647
648 uint32_t a = *(uint32_t *)commit_pos;
649 uint32_t b = get_be32(table_entry);
650 if (a > b)
651 return 1;
652 else if (a < b)
653 return -1;
654
655 return 0;
656 }
657
658 static uint32_t bitmap_bsearch_pos(struct bitmap_index *bitmap_git,
659 struct object_id *oid,
660 uint32_t *result)
661 {
662 int found;
663
664 if (bitmap_is_midx(bitmap_git))
665 found = bsearch_midx(oid, bitmap_git->midx, result);
666 else
667 found = bsearch_pack(oid, bitmap_git->pack, result);
668
669 return found;
670 }
671
672 /*
673 * `bsearch_triplet_by_pos` function searches for the raw triplet
674 * having commit position same as `commit_pos` and fills `triplet`
675 * object from the raw triplet. Returns 1 on success and 0 on
676 * failure.
677 */
678 static int bitmap_bsearch_triplet_by_pos(uint32_t commit_pos,
679 struct bitmap_index *bitmap_git,
680 struct bitmap_lookup_table_triplet *triplet)
681 {
682 unsigned char *p = bsearch(&commit_pos, bitmap_git->table_lookup, bitmap_git->entry_count,
683 BITMAP_LOOKUP_TABLE_TRIPLET_WIDTH, triplet_cmp);
684
685 if (!p)
686 return -1;
687
688 return bitmap_lookup_table_get_triplet_by_pointer(triplet, p);
689 }
690
691 static struct stored_bitmap *lazy_bitmap_for_commit(struct bitmap_index *bitmap_git,
692 struct commit *commit)
693 {
694 uint32_t commit_pos, xor_row;
695 uint64_t offset;
696 int flags;
697 struct bitmap_lookup_table_triplet triplet;
698 struct object_id *oid = &commit->object.oid;
699 struct ewah_bitmap *bitmap;
700 struct stored_bitmap *xor_bitmap = NULL;
701 const int bitmap_header_size = 6;
702 static struct bitmap_lookup_table_xor_item *xor_items = NULL;
703 static size_t xor_items_nr = 0, xor_items_alloc = 0;
704 static int is_corrupt = 0;
705 int xor_flags;
706 khiter_t hash_pos;
707 struct bitmap_lookup_table_xor_item *xor_item;
708
709 if (is_corrupt)
710 return NULL;
711
712 if (!bitmap_bsearch_pos(bitmap_git, oid, &commit_pos))
713 return NULL;
714
715 if (bitmap_bsearch_triplet_by_pos(commit_pos, bitmap_git, &triplet) < 0)
716 return NULL;
717
718 xor_items_nr = 0;
719 offset = triplet.offset;
720 xor_row = triplet.xor_row;
721
722 while (xor_row != 0xffffffff) {
723 ALLOC_GROW(xor_items, xor_items_nr + 1, xor_items_alloc);
724
725 if (xor_items_nr + 1 >= bitmap_git->entry_count) {
726 error(_("corrupt bitmap lookup table: xor chain exceeds entry count"));
727 goto corrupt;
728 }
729
730 if (bitmap_lookup_table_get_triplet(bitmap_git, xor_row, &triplet) < 0)
731 goto corrupt;
732
733 xor_item = &xor_items[xor_items_nr];
734 xor_item->offset = triplet.offset;
735
736 if (nth_bitmap_object_oid(bitmap_git, &xor_item->oid, triplet.commit_pos) < 0) {
737 error(_("corrupt bitmap lookup table: commit index %u out of range"),
738 triplet.commit_pos);
739 goto corrupt;
740 }
741
742 hash_pos = kh_get_oid_map(bitmap_git->bitmaps, xor_item->oid);
743
744 /*
745 * If desired bitmap is already stored, we don't need
746 * to iterate further. Because we know that bitmaps
747 * that are needed to be parsed to parse this bitmap
748 * has already been stored. So, assign this stored bitmap
749 * to the xor_bitmap.
750 */
751 if (hash_pos < kh_end(bitmap_git->bitmaps) &&
752 (xor_bitmap = kh_value(bitmap_git->bitmaps, hash_pos)))
753 break;
754 xor_items_nr++;
755 xor_row = triplet.xor_row;
756 }
757
758 while (xor_items_nr) {
759 xor_item = &xor_items[xor_items_nr - 1];
760 bitmap_git->map_pos = xor_item->offset;
761 if (bitmap_git->map_size - bitmap_git->map_pos < bitmap_header_size) {
762 error(_("corrupt ewah bitmap: truncated header for bitmap of commit \"%s\""),
763 oid_to_hex(&xor_item->oid));
764 goto corrupt;
765 }
766
767 bitmap_git->map_pos += sizeof(uint32_t) + sizeof(uint8_t);
768 xor_flags = read_u8(bitmap_git->map, &bitmap_git->map_pos);
769 bitmap = read_bitmap_1(bitmap_git);
770
771 if (!bitmap)
772 goto corrupt;
773
774 xor_bitmap = store_bitmap(bitmap_git, bitmap, &xor_item->oid, xor_bitmap, xor_flags);
775 xor_items_nr--;
776 }
777
778 bitmap_git->map_pos = offset;
779 if (bitmap_git->map_size - bitmap_git->map_pos < bitmap_header_size) {
780 error(_("corrupt ewah bitmap: truncated header for bitmap of commit \"%s\""),
781 oid_to_hex(oid));
782 goto corrupt;
783 }
784
785 /*
786 * Don't bother reading the commit's index position or its xor
787 * offset:
788 *
789 * - The commit's index position is irrelevant to us, since
790 * load_bitmap_entries_v1 only uses it to learn the object
791 * id which is used to compute the hashmap's key. We already
792 * have an object id, so no need to look it up again.
793 *
794 * - The xor_offset is unusable for us, since it specifies how
795 * many entries previous to ours we should look at. This
796 * makes sense when reading the bitmaps sequentially (as in
797 * load_bitmap_entries_v1()), since we can keep track of
798 * each bitmap as we read them.
799 *
800 * But it can't work for us, since the bitmap's don't have a
801 * fixed size. So we learn the position of the xor'd bitmap
802 * from the commit table (and resolve it to a bitmap in the
803 * above if-statement).
804 *
805 * Instead, we can skip ahead and immediately read the flags and
806 * ewah bitmap.
807 */
808 bitmap_git->map_pos += sizeof(uint32_t) + sizeof(uint8_t);
809 flags = read_u8(bitmap_git->map, &bitmap_git->map_pos);
810 bitmap = read_bitmap_1(bitmap_git);
811
812 if (!bitmap)
813 goto corrupt;
814
815 return store_bitmap(bitmap_git, bitmap, oid, xor_bitmap, flags);
816
817 corrupt:
818 free(xor_items);
819 is_corrupt = 1;
820 return NULL;
821 }
822
823 struct ewah_bitmap *bitmap_for_commit(struct bitmap_index *bitmap_git,
824 struct commit *commit)
825 {
826 khiter_t hash_pos = kh_get_oid_map(bitmap_git->bitmaps,
827 commit->object.oid);
828 if (hash_pos >= kh_end(bitmap_git->bitmaps)) {
829 struct stored_bitmap *bitmap = NULL;
830 if (!bitmap_git->table_lookup)
831 return NULL;
832
833 /* this is a fairly hot codepath - no trace2_region please */
834 /* NEEDSWORK: cache misses aren't recorded */
835 bitmap = lazy_bitmap_for_commit(bitmap_git, commit);
836 if (!bitmap)
837 return NULL;
838 return lookup_stored_bitmap(bitmap);
839 }
840 return lookup_stored_bitmap(kh_value(bitmap_git->bitmaps, hash_pos));
841 }
842
843 static inline int bitmap_position_extended(struct bitmap_index *bitmap_git,
844 const struct object_id *oid)
845 {
846 kh_oid_pos_t *positions = bitmap_git->ext_index.positions;
847 khiter_t pos = kh_get_oid_pos(positions, *oid);
848
849 if (pos < kh_end(positions)) {
850 int bitmap_pos = kh_value(positions, pos);
851 return bitmap_pos + bitmap_num_objects(bitmap_git);
852 }
853
854 return -1;
855 }
856
857 static inline int bitmap_position_packfile(struct bitmap_index *bitmap_git,
858 const struct object_id *oid)
859 {
860 uint32_t pos;
861 off_t offset = find_pack_entry_one(oid->hash, bitmap_git->pack);
862 if (!offset)
863 return -1;
864
865 if (offset_to_pack_pos(bitmap_git->pack, offset, &pos) < 0)
866 return -1;
867 return pos;
868 }
869
870 static int bitmap_position_midx(struct bitmap_index *bitmap_git,
871 const struct object_id *oid)
872 {
873 uint32_t want, got;
874 if (!bsearch_midx(oid, bitmap_git->midx, &want))
875 return -1;
876
877 if (midx_to_pack_pos(bitmap_git->midx, want, &got) < 0)
878 return -1;
879 return got;
880 }
881
882 static int bitmap_position(struct bitmap_index *bitmap_git,
883 const struct object_id *oid)
884 {
885 int pos;
886 if (bitmap_is_midx(bitmap_git))
887 pos = bitmap_position_midx(bitmap_git, oid);
888 else
889 pos = bitmap_position_packfile(bitmap_git, oid);
890 return (pos >= 0) ? pos : bitmap_position_extended(bitmap_git, oid);
891 }
892
893 static int ext_index_add_object(struct bitmap_index *bitmap_git,
894 struct object *object, const char *name)
895 {
896 struct eindex *eindex = &bitmap_git->ext_index;
897
898 khiter_t hash_pos;
899 int hash_ret;
900 int bitmap_pos;
901
902 hash_pos = kh_put_oid_pos(eindex->positions, object->oid, &hash_ret);
903 if (hash_ret > 0) {
904 if (eindex->count >= eindex->alloc) {
905 eindex->alloc = (eindex->alloc + 16) * 3 / 2;
906 REALLOC_ARRAY(eindex->objects, eindex->alloc);
907 REALLOC_ARRAY(eindex->hashes, eindex->alloc);
908 }
909
910 bitmap_pos = eindex->count;
911 eindex->objects[eindex->count] = object;
912 eindex->hashes[eindex->count] = pack_name_hash(name);
913 kh_value(eindex->positions, hash_pos) = bitmap_pos;
914 eindex->count++;
915 } else {
916 bitmap_pos = kh_value(eindex->positions, hash_pos);
917 }
918
919 return bitmap_pos + bitmap_num_objects(bitmap_git);
920 }
921
922 struct bitmap_show_data {
923 struct bitmap_index *bitmap_git;
924 struct bitmap *base;
925 };
926
927 static void show_object(struct object *object, const char *name, void *data_)
928 {
929 struct bitmap_show_data *data = data_;
930 int bitmap_pos;
931
932 bitmap_pos = bitmap_position(data->bitmap_git, &object->oid);
933
934 if (bitmap_pos < 0)
935 bitmap_pos = ext_index_add_object(data->bitmap_git, object,
936 name);
937
938 bitmap_set(data->base, bitmap_pos);
939 }
940
941 static void show_commit(struct commit *commit, void *data)
942 {
943 }
944
945 static int add_to_include_set(struct bitmap_index *bitmap_git,
946 struct include_data *data,
947 struct commit *commit,
948 int bitmap_pos)
949 {
950 struct ewah_bitmap *partial;
951
952 if (data->seen && bitmap_get(data->seen, bitmap_pos))
953 return 0;
954
955 if (bitmap_get(data->base, bitmap_pos))
956 return 0;
957
958 partial = bitmap_for_commit(bitmap_git, commit);
959 if (partial) {
960 bitmap_or_ewah(data->base, partial);
961 return 0;
962 }
963
964 bitmap_set(data->base, bitmap_pos);
965 return 1;
966 }
967
968 static int should_include(struct commit *commit, void *_data)
969 {
970 struct include_data *data = _data;
971 int bitmap_pos;
972
973 bitmap_pos = bitmap_position(data->bitmap_git, &commit->object.oid);
974 if (bitmap_pos < 0)
975 bitmap_pos = ext_index_add_object(data->bitmap_git,
976 (struct object *)commit,
977 NULL);
978
979 if (!add_to_include_set(data->bitmap_git, data, commit, bitmap_pos)) {
980 struct commit_list *parent = commit->parents;
981
982 while (parent) {
983 parent->item->object.flags |= SEEN;
984 parent = parent->next;
985 }
986
987 return 0;
988 }
989
990 return 1;
991 }
992
993 static int should_include_obj(struct object *obj, void *_data)
994 {
995 struct include_data *data = _data;
996 int bitmap_pos;
997
998 bitmap_pos = bitmap_position(data->bitmap_git, &obj->oid);
999 if (bitmap_pos < 0)
1000 return 1;
1001 if ((data->seen && bitmap_get(data->seen, bitmap_pos)) ||
1002 bitmap_get(data->base, bitmap_pos)) {
1003 obj->flags |= SEEN;
1004 return 0;
1005 }
1006 return 1;
1007 }
1008
1009 static int add_commit_to_bitmap(struct bitmap_index *bitmap_git,
1010 struct bitmap **base,
1011 struct commit *commit)
1012 {
1013 struct ewah_bitmap *or_with = bitmap_for_commit(bitmap_git, commit);
1014
1015 if (!or_with)
1016 return 0;
1017
1018 if (!*base)
1019 *base = ewah_to_bitmap(or_with);
1020 else
1021 bitmap_or_ewah(*base, or_with);
1022
1023 return 1;
1024 }
1025
1026 static struct bitmap *find_objects(struct bitmap_index *bitmap_git,
1027 struct rev_info *revs,
1028 struct object_list *roots,
1029 struct bitmap *seen)
1030 {
1031 struct bitmap *base = NULL;
1032 int needs_walk = 0;
1033
1034 struct object_list *not_mapped = NULL;
1035
1036 /*
1037 * Go through all the roots for the walk. The ones that have bitmaps
1038 * on the bitmap index will be `or`ed together to form an initial
1039 * global reachability analysis.
1040 *
1041 * The ones without bitmaps in the index will be stored in the
1042 * `not_mapped_list` for further processing.
1043 */
1044 while (roots) {
1045 struct object *object = roots->item;
1046 roots = roots->next;
1047
1048 if (object->type == OBJ_COMMIT &&
1049 add_commit_to_bitmap(bitmap_git, &base, (struct commit *)object)) {
1050 object->flags |= SEEN;
1051 continue;
1052 }
1053
1054 object_list_insert(object, &not_mapped);
1055 }
1056
1057 /*
1058 * Best case scenario: We found bitmaps for all the roots,
1059 * so the resulting `or` bitmap has the full reachability analysis
1060 */
1061 if (!not_mapped)
1062 return base;
1063
1064 roots = not_mapped;
1065
1066 /*
1067 * Let's iterate through all the roots that don't have bitmaps to
1068 * check if we can determine them to be reachable from the existing
1069 * global bitmap.
1070 *
1071 * If we cannot find them in the existing global bitmap, we'll need
1072 * to push them to an actual walk and run it until we can confirm
1073 * they are reachable
1074 */
1075 while (roots) {
1076 struct object *object = roots->item;
1077 int pos;
1078
1079 roots = roots->next;
1080 pos = bitmap_position(bitmap_git, &object->oid);
1081
1082 if (pos < 0 || base == NULL || !bitmap_get(base, pos)) {
1083 object->flags &= ~UNINTERESTING;
1084 add_pending_object(revs, object, "");
1085 needs_walk = 1;
1086 } else {
1087 object->flags |= SEEN;
1088 }
1089 }
1090
1091 if (needs_walk) {
1092 struct include_data incdata;
1093 struct bitmap_show_data show_data;
1094
1095 if (!base)
1096 base = bitmap_new();
1097
1098 incdata.bitmap_git = bitmap_git;
1099 incdata.base = base;
1100 incdata.seen = seen;
1101
1102 revs->include_check = should_include;
1103 revs->include_check_obj = should_include_obj;
1104 revs->include_check_data = &incdata;
1105
1106 if (prepare_revision_walk(revs))
1107 die(_("revision walk setup failed"));
1108
1109 show_data.bitmap_git = bitmap_git;
1110 show_data.base = base;
1111
1112 traverse_commit_list(revs,
1113 show_commit, show_object,
1114 &show_data);
1115
1116 revs->include_check = NULL;
1117 revs->include_check_obj = NULL;
1118 revs->include_check_data = NULL;
1119 }
1120
1121 return base;
1122 }
1123
1124 static void show_extended_objects(struct bitmap_index *bitmap_git,
1125 struct rev_info *revs,
1126 show_reachable_fn show_reach)
1127 {
1128 struct bitmap *objects = bitmap_git->result;
1129 struct eindex *eindex = &bitmap_git->ext_index;
1130 uint32_t i;
1131
1132 for (i = 0; i < eindex->count; ++i) {
1133 struct object *obj;
1134
1135 if (!bitmap_get(objects, bitmap_num_objects(bitmap_git) + i))
1136 continue;
1137
1138 obj = eindex->objects[i];
1139 if ((obj->type == OBJ_BLOB && !revs->blob_objects) ||
1140 (obj->type == OBJ_TREE && !revs->tree_objects) ||
1141 (obj->type == OBJ_TAG && !revs->tag_objects))
1142 continue;
1143
1144 show_reach(&obj->oid, obj->type, 0, eindex->hashes[i], NULL, 0);
1145 }
1146 }
1147
1148 static void init_type_iterator(struct ewah_iterator *it,
1149 struct bitmap_index *bitmap_git,
1150 enum object_type type)
1151 {
1152 switch (type) {
1153 case OBJ_COMMIT:
1154 ewah_iterator_init(it, bitmap_git->commits);
1155 break;
1156
1157 case OBJ_TREE:
1158 ewah_iterator_init(it, bitmap_git->trees);
1159 break;
1160
1161 case OBJ_BLOB:
1162 ewah_iterator_init(it, bitmap_git->blobs);
1163 break;
1164
1165 case OBJ_TAG:
1166 ewah_iterator_init(it, bitmap_git->tags);
1167 break;
1168
1169 default:
1170 BUG("object type %d not stored by bitmap type index", type);
1171 break;
1172 }
1173 }
1174
1175 static void show_objects_for_type(
1176 struct bitmap_index *bitmap_git,
1177 enum object_type object_type,
1178 show_reachable_fn show_reach)
1179 {
1180 size_t i = 0;
1181 uint32_t offset;
1182
1183 struct ewah_iterator it;
1184 eword_t filter;
1185
1186 struct bitmap *objects = bitmap_git->result;
1187
1188 init_type_iterator(&it, bitmap_git, object_type);
1189
1190 for (i = 0; i < objects->word_alloc &&
1191 ewah_iterator_next(&filter, &it); i++) {
1192 eword_t word = objects->words[i] & filter;
1193 size_t pos = (i * BITS_IN_EWORD);
1194
1195 if (!word)
1196 continue;
1197
1198 for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
1199 struct packed_git *pack;
1200 struct object_id oid;
1201 uint32_t hash = 0, index_pos;
1202 off_t ofs;
1203
1204 if ((word >> offset) == 0)
1205 break;
1206
1207 offset += ewah_bit_ctz64(word >> offset);
1208
1209 if (bitmap_is_midx(bitmap_git)) {
1210 struct multi_pack_index *m = bitmap_git->midx;
1211 uint32_t pack_id;
1212
1213 index_pos = pack_pos_to_midx(m, pos + offset);
1214 ofs = nth_midxed_offset(m, index_pos);
1215 nth_midxed_object_oid(&oid, m, index_pos);
1216
1217 pack_id = nth_midxed_pack_int_id(m, index_pos);
1218 pack = bitmap_git->midx->packs[pack_id];
1219 } else {
1220 index_pos = pack_pos_to_index(bitmap_git->pack, pos + offset);
1221 ofs = pack_pos_to_offset(bitmap_git->pack, pos + offset);
1222 nth_bitmap_object_oid(bitmap_git, &oid, index_pos);
1223
1224 pack = bitmap_git->pack;
1225 }
1226
1227 if (bitmap_git->hashes)
1228 hash = get_be32(bitmap_git->hashes + index_pos);
1229
1230 show_reach(&oid, object_type, 0, hash, pack, ofs);
1231 }
1232 }
1233 }
1234
1235 static int in_bitmapped_pack(struct bitmap_index *bitmap_git,
1236 struct object_list *roots)
1237 {
1238 while (roots) {
1239 struct object *object = roots->item;
1240 roots = roots->next;
1241
1242 if (bitmap_is_midx(bitmap_git)) {
1243 if (bsearch_midx(&object->oid, bitmap_git->midx, NULL))
1244 return 1;
1245 } else {
1246 if (find_pack_entry_one(object->oid.hash, bitmap_git->pack) > 0)
1247 return 1;
1248 }
1249 }
1250
1251 return 0;
1252 }
1253
1254 static struct bitmap *find_tip_objects(struct bitmap_index *bitmap_git,
1255 struct object_list *tip_objects,
1256 enum object_type type)
1257 {
1258 struct bitmap *result = bitmap_new();
1259 struct object_list *p;
1260
1261 for (p = tip_objects; p; p = p->next) {
1262 int pos;
1263
1264 if (p->item->type != type)
1265 continue;
1266
1267 pos = bitmap_position(bitmap_git, &p->item->oid);
1268 if (pos < 0)
1269 continue;
1270
1271 bitmap_set(result, pos);
1272 }
1273
1274 return result;
1275 }
1276
1277 static void filter_bitmap_exclude_type(struct bitmap_index *bitmap_git,
1278 struct object_list *tip_objects,
1279 struct bitmap *to_filter,
1280 enum object_type type)
1281 {
1282 struct eindex *eindex = &bitmap_git->ext_index;
1283 struct bitmap *tips;
1284 struct ewah_iterator it;
1285 eword_t mask;
1286 uint32_t i;
1287
1288 /*
1289 * The non-bitmap version of this filter never removes
1290 * objects which the other side specifically asked for,
1291 * so we must match that behavior.
1292 */
1293 tips = find_tip_objects(bitmap_git, tip_objects, type);
1294
1295 /*
1296 * We can use the type-level bitmap for 'type' to work in whole
1297 * words for the objects that are actually in the bitmapped
1298 * packfile.
1299 */
1300 for (i = 0, init_type_iterator(&it, bitmap_git, type);
1301 i < to_filter->word_alloc && ewah_iterator_next(&mask, &it);
1302 i++) {
1303 if (i < tips->word_alloc)
1304 mask &= ~tips->words[i];
1305 to_filter->words[i] &= ~mask;
1306 }
1307
1308 /*
1309 * Clear any objects that weren't in the packfile (and so would
1310 * not have been caught by the loop above. We'll have to check
1311 * them individually.
1312 */
1313 for (i = 0; i < eindex->count; i++) {
1314 uint32_t pos = i + bitmap_num_objects(bitmap_git);
1315 if (eindex->objects[i]->type == type &&
1316 bitmap_get(to_filter, pos) &&
1317 !bitmap_get(tips, pos))
1318 bitmap_unset(to_filter, pos);
1319 }
1320
1321 bitmap_free(tips);
1322 }
1323
1324 static void filter_bitmap_blob_none(struct bitmap_index *bitmap_git,
1325 struct object_list *tip_objects,
1326 struct bitmap *to_filter)
1327 {
1328 filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
1329 OBJ_BLOB);
1330 }
1331
1332 static unsigned long get_size_by_pos(struct bitmap_index *bitmap_git,
1333 uint32_t pos)
1334 {
1335 unsigned long size;
1336 struct object_info oi = OBJECT_INFO_INIT;
1337
1338 oi.sizep = &size;
1339
1340 if (pos < bitmap_num_objects(bitmap_git)) {
1341 struct packed_git *pack;
1342 off_t ofs;
1343
1344 if (bitmap_is_midx(bitmap_git)) {
1345 uint32_t midx_pos = pack_pos_to_midx(bitmap_git->midx, pos);
1346 uint32_t pack_id = nth_midxed_pack_int_id(bitmap_git->midx, midx_pos);
1347
1348 pack = bitmap_git->midx->packs[pack_id];
1349 ofs = nth_midxed_offset(bitmap_git->midx, midx_pos);
1350 } else {
1351 pack = bitmap_git->pack;
1352 ofs = pack_pos_to_offset(pack, pos);
1353 }
1354
1355 if (packed_object_info(the_repository, pack, ofs, &oi) < 0) {
1356 struct object_id oid;
1357 nth_bitmap_object_oid(bitmap_git, &oid,
1358 pack_pos_to_index(pack, pos));
1359 die(_("unable to get size of %s"), oid_to_hex(&oid));
1360 }
1361 } else {
1362 struct eindex *eindex = &bitmap_git->ext_index;
1363 struct object *obj = eindex->objects[pos - bitmap_num_objects(bitmap_git)];
1364 if (oid_object_info_extended(the_repository, &obj->oid, &oi, 0) < 0)
1365 die(_("unable to get size of %s"), oid_to_hex(&obj->oid));
1366 }
1367
1368 return size;
1369 }
1370
1371 static void filter_bitmap_blob_limit(struct bitmap_index *bitmap_git,
1372 struct object_list *tip_objects,
1373 struct bitmap *to_filter,
1374 unsigned long limit)
1375 {
1376 struct eindex *eindex = &bitmap_git->ext_index;
1377 struct bitmap *tips;
1378 struct ewah_iterator it;
1379 eword_t mask;
1380 uint32_t i;
1381
1382 tips = find_tip_objects(bitmap_git, tip_objects, OBJ_BLOB);
1383
1384 for (i = 0, init_type_iterator(&it, bitmap_git, OBJ_BLOB);
1385 i < to_filter->word_alloc && ewah_iterator_next(&mask, &it);
1386 i++) {
1387 eword_t word = to_filter->words[i] & mask;
1388 unsigned offset;
1389
1390 for (offset = 0; offset < BITS_IN_EWORD; offset++) {
1391 uint32_t pos;
1392
1393 if ((word >> offset) == 0)
1394 break;
1395 offset += ewah_bit_ctz64(word >> offset);
1396 pos = i * BITS_IN_EWORD + offset;
1397
1398 if (!bitmap_get(tips, pos) &&
1399 get_size_by_pos(bitmap_git, pos) >= limit)
1400 bitmap_unset(to_filter, pos);
1401 }
1402 }
1403
1404 for (i = 0; i < eindex->count; i++) {
1405 uint32_t pos = i + bitmap_num_objects(bitmap_git);
1406 if (eindex->objects[i]->type == OBJ_BLOB &&
1407 bitmap_get(to_filter, pos) &&
1408 !bitmap_get(tips, pos) &&
1409 get_size_by_pos(bitmap_git, pos) >= limit)
1410 bitmap_unset(to_filter, pos);
1411 }
1412
1413 bitmap_free(tips);
1414 }
1415
1416 static void filter_bitmap_tree_depth(struct bitmap_index *bitmap_git,
1417 struct object_list *tip_objects,
1418 struct bitmap *to_filter,
1419 unsigned long limit)
1420 {
1421 if (limit)
1422 BUG("filter_bitmap_tree_depth given non-zero limit");
1423
1424 filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
1425 OBJ_TREE);
1426 filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
1427 OBJ_BLOB);
1428 }
1429
1430 static void filter_bitmap_object_type(struct bitmap_index *bitmap_git,
1431 struct object_list *tip_objects,
1432 struct bitmap *to_filter,
1433 enum object_type object_type)
1434 {
1435 if (object_type < OBJ_COMMIT || object_type > OBJ_TAG)
1436 BUG("filter_bitmap_object_type given invalid object");
1437
1438 if (object_type != OBJ_TAG)
1439 filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_TAG);
1440 if (object_type != OBJ_COMMIT)
1441 filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_COMMIT);
1442 if (object_type != OBJ_TREE)
1443 filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_TREE);
1444 if (object_type != OBJ_BLOB)
1445 filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_BLOB);
1446 }
1447
1448 static int filter_bitmap(struct bitmap_index *bitmap_git,
1449 struct object_list *tip_objects,
1450 struct bitmap *to_filter,
1451 struct list_objects_filter_options *filter)
1452 {
1453 if (!filter || filter->choice == LOFC_DISABLED)
1454 return 0;
1455
1456 if (filter->choice == LOFC_BLOB_NONE) {
1457 if (bitmap_git)
1458 filter_bitmap_blob_none(bitmap_git, tip_objects,
1459 to_filter);
1460 return 0;
1461 }
1462
1463 if (filter->choice == LOFC_BLOB_LIMIT) {
1464 if (bitmap_git)
1465 filter_bitmap_blob_limit(bitmap_git, tip_objects,
1466 to_filter,
1467 filter->blob_limit_value);
1468 return 0;
1469 }
1470
1471 if (filter->choice == LOFC_TREE_DEPTH &&
1472 filter->tree_exclude_depth == 0) {
1473 if (bitmap_git)
1474 filter_bitmap_tree_depth(bitmap_git, tip_objects,
1475 to_filter,
1476 filter->tree_exclude_depth);
1477 return 0;
1478 }
1479
1480 if (filter->choice == LOFC_OBJECT_TYPE) {
1481 if (bitmap_git)
1482 filter_bitmap_object_type(bitmap_git, tip_objects,
1483 to_filter,
1484 filter->object_type);
1485 return 0;
1486 }
1487
1488 if (filter->choice == LOFC_COMBINE) {
1489 int i;
1490 for (i = 0; i < filter->sub_nr; i++) {
1491 if (filter_bitmap(bitmap_git, tip_objects, to_filter,
1492 &filter->sub[i]) < 0)
1493 return -1;
1494 }
1495 return 0;
1496 }
1497
1498 /* filter choice not handled */
1499 return -1;
1500 }
1501
1502 static int can_filter_bitmap(struct list_objects_filter_options *filter)
1503 {
1504 return !filter_bitmap(NULL, NULL, NULL, filter);
1505 }
1506
1507 struct bitmap_index *prepare_bitmap_walk(struct rev_info *revs,
1508 int filter_provided_objects)
1509 {
1510 unsigned int i;
1511
1512 struct object_list *wants = NULL;
1513 struct object_list *haves = NULL;
1514
1515 struct bitmap *wants_bitmap = NULL;
1516 struct bitmap *haves_bitmap = NULL;
1517
1518 struct bitmap_index *bitmap_git;
1519
1520 /*
1521 * We can't do pathspec limiting with bitmaps, because we don't know
1522 * which commits are associated with which object changes (let alone
1523 * even which objects are associated with which paths).
1524 */
1525 if (revs->prune)
1526 return NULL;
1527
1528 if (!can_filter_bitmap(&revs->filter))
1529 return NULL;
1530
1531 /* try to open a bitmapped pack, but don't parse it yet
1532 * because we may not need to use it */
1533 CALLOC_ARRAY(bitmap_git, 1);
1534 if (open_bitmap(revs->repo, bitmap_git) < 0)
1535 goto cleanup;
1536
1537 for (i = 0; i < revs->pending.nr; ++i) {
1538 struct object *object = revs->pending.objects[i].item;
1539
1540 if (object->type == OBJ_NONE)
1541 parse_object_or_die(&object->oid, NULL);
1542
1543 while (object->type == OBJ_TAG) {
1544 struct tag *tag = (struct tag *) object;
1545
1546 if (object->flags & UNINTERESTING)
1547 object_list_insert(object, &haves);
1548 else
1549 object_list_insert(object, &wants);
1550
1551 object = parse_object_or_die(get_tagged_oid(tag), NULL);
1552 object->flags |= (tag->object.flags & UNINTERESTING);
1553 }
1554
1555 if (object->flags & UNINTERESTING)
1556 object_list_insert(object, &haves);
1557 else
1558 object_list_insert(object, &wants);
1559 }
1560
1561 /*
1562 * if we have a HAVES list, but none of those haves is contained
1563 * in the packfile that has a bitmap, we don't have anything to
1564 * optimize here
1565 */
1566 if (haves && !in_bitmapped_pack(bitmap_git, haves))
1567 goto cleanup;
1568
1569 /* if we don't want anything, we're done here */
1570 if (!wants)
1571 goto cleanup;
1572
1573 /*
1574 * now we're going to use bitmaps, so load the actual bitmap entries
1575 * from disk. this is the point of no return; after this the rev_list
1576 * becomes invalidated and we must perform the revwalk through bitmaps
1577 */
1578 if (load_bitmap(bitmap_git) < 0)
1579 goto cleanup;
1580
1581 object_array_clear(&revs->pending);
1582
1583 if (haves) {
1584 revs->ignore_missing_links = 1;
1585 haves_bitmap = find_objects(bitmap_git, revs, haves, NULL);
1586 reset_revision_walk();
1587 revs->ignore_missing_links = 0;
1588
1589 if (!haves_bitmap)
1590 BUG("failed to perform bitmap walk");
1591 }
1592
1593 wants_bitmap = find_objects(bitmap_git, revs, wants, haves_bitmap);
1594
1595 if (!wants_bitmap)
1596 BUG("failed to perform bitmap walk");
1597
1598 if (haves_bitmap)
1599 bitmap_and_not(wants_bitmap, haves_bitmap);
1600
1601 filter_bitmap(bitmap_git,
1602 (revs->filter.choice && filter_provided_objects) ? NULL : wants,
1603 wants_bitmap,
1604 &revs->filter);
1605
1606 bitmap_git->result = wants_bitmap;
1607 bitmap_git->haves = haves_bitmap;
1608
1609 object_list_free(&wants);
1610 object_list_free(&haves);
1611
1612 return bitmap_git;
1613
1614 cleanup:
1615 free_bitmap_index(bitmap_git);
1616 object_list_free(&wants);
1617 object_list_free(&haves);
1618 return NULL;
1619 }
1620
1621 /*
1622 * -1 means "stop trying further objects"; 0 means we may or may not have
1623 * reused, but you can keep feeding bits.
1624 */
1625 static int try_partial_reuse(struct packed_git *pack,
1626 size_t pos,
1627 struct bitmap *reuse,
1628 struct pack_window **w_curs)
1629 {
1630 off_t offset, delta_obj_offset;
1631 enum object_type type;
1632 unsigned long size;
1633
1634 /*
1635 * try_partial_reuse() is called either on (a) objects in the
1636 * bitmapped pack (in the case of a single-pack bitmap) or (b)
1637 * objects in the preferred pack of a multi-pack bitmap.
1638 * Importantly, the latter can pretend as if only a single pack
1639 * exists because:
1640 *
1641 * - The first pack->num_objects bits of a MIDX bitmap are
1642 * reserved for the preferred pack, and
1643 *
1644 * - Ties due to duplicate objects are always resolved in
1645 * favor of the preferred pack.
1646 *
1647 * Therefore we do not need to ever ask the MIDX for its copy of
1648 * an object by OID, since it will always select it from the
1649 * preferred pack. Likewise, the selected copy of the base
1650 * object for any deltas will reside in the same pack.
1651 *
1652 * This means that we can reuse pos when looking up the bit in
1653 * the reuse bitmap, too, since bits corresponding to the
1654 * preferred pack precede all bits from other packs.
1655 */
1656
1657 if (pos >= pack->num_objects)
1658 return -1; /* not actually in the pack or MIDX preferred pack */
1659
1660 offset = delta_obj_offset = pack_pos_to_offset(pack, pos);
1661 type = unpack_object_header(pack, w_curs, &offset, &size);
1662 if (type < 0)
1663 return -1; /* broken packfile, punt */
1664
1665 if (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA) {
1666 off_t base_offset;
1667 uint32_t base_pos;
1668
1669 /*
1670 * Find the position of the base object so we can look it up
1671 * in our bitmaps. If we can't come up with an offset, or if
1672 * that offset is not in the revidx, the pack is corrupt.
1673 * There's nothing we can do, so just punt on this object,
1674 * and the normal slow path will complain about it in
1675 * more detail.
1676 */
1677 base_offset = get_delta_base(pack, w_curs, &offset, type,
1678 delta_obj_offset);
1679 if (!base_offset)
1680 return 0;
1681 if (offset_to_pack_pos(pack, base_offset, &base_pos) < 0)
1682 return 0;
1683
1684 /*
1685 * We assume delta dependencies always point backwards. This
1686 * lets us do a single pass, and is basically always true
1687 * due to the way OFS_DELTAs work. You would not typically
1688 * find REF_DELTA in a bitmapped pack, since we only bitmap
1689 * packs we write fresh, and OFS_DELTA is the default). But
1690 * let's double check to make sure the pack wasn't written with
1691 * odd parameters.
1692 */
1693 if (base_pos >= pos)
1694 return 0;
1695
1696 /*
1697 * And finally, if we're not sending the base as part of our
1698 * reuse chunk, then don't send this object either. The base
1699 * would come after us, along with other objects not
1700 * necessarily in the pack, which means we'd need to convert
1701 * to REF_DELTA on the fly. Better to just let the normal
1702 * object_entry code path handle it.
1703 */
1704 if (!bitmap_get(reuse, base_pos))
1705 return 0;
1706 }
1707
1708 /*
1709 * If we got here, then the object is OK to reuse. Mark it.
1710 */
1711 bitmap_set(reuse, pos);
1712 return 0;
1713 }
1714
1715 uint32_t midx_preferred_pack(struct bitmap_index *bitmap_git)
1716 {
1717 struct multi_pack_index *m = bitmap_git->midx;
1718 if (!m)
1719 BUG("midx_preferred_pack: requires non-empty MIDX");
1720 return nth_midxed_pack_int_id(m, pack_pos_to_midx(bitmap_git->midx, 0));
1721 }
1722
1723 int reuse_partial_packfile_from_bitmap(struct bitmap_index *bitmap_git,
1724 struct packed_git **packfile_out,
1725 uint32_t *entries,
1726 struct bitmap **reuse_out)
1727 {
1728 struct packed_git *pack;
1729 struct bitmap *result = bitmap_git->result;
1730 struct bitmap *reuse;
1731 struct pack_window *w_curs = NULL;
1732 size_t i = 0;
1733 uint32_t offset;
1734 uint32_t objects_nr;
1735
1736 assert(result);
1737
1738 load_reverse_index(bitmap_git);
1739
1740 if (bitmap_is_midx(bitmap_git))
1741 pack = bitmap_git->midx->packs[midx_preferred_pack(bitmap_git)];
1742 else
1743 pack = bitmap_git->pack;
1744 objects_nr = pack->num_objects;
1745
1746 while (i < result->word_alloc && result->words[i] == (eword_t)~0)
1747 i++;
1748
1749 /*
1750 * Don't mark objects not in the packfile or preferred pack. This bitmap
1751 * marks objects eligible for reuse, but the pack-reuse code only
1752 * understands how to reuse a single pack. Since the preferred pack is
1753 * guaranteed to have all bases for its deltas (in a multi-pack bitmap),
1754 * we use it instead of another pack. In single-pack bitmaps, the choice
1755 * is made for us.
1756 */
1757 if (i > objects_nr / BITS_IN_EWORD)
1758 i = objects_nr / BITS_IN_EWORD;
1759
1760 reuse = bitmap_word_alloc(i);
1761 memset(reuse->words, 0xFF, i * sizeof(eword_t));
1762
1763 for (; i < result->word_alloc; ++i) {
1764 eword_t word = result->words[i];
1765 size_t pos = (i * BITS_IN_EWORD);
1766
1767 for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
1768 if ((word >> offset) == 0)
1769 break;
1770
1771 offset += ewah_bit_ctz64(word >> offset);
1772 if (try_partial_reuse(pack, pos + offset,
1773 reuse, &w_curs) < 0) {
1774 /*
1775 * try_partial_reuse indicated we couldn't reuse
1776 * any bits, so there is no point in trying more
1777 * bits in the current word, or any other words
1778 * in result.
1779 *
1780 * Jump out of both loops to avoid future
1781 * unnecessary calls to try_partial_reuse.
1782 */
1783 goto done;
1784 }
1785 }
1786 }
1787
1788 done:
1789 unuse_pack(&w_curs);
1790
1791 *entries = bitmap_popcount(reuse);
1792 if (!*entries) {
1793 bitmap_free(reuse);
1794 return -1;
1795 }
1796
1797 /*
1798 * Drop any reused objects from the result, since they will not
1799 * need to be handled separately.
1800 */
1801 bitmap_and_not(result, reuse);
1802 *packfile_out = pack;
1803 *reuse_out = reuse;
1804 return 0;
1805 }
1806
1807 int bitmap_walk_contains(struct bitmap_index *bitmap_git,
1808 struct bitmap *bitmap, const struct object_id *oid)
1809 {
1810 int idx;
1811
1812 if (!bitmap)
1813 return 0;
1814
1815 idx = bitmap_position(bitmap_git, oid);
1816 return idx >= 0 && bitmap_get(bitmap, idx);
1817 }
1818
1819 void traverse_bitmap_commit_list(struct bitmap_index *bitmap_git,
1820 struct rev_info *revs,
1821 show_reachable_fn show_reachable)
1822 {
1823 assert(bitmap_git->result);
1824
1825 show_objects_for_type(bitmap_git, OBJ_COMMIT, show_reachable);
1826 if (revs->tree_objects)
1827 show_objects_for_type(bitmap_git, OBJ_TREE, show_reachable);
1828 if (revs->blob_objects)
1829 show_objects_for_type(bitmap_git, OBJ_BLOB, show_reachable);
1830 if (revs->tag_objects)
1831 show_objects_for_type(bitmap_git, OBJ_TAG, show_reachable);
1832
1833 show_extended_objects(bitmap_git, revs, show_reachable);
1834 }
1835
1836 static uint32_t count_object_type(struct bitmap_index *bitmap_git,
1837 enum object_type type)
1838 {
1839 struct bitmap *objects = bitmap_git->result;
1840 struct eindex *eindex = &bitmap_git->ext_index;
1841
1842 uint32_t i = 0, count = 0;
1843 struct ewah_iterator it;
1844 eword_t filter;
1845
1846 init_type_iterator(&it, bitmap_git, type);
1847
1848 while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) {
1849 eword_t word = objects->words[i++] & filter;
1850 count += ewah_bit_popcount64(word);
1851 }
1852
1853 for (i = 0; i < eindex->count; ++i) {
1854 if (eindex->objects[i]->type == type &&
1855 bitmap_get(objects, bitmap_num_objects(bitmap_git) + i))
1856 count++;
1857 }
1858
1859 return count;
1860 }
1861
1862 void count_bitmap_commit_list(struct bitmap_index *bitmap_git,
1863 uint32_t *commits, uint32_t *trees,
1864 uint32_t *blobs, uint32_t *tags)
1865 {
1866 assert(bitmap_git->result);
1867
1868 if (commits)
1869 *commits = count_object_type(bitmap_git, OBJ_COMMIT);
1870
1871 if (trees)
1872 *trees = count_object_type(bitmap_git, OBJ_TREE);
1873
1874 if (blobs)
1875 *blobs = count_object_type(bitmap_git, OBJ_BLOB);
1876
1877 if (tags)
1878 *tags = count_object_type(bitmap_git, OBJ_TAG);
1879 }
1880
1881 struct bitmap_test_data {
1882 struct bitmap_index *bitmap_git;
1883 struct bitmap *base;
1884 struct bitmap *commits;
1885 struct bitmap *trees;
1886 struct bitmap *blobs;
1887 struct bitmap *tags;
1888 struct progress *prg;
1889 size_t seen;
1890 };
1891
1892 static void test_bitmap_type(struct bitmap_test_data *tdata,
1893 struct object *obj, int pos)
1894 {
1895 enum object_type bitmap_type = OBJ_NONE;
1896 int bitmaps_nr = 0;
1897
1898 if (bitmap_get(tdata->commits, pos)) {
1899 bitmap_type = OBJ_COMMIT;
1900 bitmaps_nr++;
1901 }
1902 if (bitmap_get(tdata->trees, pos)) {
1903 bitmap_type = OBJ_TREE;
1904 bitmaps_nr++;
1905 }
1906 if (bitmap_get(tdata->blobs, pos)) {
1907 bitmap_type = OBJ_BLOB;
1908 bitmaps_nr++;
1909 }
1910 if (bitmap_get(tdata->tags, pos)) {
1911 bitmap_type = OBJ_TAG;
1912 bitmaps_nr++;
1913 }
1914
1915 if (bitmap_type == OBJ_NONE)
1916 die(_("object '%s' not found in type bitmaps"),
1917 oid_to_hex(&obj->oid));
1918
1919 if (bitmaps_nr > 1)
1920 die(_("object '%s' does not have a unique type"),
1921 oid_to_hex(&obj->oid));
1922
1923 if (bitmap_type != obj->type)
1924 die(_("object '%s': real type '%s', expected: '%s'"),
1925 oid_to_hex(&obj->oid),
1926 type_name(obj->type),
1927 type_name(bitmap_type));
1928 }
1929
1930 static void test_show_object(struct object *object, const char *name,
1931 void *data)
1932 {
1933 struct bitmap_test_data *tdata = data;
1934 int bitmap_pos;
1935
1936 bitmap_pos = bitmap_position(tdata->bitmap_git, &object->oid);
1937 if (bitmap_pos < 0)
1938 die(_("object not in bitmap: '%s'"), oid_to_hex(&object->oid));
1939 test_bitmap_type(tdata, object, bitmap_pos);
1940
1941 bitmap_set(tdata->base, bitmap_pos);
1942 display_progress(tdata->prg, ++tdata->seen);
1943 }
1944
1945 static void test_show_commit(struct commit *commit, void *data)
1946 {
1947 struct bitmap_test_data *tdata = data;
1948 int bitmap_pos;
1949
1950 bitmap_pos = bitmap_position(tdata->bitmap_git,
1951 &commit->object.oid);
1952 if (bitmap_pos < 0)
1953 die(_("object not in bitmap: '%s'"), oid_to_hex(&commit->object.oid));
1954 test_bitmap_type(tdata, &commit->object, bitmap_pos);
1955
1956 bitmap_set(tdata->base, bitmap_pos);
1957 display_progress(tdata->prg, ++tdata->seen);
1958 }
1959
1960 void test_bitmap_walk(struct rev_info *revs)
1961 {
1962 struct object *root;
1963 struct bitmap *result = NULL;
1964 size_t result_popcnt;
1965 struct bitmap_test_data tdata;
1966 struct bitmap_index *bitmap_git;
1967 struct ewah_bitmap *bm;
1968
1969 if (!(bitmap_git = prepare_bitmap_git(revs->repo)))
1970 die(_("failed to load bitmap indexes"));
1971
1972 if (revs->pending.nr != 1)
1973 die(_("you must specify exactly one commit to test"));
1974
1975 fprintf_ln(stderr, "Bitmap v%d test (%d entries%s)",
1976 bitmap_git->version,
1977 bitmap_git->entry_count,
1978 bitmap_git->table_lookup ? "" : " loaded");
1979
1980 root = revs->pending.objects[0].item;
1981 bm = bitmap_for_commit(bitmap_git, (struct commit *)root);
1982
1983 if (bm) {
1984 fprintf_ln(stderr, "Found bitmap for '%s'. %d bits / %08x checksum",
1985 oid_to_hex(&root->oid), (int)bm->bit_size, ewah_checksum(bm));
1986
1987 result = ewah_to_bitmap(bm);
1988 }
1989
1990 if (!result)
1991 die(_("commit '%s' doesn't have an indexed bitmap"), oid_to_hex(&root->oid));
1992
1993 revs->tag_objects = 1;
1994 revs->tree_objects = 1;
1995 revs->blob_objects = 1;
1996
1997 result_popcnt = bitmap_popcount(result);
1998
1999 if (prepare_revision_walk(revs))
2000 die(_("revision walk setup failed"));
2001
2002 tdata.bitmap_git = bitmap_git;
2003 tdata.base = bitmap_new();
2004 tdata.commits = ewah_to_bitmap(bitmap_git->commits);
2005 tdata.trees = ewah_to_bitmap(bitmap_git->trees);
2006 tdata.blobs = ewah_to_bitmap(bitmap_git->blobs);
2007 tdata.tags = ewah_to_bitmap(bitmap_git->tags);
2008 tdata.prg = start_progress("Verifying bitmap entries", result_popcnt);
2009 tdata.seen = 0;
2010
2011 traverse_commit_list(revs, &test_show_commit, &test_show_object, &tdata);
2012
2013 stop_progress(&tdata.prg);
2014
2015 if (bitmap_equals(result, tdata.base))
2016 fprintf_ln(stderr, "OK!");
2017 else
2018 die(_("mismatch in bitmap results"));
2019
2020 bitmap_free(result);
2021 bitmap_free(tdata.base);
2022 bitmap_free(tdata.commits);
2023 bitmap_free(tdata.trees);
2024 bitmap_free(tdata.blobs);
2025 bitmap_free(tdata.tags);
2026 free_bitmap_index(bitmap_git);
2027 }
2028
2029 int test_bitmap_commits(struct repository *r)
2030 {
2031 struct object_id oid;
2032 MAYBE_UNUSED void *value;
2033 struct bitmap_index *bitmap_git = prepare_bitmap_git(r);
2034
2035 if (!bitmap_git)
2036 die(_("failed to load bitmap indexes"));
2037
2038 /*
2039 * As this function is only used to print bitmap selected
2040 * commits, we don't have to read the commit table.
2041 */
2042 if (bitmap_git->table_lookup) {
2043 if (load_bitmap_entries_v1(bitmap_git) < 0)
2044 die(_("failed to load bitmap indexes"));
2045 }
2046
2047 kh_foreach(bitmap_git->bitmaps, oid, value, {
2048 printf_ln("%s", oid_to_hex(&oid));
2049 });
2050
2051 free_bitmap_index(bitmap_git);
2052
2053 return 0;
2054 }
2055
2056 int test_bitmap_hashes(struct repository *r)
2057 {
2058 struct bitmap_index *bitmap_git = prepare_bitmap_git(r);
2059 struct object_id oid;
2060 uint32_t i, index_pos;
2061
2062 if (!bitmap_git || !bitmap_git->hashes)
2063 goto cleanup;
2064
2065 for (i = 0; i < bitmap_num_objects(bitmap_git); i++) {
2066 if (bitmap_is_midx(bitmap_git))
2067 index_pos = pack_pos_to_midx(bitmap_git->midx, i);
2068 else
2069 index_pos = pack_pos_to_index(bitmap_git->pack, i);
2070
2071 nth_bitmap_object_oid(bitmap_git, &oid, index_pos);
2072
2073 printf_ln("%s %"PRIu32"",
2074 oid_to_hex(&oid), get_be32(bitmap_git->hashes + index_pos));
2075 }
2076
2077 cleanup:
2078 free_bitmap_index(bitmap_git);
2079
2080 return 0;
2081 }
2082
2083 int rebuild_bitmap(const uint32_t *reposition,
2084 struct ewah_bitmap *source,
2085 struct bitmap *dest)
2086 {
2087 uint32_t pos = 0;
2088 struct ewah_iterator it;
2089 eword_t word;
2090
2091 ewah_iterator_init(&it, source);
2092
2093 while (ewah_iterator_next(&word, &it)) {
2094 uint32_t offset, bit_pos;
2095
2096 for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
2097 if ((word >> offset) == 0)
2098 break;
2099
2100 offset += ewah_bit_ctz64(word >> offset);
2101
2102 bit_pos = reposition[pos + offset];
2103 if (bit_pos > 0)
2104 bitmap_set(dest, bit_pos - 1);
2105 else /* can't reuse, we don't have the object */
2106 return -1;
2107 }
2108
2109 pos += BITS_IN_EWORD;
2110 }
2111 return 0;
2112 }
2113
2114 uint32_t *create_bitmap_mapping(struct bitmap_index *bitmap_git,
2115 struct packing_data *mapping)
2116 {
2117 uint32_t i, num_objects;
2118 uint32_t *reposition;
2119
2120 if (!bitmap_is_midx(bitmap_git))
2121 load_reverse_index(bitmap_git);
2122 else if (load_midx_revindex(bitmap_git->midx) < 0)
2123 BUG("rebuild_existing_bitmaps: missing required rev-cache "
2124 "extension");
2125
2126 num_objects = bitmap_num_objects(bitmap_git);
2127 CALLOC_ARRAY(reposition, num_objects);
2128
2129 for (i = 0; i < num_objects; ++i) {
2130 struct object_id oid;
2131 struct object_entry *oe;
2132 uint32_t index_pos;
2133
2134 if (bitmap_is_midx(bitmap_git))
2135 index_pos = pack_pos_to_midx(bitmap_git->midx, i);
2136 else
2137 index_pos = pack_pos_to_index(bitmap_git->pack, i);
2138 nth_bitmap_object_oid(bitmap_git, &oid, index_pos);
2139 oe = packlist_find(mapping, &oid);
2140
2141 if (oe) {
2142 reposition[i] = oe_in_pack_pos(mapping, oe) + 1;
2143 if (bitmap_git->hashes && !oe->hash)
2144 oe->hash = get_be32(bitmap_git->hashes + index_pos);
2145 }
2146 }
2147
2148 return reposition;
2149 }
2150
2151 void free_bitmap_index(struct bitmap_index *b)
2152 {
2153 if (!b)
2154 return;
2155
2156 if (b->map)
2157 munmap(b->map, b->map_size);
2158 ewah_pool_free(b->commits);
2159 ewah_pool_free(b->trees);
2160 ewah_pool_free(b->blobs);
2161 ewah_pool_free(b->tags);
2162 if (b->bitmaps) {
2163 struct stored_bitmap *sb;
2164 kh_foreach_value(b->bitmaps, sb, {
2165 ewah_pool_free(sb->root);
2166 free(sb);
2167 });
2168 }
2169 kh_destroy_oid_map(b->bitmaps);
2170 free(b->ext_index.objects);
2171 free(b->ext_index.hashes);
2172 kh_destroy_oid_pos(b->ext_index.positions);
2173 bitmap_free(b->result);
2174 bitmap_free(b->haves);
2175 if (bitmap_is_midx(b)) {
2176 /*
2177 * Multi-pack bitmaps need to have resources associated with
2178 * their on-disk reverse indexes unmapped so that stale .rev and
2179 * .bitmap files can be removed.
2180 *
2181 * Unlike pack-based bitmaps, multi-pack bitmaps can be read and
2182 * written in the same 'git multi-pack-index write --bitmap'
2183 * process. Close resources so they can be removed safely on
2184 * platforms like Windows.
2185 */
2186 close_midx_revindex(b->midx);
2187 }
2188 free(b);
2189 }
2190
2191 int bitmap_has_oid_in_uninteresting(struct bitmap_index *bitmap_git,
2192 const struct object_id *oid)
2193 {
2194 return bitmap_git &&
2195 bitmap_walk_contains(bitmap_git, bitmap_git->haves, oid);
2196 }
2197
2198 static off_t get_disk_usage_for_type(struct bitmap_index *bitmap_git,
2199 enum object_type object_type)
2200 {
2201 struct bitmap *result = bitmap_git->result;
2202 off_t total = 0;
2203 struct ewah_iterator it;
2204 eword_t filter;
2205 size_t i;
2206
2207 init_type_iterator(&it, bitmap_git, object_type);
2208 for (i = 0; i < result->word_alloc &&
2209 ewah_iterator_next(&filter, &it); i++) {
2210 eword_t word = result->words[i] & filter;
2211 size_t base = (i * BITS_IN_EWORD);
2212 unsigned offset;
2213
2214 if (!word)
2215 continue;
2216
2217 for (offset = 0; offset < BITS_IN_EWORD; offset++) {
2218 if ((word >> offset) == 0)
2219 break;
2220
2221 offset += ewah_bit_ctz64(word >> offset);
2222
2223 if (bitmap_is_midx(bitmap_git)) {
2224 uint32_t pack_pos;
2225 uint32_t midx_pos = pack_pos_to_midx(bitmap_git->midx, base + offset);
2226 off_t offset = nth_midxed_offset(bitmap_git->midx, midx_pos);
2227
2228 uint32_t pack_id = nth_midxed_pack_int_id(bitmap_git->midx, midx_pos);
2229 struct packed_git *pack = bitmap_git->midx->packs[pack_id];
2230
2231 if (offset_to_pack_pos(pack, offset, &pack_pos) < 0) {
2232 struct object_id oid;
2233 nth_midxed_object_oid(&oid, bitmap_git->midx, midx_pos);
2234
2235 die(_("could not find '%s' in pack '%s' at offset %"PRIuMAX),
2236 oid_to_hex(&oid),
2237 pack->pack_name,
2238 (uintmax_t)offset);
2239 }
2240
2241 total += pack_pos_to_offset(pack, pack_pos + 1) - offset;
2242 } else {
2243 size_t pos = base + offset;
2244 total += pack_pos_to_offset(bitmap_git->pack, pos + 1) -
2245 pack_pos_to_offset(bitmap_git->pack, pos);
2246 }
2247 }
2248 }
2249
2250 return total;
2251 }
2252
2253 static off_t get_disk_usage_for_extended(struct bitmap_index *bitmap_git)
2254 {
2255 struct bitmap *result = bitmap_git->result;
2256 struct eindex *eindex = &bitmap_git->ext_index;
2257 off_t total = 0;
2258 struct object_info oi = OBJECT_INFO_INIT;
2259 off_t object_size;
2260 size_t i;
2261
2262 oi.disk_sizep = &object_size;
2263
2264 for (i = 0; i < eindex->count; i++) {
2265 struct object *obj = eindex->objects[i];
2266
2267 if (!bitmap_get(result, bitmap_num_objects(bitmap_git) + i))
2268 continue;
2269
2270 if (oid_object_info_extended(the_repository, &obj->oid, &oi, 0) < 0)
2271 die(_("unable to get disk usage of '%s'"),
2272 oid_to_hex(&obj->oid));
2273
2274 total += object_size;
2275 }
2276 return total;
2277 }
2278
2279 off_t get_disk_usage_from_bitmap(struct bitmap_index *bitmap_git,
2280 struct rev_info *revs)
2281 {
2282 off_t total = 0;
2283
2284 total += get_disk_usage_for_type(bitmap_git, OBJ_COMMIT);
2285 if (revs->tree_objects)
2286 total += get_disk_usage_for_type(bitmap_git, OBJ_TREE);
2287 if (revs->blob_objects)
2288 total += get_disk_usage_for_type(bitmap_git, OBJ_BLOB);
2289 if (revs->tag_objects)
2290 total += get_disk_usage_for_type(bitmap_git, OBJ_TAG);
2291
2292 total += get_disk_usage_for_extended(bitmap_git);
2293
2294 return total;
2295 }
2296
2297 int bitmap_is_midx(struct bitmap_index *bitmap_git)
2298 {
2299 return !!bitmap_git->midx;
2300 }
2301
2302 const struct string_list *bitmap_preferred_tips(struct repository *r)
2303 {
2304 return repo_config_get_value_multi(r, "pack.preferbitmaptips");
2305 }
2306
2307 int bitmap_is_preferred_refname(struct repository *r, const char *refname)
2308 {
2309 const struct string_list *preferred_tips = bitmap_preferred_tips(r);
2310 struct string_list_item *item;
2311
2312 if (!preferred_tips)
2313 return 0;
2314
2315 for_each_string_list_item(item, preferred_tips) {
2316 if (starts_with(refname, item->string))
2317 return 1;
2318 }
2319
2320 return 0;
2321 }
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