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1 | #include "cache.h" | |
2 | #include "commit.h" | |
3 | #include "tag.h" | |
4 | #include "diff.h" | |
5 | #include "revision.h" | |
6 | #include "progress.h" | |
7 | #include "list-objects.h" | |
8 | #include "pack.h" | |
9 | #include "pack-bitmap.h" | |
10 | #include "pack-revindex.h" | |
11 | #include "pack-objects.h" | |
12 | #include "packfile.h" | |
13 | #include "repository.h" | |
14 | #include "object-store.h" | |
15 | ||
16 | /* | |
17 | * An entry on the bitmap index, representing the bitmap for a given | |
18 | * commit. | |
19 | */ | |
20 | struct stored_bitmap { | |
21 | struct object_id oid; | |
22 | struct ewah_bitmap *root; | |
23 | struct stored_bitmap *xor; | |
24 | int flags; | |
25 | }; | |
26 | ||
27 | /* | |
28 | * The active bitmap index for a repository. By design, repositories only have | |
29 | * a single bitmap index available (the index for the biggest packfile in | |
30 | * the repository), since bitmap indexes need full closure. | |
31 | * | |
32 | * If there is more than one bitmap index available (e.g. because of alternates), | |
33 | * the active bitmap index is the largest one. | |
34 | */ | |
35 | struct bitmap_index { | |
36 | /* Packfile to which this bitmap index belongs to */ | |
37 | struct packed_git *pack; | |
38 | ||
39 | /* | |
40 | * Mark the first `reuse_objects` in the packfile as reused: | |
41 | * they will be sent as-is without using them for repacking | |
42 | * calculations | |
43 | */ | |
44 | uint32_t reuse_objects; | |
45 | ||
46 | /* mmapped buffer of the whole bitmap index */ | |
47 | unsigned char *map; | |
48 | size_t map_size; /* size of the mmaped buffer */ | |
49 | size_t map_pos; /* current position when loading the index */ | |
50 | ||
51 | /* | |
52 | * Type indexes. | |
53 | * | |
54 | * Each bitmap marks which objects in the packfile are of the given | |
55 | * type. This provides type information when yielding the objects from | |
56 | * the packfile during a walk, which allows for better delta bases. | |
57 | */ | |
58 | struct ewah_bitmap *commits; | |
59 | struct ewah_bitmap *trees; | |
60 | struct ewah_bitmap *blobs; | |
61 | struct ewah_bitmap *tags; | |
62 | ||
63 | /* Map from object ID -> `stored_bitmap` for all the bitmapped commits */ | |
64 | kh_oid_map_t *bitmaps; | |
65 | ||
66 | /* Number of bitmapped commits */ | |
67 | uint32_t entry_count; | |
68 | ||
69 | /* If not NULL, this is a name-hash cache pointing into map. */ | |
70 | uint32_t *hashes; | |
71 | ||
72 | /* | |
73 | * Extended index. | |
74 | * | |
75 | * When trying to perform bitmap operations with objects that are not | |
76 | * packed in `pack`, these objects are added to this "fake index" and | |
77 | * are assumed to appear at the end of the packfile for all operations | |
78 | */ | |
79 | struct eindex { | |
80 | struct object **objects; | |
81 | uint32_t *hashes; | |
82 | uint32_t count, alloc; | |
83 | kh_oid_pos_t *positions; | |
84 | } ext_index; | |
85 | ||
86 | /* Bitmap result of the last performed walk */ | |
87 | struct bitmap *result; | |
88 | ||
89 | /* "have" bitmap from the last performed walk */ | |
90 | struct bitmap *haves; | |
91 | ||
92 | /* Version of the bitmap index */ | |
93 | unsigned int version; | |
94 | }; | |
95 | ||
96 | static struct ewah_bitmap *lookup_stored_bitmap(struct stored_bitmap *st) | |
97 | { | |
98 | struct ewah_bitmap *parent; | |
99 | struct ewah_bitmap *composed; | |
100 | ||
101 | if (st->xor == NULL) | |
102 | return st->root; | |
103 | ||
104 | composed = ewah_pool_new(); | |
105 | parent = lookup_stored_bitmap(st->xor); | |
106 | ewah_xor(st->root, parent, composed); | |
107 | ||
108 | ewah_pool_free(st->root); | |
109 | st->root = composed; | |
110 | st->xor = NULL; | |
111 | ||
112 | return composed; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Read a bitmap from the current read position on the mmaped | |
117 | * index, and increase the read position accordingly | |
118 | */ | |
119 | static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index) | |
120 | { | |
121 | struct ewah_bitmap *b = ewah_pool_new(); | |
122 | ||
123 | ssize_t bitmap_size = ewah_read_mmap(b, | |
124 | index->map + index->map_pos, | |
125 | index->map_size - index->map_pos); | |
126 | ||
127 | if (bitmap_size < 0) { | |
128 | error("Failed to load bitmap index (corrupted?)"); | |
129 | ewah_pool_free(b); | |
130 | return NULL; | |
131 | } | |
132 | ||
133 | index->map_pos += bitmap_size; | |
134 | return b; | |
135 | } | |
136 | ||
137 | static int load_bitmap_header(struct bitmap_index *index) | |
138 | { | |
139 | struct bitmap_disk_header *header = (void *)index->map; | |
140 | ||
141 | if (index->map_size < sizeof(*header) + the_hash_algo->rawsz) | |
142 | return error("Corrupted bitmap index (missing header data)"); | |
143 | ||
144 | if (memcmp(header->magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE)) != 0) | |
145 | return error("Corrupted bitmap index file (wrong header)"); | |
146 | ||
147 | index->version = ntohs(header->version); | |
148 | if (index->version != 1) | |
149 | return error("Unsupported version for bitmap index file (%d)", index->version); | |
150 | ||
151 | /* Parse known bitmap format options */ | |
152 | { | |
153 | uint32_t flags = ntohs(header->options); | |
154 | ||
155 | if ((flags & BITMAP_OPT_FULL_DAG) == 0) | |
156 | return error("Unsupported options for bitmap index file " | |
157 | "(Git requires BITMAP_OPT_FULL_DAG)"); | |
158 | ||
159 | if (flags & BITMAP_OPT_HASH_CACHE) { | |
160 | unsigned char *end = index->map + index->map_size - the_hash_algo->rawsz; | |
161 | index->hashes = ((uint32_t *)end) - index->pack->num_objects; | |
162 | } | |
163 | } | |
164 | ||
165 | index->entry_count = ntohl(header->entry_count); | |
166 | index->map_pos += sizeof(*header) - GIT_MAX_RAWSZ + the_hash_algo->rawsz; | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static struct stored_bitmap *store_bitmap(struct bitmap_index *index, | |
171 | struct ewah_bitmap *root, | |
172 | const unsigned char *hash, | |
173 | struct stored_bitmap *xor_with, | |
174 | int flags) | |
175 | { | |
176 | struct stored_bitmap *stored; | |
177 | khiter_t hash_pos; | |
178 | int ret; | |
179 | ||
180 | stored = xmalloc(sizeof(struct stored_bitmap)); | |
181 | stored->root = root; | |
182 | stored->xor = xor_with; | |
183 | stored->flags = flags; | |
184 | oidread(&stored->oid, hash); | |
185 | ||
186 | hash_pos = kh_put_oid_map(index->bitmaps, stored->oid, &ret); | |
187 | ||
188 | /* a 0 return code means the insertion succeeded with no changes, | |
189 | * because the SHA1 already existed on the map. this is bad, there | |
190 | * shouldn't be duplicated commits in the index */ | |
191 | if (ret == 0) { | |
192 | error("Duplicate entry in bitmap index: %s", hash_to_hex(hash)); | |
193 | return NULL; | |
194 | } | |
195 | ||
196 | kh_value(index->bitmaps, hash_pos) = stored; | |
197 | return stored; | |
198 | } | |
199 | ||
200 | static inline uint32_t read_be32(const unsigned char *buffer, size_t *pos) | |
201 | { | |
202 | uint32_t result = get_be32(buffer + *pos); | |
203 | (*pos) += sizeof(result); | |
204 | return result; | |
205 | } | |
206 | ||
207 | static inline uint8_t read_u8(const unsigned char *buffer, size_t *pos) | |
208 | { | |
209 | return buffer[(*pos)++]; | |
210 | } | |
211 | ||
212 | #define MAX_XOR_OFFSET 160 | |
213 | ||
214 | static int load_bitmap_entries_v1(struct bitmap_index *index) | |
215 | { | |
216 | uint32_t i; | |
217 | struct stored_bitmap *recent_bitmaps[MAX_XOR_OFFSET] = { NULL }; | |
218 | ||
219 | for (i = 0; i < index->entry_count; ++i) { | |
220 | int xor_offset, flags; | |
221 | struct ewah_bitmap *bitmap = NULL; | |
222 | struct stored_bitmap *xor_bitmap = NULL; | |
223 | uint32_t commit_idx_pos; | |
224 | const unsigned char *sha1; | |
225 | ||
226 | commit_idx_pos = read_be32(index->map, &index->map_pos); | |
227 | xor_offset = read_u8(index->map, &index->map_pos); | |
228 | flags = read_u8(index->map, &index->map_pos); | |
229 | ||
230 | sha1 = nth_packed_object_sha1(index->pack, commit_idx_pos); | |
231 | ||
232 | bitmap = read_bitmap_1(index); | |
233 | if (!bitmap) | |
234 | return -1; | |
235 | ||
236 | if (xor_offset > MAX_XOR_OFFSET || xor_offset > i) | |
237 | return error("Corrupted bitmap pack index"); | |
238 | ||
239 | if (xor_offset > 0) { | |
240 | xor_bitmap = recent_bitmaps[(i - xor_offset) % MAX_XOR_OFFSET]; | |
241 | ||
242 | if (xor_bitmap == NULL) | |
243 | return error("Invalid XOR offset in bitmap pack index"); | |
244 | } | |
245 | ||
246 | recent_bitmaps[i % MAX_XOR_OFFSET] = store_bitmap( | |
247 | index, bitmap, sha1, xor_bitmap, flags); | |
248 | } | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | static char *pack_bitmap_filename(struct packed_git *p) | |
254 | { | |
255 | size_t len; | |
256 | ||
257 | if (!strip_suffix(p->pack_name, ".pack", &len)) | |
258 | BUG("pack_name does not end in .pack"); | |
259 | return xstrfmt("%.*s.bitmap", (int)len, p->pack_name); | |
260 | } | |
261 | ||
262 | static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git *packfile) | |
263 | { | |
264 | int fd; | |
265 | struct stat st; | |
266 | char *idx_name; | |
267 | ||
268 | if (open_pack_index(packfile)) | |
269 | return -1; | |
270 | ||
271 | idx_name = pack_bitmap_filename(packfile); | |
272 | fd = git_open(idx_name); | |
273 | free(idx_name); | |
274 | ||
275 | if (fd < 0) | |
276 | return -1; | |
277 | ||
278 | if (fstat(fd, &st)) { | |
279 | close(fd); | |
280 | return -1; | |
281 | } | |
282 | ||
283 | if (bitmap_git->pack) { | |
284 | warning("ignoring extra bitmap file: %s", packfile->pack_name); | |
285 | close(fd); | |
286 | return -1; | |
287 | } | |
288 | ||
289 | bitmap_git->pack = packfile; | |
290 | bitmap_git->map_size = xsize_t(st.st_size); | |
291 | bitmap_git->map = xmmap(NULL, bitmap_git->map_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
292 | bitmap_git->map_pos = 0; | |
293 | close(fd); | |
294 | ||
295 | if (load_bitmap_header(bitmap_git) < 0) { | |
296 | munmap(bitmap_git->map, bitmap_git->map_size); | |
297 | bitmap_git->map = NULL; | |
298 | bitmap_git->map_size = 0; | |
299 | return -1; | |
300 | } | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static int load_pack_bitmap(struct bitmap_index *bitmap_git) | |
306 | { | |
307 | assert(bitmap_git->map); | |
308 | ||
309 | bitmap_git->bitmaps = kh_init_oid_map(); | |
310 | bitmap_git->ext_index.positions = kh_init_oid_pos(); | |
311 | if (load_pack_revindex(bitmap_git->pack)) | |
312 | goto failed; | |
313 | ||
314 | if (!(bitmap_git->commits = read_bitmap_1(bitmap_git)) || | |
315 | !(bitmap_git->trees = read_bitmap_1(bitmap_git)) || | |
316 | !(bitmap_git->blobs = read_bitmap_1(bitmap_git)) || | |
317 | !(bitmap_git->tags = read_bitmap_1(bitmap_git))) | |
318 | goto failed; | |
319 | ||
320 | if (load_bitmap_entries_v1(bitmap_git) < 0) | |
321 | goto failed; | |
322 | ||
323 | return 0; | |
324 | ||
325 | failed: | |
326 | munmap(bitmap_git->map, bitmap_git->map_size); | |
327 | bitmap_git->map = NULL; | |
328 | bitmap_git->map_size = 0; | |
329 | return -1; | |
330 | } | |
331 | ||
332 | static int open_pack_bitmap(struct repository *r, | |
333 | struct bitmap_index *bitmap_git) | |
334 | { | |
335 | struct packed_git *p; | |
336 | int ret = -1; | |
337 | ||
338 | assert(!bitmap_git->map); | |
339 | ||
340 | for (p = get_all_packs(r); p; p = p->next) { | |
341 | if (open_pack_bitmap_1(bitmap_git, p) == 0) | |
342 | ret = 0; | |
343 | } | |
344 | ||
345 | return ret; | |
346 | } | |
347 | ||
348 | struct bitmap_index *prepare_bitmap_git(struct repository *r) | |
349 | { | |
350 | struct bitmap_index *bitmap_git = xcalloc(1, sizeof(*bitmap_git)); | |
351 | ||
352 | if (!open_pack_bitmap(r, bitmap_git) && !load_pack_bitmap(bitmap_git)) | |
353 | return bitmap_git; | |
354 | ||
355 | free_bitmap_index(bitmap_git); | |
356 | return NULL; | |
357 | } | |
358 | ||
359 | struct include_data { | |
360 | struct bitmap_index *bitmap_git; | |
361 | struct bitmap *base; | |
362 | struct bitmap *seen; | |
363 | }; | |
364 | ||
365 | static inline int bitmap_position_extended(struct bitmap_index *bitmap_git, | |
366 | const struct object_id *oid) | |
367 | { | |
368 | khash_oid_pos *positions = bitmap_git->ext_index.positions; | |
369 | khiter_t pos = kh_get_oid_pos(positions, *oid); | |
370 | ||
371 | if (pos < kh_end(positions)) { | |
372 | int bitmap_pos = kh_value(positions, pos); | |
373 | return bitmap_pos + bitmap_git->pack->num_objects; | |
374 | } | |
375 | ||
376 | return -1; | |
377 | } | |
378 | ||
379 | static inline int bitmap_position_packfile(struct bitmap_index *bitmap_git, | |
380 | const struct object_id *oid) | |
381 | { | |
382 | off_t offset = find_pack_entry_one(oid->hash, bitmap_git->pack); | |
383 | if (!offset) | |
384 | return -1; | |
385 | ||
386 | return find_revindex_position(bitmap_git->pack, offset); | |
387 | } | |
388 | ||
389 | static int bitmap_position(struct bitmap_index *bitmap_git, | |
390 | const struct object_id *oid) | |
391 | { | |
392 | int pos = bitmap_position_packfile(bitmap_git, oid); | |
393 | return (pos >= 0) ? pos : bitmap_position_extended(bitmap_git, oid); | |
394 | } | |
395 | ||
396 | static int ext_index_add_object(struct bitmap_index *bitmap_git, | |
397 | struct object *object, const char *name) | |
398 | { | |
399 | struct eindex *eindex = &bitmap_git->ext_index; | |
400 | ||
401 | khiter_t hash_pos; | |
402 | int hash_ret; | |
403 | int bitmap_pos; | |
404 | ||
405 | hash_pos = kh_put_oid_pos(eindex->positions, object->oid, &hash_ret); | |
406 | if (hash_ret > 0) { | |
407 | if (eindex->count >= eindex->alloc) { | |
408 | eindex->alloc = (eindex->alloc + 16) * 3 / 2; | |
409 | REALLOC_ARRAY(eindex->objects, eindex->alloc); | |
410 | REALLOC_ARRAY(eindex->hashes, eindex->alloc); | |
411 | } | |
412 | ||
413 | bitmap_pos = eindex->count; | |
414 | eindex->objects[eindex->count] = object; | |
415 | eindex->hashes[eindex->count] = pack_name_hash(name); | |
416 | kh_value(eindex->positions, hash_pos) = bitmap_pos; | |
417 | eindex->count++; | |
418 | } else { | |
419 | bitmap_pos = kh_value(eindex->positions, hash_pos); | |
420 | } | |
421 | ||
422 | return bitmap_pos + bitmap_git->pack->num_objects; | |
423 | } | |
424 | ||
425 | struct bitmap_show_data { | |
426 | struct bitmap_index *bitmap_git; | |
427 | struct bitmap *base; | |
428 | }; | |
429 | ||
430 | static void show_object(struct object *object, const char *name, void *data_) | |
431 | { | |
432 | struct bitmap_show_data *data = data_; | |
433 | int bitmap_pos; | |
434 | ||
435 | bitmap_pos = bitmap_position(data->bitmap_git, &object->oid); | |
436 | ||
437 | if (bitmap_pos < 0) | |
438 | bitmap_pos = ext_index_add_object(data->bitmap_git, object, | |
439 | name); | |
440 | ||
441 | bitmap_set(data->base, bitmap_pos); | |
442 | } | |
443 | ||
444 | static void show_commit(struct commit *commit, void *data) | |
445 | { | |
446 | } | |
447 | ||
448 | static int add_to_include_set(struct bitmap_index *bitmap_git, | |
449 | struct include_data *data, | |
450 | const struct object_id *oid, | |
451 | int bitmap_pos) | |
452 | { | |
453 | khiter_t hash_pos; | |
454 | ||
455 | if (data->seen && bitmap_get(data->seen, bitmap_pos)) | |
456 | return 0; | |
457 | ||
458 | if (bitmap_get(data->base, bitmap_pos)) | |
459 | return 0; | |
460 | ||
461 | hash_pos = kh_get_oid_map(bitmap_git->bitmaps, *oid); | |
462 | if (hash_pos < kh_end(bitmap_git->bitmaps)) { | |
463 | struct stored_bitmap *st = kh_value(bitmap_git->bitmaps, hash_pos); | |
464 | bitmap_or_ewah(data->base, lookup_stored_bitmap(st)); | |
465 | return 0; | |
466 | } | |
467 | ||
468 | bitmap_set(data->base, bitmap_pos); | |
469 | return 1; | |
470 | } | |
471 | ||
472 | static int should_include(struct commit *commit, void *_data) | |
473 | { | |
474 | struct include_data *data = _data; | |
475 | int bitmap_pos; | |
476 | ||
477 | bitmap_pos = bitmap_position(data->bitmap_git, &commit->object.oid); | |
478 | if (bitmap_pos < 0) | |
479 | bitmap_pos = ext_index_add_object(data->bitmap_git, | |
480 | (struct object *)commit, | |
481 | NULL); | |
482 | ||
483 | if (!add_to_include_set(data->bitmap_git, data, &commit->object.oid, | |
484 | bitmap_pos)) { | |
485 | struct commit_list *parent = commit->parents; | |
486 | ||
487 | while (parent) { | |
488 | parent->item->object.flags |= SEEN; | |
489 | parent = parent->next; | |
490 | } | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | return 1; | |
496 | } | |
497 | ||
498 | static struct bitmap *find_objects(struct bitmap_index *bitmap_git, | |
499 | struct rev_info *revs, | |
500 | struct object_list *roots, | |
501 | struct bitmap *seen) | |
502 | { | |
503 | struct bitmap *base = NULL; | |
504 | int needs_walk = 0; | |
505 | ||
506 | struct object_list *not_mapped = NULL; | |
507 | ||
508 | /* | |
509 | * Go through all the roots for the walk. The ones that have bitmaps | |
510 | * on the bitmap index will be `or`ed together to form an initial | |
511 | * global reachability analysis. | |
512 | * | |
513 | * The ones without bitmaps in the index will be stored in the | |
514 | * `not_mapped_list` for further processing. | |
515 | */ | |
516 | while (roots) { | |
517 | struct object *object = roots->item; | |
518 | roots = roots->next; | |
519 | ||
520 | if (object->type == OBJ_COMMIT) { | |
521 | khiter_t pos = kh_get_oid_map(bitmap_git->bitmaps, object->oid); | |
522 | ||
523 | if (pos < kh_end(bitmap_git->bitmaps)) { | |
524 | struct stored_bitmap *st = kh_value(bitmap_git->bitmaps, pos); | |
525 | struct ewah_bitmap *or_with = lookup_stored_bitmap(st); | |
526 | ||
527 | if (base == NULL) | |
528 | base = ewah_to_bitmap(or_with); | |
529 | else | |
530 | bitmap_or_ewah(base, or_with); | |
531 | ||
532 | object->flags |= SEEN; | |
533 | continue; | |
534 | } | |
535 | } | |
536 | ||
537 | object_list_insert(object, ¬_mapped); | |
538 | } | |
539 | ||
540 | /* | |
541 | * Best case scenario: We found bitmaps for all the roots, | |
542 | * so the resulting `or` bitmap has the full reachability analysis | |
543 | */ | |
544 | if (not_mapped == NULL) | |
545 | return base; | |
546 | ||
547 | roots = not_mapped; | |
548 | ||
549 | /* | |
550 | * Let's iterate through all the roots that don't have bitmaps to | |
551 | * check if we can determine them to be reachable from the existing | |
552 | * global bitmap. | |
553 | * | |
554 | * If we cannot find them in the existing global bitmap, we'll need | |
555 | * to push them to an actual walk and run it until we can confirm | |
556 | * they are reachable | |
557 | */ | |
558 | while (roots) { | |
559 | struct object *object = roots->item; | |
560 | int pos; | |
561 | ||
562 | roots = roots->next; | |
563 | pos = bitmap_position(bitmap_git, &object->oid); | |
564 | ||
565 | if (pos < 0 || base == NULL || !bitmap_get(base, pos)) { | |
566 | object->flags &= ~UNINTERESTING; | |
567 | add_pending_object(revs, object, ""); | |
568 | needs_walk = 1; | |
569 | } else { | |
570 | object->flags |= SEEN; | |
571 | } | |
572 | } | |
573 | ||
574 | if (needs_walk) { | |
575 | struct include_data incdata; | |
576 | struct bitmap_show_data show_data; | |
577 | ||
578 | if (base == NULL) | |
579 | base = bitmap_new(); | |
580 | ||
581 | incdata.bitmap_git = bitmap_git; | |
582 | incdata.base = base; | |
583 | incdata.seen = seen; | |
584 | ||
585 | revs->include_check = should_include; | |
586 | revs->include_check_data = &incdata; | |
587 | ||
588 | if (prepare_revision_walk(revs)) | |
589 | die("revision walk setup failed"); | |
590 | ||
591 | show_data.bitmap_git = bitmap_git; | |
592 | show_data.base = base; | |
593 | ||
594 | traverse_commit_list(revs, show_commit, show_object, | |
595 | &show_data); | |
596 | } | |
597 | ||
598 | return base; | |
599 | } | |
600 | ||
601 | static void show_extended_objects(struct bitmap_index *bitmap_git, | |
602 | show_reachable_fn show_reach) | |
603 | { | |
604 | struct bitmap *objects = bitmap_git->result; | |
605 | struct eindex *eindex = &bitmap_git->ext_index; | |
606 | uint32_t i; | |
607 | ||
608 | for (i = 0; i < eindex->count; ++i) { | |
609 | struct object *obj; | |
610 | ||
611 | if (!bitmap_get(objects, bitmap_git->pack->num_objects + i)) | |
612 | continue; | |
613 | ||
614 | obj = eindex->objects[i]; | |
615 | show_reach(&obj->oid, obj->type, 0, eindex->hashes[i], NULL, 0); | |
616 | } | |
617 | } | |
618 | ||
619 | static void show_objects_for_type( | |
620 | struct bitmap_index *bitmap_git, | |
621 | struct ewah_bitmap *type_filter, | |
622 | enum object_type object_type, | |
623 | show_reachable_fn show_reach) | |
624 | { | |
625 | size_t pos = 0, i = 0; | |
626 | uint32_t offset; | |
627 | ||
628 | struct ewah_iterator it; | |
629 | eword_t filter; | |
630 | ||
631 | struct bitmap *objects = bitmap_git->result; | |
632 | ||
633 | if (bitmap_git->reuse_objects == bitmap_git->pack->num_objects) | |
634 | return; | |
635 | ||
636 | ewah_iterator_init(&it, type_filter); | |
637 | ||
638 | while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) { | |
639 | eword_t word = objects->words[i] & filter; | |
640 | ||
641 | for (offset = 0; offset < BITS_IN_EWORD; ++offset) { | |
642 | struct object_id oid; | |
643 | struct revindex_entry *entry; | |
644 | uint32_t hash = 0; | |
645 | ||
646 | if ((word >> offset) == 0) | |
647 | break; | |
648 | ||
649 | offset += ewah_bit_ctz64(word >> offset); | |
650 | ||
651 | if (pos + offset < bitmap_git->reuse_objects) | |
652 | continue; | |
653 | ||
654 | entry = &bitmap_git->pack->revindex[pos + offset]; | |
655 | nth_packed_object_oid(&oid, bitmap_git->pack, entry->nr); | |
656 | ||
657 | if (bitmap_git->hashes) | |
658 | hash = get_be32(bitmap_git->hashes + entry->nr); | |
659 | ||
660 | show_reach(&oid, object_type, 0, hash, bitmap_git->pack, entry->offset); | |
661 | } | |
662 | ||
663 | pos += BITS_IN_EWORD; | |
664 | i++; | |
665 | } | |
666 | } | |
667 | ||
668 | static int in_bitmapped_pack(struct bitmap_index *bitmap_git, | |
669 | struct object_list *roots) | |
670 | { | |
671 | while (roots) { | |
672 | struct object *object = roots->item; | |
673 | roots = roots->next; | |
674 | ||
675 | if (find_pack_entry_one(object->oid.hash, bitmap_git->pack) > 0) | |
676 | return 1; | |
677 | } | |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
682 | struct bitmap_index *prepare_bitmap_walk(struct rev_info *revs) | |
683 | { | |
684 | unsigned int i; | |
685 | ||
686 | struct object_list *wants = NULL; | |
687 | struct object_list *haves = NULL; | |
688 | ||
689 | struct bitmap *wants_bitmap = NULL; | |
690 | struct bitmap *haves_bitmap = NULL; | |
691 | ||
692 | struct bitmap_index *bitmap_git = xcalloc(1, sizeof(*bitmap_git)); | |
693 | /* try to open a bitmapped pack, but don't parse it yet | |
694 | * because we may not need to use it */ | |
695 | if (open_pack_bitmap(revs->repo, bitmap_git) < 0) | |
696 | goto cleanup; | |
697 | ||
698 | for (i = 0; i < revs->pending.nr; ++i) { | |
699 | struct object *object = revs->pending.objects[i].item; | |
700 | ||
701 | if (object->type == OBJ_NONE) | |
702 | parse_object_or_die(&object->oid, NULL); | |
703 | ||
704 | while (object->type == OBJ_TAG) { | |
705 | struct tag *tag = (struct tag *) object; | |
706 | ||
707 | if (object->flags & UNINTERESTING) | |
708 | object_list_insert(object, &haves); | |
709 | else | |
710 | object_list_insert(object, &wants); | |
711 | ||
712 | if (!tag->tagged) | |
713 | die("bad tag"); | |
714 | object = parse_object_or_die(&tag->tagged->oid, NULL); | |
715 | } | |
716 | ||
717 | if (object->flags & UNINTERESTING) | |
718 | object_list_insert(object, &haves); | |
719 | else | |
720 | object_list_insert(object, &wants); | |
721 | } | |
722 | ||
723 | /* | |
724 | * if we have a HAVES list, but none of those haves is contained | |
725 | * in the packfile that has a bitmap, we don't have anything to | |
726 | * optimize here | |
727 | */ | |
728 | if (haves && !in_bitmapped_pack(bitmap_git, haves)) | |
729 | goto cleanup; | |
730 | ||
731 | /* if we don't want anything, we're done here */ | |
732 | if (!wants) | |
733 | goto cleanup; | |
734 | ||
735 | /* | |
736 | * now we're going to use bitmaps, so load the actual bitmap entries | |
737 | * from disk. this is the point of no return; after this the rev_list | |
738 | * becomes invalidated and we must perform the revwalk through bitmaps | |
739 | */ | |
740 | if (load_pack_bitmap(bitmap_git) < 0) | |
741 | goto cleanup; | |
742 | ||
743 | object_array_clear(&revs->pending); | |
744 | ||
745 | if (haves) { | |
746 | revs->ignore_missing_links = 1; | |
747 | haves_bitmap = find_objects(bitmap_git, revs, haves, NULL); | |
748 | reset_revision_walk(); | |
749 | revs->ignore_missing_links = 0; | |
750 | ||
751 | if (haves_bitmap == NULL) | |
752 | BUG("failed to perform bitmap walk"); | |
753 | } | |
754 | ||
755 | wants_bitmap = find_objects(bitmap_git, revs, wants, haves_bitmap); | |
756 | ||
757 | if (!wants_bitmap) | |
758 | BUG("failed to perform bitmap walk"); | |
759 | ||
760 | if (haves_bitmap) | |
761 | bitmap_and_not(wants_bitmap, haves_bitmap); | |
762 | ||
763 | bitmap_git->result = wants_bitmap; | |
764 | bitmap_git->haves = haves_bitmap; | |
765 | ||
766 | return bitmap_git; | |
767 | ||
768 | cleanup: | |
769 | free_bitmap_index(bitmap_git); | |
770 | return NULL; | |
771 | } | |
772 | ||
773 | int reuse_partial_packfile_from_bitmap(struct bitmap_index *bitmap_git, | |
774 | struct packed_git **packfile, | |
775 | uint32_t *entries, | |
776 | off_t *up_to) | |
777 | { | |
778 | /* | |
779 | * Reuse the packfile content if we need more than | |
780 | * 90% of its objects | |
781 | */ | |
782 | static const double REUSE_PERCENT = 0.9; | |
783 | ||
784 | struct bitmap *result = bitmap_git->result; | |
785 | uint32_t reuse_threshold; | |
786 | uint32_t i, reuse_objects = 0; | |
787 | ||
788 | assert(result); | |
789 | ||
790 | for (i = 0; i < result->word_alloc; ++i) { | |
791 | if (result->words[i] != (eword_t)~0) { | |
792 | reuse_objects += ewah_bit_ctz64(~result->words[i]); | |
793 | break; | |
794 | } | |
795 | ||
796 | reuse_objects += BITS_IN_EWORD; | |
797 | } | |
798 | ||
799 | #ifdef GIT_BITMAP_DEBUG | |
800 | { | |
801 | const unsigned char *sha1; | |
802 | struct revindex_entry *entry; | |
803 | ||
804 | entry = &bitmap_git->reverse_index->revindex[reuse_objects]; | |
805 | sha1 = nth_packed_object_sha1(bitmap_git->pack, entry->nr); | |
806 | ||
807 | fprintf(stderr, "Failed to reuse at %d (%016llx)\n", | |
808 | reuse_objects, result->words[i]); | |
809 | fprintf(stderr, " %s\n", hash_to_hex(sha1)); | |
810 | } | |
811 | #endif | |
812 | ||
813 | if (!reuse_objects) | |
814 | return -1; | |
815 | ||
816 | if (reuse_objects >= bitmap_git->pack->num_objects) { | |
817 | bitmap_git->reuse_objects = *entries = bitmap_git->pack->num_objects; | |
818 | *up_to = -1; /* reuse the full pack */ | |
819 | *packfile = bitmap_git->pack; | |
820 | return 0; | |
821 | } | |
822 | ||
823 | reuse_threshold = bitmap_popcount(bitmap_git->result) * REUSE_PERCENT; | |
824 | ||
825 | if (reuse_objects < reuse_threshold) | |
826 | return -1; | |
827 | ||
828 | bitmap_git->reuse_objects = *entries = reuse_objects; | |
829 | *up_to = bitmap_git->pack->revindex[reuse_objects].offset; | |
830 | *packfile = bitmap_git->pack; | |
831 | ||
832 | return 0; | |
833 | } | |
834 | ||
835 | void traverse_bitmap_commit_list(struct bitmap_index *bitmap_git, | |
836 | show_reachable_fn show_reachable) | |
837 | { | |
838 | assert(bitmap_git->result); | |
839 | ||
840 | show_objects_for_type(bitmap_git, bitmap_git->commits, | |
841 | OBJ_COMMIT, show_reachable); | |
842 | show_objects_for_type(bitmap_git, bitmap_git->trees, | |
843 | OBJ_TREE, show_reachable); | |
844 | show_objects_for_type(bitmap_git, bitmap_git->blobs, | |
845 | OBJ_BLOB, show_reachable); | |
846 | show_objects_for_type(bitmap_git, bitmap_git->tags, | |
847 | OBJ_TAG, show_reachable); | |
848 | ||
849 | show_extended_objects(bitmap_git, show_reachable); | |
850 | } | |
851 | ||
852 | static uint32_t count_object_type(struct bitmap_index *bitmap_git, | |
853 | enum object_type type) | |
854 | { | |
855 | struct bitmap *objects = bitmap_git->result; | |
856 | struct eindex *eindex = &bitmap_git->ext_index; | |
857 | ||
858 | uint32_t i = 0, count = 0; | |
859 | struct ewah_iterator it; | |
860 | eword_t filter; | |
861 | ||
862 | switch (type) { | |
863 | case OBJ_COMMIT: | |
864 | ewah_iterator_init(&it, bitmap_git->commits); | |
865 | break; | |
866 | ||
867 | case OBJ_TREE: | |
868 | ewah_iterator_init(&it, bitmap_git->trees); | |
869 | break; | |
870 | ||
871 | case OBJ_BLOB: | |
872 | ewah_iterator_init(&it, bitmap_git->blobs); | |
873 | break; | |
874 | ||
875 | case OBJ_TAG: | |
876 | ewah_iterator_init(&it, bitmap_git->tags); | |
877 | break; | |
878 | ||
879 | default: | |
880 | return 0; | |
881 | } | |
882 | ||
883 | while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) { | |
884 | eword_t word = objects->words[i++] & filter; | |
885 | count += ewah_bit_popcount64(word); | |
886 | } | |
887 | ||
888 | for (i = 0; i < eindex->count; ++i) { | |
889 | if (eindex->objects[i]->type == type && | |
890 | bitmap_get(objects, bitmap_git->pack->num_objects + i)) | |
891 | count++; | |
892 | } | |
893 | ||
894 | return count; | |
895 | } | |
896 | ||
897 | void count_bitmap_commit_list(struct bitmap_index *bitmap_git, | |
898 | uint32_t *commits, uint32_t *trees, | |
899 | uint32_t *blobs, uint32_t *tags) | |
900 | { | |
901 | assert(bitmap_git->result); | |
902 | ||
903 | if (commits) | |
904 | *commits = count_object_type(bitmap_git, OBJ_COMMIT); | |
905 | ||
906 | if (trees) | |
907 | *trees = count_object_type(bitmap_git, OBJ_TREE); | |
908 | ||
909 | if (blobs) | |
910 | *blobs = count_object_type(bitmap_git, OBJ_BLOB); | |
911 | ||
912 | if (tags) | |
913 | *tags = count_object_type(bitmap_git, OBJ_TAG); | |
914 | } | |
915 | ||
916 | struct bitmap_test_data { | |
917 | struct bitmap_index *bitmap_git; | |
918 | struct bitmap *base; | |
919 | struct progress *prg; | |
920 | size_t seen; | |
921 | }; | |
922 | ||
923 | static void test_show_object(struct object *object, const char *name, | |
924 | void *data) | |
925 | { | |
926 | struct bitmap_test_data *tdata = data; | |
927 | int bitmap_pos; | |
928 | ||
929 | bitmap_pos = bitmap_position(tdata->bitmap_git, &object->oid); | |
930 | if (bitmap_pos < 0) | |
931 | die("Object not in bitmap: %s\n", oid_to_hex(&object->oid)); | |
932 | ||
933 | bitmap_set(tdata->base, bitmap_pos); | |
934 | display_progress(tdata->prg, ++tdata->seen); | |
935 | } | |
936 | ||
937 | static void test_show_commit(struct commit *commit, void *data) | |
938 | { | |
939 | struct bitmap_test_data *tdata = data; | |
940 | int bitmap_pos; | |
941 | ||
942 | bitmap_pos = bitmap_position(tdata->bitmap_git, | |
943 | &commit->object.oid); | |
944 | if (bitmap_pos < 0) | |
945 | die("Object not in bitmap: %s\n", oid_to_hex(&commit->object.oid)); | |
946 | ||
947 | bitmap_set(tdata->base, bitmap_pos); | |
948 | display_progress(tdata->prg, ++tdata->seen); | |
949 | } | |
950 | ||
951 | void test_bitmap_walk(struct rev_info *revs) | |
952 | { | |
953 | struct object *root; | |
954 | struct bitmap *result = NULL; | |
955 | khiter_t pos; | |
956 | size_t result_popcnt; | |
957 | struct bitmap_test_data tdata; | |
958 | struct bitmap_index *bitmap_git; | |
959 | ||
960 | if (!(bitmap_git = prepare_bitmap_git(revs->repo))) | |
961 | die("failed to load bitmap indexes"); | |
962 | ||
963 | if (revs->pending.nr != 1) | |
964 | die("you must specify exactly one commit to test"); | |
965 | ||
966 | fprintf(stderr, "Bitmap v%d test (%d entries loaded)\n", | |
967 | bitmap_git->version, bitmap_git->entry_count); | |
968 | ||
969 | root = revs->pending.objects[0].item; | |
970 | pos = kh_get_oid_map(bitmap_git->bitmaps, root->oid); | |
971 | ||
972 | if (pos < kh_end(bitmap_git->bitmaps)) { | |
973 | struct stored_bitmap *st = kh_value(bitmap_git->bitmaps, pos); | |
974 | struct ewah_bitmap *bm = lookup_stored_bitmap(st); | |
975 | ||
976 | fprintf(stderr, "Found bitmap for %s. %d bits / %08x checksum\n", | |
977 | oid_to_hex(&root->oid), (int)bm->bit_size, ewah_checksum(bm)); | |
978 | ||
979 | result = ewah_to_bitmap(bm); | |
980 | } | |
981 | ||
982 | if (result == NULL) | |
983 | die("Commit %s doesn't have an indexed bitmap", oid_to_hex(&root->oid)); | |
984 | ||
985 | revs->tag_objects = 1; | |
986 | revs->tree_objects = 1; | |
987 | revs->blob_objects = 1; | |
988 | ||
989 | result_popcnt = bitmap_popcount(result); | |
990 | ||
991 | if (prepare_revision_walk(revs)) | |
992 | die("revision walk setup failed"); | |
993 | ||
994 | tdata.bitmap_git = bitmap_git; | |
995 | tdata.base = bitmap_new(); | |
996 | tdata.prg = start_progress("Verifying bitmap entries", result_popcnt); | |
997 | tdata.seen = 0; | |
998 | ||
999 | traverse_commit_list(revs, &test_show_commit, &test_show_object, &tdata); | |
1000 | ||
1001 | stop_progress(&tdata.prg); | |
1002 | ||
1003 | if (bitmap_equals(result, tdata.base)) | |
1004 | fprintf(stderr, "OK!\n"); | |
1005 | else | |
1006 | fprintf(stderr, "Mismatch!\n"); | |
1007 | ||
1008 | free_bitmap_index(bitmap_git); | |
1009 | } | |
1010 | ||
1011 | static int rebuild_bitmap(uint32_t *reposition, | |
1012 | struct ewah_bitmap *source, | |
1013 | struct bitmap *dest) | |
1014 | { | |
1015 | uint32_t pos = 0; | |
1016 | struct ewah_iterator it; | |
1017 | eword_t word; | |
1018 | ||
1019 | ewah_iterator_init(&it, source); | |
1020 | ||
1021 | while (ewah_iterator_next(&word, &it)) { | |
1022 | uint32_t offset, bit_pos; | |
1023 | ||
1024 | for (offset = 0; offset < BITS_IN_EWORD; ++offset) { | |
1025 | if ((word >> offset) == 0) | |
1026 | break; | |
1027 | ||
1028 | offset += ewah_bit_ctz64(word >> offset); | |
1029 | ||
1030 | bit_pos = reposition[pos + offset]; | |
1031 | if (bit_pos > 0) | |
1032 | bitmap_set(dest, bit_pos - 1); | |
1033 | else /* can't reuse, we don't have the object */ | |
1034 | return -1; | |
1035 | } | |
1036 | ||
1037 | pos += BITS_IN_EWORD; | |
1038 | } | |
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | int rebuild_existing_bitmaps(struct bitmap_index *bitmap_git, | |
1043 | struct packing_data *mapping, | |
1044 | khash_sha1 *reused_bitmaps, | |
1045 | int show_progress) | |
1046 | { | |
1047 | uint32_t i, num_objects; | |
1048 | uint32_t *reposition; | |
1049 | struct bitmap *rebuild; | |
1050 | struct stored_bitmap *stored; | |
1051 | struct progress *progress = NULL; | |
1052 | ||
1053 | khiter_t hash_pos; | |
1054 | int hash_ret; | |
1055 | ||
1056 | num_objects = bitmap_git->pack->num_objects; | |
1057 | reposition = xcalloc(num_objects, sizeof(uint32_t)); | |
1058 | ||
1059 | for (i = 0; i < num_objects; ++i) { | |
1060 | const unsigned char *sha1; | |
1061 | struct revindex_entry *entry; | |
1062 | struct object_entry *oe; | |
1063 | ||
1064 | entry = &bitmap_git->pack->revindex[i]; | |
1065 | sha1 = nth_packed_object_sha1(bitmap_git->pack, entry->nr); | |
1066 | oe = packlist_find(mapping, sha1, NULL); | |
1067 | ||
1068 | if (oe) | |
1069 | reposition[i] = oe_in_pack_pos(mapping, oe) + 1; | |
1070 | } | |
1071 | ||
1072 | rebuild = bitmap_new(); | |
1073 | i = 0; | |
1074 | ||
1075 | if (show_progress) | |
1076 | progress = start_progress("Reusing bitmaps", 0); | |
1077 | ||
1078 | kh_foreach_value(bitmap_git->bitmaps, stored, { | |
1079 | if (stored->flags & BITMAP_FLAG_REUSE) { | |
1080 | if (!rebuild_bitmap(reposition, | |
1081 | lookup_stored_bitmap(stored), | |
1082 | rebuild)) { | |
1083 | hash_pos = kh_put_sha1(reused_bitmaps, | |
1084 | stored->oid.hash, | |
1085 | &hash_ret); | |
1086 | kh_value(reused_bitmaps, hash_pos) = | |
1087 | bitmap_to_ewah(rebuild); | |
1088 | } | |
1089 | bitmap_reset(rebuild); | |
1090 | display_progress(progress, ++i); | |
1091 | } | |
1092 | }); | |
1093 | ||
1094 | stop_progress(&progress); | |
1095 | ||
1096 | free(reposition); | |
1097 | bitmap_free(rebuild); | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | void free_bitmap_index(struct bitmap_index *b) | |
1102 | { | |
1103 | if (!b) | |
1104 | return; | |
1105 | ||
1106 | if (b->map) | |
1107 | munmap(b->map, b->map_size); | |
1108 | ewah_pool_free(b->commits); | |
1109 | ewah_pool_free(b->trees); | |
1110 | ewah_pool_free(b->blobs); | |
1111 | ewah_pool_free(b->tags); | |
1112 | kh_destroy_oid_map(b->bitmaps); | |
1113 | free(b->ext_index.objects); | |
1114 | free(b->ext_index.hashes); | |
1115 | bitmap_free(b->result); | |
1116 | bitmap_free(b->haves); | |
1117 | free(b); | |
1118 | } | |
1119 | ||
1120 | int bitmap_has_oid_in_uninteresting(struct bitmap_index *bitmap_git, | |
1121 | const struct object_id *oid) | |
1122 | { | |
1123 | int pos; | |
1124 | ||
1125 | if (!bitmap_git) | |
1126 | return 0; /* no bitmap loaded */ | |
1127 | if (!bitmap_git->haves) | |
1128 | return 0; /* walk had no "haves" */ | |
1129 | ||
1130 | pos = bitmap_position_packfile(bitmap_git, oid); | |
1131 | if (pos < 0) | |
1132 | return 0; | |
1133 | ||
1134 | return bitmap_get(bitmap_git->haves, pos); | |
1135 | } |