pack-bitmap.c · leroysheep/BookAlchemy

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1	#define DISABLE_SIGN_COMPARE_WARNINGS
2
3	#include "git-compat-util.h"
4	#include "commit.h"
5	#include "gettext.h"
6	#include "hex.h"
7	#include "strbuf.h"
8	#include "tag.h"
9	#include "diff.h"
10	#include "revision.h"
11	#include "progress.h"
12	#include "list-objects.h"
13	#include "pack.h"
14	#include "pack-bitmap.h"
15	#include "pack-revindex.h"
16	#include "pack-objects.h"
17	#include "packfile.h"
18	#include "repository.h"
19	#include "trace2.h"
20	#include "odb.h"
21	#include "list-objects-filter-options.h"
22	#include "midx.h"
23	#include "config.h"
24	#include "pseudo-merge.h"
25
26	/*
27	* An entry on the bitmap index, representing the bitmap for a given
28	* commit.
29	*/
30	struct stored_bitmap {
31	struct object_id oid;
32	struct ewah_bitmap *root;
33	struct stored_bitmap *xor;
34	size_t map_pos;
35	int flags;
36	};
37
38	/*
39	* The active bitmap index for a repository. By design, repositories only have
40	* a single bitmap index available (the index for the biggest packfile in
41	* the repository), since bitmap indexes need full closure.
42	*
43	* If there is more than one bitmap index available (e.g. because of alternates),
44	* the active bitmap index is the largest one.
45	*/
46	struct bitmap_index {
47	/*
48	* The pack or multi-pack index (MIDX) that this bitmap index belongs
49	* to.
50	*
51	* Exactly one of these must be non-NULL; this specifies the object
52	* order used to interpret this bitmap.
53	*/
54	struct packed_git *pack;
55	struct multi_pack_index *midx;
56
57	/*
58	* If using a multi-pack index chain, 'base' points to the
59	* bitmap index corresponding to this bitmap's midx->base_midx.
60	*
61	* base_nr indicates how many layers precede this one, and is
62	* zero when base is NULL.
63	*/
64	struct bitmap_index *base;
65	uint32_t base_nr;
66
67	/* mmapped buffer of the whole bitmap index */
68	unsigned char *map;
69	size_t map_size; /* size of the mmaped buffer */
70	size_t map_pos; /* current position when loading the index */
71
72	/*
73	* Type indexes.
74	*
75	* Each bitmap marks which objects in the packfile are of the given
76	* type. This provides type information when yielding the objects from
77	* the packfile during a walk, which allows for better delta bases.
78	*/
79	struct ewah_bitmap *commits;
80	struct ewah_bitmap *trees;
81	struct ewah_bitmap *blobs;
82	struct ewah_bitmap *tags;
83
84	/*
85	* Type index arrays when this bitmap is associated with an
86	* incremental multi-pack index chain.
87	*
88	* If n is the number of unique layers in the MIDX chain, then
89	* commits_all[n-1] is this structs 'commits' field,
90	* commits_all[n-2] is the commits field of this bitmap's
91	* 'base', and so on.
92	*
93	* When associated either with a non-incremental MIDX or a
94	* single packfile, these arrays each contain a single element.
95	*/
96	struct ewah_bitmap **commits_all;
97	struct ewah_bitmap **trees_all;
98	struct ewah_bitmap **blobs_all;
99	struct ewah_bitmap **tags_all;
100
101	/* Map from object ID -> `stored_bitmap` for all the bitmapped commits */
102	kh_oid_map_t *bitmaps;
103
104	/* Number of bitmapped commits */
105	uint32_t entry_count;
106
107	/* If not NULL, this is a name-hash cache pointing into map. */
108	uint32_t *hashes;
109
110	/* The checksum of the packfile or MIDX; points into map. */
111	const unsigned char *checksum;
112
113	/*
114	* If not NULL, this point into the commit table extension
115	* (within the memory mapped region `map`).
116	*/
117	unsigned char *table_lookup;
118
119	/* This contains the pseudo-merge cache within 'map' (if found). */
120	struct pseudo_merge_map pseudo_merges;
121
122	/*
123	* Extended index.
124	*
125	* When trying to perform bitmap operations with objects that are not
126	* packed in `pack`, these objects are added to this "fake index" and
127	* are assumed to appear at the end of the packfile for all operations
128	*/
129	struct eindex {
130	struct object **objects;
131	uint32_t *hashes;
132	uint32_t count, alloc;
133	kh_oid_pos_t *positions;
134	} ext_index;
135
136	/* Bitmap result of the last performed walk */
137	struct bitmap *result;
138
139	/* "have" bitmap from the last performed walk */
140	struct bitmap *haves;
141
142	/* Version of the bitmap index */
143	unsigned int version;
144	};
145
146	static int pseudo_merges_satisfied_nr;
147	static int pseudo_merges_cascades_nr;
148	static int existing_bitmaps_hits_nr;
149	static int existing_bitmaps_misses_nr;
150	static int roots_with_bitmaps_nr;
151	static int roots_without_bitmaps_nr;
152
153	static struct ewah_bitmap lookup_stored_bitmap(struct stored_bitmap st)
154	{
155	struct ewah_bitmap *parent;
156	struct ewah_bitmap *composed;
157
158	if (!st->xor)
159	return st->root;
160
161	composed = ewah_pool_new();
162	parent = lookup_stored_bitmap(st->xor);
163	ewah_xor(st->root, parent, composed);
164
165	ewah_pool_free(st->root);
166	st->root = composed;
167	st->xor = NULL;
168
169	return composed;
170	}
171
172	struct ewah_bitmap read_bitmap(const unsigned char map,
173	size_t map_size, size_t *map_pos)
174	{
175	struct ewah_bitmap *b = ewah_pool_new();
176
177	ssize_t bitmap_size = ewah_read_mmap(b, map + *map_pos,
178	map_size - *map_pos);
179
180	if (bitmap_size < 0) {
181	error(_("failed to load bitmap index (corrupted?)"));
182	ewah_pool_free(b);
183	return NULL;
184	}
185
186	*map_pos += bitmap_size;
187
188	return b;
189	}
190
191	/*
192	* Read a bitmap from the current read position on the mmaped
193	* index, and increase the read position accordingly
194	*/
195	static struct ewah_bitmap read_bitmap_1(struct bitmap_index index)
196	{
197	return read_bitmap(index->map, index->map_size, &index->map_pos);
198	}
199
200	static uint32_t bitmap_num_objects_total(struct bitmap_index *index)
201	{
202	if (index->midx) {
203	struct multi_pack_index *m = index->midx;
204	return m->num_objects + m->num_objects_in_base;
205	}
206	return index->pack->num_objects;
207	}
208
209	static uint32_t bitmap_num_objects(struct bitmap_index *index)
210	{
211	if (index->midx)
212	return index->midx->num_objects;
213	return index->pack->num_objects;
214	}
215
216	static uint32_t bitmap_name_hash(struct bitmap_index *index, uint32_t pos)
217	{
218	if (bitmap_is_midx(index)) {
219	while (index && pos < index->midx->num_objects_in_base) {
220	ASSERT(bitmap_is_midx(index));
221	index = index->base;
222	}
223
224	if (!index)
225	BUG("NULL base bitmap for object position: %"PRIu32, pos);
226
227	pos -= index->midx->num_objects_in_base;
228	if (pos >= index->midx->num_objects)
229	BUG("out-of-bounds midx bitmap object at %"PRIu32, pos);
230	}
231
232	if (!index->hashes)
233	return 0;
234
235	return get_be32(index->hashes + pos);
236	}
237
238	static struct repository bitmap_repo(struct bitmap_index bitmap_git)
239	{
240	if (bitmap_is_midx(bitmap_git))
241	return bitmap_git->midx->source->base.odb->repo;
242	return bitmap_git->pack->repo;
243	}
244
245	static int load_bitmap_header(struct bitmap_index *index)
246	{
247	struct bitmap_disk_header header = (void )index->map;
248	const struct git_hash_algo *hash_algo = bitmap_repo(index)->hash_algo;
249
250	size_t header_size = sizeof(*header) - GIT_MAX_RAWSZ + hash_algo->rawsz;
251
252	if (index->map_size < header_size + hash_algo->rawsz)
253	return error(_("corrupted bitmap index (too small)"));
254
255	if (memcmp(header->magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE)) != 0)
256	return error(_("corrupted bitmap index file (wrong header)"));
257
258	index->version = ntohs(header->version);
259	if (index->version != 1)
260	return error(_("unsupported version '%d' for bitmap index file"), index->version);
261
262	/* Parse known bitmap format options */
263	{
264	uint32_t flags = ntohs(header->options);
265	size_t cache_size = st_mult(bitmap_num_objects(index), sizeof(uint32_t));
266	unsigned char *index_end = index->map + index->map_size - hash_algo->rawsz;
267
268	if ((flags & BITMAP_OPT_FULL_DAG) == 0)
269	BUG("unsupported options for bitmap index file "
270	"(Git requires BITMAP_OPT_FULL_DAG)");
271
272	if (flags & BITMAP_OPT_HASH_CACHE) {
273	if (cache_size > index_end - index->map - header_size)
274	return error(_("corrupted bitmap index file (too short to fit hash cache)"));
275	index->hashes = (void *)(index_end - cache_size);
276	index_end -= cache_size;
277	}
278
279	if (flags & BITMAP_OPT_LOOKUP_TABLE) {
280	size_t table_size = st_mult(ntohl(header->entry_count),
281	BITMAP_LOOKUP_TABLE_TRIPLET_WIDTH);
282	if (table_size > index_end - index->map - header_size)
283	return error(_("corrupted bitmap index file (too short to fit lookup table)"));
284	if (git_env_bool("GIT_TEST_READ_COMMIT_TABLE", 1))
285	index->table_lookup = (void *)(index_end - table_size);
286	index_end -= table_size;
287	}
288
289	if (flags & BITMAP_OPT_PSEUDO_MERGES) {
290	unsigned char *pseudo_merge_ofs;
291	size_t table_size;
292	uint32_t i;
293
294	if (sizeof(table_size) > index_end - index->map - header_size)
295	return error(_("corrupted bitmap index file (too short to fit pseudo-merge table header)"));
296
297	table_size = get_be64(index_end - 8);
298	if (table_size > index_end - index->map - header_size)
299	return error(_("corrupted bitmap index file (too short to fit pseudo-merge table)"));
300
301	if (git_env_bool("GIT_TEST_USE_PSEUDO_MERGES", 1)) {
302	const unsigned char *ext = (index_end - table_size);
303
304	index->pseudo_merges.map = index->map;
305	index->pseudo_merges.map_size = index->map_size;
306	index->pseudo_merges.commits = ext + get_be64(index_end - 16);
307	index->pseudo_merges.commits_nr = get_be32(index_end - 20);
308	index->pseudo_merges.nr = get_be32(index_end - 24);
309
310	if (st_add(st_mult(index->pseudo_merges.nr,
311	sizeof(uint64_t)),
312	24) > table_size)
313	return error(_("corrupted bitmap index file, pseudo-merge table too short"));
314
315	CALLOC_ARRAY(index->pseudo_merges.v,
316	index->pseudo_merges.nr);
317
318	pseudo_merge_ofs = index_end - 24 -
319	(index->pseudo_merges.nr * sizeof(uint64_t));
320	for (i = 0; i < index->pseudo_merges.nr; i++) {
321	index->pseudo_merges.v[i].at = get_be64(pseudo_merge_ofs);
322	pseudo_merge_ofs += sizeof(uint64_t);
323	}
324	}
325
326	index_end -= table_size;
327	}
328	}
329
330	index->entry_count = ntohl(header->entry_count);
331	index->checksum = header->checksum;
332	index->map_pos += header_size;
333	return 0;
334	}
335
336	static struct stored_bitmap store_bitmap(struct bitmap_index index,
337	struct ewah_bitmap *root,
338	const struct object_id *oid,
339	struct stored_bitmap *xor_with,
340	int flags, size_t map_pos)
341	{
342	struct stored_bitmap *stored;
343	khiter_t hash_pos;
344	int ret;
345
346	stored = xmalloc(sizeof(struct stored_bitmap));
347	stored->map_pos = map_pos;
348	stored->root = root;
349	stored->xor = xor_with;
350	stored->flags = flags;
351	oidcpy(&stored->oid, oid);
352
353	hash_pos = kh_put_oid_map(index->bitmaps, stored->oid, &ret);
354
355	/*
356	* A 0 return code means the insertion succeeded with no changes,
357	* because the SHA1 already existed on the map. This is bad, there
358	* shouldn't be duplicated commits in the index.
359	*/
360	if (ret == 0) {
361	error(_("duplicate entry in bitmap index: '%s'"), oid_to_hex(oid));
362	return NULL;
363	}
364
365	kh_value(index->bitmaps, hash_pos) = stored;
366	return stored;
367	}
368
369	static inline uint32_t read_be32(const unsigned char buffer, size_t pos)
370	{
371	uint32_t result = get_be32(buffer + *pos);
372	(*pos) += sizeof(result);
373	return result;
374	}
375
376	static inline uint8_t read_u8(const unsigned char buffer, size_t pos)
377	{
378	return buffer[(*pos)++];
379	}
380
381	#define MAX_XOR_OFFSET 160
382
383	static int nth_bitmap_object_oid(struct bitmap_index *index,
384	struct object_id *oid,
385	uint32_t n)
386	{
387	if (index->midx)
388	return nth_midxed_object_oid(oid, index->midx, n) ? 0 : -1;
389	return nth_packed_object_id(oid, index->pack, n);
390	}
391
392	static int load_bitmap_entries_v1(struct bitmap_index *index)
393	{
394	uint32_t i;
395	struct stored_bitmap *recent_bitmaps[MAX_XOR_OFFSET] = { NULL };
396
397	for (i = 0; i < index->entry_count; ++i) {
398	int xor_offset, flags;
399	struct ewah_bitmap *bitmap = NULL;
400	struct stored_bitmap *xor_bitmap = NULL;
401	uint32_t commit_idx_pos;
402	struct object_id oid;
403	size_t entry_map_pos;
404
405	if (index->map_size - index->map_pos < 6)
406	return error(_("corrupt ewah bitmap: truncated header for entry %d"), i);
407
408	entry_map_pos = index->map_pos;
409	commit_idx_pos = read_be32(index->map, &index->map_pos);
410	xor_offset = read_u8(index->map, &index->map_pos);
411	flags = read_u8(index->map, &index->map_pos);
412
413	if (nth_bitmap_object_oid(index, &oid, commit_idx_pos) < 0)
414	return error(_("corrupt ewah bitmap: commit index %u out of range"),
415	(unsigned)commit_idx_pos);
416
417	if (xor_offset > MAX_XOR_OFFSET \|\| xor_offset > i)
418	return error(_("corrupted bitmap pack index"));
419
420	if (xor_offset > 0) {
421	xor_bitmap = recent_bitmaps[(i - xor_offset) % MAX_XOR_OFFSET];
422
423	if (!xor_bitmap)
424	return error(_("invalid XOR offset in bitmap pack index"));
425	}
426
427	bitmap = read_bitmap_1(index);
428	if (!bitmap)
429	return -1;
430
431	recent_bitmaps[i % MAX_XOR_OFFSET] =
432	store_bitmap(index, bitmap, &oid, xor_bitmap, flags,
433	entry_map_pos);
434	}
435
436	return 0;
437	}
438
439	char midx_bitmap_filename(struct multi_pack_index midx)
440	{
441	struct strbuf buf = STRBUF_INIT;
442	if (midx->has_chain)
443	get_split_midx_filename_ext(midx->source, &buf,
444	midx_get_checksum_hash(midx),
445	MIDX_EXT_BITMAP);
446	else
447	get_midx_filename_ext(midx->source, &buf,
448	midx_get_checksum_hash(midx),
449	MIDX_EXT_BITMAP);
450
451	return strbuf_detach(&buf, NULL);
452	}
453
454	char pack_bitmap_filename(struct packed_git p)
455	{
456	size_t len;
457
458	if (!strip_suffix(p->pack_name, ".pack", &len))
459	BUG("pack_name does not end in .pack");
460	return xstrfmt("%.*s.bitmap", (int)len, p->pack_name);
461	}
462
463	static int open_midx_bitmap(struct bitmap_index *bitmap_git,
464	struct multi_pack_index *midx)
465	{
466	struct stat st;
467	char *bitmap_name = midx_bitmap_filename(midx);
468	int fd = git_open(bitmap_name);
469	uint32_t i;
470
471	if (fd < 0) {
472	if (errno != ENOENT)
473	warning_errno("cannot open '%s'", bitmap_name);
474	free(bitmap_name);
475	return -1;
476	}
477	free(bitmap_name);
478
479	if (fstat(fd, &st)) {
480	error_errno(_("cannot fstat bitmap file"));
481	close(fd);
482	return -1;
483	}
484
485	if (bitmap_git->pack \|\| bitmap_git->midx) {
486	struct strbuf buf = STRBUF_INIT;
487	get_midx_filename(midx->source, &buf);
488	trace2_data_string("bitmap", bitmap_repo(bitmap_git),
489	"ignoring extra midx bitmap file", buf.buf);
490	close(fd);
491	strbuf_release(&buf);
492	return -1;
493	}
494
495	bitmap_git->midx = midx;
496	bitmap_git->map_size = xsize_t(st.st_size);
497	bitmap_git->map_pos = 0;
498	bitmap_git->map = xmmap(NULL, bitmap_git->map_size, PROT_READ,
499	MAP_PRIVATE, fd, 0);
500	close(fd);
501
502	if (load_bitmap_header(bitmap_git) < 0)
503	goto cleanup;
504
505	if (!hasheq(midx_get_checksum_hash(bitmap_git->midx), bitmap_git->checksum,
506	bitmap_repo(bitmap_git)->hash_algo)) {
507	error(_("checksum doesn't match in MIDX and bitmap"));
508	goto cleanup;
509	}
510
511	if (load_midx_revindex(bitmap_git->midx)) {
512	warning(_("multi-pack bitmap is missing required reverse index"));
513	goto cleanup;
514	}
515
516	for (i = 0; i < bitmap_git->midx->num_packs + bitmap_git->midx->num_packs_in_base; i++) {
517	if (prepare_midx_pack(bitmap_git->midx, i)) {
518	warning(_("could not open pack %s"),
519	bitmap_git->midx->pack_names[i]);
520	goto cleanup;
521	}
522	}
523
524	if (midx->base_midx) {
525	bitmap_git->base = prepare_midx_bitmap_git(midx->base_midx);
526	if (!bitmap_git->base) {
527	warning(_("could not open bitmap for base MIDX"));
528	goto cleanup;
529	}
530	bitmap_git->base_nr = bitmap_git->base->base_nr + 1;
531	} else {
532	bitmap_git->base_nr = 0;
533	}
534
535	return 0;
536
537	cleanup:
538	munmap(bitmap_git->map, bitmap_git->map_size);
539	bitmap_git->map_size = 0;
540	bitmap_git->map_pos = 0;
541	bitmap_git->map = NULL;
542	bitmap_git->midx = NULL;
543	return -1;
544	}
545
546	static int open_pack_bitmap(struct bitmap_index bitmap_git, struct packed_git packfile)
547	{
548	int fd;
549	struct stat st;
550	char *bitmap_name;
551
552	bitmap_name = pack_bitmap_filename(packfile);
553	fd = git_open(bitmap_name);
554
555	if (fd < 0) {
556	if (errno != ENOENT)
557	warning_errno("cannot open '%s'", bitmap_name);
558	free(bitmap_name);
559	return -1;
560	}
561	free(bitmap_name);
562
563	if (fstat(fd, &st)) {
564	error_errno(_("cannot fstat bitmap file"));
565	close(fd);
566	return -1;
567	}
568
569	if (bitmap_git->pack \|\| bitmap_git->midx) {
570	trace2_data_string("bitmap", bitmap_repo(bitmap_git),
571	"ignoring extra bitmap file",
572	packfile->pack_name);
573	close(fd);
574	return -1;
575	}
576
577	if (!is_pack_valid(packfile)) {
578	close(fd);
579	return -1;
580	}
581
582	bitmap_git->pack = packfile;
583	bitmap_git->map_size = xsize_t(st.st_size);
584	bitmap_git->map = xmmap(NULL, bitmap_git->map_size, PROT_READ, MAP_PRIVATE, fd, 0);
585	bitmap_git->map_pos = 0;
586	bitmap_git->base_nr = 0;
587	close(fd);
588
589	if (load_bitmap_header(bitmap_git) < 0) {
590	munmap(bitmap_git->map, bitmap_git->map_size);
591	bitmap_git->map = NULL;
592	bitmap_git->map_size = 0;
593	bitmap_git->map_pos = 0;
594	bitmap_git->pack = NULL;
595	return -1;
596	}
597
598	trace2_data_string("bitmap", bitmap_repo(bitmap_git),
599	"opened bitmap file", packfile->pack_name);
600	return 0;
601	}
602
603	static int load_reverse_index(struct repository r, struct bitmap_index bitmap_git)
604	{
605	if (bitmap_is_midx(bitmap_git)) {
606	struct multi_pack_index *m;
607
608	/*
609	* The multi-pack-index's .rev file is already loaded via
610	* open_pack_bitmap().
611	*
612	* But we still need to open the individual pack .rev files,
613	* since we will need to make use of them in pack-objects.
614	*/
615	for (m = bitmap_git->midx; m; m = m->base_midx) {
616	uint32_t i;
617	int ret;
618
619	for (i = 0; i < m->num_packs; i++) {
620	ret = load_pack_revindex(r, m->packs[i]);
621	if (ret)
622	return ret;
623	}
624	}
625	return 0;
626	}
627	return load_pack_revindex(r, bitmap_git->pack);
628	}
629
630	static void load_all_type_bitmaps(struct bitmap_index *bitmap_git)
631	{
632	struct bitmap_index *curr = bitmap_git;
633	size_t i = bitmap_git->base_nr;
634
635	ALLOC_ARRAY(bitmap_git->commits_all, bitmap_git->base_nr + 1);
636	ALLOC_ARRAY(bitmap_git->trees_all, bitmap_git->base_nr + 1);
637	ALLOC_ARRAY(bitmap_git->blobs_all, bitmap_git->base_nr + 1);
638	ALLOC_ARRAY(bitmap_git->tags_all, bitmap_git->base_nr + 1);
639
640	while (curr) {
641	bitmap_git->commits_all[i] = curr->commits;
642	bitmap_git->trees_all[i] = curr->trees;
643	bitmap_git->blobs_all[i] = curr->blobs;
644	bitmap_git->tags_all[i] = curr->tags;
645
646	curr = curr->base;
647	if (curr && !i)
648	BUG("unexpected number of bitmap layers, expected %"PRIu32,
649	bitmap_git->base_nr + 1);
650	i -= 1;
651	}
652	}
653
654	static int load_bitmap(struct repository r, struct bitmap_index bitmap_git,
655	int recursing)
656	{
657	assert(bitmap_git->map);
658
659	bitmap_git->bitmaps = kh_init_oid_map();
660	bitmap_git->ext_index.positions = kh_init_oid_pos();
661
662	if (load_reverse_index(r, bitmap_git))
663	return -1;
664
665	if (!(bitmap_git->commits = read_bitmap_1(bitmap_git)) \|\|
666	!(bitmap_git->trees = read_bitmap_1(bitmap_git)) \|\|
667	!(bitmap_git->blobs = read_bitmap_1(bitmap_git)) \|\|
668	!(bitmap_git->tags = read_bitmap_1(bitmap_git)))
669	return -1;
670
671	if (!bitmap_git->table_lookup && load_bitmap_entries_v1(bitmap_git) < 0)
672	return -1;
673
674	if (bitmap_git->base) {
675	if (!bitmap_is_midx(bitmap_git))
676	BUG("non-MIDX bitmap has non-NULL base bitmap index");
677	if (load_bitmap(r, bitmap_git->base, 1) < 0)
678	return -1;
679	}
680
681	if (!recursing)
682	load_all_type_bitmaps(bitmap_git);
683
684	return 0;
685	}
686
687	static int open_bitmap_for_source(struct odb_source_packed *source,
688	struct bitmap_index *bitmap_git)
689	{
690	struct multi_pack_index *midx = get_multi_pack_index(source);
691	struct packfile_list_entry *e;
692	bool found = false;
693
694	if (midx && !open_midx_bitmap(bitmap_git, midx))
695	found = true;
696
697	for (e = packfile_store_get_packs(source); e; e = e->next) {
698	/*
699	* When tracing is enabled we want to keep looking to report
700	* duplicates even if we have already found a bitmap.
701	*/
702	if (found && !trace2_is_enabled())
703	break;
704
705	if (!open_pack_bitmap(bitmap_git, e->pack))
706	found = true;
707	}
708
709	return found ? 0 : -1;
710	}
711
712	static int open_bitmap(struct repository *r,
713	struct bitmap_index *bitmap_git)
714	{
715	struct odb_source *source;
716	bool found = false;
717
718	assert(!bitmap_git->map);
719
720	odb_prepare_alternates(r->objects);
721	for (source = r->objects->sources; source; source = source->next) {
722	struct odb_source_files *files = odb_source_files_downcast(source);
723
724	if (!open_bitmap_for_source(files->packed, bitmap_git))
725	found = true;
726
727	/*
728	* The only reason to keep looking after having found a bitmap
729	* is to report duplicates.
730	*/
731	if (found && !trace2_is_enabled())
732	break;
733	}
734
735	return found ? 0 : -1;
736	}
737
738	struct bitmap_index prepare_bitmap_git(struct repository r)
739	{
740	struct bitmap_index bitmap_git = xcalloc(1, sizeof(bitmap_git));
741
742	if (!open_bitmap(r, bitmap_git) && !load_bitmap(r, bitmap_git, 0))
743	return bitmap_git;
744
745	free_bitmap_index(bitmap_git);
746	return NULL;
747	}
748
749	struct bitmap_index prepare_midx_bitmap_git(struct multi_pack_index midx)
750	{
751	struct bitmap_index bitmap_git = xcalloc(1, sizeof(bitmap_git));
752
753	if (!open_midx_bitmap(bitmap_git, midx))
754	return bitmap_git;
755
756	free_bitmap_index(bitmap_git);
757	return NULL;
758	}
759
760	struct bitmap_index prepare_bitmap_git_for_source(struct odb_source_packed source)
761	{
762	struct bitmap_index bitmap_git = xcalloc(1, sizeof(bitmap_git));
763
764	if (!open_bitmap_for_source(source, bitmap_git) &&
765	!load_bitmap(source->base.odb->repo, bitmap_git, 0))
766	return bitmap_git;
767
768	free_bitmap_index(bitmap_git);
769	return NULL;
770	}
771
772	int bitmap_index_contains_pack(struct bitmap_index bitmap, struct packed_git pack)
773	{
774	for (; bitmap; bitmap = bitmap->base) {
775	if (bitmap_is_midx(bitmap)) {
776	for (size_t i = 0; i < bitmap->midx->num_packs; i++)
777	if (bitmap->midx->packs[i] == pack)
778	return 1;
779	} else if (bitmap->pack == pack) {
780	return 1;
781	}
782	}
783
784	return 0;
785	}
786
787	struct include_data {
788	struct bitmap_index *bitmap_git;
789	struct bitmap *base;
790	struct bitmap *seen;
791	};
792
793	struct bitmap_lookup_table_triplet {
794	uint32_t commit_pos;
795	uint64_t offset;
796	uint32_t xor_row;
797	};
798
799	struct bitmap_lookup_table_xor_item {
800	struct object_id oid;
801	uint64_t offset;
802	};
803
804	/*
805	* Given a `triplet` struct pointer and pointer `p`, this
806	* function reads the triplet beginning at `p` into the struct.
807	* Note that this function assumes that there is enough memory
808	* left for filling the `triplet` struct from `p`.
809	*/
810	static int bitmap_lookup_table_get_triplet_by_pointer(struct bitmap_lookup_table_triplet *triplet,
811	const unsigned char *p)
812	{
813	if (!triplet)
814	return -1;
815
816	triplet->commit_pos = get_be32(p);
817	p += sizeof(uint32_t);
818	triplet->offset = get_be64(p);
819	p += sizeof(uint64_t);
820	triplet->xor_row = get_be32(p);
821	return 0;
822	}
823
824	/*
825	* This function gets the raw triplet from `row`'th row in the
826	* lookup table and fills that data to the `triplet`.
827	*/
828	static int bitmap_lookup_table_get_triplet(struct bitmap_index *bitmap_git,
829	uint32_t pos,
830	struct bitmap_lookup_table_triplet *triplet)
831	{
832	unsigned char *p = NULL;
833	if (pos >= bitmap_git->entry_count)
834	return error(_("corrupt bitmap lookup table: triplet position out of index"));
835
836	p = bitmap_git->table_lookup + st_mult(pos, BITMAP_LOOKUP_TABLE_TRIPLET_WIDTH);
837
838	return bitmap_lookup_table_get_triplet_by_pointer(triplet, p);
839	}
840
841	/*
842	* Searches for a matching triplet. `commit_pos` is a pointer
843	* to the wanted commit position value. `table_entry` points to
844	* a triplet in lookup table. The first 4 bytes of each
845	* triplet (pointed by `table_entry`) are compared with `*commit_pos`.
846	*/
847	static int triplet_cmp(const void commit_pos, const void table_entry)
848	{
849
850	uint32_t a = (uint32_t )commit_pos;
851	uint32_t b = get_be32(table_entry);
852	if (a > b)
853	return 1;
854	else if (a < b)
855	return -1;
856
857	return 0;
858	}
859
860	static uint32_t bitmap_bsearch_pos(struct bitmap_index *bitmap_git,
861	struct object_id *oid,
862	uint32_t *result)
863	{
864	int found;
865
866	if (bitmap_is_midx(bitmap_git))
867	found = bsearch_midx(oid, bitmap_git->midx, result);
868	else
869	found = bsearch_pack(oid, bitmap_git->pack, result);
870
871	return found;
872	}
873
874	/*
875	* `bsearch_triplet_by_pos` function searches for the raw triplet
876	* having commit position same as `commit_pos` and fills `triplet`
877	* object from the raw triplet. Returns 1 on success and 0 on
878	* failure.
879	*/
880	static int bitmap_bsearch_triplet_by_pos(uint32_t commit_pos,
881	struct bitmap_index *bitmap_git,
882	struct bitmap_lookup_table_triplet *triplet)
883	{
884	unsigned char *p = bsearch(&commit_pos, bitmap_git->table_lookup, bitmap_git->entry_count,
885	BITMAP_LOOKUP_TABLE_TRIPLET_WIDTH, triplet_cmp);
886
887	if (!p)
888	return -1;
889
890	return bitmap_lookup_table_get_triplet_by_pointer(triplet, p);
891	}
892
893	static struct stored_bitmap lazy_bitmap_for_commit(struct bitmap_index bitmap_git,
894	struct commit *commit)
895	{
896	uint32_t commit_pos, xor_row;
897	uint64_t offset;
898	int flags;
899	struct bitmap_lookup_table_triplet triplet;
900	struct object_id *oid = &commit->object.oid;
901	struct ewah_bitmap *bitmap;
902	struct stored_bitmap *xor_bitmap = NULL;
903	const int bitmap_header_size = 6;
904	static struct bitmap_lookup_table_xor_item *xor_items = NULL;
905	static size_t xor_items_nr = 0, xor_items_alloc = 0;
906	static int is_corrupt = 0;
907	int xor_flags;
908	khiter_t hash_pos;
909	struct bitmap_lookup_table_xor_item *xor_item;
910	size_t entry_map_pos;
911
912	if (is_corrupt)
913	return NULL;
914
915	if (!bitmap_bsearch_pos(bitmap_git, oid, &commit_pos))
916	return NULL;
917
918	if (bitmap_bsearch_triplet_by_pos(commit_pos, bitmap_git, &triplet) < 0)
919	return NULL;
920
921	xor_items_nr = 0;
922	offset = triplet.offset;
923	xor_row = triplet.xor_row;
924
925	while (xor_row != 0xffffffff) {
926	ALLOC_GROW(xor_items, xor_items_nr + 1, xor_items_alloc);
927
928	if (xor_items_nr + 1 >= bitmap_git->entry_count) {
929	error(_("corrupt bitmap lookup table: xor chain exceeds entry count"));
930	goto corrupt;
931	}
932
933	if (bitmap_lookup_table_get_triplet(bitmap_git, xor_row, &triplet) < 0)
934	goto corrupt;
935
936	xor_item = &xor_items[xor_items_nr];
937	xor_item->offset = triplet.offset;
938
939	if (nth_bitmap_object_oid(bitmap_git, &xor_item->oid, triplet.commit_pos) < 0) {
940	error(_("corrupt bitmap lookup table: commit index %u out of range"),
941	triplet.commit_pos);
942	goto corrupt;
943	}
944
945	hash_pos = kh_get_oid_map(bitmap_git->bitmaps, xor_item->oid);
946
947	/*
948	* If desired bitmap is already stored, we don't need
949	* to iterate further. Because we know that bitmaps
950	* that are needed to be parsed to parse this bitmap
951	* has already been stored. So, assign this stored bitmap
952	* to the xor_bitmap.
953	*/
954	if (hash_pos < kh_end(bitmap_git->bitmaps) &&
955	(xor_bitmap = kh_value(bitmap_git->bitmaps, hash_pos)))
956	break;
957	xor_items_nr++;
958	xor_row = triplet.xor_row;
959	}
960
961	while (xor_items_nr) {
962	xor_item = &xor_items[xor_items_nr - 1];
963	bitmap_git->map_pos = xor_item->offset;
964	if (bitmap_git->map_size - bitmap_git->map_pos < bitmap_header_size) {
965	error(_("corrupt ewah bitmap: truncated header for bitmap of commit \"%s\""),
966	oid_to_hex(&xor_item->oid));
967	goto corrupt;
968	}
969
970	entry_map_pos = bitmap_git->map_pos;
971	bitmap_git->map_pos += sizeof(uint32_t) + sizeof(uint8_t);
972	xor_flags = read_u8(bitmap_git->map, &bitmap_git->map_pos);
973	bitmap = read_bitmap_1(bitmap_git);
974
975	if (!bitmap)
976	goto corrupt;
977
978	xor_bitmap = store_bitmap(bitmap_git, bitmap, &xor_item->oid,
979	xor_bitmap, xor_flags, entry_map_pos);
980	xor_items_nr--;
981	}
982
983	bitmap_git->map_pos = offset;
984	if (bitmap_git->map_size - bitmap_git->map_pos < bitmap_header_size) {
985	error(_("corrupt ewah bitmap: truncated header for bitmap of commit \"%s\""),
986	oid_to_hex(oid));
987	goto corrupt;
988	}
989
990	/*
991	* Don't bother reading the commit's index position or its xor
992	* offset:
993	*
994	* - The commit's index position is irrelevant to us, since
995	* load_bitmap_entries_v1 only uses it to learn the object
996	* id which is used to compute the hashmap's key. We already
997	* have an object id, so no need to look it up again.
998	*
999	* - The xor_offset is unusable for us, since it specifies how
1000	* many entries previous to ours we should look at. This
1001	* makes sense when reading the bitmaps sequentially (as in
1002	* load_bitmap_entries_v1()), since we can keep track of
1003	* each bitmap as we read them.
1004	*
1005	* But it can't work for us, since the bitmap's don't have a
1006	* fixed size. So we learn the position of the xor'd bitmap
1007	* from the commit table (and resolve it to a bitmap in the
1008	* above if-statement).
1009	*
1010	* Instead, we can skip ahead and immediately read the flags and
1011	* ewah bitmap.
1012	*/
1013	entry_map_pos = bitmap_git->map_pos;
1014	bitmap_git->map_pos += sizeof(uint32_t) + sizeof(uint8_t);
1015	flags = read_u8(bitmap_git->map, &bitmap_git->map_pos);
1016	bitmap = read_bitmap_1(bitmap_git);
1017
1018	if (!bitmap)
1019	goto corrupt;
1020
1021	return store_bitmap(bitmap_git, bitmap, oid, xor_bitmap, flags,
1022	entry_map_pos);
1023
1024	corrupt:
1025	free(xor_items);
1026	is_corrupt = 1;
1027	return NULL;
1028	}
1029
1030	static struct ewah_bitmap find_bitmap_for_commit(struct bitmap_index bitmap_git,
1031	struct commit *commit,
1032	struct bitmap_index **found)
1033	{
1034	khiter_t hash_pos;
1035	if (!bitmap_git)
1036	return NULL;
1037
1038	hash_pos = kh_get_oid_map(bitmap_git->bitmaps, commit->object.oid);
1039	if (hash_pos >= kh_end(bitmap_git->bitmaps)) {
1040	struct stored_bitmap *bitmap = NULL;
1041	if (!bitmap_git->table_lookup)
1042	return find_bitmap_for_commit(bitmap_git->base, commit,
1043	found);
1044
1045	/* this is a fairly hot codepath - no trace2_region please */
1046	/* NEEDSWORK: cache misses aren't recorded */
1047	bitmap = lazy_bitmap_for_commit(bitmap_git, commit);
1048	if (!bitmap)
1049	return find_bitmap_for_commit(bitmap_git->base, commit,
1050	found);
1051	if (found)
1052	*found = bitmap_git;
1053	return lookup_stored_bitmap(bitmap);
1054	}
1055	if (found)
1056	*found = bitmap_git;
1057	return lookup_stored_bitmap(kh_value(bitmap_git->bitmaps, hash_pos));
1058	}
1059
1060	struct ewah_bitmap bitmap_for_commit(struct bitmap_index bitmap_git,
1061	struct commit *commit)
1062	{
1063	return find_bitmap_for_commit(bitmap_git, commit, NULL);
1064	}
1065
1066	static inline int bitmap_position_extended(struct bitmap_index *bitmap_git,
1067	const struct object_id *oid)
1068	{
1069	kh_oid_pos_t *positions = bitmap_git->ext_index.positions;
1070	khiter_t pos = kh_get_oid_pos(positions, *oid);
1071
1072	if (pos < kh_end(positions)) {
1073	int bitmap_pos = kh_value(positions, pos);
1074	return bitmap_pos + bitmap_num_objects_total(bitmap_git);
1075	}
1076
1077	return -1;
1078	}
1079
1080	static inline int bitmap_position_packfile(struct bitmap_index *bitmap_git,
1081	const struct object_id *oid)
1082	{
1083	uint32_t pos;
1084	off_t offset = find_pack_entry_one(oid, bitmap_git->pack);
1085	if (!offset)
1086	return -1;
1087
1088	if (offset_to_pack_pos(bitmap_git->pack, offset, &pos) < 0)
1089	return -1;
1090	return pos;
1091	}
1092
1093	static int bitmap_position_midx(struct bitmap_index *bitmap_git,
1094	const struct object_id *oid)
1095	{
1096	uint32_t want, got;
1097	if (!bsearch_midx(oid, bitmap_git->midx, &want))
1098	return -1;
1099
1100	if (midx_to_pack_pos(bitmap_git->midx, want, &got) < 0)
1101	return -1;
1102	return got;
1103	}
1104
1105	static int bitmap_position(struct bitmap_index *bitmap_git,
1106	const struct object_id *oid)
1107	{
1108	int pos;
1109	if (bitmap_is_midx(bitmap_git))
1110	pos = bitmap_position_midx(bitmap_git, oid);
1111	else
1112	pos = bitmap_position_packfile(bitmap_git, oid);
1113	return (pos >= 0) ? pos : bitmap_position_extended(bitmap_git, oid);
1114	}
1115
1116	static int ext_index_add_object(struct bitmap_index *bitmap_git,
1117	struct object object, const char name)
1118	{
1119	struct eindex *eindex = &bitmap_git->ext_index;
1120
1121	khiter_t hash_pos;
1122	int hash_ret;
1123	int bitmap_pos;
1124
1125	hash_pos = kh_put_oid_pos(eindex->positions, object->oid, &hash_ret);
1126	if (hash_ret > 0) {
1127	if (eindex->count >= eindex->alloc) {
1128	eindex->alloc = (eindex->alloc + 16) * 3 / 2;
1129	REALLOC_ARRAY(eindex->objects, eindex->alloc);
1130	REALLOC_ARRAY(eindex->hashes, eindex->alloc);
1131	}
1132
1133	bitmap_pos = eindex->count;
1134	eindex->objects[eindex->count] = object;
1135	eindex->hashes[eindex->count] = pack_name_hash(name);
1136	kh_value(eindex->positions, hash_pos) = bitmap_pos;
1137	eindex->count++;
1138	} else {
1139	bitmap_pos = kh_value(eindex->positions, hash_pos);
1140	}
1141
1142	return bitmap_pos + bitmap_num_objects_total(bitmap_git);
1143	}
1144
1145	struct bitmap_show_data {
1146	struct bitmap_index *bitmap_git;
1147	struct bitmap *base;
1148	};
1149
1150	static void show_object(struct object object, const char name, void *data_)
1151	{
1152	struct bitmap_show_data *data = data_;
1153	int bitmap_pos;
1154
1155	bitmap_pos = bitmap_position(data->bitmap_git, &object->oid);
1156
1157	if (bitmap_pos < 0)
1158	bitmap_pos = ext_index_add_object(data->bitmap_git, object,
1159	name);
1160
1161	bitmap_set(data->base, bitmap_pos);
1162	}
1163
1164	static void show_commit(struct commit *commit UNUSED,
1165	void *data UNUSED)
1166	{
1167	}
1168
1169	static unsigned apply_pseudo_merges_for_commit_1(struct bitmap_index *bitmap_git,
1170	struct bitmap *result,
1171	struct commit *commit,
1172	uint32_t commit_pos)
1173	{
1174	struct bitmap_index *curr = bitmap_git;
1175	int ret = 0;
1176
1177	while (curr) {
1178	ret += apply_pseudo_merges_for_commit(&curr->pseudo_merges,
1179	result, commit,
1180	commit_pos);
1181	curr = curr->base;
1182	}
1183
1184	if (ret)
1185	pseudo_merges_satisfied_nr += ret;
1186
1187	return ret;
1188	}
1189
1190	static int add_to_include_set(struct bitmap_index *bitmap_git,
1191	struct include_data *data,
1192	struct commit *commit,
1193	int bitmap_pos)
1194	{
1195	struct ewah_bitmap *partial;
1196
1197	if (data->seen && bitmap_get(data->seen, bitmap_pos))
1198	return 0;
1199
1200	if (bitmap_get(data->base, bitmap_pos))
1201	return 0;
1202
1203	partial = bitmap_for_commit(bitmap_git, commit);
1204	if (partial) {
1205	existing_bitmaps_hits_nr++;
1206
1207	bitmap_or_ewah(data->base, partial);
1208	return 0;
1209	}
1210
1211	existing_bitmaps_misses_nr++;
1212
1213	bitmap_set(data->base, bitmap_pos);
1214	if (apply_pseudo_merges_for_commit_1(bitmap_git, data->base, commit,
1215	bitmap_pos))
1216	return 0;
1217
1218	return 1;
1219	}
1220
1221	static int should_include(struct commit commit, void _data)
1222	{
1223	struct include_data *data = _data;
1224	int bitmap_pos;
1225
1226	bitmap_pos = bitmap_position(data->bitmap_git, &commit->object.oid);
1227	if (bitmap_pos < 0)
1228	bitmap_pos = ext_index_add_object(data->bitmap_git,
1229	(struct object *)commit,
1230	NULL);
1231
1232	if (!add_to_include_set(data->bitmap_git, data, commit, bitmap_pos)) {
1233	struct commit_list *parent = commit->parents;
1234
1235	while (parent) {
1236	parent->item->object.flags \|= SEEN;
1237	parent = parent->next;
1238	}
1239
1240	return 0;
1241	}
1242
1243	return 1;
1244	}
1245
1246	static int should_include_obj(struct object obj, void _data)
1247	{
1248	struct include_data *data = _data;
1249	int bitmap_pos;
1250
1251	bitmap_pos = bitmap_position(data->bitmap_git, &obj->oid);
1252	if (bitmap_pos < 0)
1253	return 1;
1254	if ((data->seen && bitmap_get(data->seen, bitmap_pos)) \|\|
1255	bitmap_get(data->base, bitmap_pos)) {
1256	obj->flags \|= SEEN;
1257	return 0;
1258	}
1259	return 1;
1260	}
1261
1262	static int add_commit_to_bitmap(struct bitmap_index *bitmap_git,
1263	struct bitmap **base,
1264	struct commit *commit)
1265	{
1266	struct ewah_bitmap *or_with = bitmap_for_commit(bitmap_git, commit);
1267
1268	if (!or_with) {
1269	existing_bitmaps_misses_nr++;
1270	return 0;
1271	}
1272
1273	existing_bitmaps_hits_nr++;
1274
1275	if (!*base)
1276	*base = ewah_to_bitmap(or_with);
1277	else
1278	bitmap_or_ewah(*base, or_with);
1279
1280	return 1;
1281	}
1282
1283	static struct bitmap fill_in_bitmap(struct bitmap_index bitmap_git,
1284	struct rev_info *revs,
1285	struct bitmap *base,
1286	struct bitmap *seen)
1287	{
1288	struct include_data incdata;
1289	struct bitmap_show_data show_data;
1290
1291	if (!base)
1292	base = bitmap_new();
1293
1294	incdata.bitmap_git = bitmap_git;
1295	incdata.base = base;
1296	incdata.seen = seen;
1297
1298	revs->include_check = should_include;
1299	revs->include_check_obj = should_include_obj;
1300	revs->include_check_data = &incdata;
1301
1302	if (prepare_revision_walk(revs))
1303	die(_("revision walk setup failed"));
1304
1305	show_data.bitmap_git = bitmap_git;
1306	show_data.base = base;
1307
1308	traverse_commit_list(revs, show_commit, show_object, &show_data);
1309
1310	revs->include_check = NULL;
1311	revs->include_check_obj = NULL;
1312	revs->include_check_data = NULL;
1313
1314	return base;
1315	}
1316
1317	struct bitmap_boundary_cb {
1318	struct bitmap_index *bitmap_git;
1319	struct bitmap *base;
1320
1321	struct object_array boundary;
1322	};
1323
1324	static void show_boundary_commit(struct commit commit, void _data)
1325	{
1326	struct bitmap_boundary_cb *data = _data;
1327
1328	if (commit->object.flags & BOUNDARY)
1329	add_object_array(&commit->object, "", &data->boundary);
1330
1331	if (commit->object.flags & UNINTERESTING) {
1332	if (bitmap_walk_contains(data->bitmap_git, data->base,
1333	&commit->object.oid))
1334	return;
1335
1336	add_commit_to_bitmap(data->bitmap_git, &data->base, commit);
1337	}
1338	}
1339
1340	static void show_boundary_object(struct object *object UNUSED,
1341	const char *name UNUSED,
1342	void *data UNUSED)
1343	{
1344	BUG("should not be called");
1345	}
1346
1347	static unsigned cascade_pseudo_merges_1(struct bitmap_index *bitmap_git,
1348	struct bitmap *result,
1349	struct bitmap *roots)
1350	{
1351	int ret = cascade_pseudo_merges(&bitmap_git->pseudo_merges,
1352	result, roots);
1353	if (ret) {
1354	pseudo_merges_cascades_nr++;
1355	pseudo_merges_satisfied_nr += ret;
1356	}
1357
1358	return ret;
1359	}
1360
1361	static struct bitmap find_boundary_objects(struct bitmap_index bitmap_git,
1362	struct rev_info *revs,
1363	struct object_list *roots)
1364	{
1365	struct bitmap_boundary_cb cb;
1366	struct object_list *root;
1367	struct repository *repo;
1368	unsigned int i;
1369	unsigned int tmp_blobs, tmp_trees, tmp_tags;
1370	int any_missing = 0;
1371	int existing_bitmaps = 0;
1372
1373	cb.bitmap_git = bitmap_git;
1374	cb.base = bitmap_new();
1375	object_array_init(&cb.boundary);
1376
1377	repo = bitmap_repo(bitmap_git);
1378
1379	revs->ignore_missing_links = 1;
1380
1381	if (bitmap_git->pseudo_merges.nr) {
1382	struct bitmap *roots_bitmap = bitmap_new();
1383	struct object_list *objects = NULL;
1384
1385	for (objects = roots; objects; objects = objects->next) {
1386	struct object *object = objects->item;
1387	int pos;
1388
1389	pos = bitmap_position(bitmap_git, &object->oid);
1390	if (pos < 0)
1391	continue;
1392
1393	bitmap_set(roots_bitmap, pos);
1394	}
1395
1396	cascade_pseudo_merges_1(bitmap_git, cb.base, roots_bitmap);
1397	bitmap_free(roots_bitmap);
1398	}
1399
1400	/*
1401	* OR in any existing reachability bitmaps among `roots` into
1402	* `cb.base`.
1403	*/
1404	for (root = roots; root; root = root->next) {
1405	struct object *object = root->item;
1406	if (object->type != OBJ_COMMIT \|\|
1407	bitmap_walk_contains(bitmap_git, cb.base, &object->oid))
1408	continue;
1409
1410	if (add_commit_to_bitmap(bitmap_git, &cb.base,
1411	(struct commit *)object)) {
1412	existing_bitmaps = 1;
1413	continue;
1414	}
1415
1416	any_missing = 1;
1417	}
1418
1419	if (!any_missing)
1420	goto cleanup;
1421
1422	if (existing_bitmaps)
1423	cascade_pseudo_merges_1(bitmap_git, cb.base, NULL);
1424
1425	tmp_blobs = revs->blob_objects;
1426	tmp_trees = revs->tree_objects;
1427	tmp_tags = revs->tag_objects;
1428	revs->blob_objects = 0;
1429	revs->tree_objects = 0;
1430	revs->tag_objects = 0;
1431
1432	/*
1433	* We didn't have complete coverage of the roots. First setup a
1434	* revision walk to (a) OR in any bitmaps that are UNINTERESTING
1435	* between the tips and boundary, and (b) record the boundary.
1436	*/
1437	trace2_region_enter("pack-bitmap", "boundary-prepare", repo);
1438	if (prepare_revision_walk(revs))
1439	die("revision walk setup failed");
1440	trace2_region_leave("pack-bitmap", "boundary-prepare", repo);
1441
1442	trace2_region_enter("pack-bitmap", "boundary-traverse", repo);
1443	revs->boundary = 1;
1444	traverse_commit_list_filtered(revs,
1445	show_boundary_commit,
1446	show_boundary_object,
1447	&cb, NULL);
1448	revs->boundary = 0;
1449	trace2_region_leave("pack-bitmap", "boundary-traverse", repo);
1450
1451	revs->blob_objects = tmp_blobs;
1452	revs->tree_objects = tmp_trees;
1453	revs->tag_objects = tmp_tags;
1454
1455	reset_revision_walk();
1456	clear_object_flags(repo, UNINTERESTING);
1457
1458	/*
1459	* Then add the boundary commit(s) as fill-in traversal tips.
1460	*/
1461	trace2_region_enter("pack-bitmap", "boundary-fill-in", repo);
1462	for (i = 0; i < cb.boundary.nr; i++) {
1463	struct object *obj = cb.boundary.objects[i].item;
1464	if (bitmap_walk_contains(bitmap_git, cb.base, &obj->oid))
1465	obj->flags \|= SEEN;
1466	else
1467	add_pending_object(revs, obj, "");
1468	}
1469	if (revs->pending.nr)
1470	cb.base = fill_in_bitmap(bitmap_git, revs, cb.base, NULL);
1471	trace2_region_leave("pack-bitmap", "boundary-fill-in", repo);
1472
1473	cleanup:
1474	object_array_clear(&cb.boundary);
1475	revs->ignore_missing_links = 0;
1476
1477	return cb.base;
1478	}
1479
1480	struct ewah_bitmap pseudo_merge_bitmap_for_commit(struct bitmap_index bitmap_git,
1481	struct commit *commit)
1482	{
1483	struct commit_list *p;
1484	struct bitmap *parents;
1485	struct pseudo_merge *match = NULL;
1486
1487	if (!bitmap_git->pseudo_merges.nr)
1488	return NULL;
1489
1490	parents = bitmap_new();
1491
1492	for (p = commit->parents; p; p = p->next) {
1493	int pos = bitmap_position(bitmap_git, &p->item->object.oid);
1494	if (pos < 0 \|\| pos >= bitmap_num_objects(bitmap_git))
1495	goto done;
1496
1497	/*
1498	* Use bitmap-relative positions instead of offsetting
1499	* by bitmap_git->num_objects_in_base because we use
1500	* this to find a match in pseudo_merge_for_parents(),
1501	* and pseudo-merge groups cannot span multiple bitmap
1502	* layers.
1503	*/
1504	bitmap_set(parents, pos);
1505	}
1506
1507	match = pseudo_merge_for_parents(&bitmap_git->pseudo_merges, parents);
1508
1509	done:
1510	bitmap_free(parents);
1511	if (match)
1512	return pseudo_merge_bitmap(&bitmap_git->pseudo_merges, match);
1513
1514	return NULL;
1515	}
1516
1517	static void unsatisfy_all_pseudo_merges(struct bitmap_index *bitmap_git)
1518	{
1519	uint32_t i;
1520	for (i = 0; i < bitmap_git->pseudo_merges.nr; i++)
1521	bitmap_git->pseudo_merges.v[i].satisfied = 0;
1522	}
1523
1524	static struct bitmap find_objects(struct bitmap_index bitmap_git,
1525	struct rev_info *revs,
1526	struct object_list *roots,
1527	struct bitmap *seen)
1528	{
1529	struct bitmap *base = NULL;
1530	int needs_walk = 0;
1531	unsigned existing_bitmaps = 0;
1532
1533	struct object_list *not_mapped = NULL;
1534
1535	unsatisfy_all_pseudo_merges(bitmap_git);
1536
1537	if (bitmap_git->pseudo_merges.nr) {
1538	struct bitmap *roots_bitmap = bitmap_new();
1539	struct object_list *objects = NULL;
1540
1541	for (objects = roots; objects; objects = objects->next) {
1542	struct object *object = objects->item;
1543	int pos;
1544
1545	pos = bitmap_position(bitmap_git, &object->oid);
1546	if (pos < 0)
1547	continue;
1548
1549	bitmap_set(roots_bitmap, pos);
1550	}
1551
1552	base = bitmap_new();
1553	cascade_pseudo_merges_1(bitmap_git, base, roots_bitmap);
1554	bitmap_free(roots_bitmap);
1555	}
1556
1557	/*
1558	* Go through all the roots for the walk. The ones that have bitmaps
1559	* on the bitmap index will be `or`ed together to form an initial
1560	* global reachability analysis.
1561	*
1562	* The ones without bitmaps in the index will be stored in the
1563	* `not_mapped_list` for further processing.
1564	*/
1565	while (roots) {
1566	struct object *object = roots->item;
1567
1568	roots = roots->next;
1569
1570	if (base) {
1571	int pos = bitmap_position(bitmap_git, &object->oid);
1572	if (pos >= 0 && bitmap_get(base, pos)) {
1573	object->flags \|= SEEN;
1574	continue;
1575	}
1576	}
1577
1578	if (object->type == OBJ_COMMIT &&
1579	add_commit_to_bitmap(bitmap_git, &base, (struct commit *)object)) {
1580	object->flags \|= SEEN;
1581	existing_bitmaps = 1;
1582	continue;
1583	}
1584
1585	object_list_insert(object, &not_mapped);
1586	}
1587
1588	/*
1589	* Best case scenario: We found bitmaps for all the roots,
1590	* so the resulting `or` bitmap has the full reachability analysis
1591	*/
1592	if (!not_mapped)
1593	return base;
1594
1595	roots = not_mapped;
1596
1597	if (existing_bitmaps)
1598	cascade_pseudo_merges_1(bitmap_git, base, NULL);
1599
1600	/*
1601	* Let's iterate through all the roots that don't have bitmaps to
1602	* check if we can determine them to be reachable from the existing
1603	* global bitmap.
1604	*
1605	* If we cannot find them in the existing global bitmap, we'll need
1606	* to push them to an actual walk and run it until we can confirm
1607	* they are reachable
1608	*/
1609	while (roots) {
1610	struct object *object = roots->item;
1611	int pos;
1612
1613	roots = roots->next;
1614	pos = bitmap_position(bitmap_git, &object->oid);
1615
1616	if (pos < 0 \|\| base == NULL \|\| !bitmap_get(base, pos)) {
1617	object->flags &= ~UNINTERESTING;
1618	add_pending_object(revs, object, "");
1619	needs_walk = 1;
1620
1621	roots_without_bitmaps_nr++;
1622	} else {
1623	object->flags \|= SEEN;
1624
1625	roots_with_bitmaps_nr++;
1626	}
1627	}
1628
1629	if (needs_walk) {
1630	/*
1631	* This fill-in traversal may walk over some objects
1632	* again, since we have already traversed in order to
1633	* find the boundary.
1634	*
1635	* But this extra walk should be extremely cheap, since
1636	* all commit objects are loaded into memory, and
1637	* because we skip walking to parents that are
1638	* UNINTERESTING, since it will be marked in the haves
1639	* bitmap already (or it has an on-disk bitmap, since
1640	* OR-ing it in covers all of its ancestors).
1641	*/
1642	base = fill_in_bitmap(bitmap_git, revs, base, seen);
1643	}
1644
1645	object_list_free(&not_mapped);
1646
1647	return base;
1648	}
1649
1650	static void show_extended_objects(struct bitmap_index *bitmap_git,
1651	struct rev_info *revs,
1652	show_reachable_fn show_reach)
1653	{
1654	struct bitmap *objects = bitmap_git->result;
1655	struct eindex *eindex = &bitmap_git->ext_index;
1656	uint32_t i;
1657
1658	for (i = 0; i < eindex->count; ++i) {
1659	struct object *obj;
1660
1661	if (!bitmap_get(objects,
1662	st_add(bitmap_num_objects_total(bitmap_git),
1663	i)))
1664	continue;
1665
1666	obj = eindex->objects[i];
1667	if ((obj->type == OBJ_BLOB && !revs->blob_objects) \|\|
1668	(obj->type == OBJ_TREE && !revs->tree_objects) \|\|
1669	(obj->type == OBJ_TAG && !revs->tag_objects))
1670	continue;
1671
1672	show_reach(&obj->oid, obj->type, 0, eindex->hashes[i], NULL, 0, NULL);
1673	}
1674	}
1675
1676	static void init_type_iterator(struct ewah_or_iterator *it,
1677	struct bitmap_index *bitmap_git,
1678	enum object_type type)
1679	{
1680	switch (type) {
1681	case OBJ_COMMIT:
1682	ewah_or_iterator_init(it, bitmap_git->commits_all,
1683	bitmap_git->base_nr + 1);
1684	break;
1685
1686	case OBJ_TREE:
1687	ewah_or_iterator_init(it, bitmap_git->trees_all,
1688	bitmap_git->base_nr + 1);
1689	break;
1690
1691	case OBJ_BLOB:
1692	ewah_or_iterator_init(it, bitmap_git->blobs_all,
1693	bitmap_git->base_nr + 1);
1694	break;
1695
1696	case OBJ_TAG:
1697	ewah_or_iterator_init(it, bitmap_git->tags_all,
1698	bitmap_git->base_nr + 1);
1699	break;
1700
1701	default:
1702	BUG("object type %d not stored by bitmap type index", type);
1703	break;
1704	}
1705	}
1706
1707	static int show_objects_for_type(
1708	struct bitmap_index *bitmap_git,
1709	struct bitmap *objects,
1710	enum object_type object_type,
1711	show_reachable_fn show_reach,
1712	void *payload)
1713	{
1714	size_t i = 0;
1715	uint32_t offset;
1716	int ret;
1717
1718	struct ewah_or_iterator it;
1719	eword_t filter;
1720
1721	init_type_iterator(&it, bitmap_git, object_type);
1722
1723	for (i = 0; i < objects->word_alloc &&
1724	ewah_or_iterator_next(&filter, &it); i++) {
1725	eword_t word = objects->words[i] & filter;
1726	size_t pos = (i * BITS_IN_EWORD);
1727
1728	if (!word)
1729	continue;
1730
1731	for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
1732	struct packed_git *pack;
1733	struct object_id oid;
1734	uint32_t hash = 0, index_pos;
1735	off_t ofs;
1736
1737	if ((word >> offset) == 0)
1738	break;
1739
1740	offset += ewah_bit_ctz64(word >> offset);
1741
1742	if (bitmap_is_midx(bitmap_git)) {
1743	struct multi_pack_index *m = bitmap_git->midx;
1744	uint32_t pack_id;
1745
1746	index_pos = pack_pos_to_midx(m, pos + offset);
1747	ofs = nth_midxed_offset(m, index_pos);
1748	nth_midxed_object_oid(&oid, m, index_pos);
1749
1750	pack_id = nth_midxed_pack_int_id(m, index_pos);
1751	pack = nth_midxed_pack(bitmap_git->midx, pack_id);
1752	} else {
1753	index_pos = pack_pos_to_index(bitmap_git->pack, pos + offset);
1754	ofs = pack_pos_to_offset(bitmap_git->pack, pos + offset);
1755	nth_bitmap_object_oid(bitmap_git, &oid, index_pos);
1756
1757	pack = bitmap_git->pack;
1758	}
1759
1760	hash = bitmap_name_hash(bitmap_git, index_pos);
1761
1762	ret = show_reach(&oid, object_type, 0, hash, pack, ofs, payload);
1763	if (ret)
1764	goto out;
1765	}
1766	}
1767
1768	ret = 0;
1769
1770	out:
1771	ewah_or_iterator_release(&it);
1772	return ret;
1773	}
1774
1775	static int in_bitmapped_pack(struct bitmap_index *bitmap_git,
1776	struct object_list *roots)
1777	{
1778	while (roots) {
1779	struct object *object = roots->item;
1780	roots = roots->next;
1781
1782	if (bitmap_is_midx(bitmap_git)) {
1783	if (bsearch_midx(&object->oid, bitmap_git->midx, NULL))
1784	return 1;
1785	} else {
1786	if (find_pack_entry_one(&object->oid, bitmap_git->pack) > 0)
1787	return 1;
1788	}
1789	}
1790
1791	return 0;
1792	}
1793
1794	static struct bitmap find_tip_objects(struct bitmap_index bitmap_git,
1795	struct object_list *tip_objects,
1796	enum object_type type)
1797	{
1798	struct bitmap *result = bitmap_new();
1799	struct object_list *p;
1800
1801	for (p = tip_objects; p; p = p->next) {
1802	int pos;
1803
1804	if (p->item->type != type)
1805	continue;
1806
1807	pos = bitmap_position(bitmap_git, &p->item->oid);
1808	if (pos < 0)
1809	continue;
1810
1811	bitmap_set(result, pos);
1812	}
1813
1814	return result;
1815	}
1816
1817	static void filter_bitmap_exclude_type(struct bitmap_index *bitmap_git,
1818	struct object_list *tip_objects,
1819	struct bitmap *to_filter,
1820	enum object_type type)
1821	{
1822	struct eindex *eindex = &bitmap_git->ext_index;
1823	struct bitmap *tips;
1824	struct ewah_or_iterator it;
1825	eword_t mask;
1826	uint32_t i;
1827
1828	/*
1829	* The non-bitmap version of this filter never removes
1830	* objects which the other side specifically asked for,
1831	* so we must match that behavior.
1832	*/
1833	tips = find_tip_objects(bitmap_git, tip_objects, type);
1834
1835	/*
1836	* We can use the type-level bitmap for 'type' to work in whole
1837	* words for the objects that are actually in the bitmapped
1838	* packfile.
1839	*/
1840	for (i = 0, init_type_iterator(&it, bitmap_git, type);
1841	i < to_filter->word_alloc && ewah_or_iterator_next(&mask, &it);
1842	i++) {
1843	if (i < tips->word_alloc)
1844	mask &= ~tips->words[i];
1845	to_filter->words[i] &= ~mask;
1846	}
1847
1848	/*
1849	* Clear any objects that weren't in the packfile (and so would
1850	* not have been caught by the loop above. We'll have to check
1851	* them individually.
1852	*/
1853	for (i = 0; i < eindex->count; i++) {
1854	size_t pos = st_add(i, bitmap_num_objects_total(bitmap_git));
1855	if (eindex->objects[i]->type == type &&
1856	bitmap_get(to_filter, pos) &&
1857	!bitmap_get(tips, pos))
1858	bitmap_unset(to_filter, pos);
1859	}
1860
1861	ewah_or_iterator_release(&it);
1862	bitmap_free(tips);
1863	}
1864
1865	static void filter_bitmap_blob_none(struct bitmap_index *bitmap_git,
1866	struct object_list *tip_objects,
1867	struct bitmap *to_filter)
1868	{
1869	filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
1870	OBJ_BLOB);
1871	}
1872
1873	static unsigned long get_size_by_pos(struct bitmap_index *bitmap_git,
1874	uint32_t pos)
1875	{
1876	size_t size;
1877	struct object_info oi = OBJECT_INFO_INIT;
1878
1879	oi.sizep = &size;
1880
1881	if (pos < bitmap_num_objects_total(bitmap_git)) {
1882	struct packed_git *pack;
1883	off_t ofs;
1884
1885	if (bitmap_is_midx(bitmap_git)) {
1886	uint32_t midx_pos = pack_pos_to_midx(bitmap_git->midx, pos);
1887	uint32_t pack_id = nth_midxed_pack_int_id(bitmap_git->midx, midx_pos);
1888
1889	pack = nth_midxed_pack(bitmap_git->midx, pack_id);
1890	ofs = nth_midxed_offset(bitmap_git->midx, midx_pos);
1891	} else {
1892	pack = bitmap_git->pack;
1893	ofs = pack_pos_to_offset(pack, pos);
1894	}
1895
1896	if (packed_object_info(NULL, pack, ofs, &oi) < 0) {
1897	struct object_id oid;
1898	nth_bitmap_object_oid(bitmap_git, &oid,
1899	pack_pos_to_index(pack, pos));
1900	die(_("unable to get size of %s"), oid_to_hex(&oid));
1901	}
1902	} else {
1903	size_t eindex_pos = pos - bitmap_num_objects_total(bitmap_git);
1904	struct eindex *eindex = &bitmap_git->ext_index;
1905	struct object *obj = eindex->objects[eindex_pos];
1906	if (odb_read_object_info_extended(bitmap_repo(bitmap_git)->objects, &obj->oid,
1907	&oi, 0) < 0)
1908	die(_("unable to get size of %s"), oid_to_hex(&obj->oid));
1909	}
1910
1911	return cast_size_t_to_ulong(size);
1912	}
1913
1914	static void filter_bitmap_blob_limit(struct bitmap_index *bitmap_git,
1915	struct object_list *tip_objects,
1916	struct bitmap *to_filter,
1917	unsigned long limit)
1918	{
1919	struct eindex *eindex = &bitmap_git->ext_index;
1920	struct bitmap *tips;
1921	struct ewah_or_iterator it;
1922	eword_t mask;
1923	uint32_t i;
1924
1925	tips = find_tip_objects(bitmap_git, tip_objects, OBJ_BLOB);
1926
1927	for (i = 0, init_type_iterator(&it, bitmap_git, OBJ_BLOB);
1928	i < to_filter->word_alloc && ewah_or_iterator_next(&mask, &it);
1929	i++) {
1930	eword_t word = to_filter->words[i] & mask;
1931	unsigned offset;
1932
1933	for (offset = 0; offset < BITS_IN_EWORD; offset++) {
1934	uint32_t pos;
1935
1936	if ((word >> offset) == 0)
1937	break;
1938	offset += ewah_bit_ctz64(word >> offset);
1939	pos = i * BITS_IN_EWORD + offset;
1940
1941	if (!bitmap_get(tips, pos) &&
1942	get_size_by_pos(bitmap_git, pos) >= limit)
1943	bitmap_unset(to_filter, pos);
1944	}
1945	}
1946
1947	for (i = 0; i < eindex->count; i++) {
1948	size_t pos = st_add(i, bitmap_num_objects(bitmap_git));
1949	if (eindex->objects[i]->type == OBJ_BLOB &&
1950	bitmap_get(to_filter, pos) &&
1951	!bitmap_get(tips, pos) &&
1952	get_size_by_pos(bitmap_git, pos) >= limit)
1953	bitmap_unset(to_filter, pos);
1954	}
1955
1956	ewah_or_iterator_release(&it);
1957	bitmap_free(tips);
1958	}
1959
1960	static void filter_bitmap_tree_depth(struct bitmap_index *bitmap_git,
1961	struct object_list *tip_objects,
1962	struct bitmap *to_filter,
1963	unsigned long limit)
1964	{
1965	if (limit)
1966	BUG("filter_bitmap_tree_depth given non-zero limit");
1967
1968	filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
1969	OBJ_TREE);
1970	filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
1971	OBJ_BLOB);
1972	}
1973
1974	static void filter_bitmap_object_type(struct bitmap_index *bitmap_git,
1975	struct object_list *tip_objects,
1976	struct bitmap *to_filter,
1977	enum object_type object_type)
1978	{
1979	if (object_type < OBJ_COMMIT \|\| object_type > OBJ_TAG)
1980	BUG("filter_bitmap_object_type given invalid object");
1981
1982	if (object_type != OBJ_TAG)
1983	filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_TAG);
1984	if (object_type != OBJ_COMMIT)
1985	filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_COMMIT);
1986	if (object_type != OBJ_TREE)
1987	filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_TREE);
1988	if (object_type != OBJ_BLOB)
1989	filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_BLOB);
1990	}
1991
1992	static int filter_bitmap(struct bitmap_index *bitmap_git,
1993	struct object_list *tip_objects,
1994	struct bitmap *to_filter,
1995	const struct list_objects_filter_options *filter)
1996	{
1997	if (!filter \|\| filter->choice == LOFC_DISABLED)
1998	return 0;
1999
2000	if (filter->choice == LOFC_BLOB_NONE) {
2001	if (bitmap_git)
2002	filter_bitmap_blob_none(bitmap_git, tip_objects,
2003	to_filter);
2004	return 0;
2005	}
2006
2007	if (filter->choice == LOFC_BLOB_LIMIT) {
2008	if (bitmap_git)
2009	filter_bitmap_blob_limit(bitmap_git, tip_objects,
2010	to_filter,
2011	filter->blob_limit_value);
2012	return 0;
2013	}
2014
2015	if (filter->choice == LOFC_TREE_DEPTH &&
2016	filter->tree_exclude_depth == 0) {
2017	if (bitmap_git)
2018	filter_bitmap_tree_depth(bitmap_git, tip_objects,
2019	to_filter,
2020	filter->tree_exclude_depth);
2021	return 0;
2022	}
2023
2024	if (filter->choice == LOFC_OBJECT_TYPE) {
2025	if (bitmap_git)
2026	filter_bitmap_object_type(bitmap_git, tip_objects,
2027	to_filter,
2028	filter->object_type);
2029	return 0;
2030	}
2031
2032	if (filter->choice == LOFC_COMBINE) {
2033	int i;
2034	for (i = 0; i < filter->sub_nr; i++) {
2035	if (filter_bitmap(bitmap_git, tip_objects, to_filter,
2036	&filter->sub[i]) < 0)
2037	return -1;
2038	}
2039	return 0;
2040	}
2041
2042	/* filter choice not handled */
2043	return -1;
2044	}
2045
2046	bool can_filter_bitmap(const struct list_objects_filter_options *filter)
2047	{
2048	return !filter_bitmap(NULL, NULL, NULL, filter);
2049	}
2050
2051	static void filter_packed_objects_from_bitmap(struct bitmap_index *bitmap_git,
2052	struct bitmap *result)
2053	{
2054	struct eindex *eindex = &bitmap_git->ext_index;
2055	uint32_t objects_nr;
2056	size_t i, pos;
2057
2058	objects_nr = bitmap_num_objects_total(bitmap_git);
2059	pos = objects_nr / BITS_IN_EWORD;
2060
2061	if (pos > result->word_alloc)
2062	pos = result->word_alloc;
2063
2064	memset(result->words, 0x00, sizeof(eword_t) * pos);
2065	for (i = pos * BITS_IN_EWORD; i < objects_nr; i++)
2066	bitmap_unset(result, i);
2067
2068	for (i = 0; i < eindex->count; ++i) {
2069	if (has_object_pack(bitmap_repo(bitmap_git),
2070	&eindex->objects[i]->oid))
2071	bitmap_unset(result, objects_nr + i);
2072	}
2073	}
2074
2075	int for_each_bitmapped_object(struct bitmap_index *bitmap_git,
2076	const struct list_objects_filter_options *filter,
2077	show_reachable_fn show_reach,
2078	void *payload)
2079	{
2080	const enum object_type types[] = {
2081	OBJ_COMMIT,
2082	OBJ_TREE,
2083	OBJ_BLOB,
2084	OBJ_TAG,
2085	};
2086	struct bitmap *filtered_bitmap = NULL;
2087	uint32_t objects_nr;
2088	size_t full_word_count;
2089	int ret;
2090
2091	if (!can_filter_bitmap(filter)) {
2092	ret = -1;
2093	goto out;
2094	}
2095
2096	objects_nr = bitmap_num_objects(bitmap_git);
2097	full_word_count = objects_nr / BITS_IN_EWORD;
2098
2099	/* We start from the all-1 bitmap and then filter down from there. */
2100	filtered_bitmap = bitmap_word_alloc(full_word_count + !!(objects_nr % BITS_IN_EWORD));
2101	memset(filtered_bitmap->words, 0xff, full_word_count * sizeof(*filtered_bitmap->words));
2102	for (size_t i = full_word_count * BITS_IN_EWORD; i < objects_nr; i++)
2103	bitmap_set(filtered_bitmap, i);
2104
2105	if (filter_bitmap(bitmap_git, NULL, filtered_bitmap, filter) < 0) {
2106	ret = -1;
2107	goto out;
2108	}
2109
2110	for (size_t i = 0; i < ARRAY_SIZE(types); i++) {
2111	ret = show_objects_for_type(bitmap_git, filtered_bitmap,
2112	types[i], show_reach, payload);
2113	if (ret)
2114	goto out;
2115	}
2116
2117	ret = 0;
2118	out:
2119	bitmap_free(filtered_bitmap);
2120	return ret;
2121	}
2122
2123	struct bitmap_index prepare_bitmap_walk(struct rev_info revs,
2124	int filter_provided_objects)
2125	{
2126	unsigned int i;
2127	int use_boundary_traversal;
2128
2129	struct object_list *wants = NULL;
2130	struct object_list *haves = NULL;
2131
2132	struct bitmap *wants_bitmap = NULL;
2133	struct bitmap *haves_bitmap = NULL;
2134
2135	struct bitmap_index *bitmap_git;
2136	struct repository *repo;
2137
2138	/*
2139	* We can't do pathspec limiting with bitmaps, because we don't know
2140	* which commits are associated with which object changes (let alone
2141	* even which objects are associated with which paths).
2142	*/
2143	if (revs->prune)
2144	return NULL;
2145
2146	if (!can_filter_bitmap(&revs->filter))
2147	return NULL;
2148
2149	/* try to open a bitmapped pack, but don't parse it yet
2150	* because we may not need to use it */
2151	CALLOC_ARRAY(bitmap_git, 1);
2152	if (open_bitmap(revs->repo, bitmap_git) < 0)
2153	goto cleanup;
2154
2155	for (i = 0; i < revs->pending.nr; ++i) {
2156	struct object *object = revs->pending.objects[i].item;
2157
2158	if (object->type == OBJ_NONE)
2159	parse_object_or_die(revs->repo, &object->oid, NULL);
2160
2161	while (object->type == OBJ_TAG) {
2162	struct tag tag = (struct tag ) object;
2163
2164	if (object->flags & UNINTERESTING)
2165	object_list_insert(object, &haves);
2166	else
2167	object_list_insert(object, &wants);
2168
2169	object = parse_object_or_die(revs->repo, get_tagged_oid(tag), NULL);
2170	object->flags \|= (tag->object.flags & UNINTERESTING);
2171	}
2172
2173	if (object->flags & UNINTERESTING)
2174	object_list_insert(object, &haves);
2175	else
2176	object_list_insert(object, &wants);
2177	}
2178
2179	use_boundary_traversal = git_env_bool(GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL, -1);
2180	if (use_boundary_traversal < 0) {
2181	prepare_repo_settings(revs->repo);
2182	use_boundary_traversal = revs->repo->settings.pack_use_bitmap_boundary_traversal;
2183	}
2184
2185	if (!use_boundary_traversal) {
2186	/*
2187	* if we have a HAVES list, but none of those haves is contained
2188	* in the packfile that has a bitmap, we don't have anything to
2189	* optimize here
2190	*/
2191	if (haves && !in_bitmapped_pack(bitmap_git, haves))
2192	goto cleanup;
2193	}
2194
2195	/* if we don't want anything, we're done here */
2196	if (!wants)
2197	goto cleanup;
2198
2199	/*
2200	* now we're going to use bitmaps, so load the actual bitmap entries
2201	* from disk. this is the point of no return; after this the rev_list
2202	* becomes invalidated and we must perform the revwalk through bitmaps
2203	*/
2204	if (load_bitmap(revs->repo, bitmap_git, 0) < 0)
2205	goto cleanup;
2206
2207	if (!use_boundary_traversal)
2208	object_array_clear(&revs->pending);
2209
2210	repo = bitmap_repo(bitmap_git);
2211
2212	if (haves) {
2213	if (use_boundary_traversal) {
2214	trace2_region_enter("pack-bitmap", "haves/boundary", repo);
2215	haves_bitmap = find_boundary_objects(bitmap_git, revs, haves);
2216	trace2_region_leave("pack-bitmap", "haves/boundary", repo);
2217	} else {
2218	trace2_region_enter("pack-bitmap", "haves/classic", repo);
2219	revs->ignore_missing_links = 1;
2220	haves_bitmap = find_objects(bitmap_git, revs, haves, NULL);
2221	reset_revision_walk();
2222	revs->ignore_missing_links = 0;
2223	trace2_region_leave("pack-bitmap", "haves/classic", repo);
2224	}
2225
2226	if (!haves_bitmap)
2227	BUG("failed to perform bitmap walk");
2228	}
2229
2230	if (use_boundary_traversal) {
2231	object_array_clear(&revs->pending);
2232	reset_revision_walk();
2233	}
2234
2235	wants_bitmap = find_objects(bitmap_git, revs, wants, haves_bitmap);
2236
2237	if (!wants_bitmap)
2238	BUG("failed to perform bitmap walk");
2239
2240	if (haves_bitmap)
2241	bitmap_and_not(wants_bitmap, haves_bitmap);
2242
2243	filter_bitmap(bitmap_git,
2244	(revs->filter.choice && filter_provided_objects) ? NULL : wants,
2245	wants_bitmap,
2246	&revs->filter);
2247
2248	if (revs->unpacked)
2249	filter_packed_objects_from_bitmap(bitmap_git, wants_bitmap);
2250
2251	bitmap_git->result = wants_bitmap;
2252	bitmap_git->haves = haves_bitmap;
2253
2254	object_list_free(&wants);
2255	object_list_free(&haves);
2256
2257	trace2_data_intmax("bitmap", repo, "pseudo_merges_satisfied",
2258	pseudo_merges_satisfied_nr);
2259	trace2_data_intmax("bitmap", repo, "pseudo_merges_cascades",
2260	pseudo_merges_cascades_nr);
2261	trace2_data_intmax("bitmap", repo, "bitmap/hits",
2262	existing_bitmaps_hits_nr);
2263	trace2_data_intmax("bitmap", repo, "bitmap/misses",
2264	existing_bitmaps_misses_nr);
2265	trace2_data_intmax("bitmap", repo, "bitmap/roots_with_bitmap",
2266	roots_with_bitmaps_nr);
2267	trace2_data_intmax("bitmap", repo, "bitmap/roots_without_bitmap",
2268	roots_without_bitmaps_nr);
2269
2270	return bitmap_git;
2271
2272	cleanup:
2273	free_bitmap_index(bitmap_git);
2274	object_list_free(&wants);
2275	object_list_free(&haves);
2276	return NULL;
2277	}
2278
2279	/*
2280	* -1 means "stop trying further objects"; 0 means we may or may not have
2281	* reused, but you can keep feeding bits.
2282	*/
2283	static int try_partial_reuse(struct bitmap_index *bitmap_git,
2284	struct bitmapped_pack *pack,
2285	size_t bitmap_pos,
2286	uint32_t pack_pos,
2287	off_t offset,
2288	struct bitmap *reuse,
2289	struct pack_window **w_curs)
2290	{
2291	off_t delta_obj_offset;
2292	enum object_type type;
2293	size_t size;
2294
2295	if (pack_pos >= pack->p->num_objects)
2296	return -1; /* not actually in the pack */
2297
2298	delta_obj_offset = offset;
2299	type = unpack_object_header(pack->p, w_curs, &offset, &size);
2300	if (type < 0)
2301	return -1; /* broken packfile, punt */
2302
2303	if (type == OBJ_REF_DELTA \|\| type == OBJ_OFS_DELTA) {
2304	off_t base_offset;
2305	uint32_t base_pos;
2306	uint32_t base_bitmap_pos;
2307
2308	/*
2309	* Find the position of the base object so we can look it up
2310	* in our bitmaps. If we can't come up with an offset, or if
2311	* that offset is not in the revidx, the pack is corrupt.
2312	* There's nothing we can do, so just punt on this object,
2313	* and the normal slow path will complain about it in
2314	* more detail.
2315	*/
2316	base_offset = get_delta_base(pack->p, w_curs, &offset, type,
2317	delta_obj_offset);
2318	if (!base_offset)
2319	return 0;
2320
2321	offset_to_pack_pos(pack->p, base_offset, &base_pos);
2322
2323	if (bitmap_is_midx(bitmap_git)) {
2324	/*
2325	* Cross-pack deltas are rejected for now, but could
2326	* theoretically be supported in the future.
2327	*
2328	* We would need to ensure that we're sending both
2329	* halves of the delta/base pair, regardless of whether
2330	* or not the two cross a pack boundary. If they do,
2331	* then we must convert the delta to an REF_DELTA to
2332	* refer back to the base in the other pack.
2333	* */
2334	if (midx_pair_to_pack_pos(bitmap_git->midx,
2335	pack->pack_int_id,
2336	base_offset,
2337	&base_bitmap_pos) < 0) {
2338	return 0;
2339	}
2340	} else {
2341	if (offset_to_pack_pos(pack->p, base_offset,
2342	&base_pos) < 0)
2343	return 0;
2344	/*
2345	* We assume delta dependencies always point backwards.
2346	* This lets us do a single pass, and is basically
2347	* always true due to the way OFS_DELTAs work. You would
2348	* not typically find REF_DELTA in a bitmapped pack,
2349	* since we only bitmap packs we write fresh, and
2350	* OFS_DELTA is the default). But let's double check to
2351	* make sure the pack wasn't written with odd
2352	* parameters.
2353	*/
2354	if (base_pos >= pack_pos)
2355	return 0;
2356	base_bitmap_pos = pack->bitmap_pos + base_pos;
2357	}
2358
2359	/*
2360	* And finally, if we're not sending the base as part of our
2361	* reuse chunk, then don't send this object either. The base
2362	* would come after us, along with other objects not
2363	* necessarily in the pack, which means we'd need to convert
2364	* to REF_DELTA on the fly. Better to just let the normal
2365	* object_entry code path handle it.
2366	*/
2367	if (!bitmap_get(reuse, base_bitmap_pos))
2368	return 0;
2369	}
2370
2371	/*
2372	* If we got here, then the object is OK to reuse. Mark it.
2373	*/
2374	bitmap_set(reuse, bitmap_pos);
2375	return 0;
2376	}
2377
2378	static void reuse_partial_packfile_from_bitmap_1(struct bitmap_index *bitmap_git,
2379	struct bitmapped_pack *pack,
2380	struct bitmap *reuse)
2381	{
2382	struct bitmap *result = bitmap_git->result;
2383	struct pack_window *w_curs = NULL;
2384	size_t pos = pack->bitmap_pos / BITS_IN_EWORD;
2385
2386	if (!pack->bitmap_pos) {
2387	/*
2388	* If we're processing the first (in the case of a MIDX, the
2389	* preferred pack) or the only (in the case of single-pack
2390	* bitmaps) pack, then we can reuse whole words at a time.
2391	*
2392	* This is because we know that any deltas in this range must
2393	* have their bases chosen from the same pack, since:
2394	*
2395	* - In the single pack case, there is no other pack to choose
2396	* them from.
2397	*
2398	* - In the MIDX case, the first pack is the preferred pack, so
2399	* all ties are broken in favor of that pack (i.e. the one
2400	* we're currently processing). So any duplicate bases will be
2401	* resolved in favor of the pack we're processing.
2402	*/
2403	while (pos < result->word_alloc &&
2404	pos < pack->bitmap_nr / BITS_IN_EWORD &&
2405	result->words[pos] == (eword_t)~0)
2406	pos++;
2407	memset(reuse->words, 0xFF, pos * sizeof(eword_t));
2408	}
2409
2410	for (; pos < result->word_alloc; pos++) {
2411	eword_t word = result->words[pos];
2412	size_t offset;
2413
2414	for (offset = 0; offset < BITS_IN_EWORD; offset++) {
2415	size_t bit_pos;
2416	uint32_t pack_pos;
2417	off_t ofs;
2418
2419	if (word >> offset == 0)
2420	break;
2421
2422	offset += ewah_bit_ctz64(word >> offset);
2423
2424	bit_pos = pos * BITS_IN_EWORD + offset;
2425	if (bit_pos < pack->bitmap_pos)
2426	continue;
2427	if (bit_pos >= pack->bitmap_pos + pack->bitmap_nr)
2428	goto done;
2429
2430	if (bitmap_is_midx(bitmap_git)) {
2431	uint32_t midx_pos;
2432
2433	midx_pos = pack_pos_to_midx(bitmap_git->midx, bit_pos);
2434	ofs = nth_midxed_offset(bitmap_git->midx, midx_pos);
2435
2436	if (offset_to_pack_pos(pack->p, ofs, &pack_pos) < 0)
2437	BUG("could not find object in pack %s "
2438	"at offset %"PRIuMAX" in MIDX",
2439	pack_basename(pack->p), (uintmax_t)ofs);
2440	} else {
2441	pack_pos = cast_size_t_to_uint32_t(st_sub(bit_pos, pack->bitmap_pos));
2442	if (pack_pos >= pack->p->num_objects)
2443	BUG("advanced beyond the end of pack %s (%"PRIuMAX" > %"PRIu32")",
2444	pack_basename(pack->p), (uintmax_t)pack_pos,
2445	pack->p->num_objects);
2446
2447	ofs = pack_pos_to_offset(pack->p, pack_pos);
2448	}
2449
2450	if (try_partial_reuse(bitmap_git, pack, bit_pos,
2451	pack_pos, ofs, reuse, &w_curs) < 0) {
2452	/*
2453	* try_partial_reuse indicated we couldn't reuse
2454	* any bits, so there is no point in trying more
2455	* bits in the current word, or any other words
2456	* in result.
2457	*
2458	* Jump out of both loops to avoid future
2459	* unnecessary calls to try_partial_reuse.
2460	*/
2461	goto done;
2462	}
2463	}
2464	}
2465
2466	done:
2467	unuse_pack(&w_curs);
2468	}
2469
2470	static int bitmapped_pack_cmp(const void va, const void vb)
2471	{
2472	const struct bitmapped_pack *a = va;
2473	const struct bitmapped_pack *b = vb;
2474
2475	if (a->bitmap_pos < b->bitmap_pos)
2476	return -1;
2477	if (a->bitmap_pos > b->bitmap_pos)
2478	return 1;
2479	return 0;
2480	}
2481
2482	void reuse_partial_packfile_from_bitmap(struct bitmap_index *bitmap_git,
2483	struct bitmapped_pack **packs_out,
2484	size_t *packs_nr_out,
2485	struct bitmap **reuse_out,
2486	int multi_pack_reuse)
2487	{
2488	struct repository *r = bitmap_repo(bitmap_git);
2489	struct bitmapped_pack *packs = NULL;
2490	struct bitmap *result = bitmap_git->result;
2491	struct bitmap *reuse;
2492	size_t i;
2493	size_t packs_nr = 0, packs_alloc = 0;
2494	size_t word_alloc;
2495	uint32_t objects_nr = 0;
2496
2497	assert(result);
2498
2499	load_reverse_index(r, bitmap_git);
2500
2501	if (!bitmap_is_midx(bitmap_git) \|\| !bitmap_git->midx->chunk_bitmapped_packs)
2502	multi_pack_reuse = 0;
2503
2504	if (multi_pack_reuse) {
2505	struct multi_pack_index *m = bitmap_git->midx;
2506	for (i = 0; i < m->num_packs + m->num_packs_in_base; i++) {
2507	struct bitmapped_pack pack;
2508	if (nth_bitmapped_pack(bitmap_git->midx, &pack, i) < 0) {
2509	warning(_("unable to load pack: '%s', disabling pack-reuse"),
2510	bitmap_git->midx->pack_names[i]);
2511	free(packs);
2512	return;
2513	}
2514
2515	if (!pack.bitmap_nr)
2516	continue;
2517
2518	if (is_pack_valid(pack.p)) {
2519	ALLOC_GROW(packs, packs_nr + 1, packs_alloc);
2520	memcpy(&packs[packs_nr++], &pack, sizeof(pack));
2521	}
2522
2523	objects_nr += pack.p->num_objects;
2524	}
2525
2526	QSORT(packs, packs_nr, bitmapped_pack_cmp);
2527	} else {
2528	struct packed_git *pack;
2529	uint32_t pack_int_id;
2530
2531	if (bitmap_is_midx(bitmap_git)) {
2532	struct multi_pack_index *m = bitmap_git->midx;
2533	uint32_t preferred_pack_pos;
2534
2535	while (m->base_midx)
2536	m = m->base_midx;
2537
2538	if (midx_preferred_pack(m, &preferred_pack_pos) < 0) {
2539	warning(_("unable to compute preferred pack, disabling pack-reuse"));
2540	return;
2541	}
2542
2543	pack = nth_midxed_pack(m, preferred_pack_pos);
2544	pack_int_id = preferred_pack_pos;
2545	} else {
2546	pack = bitmap_git->pack;
2547	/*
2548	* Any value for 'pack_int_id' will do here. When we
2549	* process the pack via try_partial_reuse(), we won't
2550	* use the `pack_int_id` field since we have a non-MIDX
2551	* bitmap.
2552	*
2553	* Use '-1' as a sentinel value to make it clear
2554	* that we do not expect to read this field.
2555	*/
2556	pack_int_id = -1;
2557	}
2558
2559	if (is_pack_valid(pack)) {
2560	ALLOC_GROW(packs, packs_nr + 1, packs_alloc);
2561	packs[packs_nr].p = pack;
2562	packs[packs_nr].pack_int_id = pack_int_id;
2563	packs[packs_nr].bitmap_nr = pack->num_objects;
2564	packs[packs_nr].bitmap_pos = 0;
2565	packs[packs_nr].from_midx = bitmap_git->midx;
2566	packs_nr++;
2567	}
2568
2569	objects_nr = pack->num_objects;
2570	}
2571
2572	if (!packs_nr)
2573	return;
2574
2575	word_alloc = objects_nr / BITS_IN_EWORD;
2576	if (objects_nr % BITS_IN_EWORD)
2577	word_alloc++;
2578	reuse = bitmap_word_alloc(word_alloc);
2579
2580	for (i = 0; i < packs_nr; i++)
2581	reuse_partial_packfile_from_bitmap_1(bitmap_git, &packs[i], reuse);
2582
2583	if (bitmap_is_empty(reuse)) {
2584	free(packs);
2585	bitmap_free(reuse);
2586	return;
2587	}
2588
2589	/*
2590	* Drop any reused objects from the result, since they will not
2591	* need to be handled separately.
2592	*/
2593	bitmap_and_not(result, reuse);
2594	*packs_out = packs;
2595	*packs_nr_out = packs_nr;
2596	*reuse_out = reuse;
2597	}
2598
2599	int bitmap_walk_contains(struct bitmap_index *bitmap_git,
2600	struct bitmap bitmap, const struct object_id oid)
2601	{
2602	int idx;
2603
2604	if (!bitmap)
2605	return 0;
2606
2607	idx = bitmap_position(bitmap_git, oid);
2608	return idx >= 0 && bitmap_get(bitmap, idx);
2609	}
2610
2611	void traverse_bitmap_commit_list(struct bitmap_index *bitmap_git,
2612	struct rev_info *revs,
2613	show_reachable_fn show_reachable)
2614	{
2615	assert(bitmap_git->result);
2616
2617	show_objects_for_type(bitmap_git, bitmap_git->result,
2618	OBJ_COMMIT, show_reachable, NULL);
2619	if (revs->tree_objects)
2620	show_objects_for_type(bitmap_git, bitmap_git->result,
2621	OBJ_TREE, show_reachable, NULL);
2622	if (revs->blob_objects)
2623	show_objects_for_type(bitmap_git, bitmap_git->result,
2624	OBJ_BLOB, show_reachable, NULL);
2625	if (revs->tag_objects)
2626	show_objects_for_type(bitmap_git, bitmap_git->result,
2627	OBJ_TAG, show_reachable, NULL);
2628
2629	show_extended_objects(bitmap_git, revs, show_reachable);
2630	}
2631
2632	static uint32_t count_object_type(struct bitmap_index *bitmap_git,
2633	enum object_type type)
2634	{
2635	struct bitmap *objects = bitmap_git->result;
2636	struct eindex *eindex = &bitmap_git->ext_index;
2637
2638	uint32_t i = 0, count = 0;
2639	struct ewah_or_iterator it;
2640	eword_t filter;
2641
2642	init_type_iterator(&it, bitmap_git, type);
2643
2644	while (i < objects->word_alloc && ewah_or_iterator_next(&filter, &it)) {
2645	eword_t word = objects->words[i++] & filter;
2646	count += ewah_bit_popcount64(word);
2647	}
2648
2649	for (i = 0; i < eindex->count; ++i) {
2650	if (eindex->objects[i]->type == type &&
2651	bitmap_get(objects,
2652	st_add(bitmap_num_objects_total(bitmap_git), i)))
2653	count++;
2654	}
2655
2656	ewah_or_iterator_release(&it);
2657
2658	return count;
2659	}
2660
2661	void count_bitmap_commit_list(struct bitmap_index *bitmap_git,
2662	uint32_t commits, uint32_t trees,
2663	uint32_t blobs, uint32_t tags)
2664	{
2665	assert(bitmap_git->result);
2666
2667	if (commits)
2668	*commits = count_object_type(bitmap_git, OBJ_COMMIT);
2669
2670	if (trees)
2671	*trees = count_object_type(bitmap_git, OBJ_TREE);
2672
2673	if (blobs)
2674	*blobs = count_object_type(bitmap_git, OBJ_BLOB);
2675
2676	if (tags)
2677	*tags = count_object_type(bitmap_git, OBJ_TAG);
2678	}
2679
2680	struct bitmap_test_data {
2681	struct bitmap_index *bitmap_git;
2682	struct bitmap *base;
2683	struct bitmap *commits;
2684	struct bitmap *trees;
2685	struct bitmap *blobs;
2686	struct bitmap *tags;
2687	struct progress *prg;
2688	size_t seen;
2689
2690	struct bitmap_test_data *base_tdata;
2691	};
2692
2693	static void test_bitmap_type(struct bitmap_test_data *tdata,
2694	struct object *obj, int pos)
2695	{
2696	enum object_type bitmap_type = OBJ_NONE;
2697	int bitmaps_nr = 0;
2698
2699	if (bitmap_is_midx(tdata->bitmap_git)) {
2700	while (pos < tdata->bitmap_git->midx->num_objects_in_base)
2701	tdata = tdata->base_tdata;
2702	}
2703
2704	if (bitmap_get(tdata->commits, pos)) {
2705	bitmap_type = OBJ_COMMIT;
2706	bitmaps_nr++;
2707	}
2708	if (bitmap_get(tdata->trees, pos)) {
2709	bitmap_type = OBJ_TREE;
2710	bitmaps_nr++;
2711	}
2712	if (bitmap_get(tdata->blobs, pos)) {
2713	bitmap_type = OBJ_BLOB;
2714	bitmaps_nr++;
2715	}
2716	if (bitmap_get(tdata->tags, pos)) {
2717	bitmap_type = OBJ_TAG;
2718	bitmaps_nr++;
2719	}
2720
2721	if (bitmap_type == OBJ_NONE)
2722	die(_("object '%s' not found in type bitmaps"),
2723	oid_to_hex(&obj->oid));
2724
2725	if (bitmaps_nr > 1)
2726	die(_("object '%s' does not have a unique type"),
2727	oid_to_hex(&obj->oid));
2728
2729	if (bitmap_type != obj->type)
2730	die(_("object '%s': real type '%s', expected: '%s'"),
2731	oid_to_hex(&obj->oid),
2732	type_name(obj->type),
2733	type_name(bitmap_type));
2734	}
2735
2736	static void test_show_object(struct object *object,
2737	const char *name UNUSED,
2738	void *data)
2739	{
2740	struct bitmap_test_data *tdata = data;
2741	int bitmap_pos;
2742
2743	bitmap_pos = bitmap_position(tdata->bitmap_git, &object->oid);
2744	if (bitmap_pos < 0)
2745	die(_("object not in bitmap: '%s'"), oid_to_hex(&object->oid));
2746	test_bitmap_type(tdata, object, bitmap_pos);
2747
2748	bitmap_set(tdata->base, bitmap_pos);
2749	display_progress(tdata->prg, ++tdata->seen);
2750	}
2751
2752	static void test_show_commit(struct commit commit, void data)
2753	{
2754	struct bitmap_test_data *tdata = data;
2755	int bitmap_pos;
2756
2757	bitmap_pos = bitmap_position(tdata->bitmap_git,
2758	&commit->object.oid);
2759	if (bitmap_pos < 0)
2760	die(_("object not in bitmap: '%s'"), oid_to_hex(&commit->object.oid));
2761	test_bitmap_type(tdata, &commit->object, bitmap_pos);
2762
2763	bitmap_set(tdata->base, bitmap_pos);
2764	display_progress(tdata->prg, ++tdata->seen);
2765	}
2766
2767	static uint32_t bitmap_total_entry_count(struct bitmap_index *bitmap_git)
2768	{
2769	uint32_t total = 0;
2770	do {
2771	total = st_add(total, bitmap_git->entry_count);
2772	bitmap_git = bitmap_git->base;
2773	} while (bitmap_git);
2774
2775	return total;
2776	}
2777
2778	static void bitmap_test_data_prepare(struct bitmap_test_data *tdata,
2779	struct bitmap_index *bitmap_git)
2780	{
2781	memset(tdata, 0, sizeof(struct bitmap_test_data));
2782
2783	tdata->bitmap_git = bitmap_git;
2784	tdata->base = bitmap_new();
2785	tdata->commits = ewah_to_bitmap(bitmap_git->commits);
2786	tdata->trees = ewah_to_bitmap(bitmap_git->trees);
2787	tdata->blobs = ewah_to_bitmap(bitmap_git->blobs);
2788	tdata->tags = ewah_to_bitmap(bitmap_git->tags);
2789
2790	if (bitmap_git->base) {
2791	tdata->base_tdata = xmalloc(sizeof(struct bitmap_test_data));
2792	bitmap_test_data_prepare(tdata->base_tdata, bitmap_git->base);
2793	}
2794	}
2795
2796	static void bitmap_test_data_release(struct bitmap_test_data *tdata)
2797	{
2798	if (!tdata)
2799	return;
2800
2801	bitmap_test_data_release(tdata->base_tdata);
2802	free(tdata->base_tdata);
2803
2804	bitmap_free(tdata->base);
2805	bitmap_free(tdata->commits);
2806	bitmap_free(tdata->trees);
2807	bitmap_free(tdata->blobs);
2808	bitmap_free(tdata->tags);
2809	}
2810
2811	void test_bitmap_walk(struct rev_info *revs)
2812	{
2813	struct object *root;
2814	struct bitmap *result = NULL;
2815	size_t result_popcnt;
2816	struct bitmap_test_data tdata;
2817	struct bitmap_index bitmap_git, found;
2818	struct ewah_bitmap *bm;
2819
2820	if (!(bitmap_git = prepare_bitmap_git(revs->repo)))
2821	die(_("failed to load bitmap indexes"));
2822
2823	if (revs->pending.nr != 1)
2824	die(_("you must specify exactly one commit to test"));
2825
2826	fprintf_ln(stderr, "Bitmap v%d test (%d entries%s, %d total)",
2827	bitmap_git->version,
2828	bitmap_git->entry_count,
2829	bitmap_git->table_lookup ? "" : " loaded",
2830	bitmap_total_entry_count(bitmap_git));
2831
2832	root = revs->pending.objects[0].item;
2833	bm = find_bitmap_for_commit(bitmap_git, (struct commit *)root, &found);
2834
2835	if (bm) {
2836	fprintf_ln(stderr, "Found bitmap for '%s'. %d bits / %08x checksum",
2837	oid_to_hex(&root->oid),
2838	(int)bm->bit_size, ewah_checksum(bm));
2839
2840	if (bitmap_is_midx(found))
2841	fprintf_ln(stderr, "Located via MIDX '%s'.",
2842	midx_get_checksum_hex(found->midx));
2843	else
2844	fprintf_ln(stderr, "Located via pack '%s'.",
2845	hash_to_hex_algop(found->pack->hash,
2846	revs->repo->hash_algo));
2847
2848	result = ewah_to_bitmap(bm);
2849	}
2850
2851	if (!result)
2852	die(_("commit '%s' doesn't have an indexed bitmap"), oid_to_hex(&root->oid));
2853
2854	revs->tag_objects = 1;
2855	revs->tree_objects = 1;
2856	revs->blob_objects = 1;
2857
2858	result_popcnt = bitmap_popcount(result);
2859
2860	if (prepare_revision_walk(revs))
2861	die(_("revision walk setup failed"));
2862
2863	bitmap_test_data_prepare(&tdata, bitmap_git);
2864	tdata.prg = start_progress(revs->repo,
2865	"Verifying bitmap entries",
2866	result_popcnt);
2867
2868	traverse_commit_list(revs, &test_show_commit, &test_show_object, &tdata);
2869
2870	stop_progress(&tdata.prg);
2871
2872	if (bitmap_equals(result, tdata.base))
2873	fprintf_ln(stderr, "OK!");
2874	else
2875	die(_("mismatch in bitmap results"));
2876
2877	bitmap_free(result);
2878	bitmap_test_data_release(&tdata);
2879	free_bitmap_index(bitmap_git);
2880	}
2881
2882	int test_bitmap_commits(struct repository *r)
2883	{
2884	struct object_id oid;
2885	MAYBE_UNUSED void *value;
2886	struct bitmap_index *bitmap_git = prepare_bitmap_git(r);
2887
2888	if (!bitmap_git)
2889	die(_("failed to load bitmap indexes"));
2890
2891	/*
2892	* Since this function needs to print the bitmapped
2893	* commits, bypass the commit lookup table (if one exists)
2894	* by forcing the bitmap to eagerly load its entries.
2895	*/
2896	if (bitmap_git->table_lookup) {
2897	if (load_bitmap_entries_v1(bitmap_git) < 0)
2898	die(_("failed to load bitmap indexes"));
2899	}
2900
2901	kh_foreach(bitmap_git->bitmaps, oid, value, {
2902	printf_ln("%s", oid_to_hex(&oid));
2903	});
2904
2905	free_bitmap_index(bitmap_git);
2906
2907	return 0;
2908	}
2909
2910	int test_bitmap_commits_with_offset(struct repository *r)
2911	{
2912	struct object_id oid;
2913	struct stored_bitmap *stored;
2914	struct bitmap_index *bitmap_git;
2915	size_t commit_idx_pos_map_pos, xor_offset_map_pos, flag_map_pos,
2916	ewah_bitmap_map_pos;
2917
2918	bitmap_git = prepare_bitmap_git(r);
2919	if (!bitmap_git)
2920	die(_("failed to load bitmap indexes"));
2921
2922	/*
2923	* Since this function needs to know the position of each individual
2924	* bitmap, bypass the commit lookup table (if one exists) by forcing
2925	* the bitmap to eagerly load its entries.
2926	*/
2927	if (bitmap_git->table_lookup) {
2928	if (load_bitmap_entries_v1(bitmap_git) < 0)
2929	die(_("failed to load bitmap indexes"));
2930	}
2931
2932	kh_foreach (bitmap_git->bitmaps, oid, stored, {
2933	commit_idx_pos_map_pos = stored->map_pos;
2934	xor_offset_map_pos = stored->map_pos + sizeof(uint32_t);
2935	flag_map_pos = xor_offset_map_pos + sizeof(uint8_t);
2936	ewah_bitmap_map_pos = flag_map_pos + sizeof(uint8_t);
2937
2938	printf_ln("%s %"PRIuMAX" %"PRIuMAX" %"PRIuMAX" %"PRIuMAX,
2939	oid_to_hex(&oid),
2940	(uintmax_t)commit_idx_pos_map_pos,
2941	(uintmax_t)xor_offset_map_pos,
2942	(uintmax_t)flag_map_pos,
2943	(uintmax_t)ewah_bitmap_map_pos);
2944	})
2945	;
2946
2947	free_bitmap_index(bitmap_git);
2948
2949	return 0;
2950	}
2951
2952	int test_bitmap_hashes(struct repository *r)
2953	{
2954	struct bitmap_index *bitmap_git = prepare_bitmap_git(r);
2955	struct object_id oid;
2956	uint32_t i, index_pos;
2957
2958	if (!bitmap_git \|\| !bitmap_git->hashes)
2959	goto cleanup;
2960
2961	for (i = 0; i < bitmap_num_objects(bitmap_git); i++) {
2962	if (bitmap_is_midx(bitmap_git))
2963	index_pos = pack_pos_to_midx(bitmap_git->midx, i);
2964	else
2965	index_pos = pack_pos_to_index(bitmap_git->pack, i);
2966
2967	nth_bitmap_object_oid(bitmap_git, &oid, index_pos);
2968
2969	printf_ln("%s %"PRIu32"",
2970	oid_to_hex(&oid), get_be32(bitmap_git->hashes + index_pos));
2971	}
2972
2973	cleanup:
2974	free_bitmap_index(bitmap_git);
2975
2976	return 0;
2977	}
2978
2979	static void bit_pos_to_object_id(struct bitmap_index *bitmap_git,
2980	uint32_t bit_pos,
2981	struct object_id *oid)
2982	{
2983	uint32_t index_pos;
2984
2985	if (bitmap_is_midx(bitmap_git))
2986	index_pos = pack_pos_to_midx(bitmap_git->midx, bit_pos);
2987	else
2988	index_pos = pack_pos_to_index(bitmap_git->pack, bit_pos);
2989
2990	nth_bitmap_object_oid(bitmap_git, oid, index_pos);
2991	}
2992
2993	int test_bitmap_pseudo_merges(struct repository *r)
2994	{
2995	struct bitmap_index *bitmap_git;
2996	uint32_t i;
2997
2998	bitmap_git = prepare_bitmap_git(r);
2999	if (!bitmap_git \|\| !bitmap_git->pseudo_merges.nr)
3000	goto cleanup;
3001
3002	for (i = 0; i < bitmap_git->pseudo_merges.nr; i++) {
3003	struct pseudo_merge *merge;
3004	struct ewah_bitmap commits_bitmap, merge_bitmap;
3005
3006	merge = use_pseudo_merge(&bitmap_git->pseudo_merges,
3007	&bitmap_git->pseudo_merges.v[i]);
3008	commits_bitmap = merge->commits;
3009	merge_bitmap = pseudo_merge_bitmap(&bitmap_git->pseudo_merges,
3010	merge);
3011
3012	printf("at=%"PRIuMAX", commits=%"PRIuMAX", objects=%"PRIuMAX"\n",
3013	(uintmax_t)merge->at,
3014	(uintmax_t)ewah_bitmap_popcount(commits_bitmap),
3015	(uintmax_t)ewah_bitmap_popcount(merge_bitmap));
3016	}
3017
3018	cleanup:
3019	free_bitmap_index(bitmap_git);
3020	return 0;
3021	}
3022
3023	static void dump_ewah_object_ids(struct bitmap_index *bitmap_git,
3024	struct ewah_bitmap *bitmap)
3025
3026	{
3027	struct ewah_iterator it;
3028	eword_t word;
3029	uint32_t pos = 0;
3030
3031	ewah_iterator_init(&it, bitmap);
3032
3033	while (ewah_iterator_next(&word, &it)) {
3034	struct object_id oid;
3035	uint32_t offset;
3036
3037	for (offset = 0; offset < BITS_IN_EWORD; offset++) {
3038	if (!(word >> offset))
3039	break;
3040
3041	offset += ewah_bit_ctz64(word >> offset);
3042
3043	bit_pos_to_object_id(bitmap_git, pos + offset, &oid);
3044	printf("%s\n", oid_to_hex(&oid));
3045	}
3046	pos += BITS_IN_EWORD;
3047	}
3048	}
3049
3050	int test_bitmap_pseudo_merge_commits(struct repository *r, uint32_t n)
3051	{
3052	struct bitmap_index *bitmap_git;
3053	struct pseudo_merge *merge;
3054	int ret = 0;
3055
3056	bitmap_git = prepare_bitmap_git(r);
3057	if (!bitmap_git \|\| !bitmap_git->pseudo_merges.nr)
3058	goto cleanup;
3059
3060	if (n >= bitmap_git->pseudo_merges.nr) {
3061	ret = error(_("pseudo-merge index out of range "
3062	"(%"PRIu32" >= %"PRIuMAX")"),
3063	n, (uintmax_t)bitmap_git->pseudo_merges.nr);
3064	goto cleanup;
3065	}
3066
3067	merge = use_pseudo_merge(&bitmap_git->pseudo_merges,
3068	&bitmap_git->pseudo_merges.v[n]);
3069	dump_ewah_object_ids(bitmap_git, merge->commits);
3070
3071	cleanup:
3072	free_bitmap_index(bitmap_git);
3073	return ret;
3074	}
3075
3076	int test_bitmap_pseudo_merge_objects(struct repository *r, uint32_t n)
3077	{
3078	struct bitmap_index *bitmap_git;
3079	struct pseudo_merge *merge;
3080	int ret = 0;
3081
3082	bitmap_git = prepare_bitmap_git(r);
3083	if (!bitmap_git \|\| !bitmap_git->pseudo_merges.nr)
3084	goto cleanup;
3085
3086	if (n >= bitmap_git->pseudo_merges.nr) {
3087	ret = error(_("pseudo-merge index out of range "
3088	"(%"PRIu32" >= %"PRIuMAX")"),
3089	n, (uintmax_t)bitmap_git->pseudo_merges.nr);
3090	goto cleanup;
3091	}
3092
3093	merge = use_pseudo_merge(&bitmap_git->pseudo_merges,
3094	&bitmap_git->pseudo_merges.v[n]);
3095
3096	dump_ewah_object_ids(bitmap_git,
3097	pseudo_merge_bitmap(&bitmap_git->pseudo_merges,
3098	merge));
3099
3100	cleanup:
3101	free_bitmap_index(bitmap_git);
3102	return ret;
3103	}
3104
3105	int rebuild_bitmap(const uint32_t *reposition,
3106	struct ewah_bitmap *source,
3107	struct bitmap *dest)
3108	{
3109	uint32_t pos = 0;
3110	struct ewah_iterator it;
3111	eword_t word;
3112
3113	ewah_iterator_init(&it, source);
3114
3115	while (ewah_iterator_next(&word, &it)) {
3116	uint32_t offset, bit_pos;
3117
3118	for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
3119	if ((word >> offset) == 0)
3120	break;
3121
3122	offset += ewah_bit_ctz64(word >> offset);
3123
3124	bit_pos = reposition[pos + offset];
3125	if (bit_pos > 0)
3126	bitmap_set(dest, bit_pos - 1);
3127	else /* can't reuse, we don't have the object */
3128	return -1;
3129	}
3130
3131	pos += BITS_IN_EWORD;
3132	}
3133	return 0;
3134	}
3135
3136	uint32_t create_bitmap_mapping(struct bitmap_index bitmap_git,
3137	struct packing_data *mapping)
3138	{
3139	struct repository *r = bitmap_repo(bitmap_git);
3140	uint32_t i, num_objects;
3141	uint32_t *reposition;
3142
3143	if (!bitmap_is_midx(bitmap_git))
3144	load_reverse_index(r, bitmap_git);
3145	else if (load_midx_revindex(bitmap_git->midx))
3146	BUG("rebuild_existing_bitmaps: missing required rev-cache "
3147	"extension");
3148
3149	num_objects = bitmap_num_objects_total(bitmap_git);
3150	CALLOC_ARRAY(reposition, num_objects);
3151
3152	for (i = 0; i < num_objects; ++i) {
3153	struct object_id oid;
3154	struct object_entry *oe;
3155	uint32_t index_pos;
3156
3157	if (bitmap_is_midx(bitmap_git))
3158	index_pos = pack_pos_to_midx(bitmap_git->midx, i);
3159	else
3160	index_pos = pack_pos_to_index(bitmap_git->pack, i);
3161	nth_bitmap_object_oid(bitmap_git, &oid, index_pos);
3162	oe = packlist_find(mapping, &oid);
3163
3164	if (oe) {
3165	reposition[i] = oe_in_pack_pos(mapping, oe) + 1;
3166	if (!oe->hash)
3167	oe->hash = bitmap_name_hash(bitmap_git, index_pos);
3168	}
3169	}
3170
3171	return reposition;
3172	}
3173
3174	void free_bitmap_index(struct bitmap_index *b)
3175	{
3176	if (!b)
3177	return;
3178
3179	if (b->map)
3180	munmap(b->map, b->map_size);
3181	ewah_pool_free(b->commits);
3182	ewah_pool_free(b->trees);
3183	ewah_pool_free(b->blobs);
3184	ewah_pool_free(b->tags);
3185	free(b->commits_all);
3186	free(b->trees_all);
3187	free(b->blobs_all);
3188	free(b->tags_all);
3189	if (b->bitmaps) {
3190	struct stored_bitmap *sb;
3191	kh_foreach_value(b->bitmaps, sb, {
3192	ewah_pool_free(sb->root);
3193	free(sb);
3194	});
3195	}
3196	kh_destroy_oid_map(b->bitmaps);
3197	free(b->ext_index.objects);
3198	free(b->ext_index.hashes);
3199	kh_destroy_oid_pos(b->ext_index.positions);
3200	bitmap_free(b->result);
3201	bitmap_free(b->haves);
3202	if (bitmap_is_midx(b)) {
3203	/*
3204	* Multi-pack bitmaps need to have resources associated with
3205	* their on-disk reverse indexes unmapped so that stale .rev and
3206	* .bitmap files can be removed.
3207	*
3208	* Unlike pack-based bitmaps, multi-pack bitmaps can be read and
3209	* written in the same 'git multi-pack-index write --bitmap'
3210	* process. Close resources so they can be removed safely on
3211	* platforms like Windows.
3212	*/
3213	close_midx_revindex(b->midx);
3214	}
3215	free_pseudo_merge_map(&b->pseudo_merges);
3216	free_bitmap_index(b->base);
3217	free(b);
3218	}
3219
3220	int bitmap_has_oid_in_uninteresting(struct bitmap_index *bitmap_git,
3221	const struct object_id *oid)
3222	{
3223	return bitmap_git &&
3224	bitmap_walk_contains(bitmap_git, bitmap_git->haves, oid);
3225	}
3226
3227	static off_t get_disk_usage_for_type(struct bitmap_index *bitmap_git,
3228	enum object_type object_type)
3229	{
3230	struct bitmap *result = bitmap_git->result;
3231	off_t total = 0;
3232	struct ewah_or_iterator it;
3233	eword_t filter;
3234	size_t i;
3235
3236	init_type_iterator(&it, bitmap_git, object_type);
3237	for (i = 0; i < result->word_alloc &&
3238	ewah_or_iterator_next(&filter, &it); i++) {
3239	eword_t word = result->words[i] & filter;
3240	size_t base = (i * BITS_IN_EWORD);
3241	unsigned offset;
3242
3243	if (!word)
3244	continue;
3245
3246	for (offset = 0; offset < BITS_IN_EWORD; offset++) {
3247	if ((word >> offset) == 0)
3248	break;
3249
3250	offset += ewah_bit_ctz64(word >> offset);
3251
3252	if (bitmap_is_midx(bitmap_git)) {
3253	uint32_t pack_pos;
3254	uint32_t midx_pos = pack_pos_to_midx(bitmap_git->midx, base + offset);
3255	off_t offset = nth_midxed_offset(bitmap_git->midx, midx_pos);
3256
3257	uint32_t pack_id = nth_midxed_pack_int_id(bitmap_git->midx, midx_pos);
3258	struct packed_git *pack = nth_midxed_pack(bitmap_git->midx, pack_id);
3259
3260	if (offset_to_pack_pos(pack, offset, &pack_pos) < 0) {
3261	struct object_id oid;
3262	nth_midxed_object_oid(&oid, bitmap_git->midx, midx_pos);
3263
3264	die(_("could not find '%s' in pack '%s' at offset %"PRIuMAX),
3265	oid_to_hex(&oid),
3266	pack->pack_name,
3267	(uintmax_t)offset);
3268	}
3269
3270	total += pack_pos_to_offset(pack, pack_pos + 1) - offset;
3271	} else {
3272	size_t pos = base + offset;
3273	total += pack_pos_to_offset(bitmap_git->pack, pos + 1) -
3274	pack_pos_to_offset(bitmap_git->pack, pos);
3275	}
3276	}
3277	}
3278
3279	ewah_or_iterator_release(&it);
3280
3281	return total;
3282	}
3283
3284	static off_t get_disk_usage_for_extended(struct bitmap_index *bitmap_git)
3285	{
3286	struct bitmap *result = bitmap_git->result;
3287	struct eindex *eindex = &bitmap_git->ext_index;
3288	off_t total = 0;
3289	struct object_info oi = OBJECT_INFO_INIT;
3290	off_t object_size;
3291	size_t i;
3292
3293	oi.disk_sizep = &object_size;
3294
3295	for (i = 0; i < eindex->count; i++) {
3296	struct object *obj = eindex->objects[i];
3297
3298	if (!bitmap_get(result,
3299	st_add(bitmap_num_objects_total(bitmap_git),
3300	i)))
3301	continue;
3302
3303	if (odb_read_object_info_extended(bitmap_repo(bitmap_git)->objects,
3304	&obj->oid, &oi, 0) < 0)
3305	die(_("unable to get disk usage of '%s'"),
3306	oid_to_hex(&obj->oid));
3307
3308	total += object_size;
3309	}
3310	return total;
3311	}
3312
3313	off_t get_disk_usage_from_bitmap(struct bitmap_index *bitmap_git,
3314	struct rev_info *revs)
3315	{
3316	off_t total = 0;
3317
3318	total += get_disk_usage_for_type(bitmap_git, OBJ_COMMIT);
3319	if (revs->tree_objects)
3320	total += get_disk_usage_for_type(bitmap_git, OBJ_TREE);
3321	if (revs->blob_objects)
3322	total += get_disk_usage_for_type(bitmap_git, OBJ_BLOB);
3323	if (revs->tag_objects)
3324	total += get_disk_usage_for_type(bitmap_git, OBJ_TAG);
3325
3326	total += get_disk_usage_for_extended(bitmap_git);
3327
3328	return total;
3329	}
3330
3331	int bitmap_is_midx(struct bitmap_index *bitmap_git)
3332	{
3333	return !!bitmap_git->midx;
3334	}
3335
3336	static const struct string_list bitmap_preferred_tips(struct repository r)
3337	{
3338	const struct string_list *dest;
3339
3340	if (!repo_config_get_string_multi(r, "pack.preferbitmaptips", &dest))
3341	return dest;
3342	return NULL;
3343	}
3344
3345	void for_each_preferred_bitmap_tip(struct repository *repo,
3346	refs_for_each_cb cb, void *cb_data)
3347	{
3348	struct refs_for_each_ref_options opts = { 0 };
3349	struct string_list_item *item;
3350	const struct string_list *preferred_tips;
3351	struct strbuf buf = STRBUF_INIT;
3352
3353	preferred_tips = bitmap_preferred_tips(repo);
3354	if (!preferred_tips)
3355	return;
3356
3357	for_each_string_list_item(item, preferred_tips) {
3358	opts.prefix = item->string;
3359
3360	if (!ends_with(opts.prefix, "/")) {
3361	strbuf_reset(&buf);
3362	strbuf_addf(&buf, "%s/", opts.prefix);
3363	opts.prefix = buf.buf;
3364	}
3365
3366	refs_for_each_ref_ext(get_main_ref_store(repo),
3367	cb, cb_data, &opts);
3368	}
3369
3370	strbuf_release(&buf);
3371	}
3372
3373	int bitmap_is_preferred_refname(struct repository r, const char refname)
3374	{
3375	const struct string_list *preferred_tips = bitmap_preferred_tips(r);
3376	struct string_list_item *item;
3377
3378	if (!preferred_tips)
3379	return 0;
3380
3381	for_each_string_list_item(item, preferred_tips) {
3382	if (starts_with(refname, item->string))
3383	return 1;
3384	}
3385
3386	return 0;
3387	}
3388
3389	static int verify_bitmap_file(const struct git_hash_algo *algop,
3390	const char *name)
3391	{
3392	struct stat st;
3393	unsigned char *data;
3394	int fd = git_open(name);
3395	int res = 0;
3396
3397	/* It is OK to not have the file. */
3398	if (fd < 0 \|\| fstat(fd, &st)) {
3399	if (fd >= 0)
3400	close(fd);
3401	return 0;
3402	}
3403
3404	data = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
3405	close(fd);
3406	if (!hashfile_checksum_valid(algop, data, st.st_size))
3407	res = error(_("bitmap file '%s' has invalid checksum"),
3408	name);
3409
3410	munmap(data, st.st_size);
3411	return res;
3412	}
3413
3414	int verify_bitmap_files(struct repository *r)
3415	{
3416	struct odb_source *source;
3417	struct packed_git *p;
3418	int res = 0;
3419
3420	odb_prepare_alternates(r->objects);
3421	for (source = r->objects->sources; source; source = source->next) {
3422	struct odb_source_files *files = odb_source_files_downcast(source);
3423	struct multi_pack_index *m = get_multi_pack_index(files->packed);
3424	char *midx_bitmap_name;
3425
3426	if (!m)
3427	continue;
3428
3429	midx_bitmap_name = midx_bitmap_filename(m);
3430	res \|= verify_bitmap_file(r->hash_algo, midx_bitmap_name);
3431	free(midx_bitmap_name);
3432	}
3433
3434	repo_for_each_pack(r, p) {
3435	char *pack_bitmap_name = pack_bitmap_filename(p);
3436	res \|= verify_bitmap_file(r->hash_algo, pack_bitmap_name);
3437	free(pack_bitmap_name);
3438	}
3439
3440	return res;
3441	}