#define USE_THE_REPOSITORY_VARIABLE #include "git-compat-util.h" #include "commit.h" #include "gettext.h" #include "hex.h" #include "strbuf.h" #include "tag.h" #include "diff.h" #include "revision.h" #include "progress.h" #include "list-objects.h" #include "pack.h" #include "pack-bitmap.h" #include "pack-revindex.h" #include "pack-objects.h" #include "packfile.h" #include "repository.h" #include "trace2.h" #include "object-file.h" #include "object-store-ll.h" #include "list-objects-filter-options.h" #include "midx.h" #include "config.h" #include "pseudo-merge.h" /* * An entry on the bitmap index, representing the bitmap for a given * commit. */ struct stored_bitmap { struct object_id oid; struct ewah_bitmap *root; struct stored_bitmap *xor; int flags; }; /* * The active bitmap index for a repository. By design, repositories only have * a single bitmap index available (the index for the biggest packfile in * the repository), since bitmap indexes need full closure. * * If there is more than one bitmap index available (e.g. because of alternates), * the active bitmap index is the largest one. */ struct bitmap_index { /* * The pack or multi-pack index (MIDX) that this bitmap index belongs * to. * * Exactly one of these must be non-NULL; this specifies the object * order used to interpret this bitmap. */ struct packed_git *pack; struct multi_pack_index *midx; /* mmapped buffer of the whole bitmap index */ unsigned char *map; size_t map_size; /* size of the mmaped buffer */ size_t map_pos; /* current position when loading the index */ /* * Type indexes. * * Each bitmap marks which objects in the packfile are of the given * type. This provides type information when yielding the objects from * the packfile during a walk, which allows for better delta bases. */ struct ewah_bitmap *commits; struct ewah_bitmap *trees; struct ewah_bitmap *blobs; struct ewah_bitmap *tags; /* Map from object ID -> `stored_bitmap` for all the bitmapped commits */ kh_oid_map_t *bitmaps; /* Number of bitmapped commits */ uint32_t entry_count; /* If not NULL, this is a name-hash cache pointing into map. */ uint32_t *hashes; /* The checksum of the packfile or MIDX; points into map. */ const unsigned char *checksum; /* * If not NULL, this point into the commit table extension * (within the memory mapped region `map`). */ unsigned char *table_lookup; /* This contains the pseudo-merge cache within 'map' (if found). */ struct pseudo_merge_map pseudo_merges; /* * Extended index. * * When trying to perform bitmap operations with objects that are not * packed in `pack`, these objects are added to this "fake index" and * are assumed to appear at the end of the packfile for all operations */ struct eindex { struct object **objects; uint32_t *hashes; uint32_t count, alloc; kh_oid_pos_t *positions; } ext_index; /* Bitmap result of the last performed walk */ struct bitmap *result; /* "have" bitmap from the last performed walk */ struct bitmap *haves; /* Version of the bitmap index */ unsigned int version; }; static int pseudo_merges_satisfied_nr; static int pseudo_merges_cascades_nr; static int existing_bitmaps_hits_nr; static int existing_bitmaps_misses_nr; static int roots_with_bitmaps_nr; static int roots_without_bitmaps_nr; static struct ewah_bitmap *lookup_stored_bitmap(struct stored_bitmap *st) { struct ewah_bitmap *parent; struct ewah_bitmap *composed; if (!st->xor) return st->root; composed = ewah_pool_new(); parent = lookup_stored_bitmap(st->xor); ewah_xor(st->root, parent, composed); ewah_pool_free(st->root); st->root = composed; st->xor = NULL; return composed; } struct ewah_bitmap *read_bitmap(const unsigned char *map, size_t map_size, size_t *map_pos) { struct ewah_bitmap *b = ewah_pool_new(); ssize_t bitmap_size = ewah_read_mmap(b, map + *map_pos, map_size - *map_pos); if (bitmap_size < 0) { error(_("failed to load bitmap index (corrupted?)")); ewah_pool_free(b); return NULL; } *map_pos += bitmap_size; return b; } /* * Read a bitmap from the current read position on the mmaped * index, and increase the read position accordingly */ static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index) { return read_bitmap(index->map, index->map_size, &index->map_pos); } static uint32_t bitmap_num_objects(struct bitmap_index *index) { if (index->midx) return index->midx->num_objects; return index->pack->num_objects; } static int load_bitmap_header(struct bitmap_index *index) { struct bitmap_disk_header *header = (void *)index->map; size_t header_size = sizeof(*header) - GIT_MAX_RAWSZ + the_hash_algo->rawsz; if (index->map_size < header_size + the_hash_algo->rawsz) return error(_("corrupted bitmap index (too small)")); if (memcmp(header->magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE)) != 0) return error(_("corrupted bitmap index file (wrong header)")); index->version = ntohs(header->version); if (index->version != 1) return error(_("unsupported version '%d' for bitmap index file"), index->version); /* Parse known bitmap format options */ { uint32_t flags = ntohs(header->options); size_t cache_size = st_mult(bitmap_num_objects(index), sizeof(uint32_t)); unsigned char *index_end = index->map + index->map_size - the_hash_algo->rawsz; if ((flags & BITMAP_OPT_FULL_DAG) == 0) BUG("unsupported options for bitmap index file " "(Git requires BITMAP_OPT_FULL_DAG)"); if (flags & BITMAP_OPT_HASH_CACHE) { if (cache_size > index_end - index->map - header_size) return error(_("corrupted bitmap index file (too short to fit hash cache)")); index->hashes = (void *)(index_end - cache_size); index_end -= cache_size; } if (flags & BITMAP_OPT_LOOKUP_TABLE) { size_t table_size = st_mult(ntohl(header->entry_count), BITMAP_LOOKUP_TABLE_TRIPLET_WIDTH); if (table_size > index_end - index->map - header_size) return error(_("corrupted bitmap index file (too short to fit lookup table)")); if (git_env_bool("GIT_TEST_READ_COMMIT_TABLE", 1)) index->table_lookup = (void *)(index_end - table_size); index_end -= table_size; } if (flags & BITMAP_OPT_PSEUDO_MERGES) { unsigned char *pseudo_merge_ofs; size_t table_size; uint32_t i; if (sizeof(table_size) > index_end - index->map - header_size) return error(_("corrupted bitmap index file (too short to fit pseudo-merge table header)")); table_size = get_be64(index_end - 8); if (table_size > index_end - index->map - header_size) return error(_("corrupted bitmap index file (too short to fit pseudo-merge table)")); if (git_env_bool("GIT_TEST_USE_PSEUDO_MERGES", 1)) { const unsigned char *ext = (index_end - table_size); index->pseudo_merges.map = index->map; index->pseudo_merges.map_size = index->map_size; index->pseudo_merges.commits = ext + get_be64(index_end - 16); index->pseudo_merges.commits_nr = get_be32(index_end - 20); index->pseudo_merges.nr = get_be32(index_end - 24); if (st_add(st_mult(index->pseudo_merges.nr, sizeof(uint64_t)), 24) > table_size) return error(_("corrupted bitmap index file, pseudo-merge table too short")); CALLOC_ARRAY(index->pseudo_merges.v, index->pseudo_merges.nr); pseudo_merge_ofs = index_end - 24 - (index->pseudo_merges.nr * sizeof(uint64_t)); for (i = 0; i < index->pseudo_merges.nr; i++) { index->pseudo_merges.v[i].at = get_be64(pseudo_merge_ofs); pseudo_merge_ofs += sizeof(uint64_t); } } index_end -= table_size; } } index->entry_count = ntohl(header->entry_count); index->checksum = header->checksum; index->map_pos += header_size; return 0; } static struct stored_bitmap *store_bitmap(struct bitmap_index *index, struct ewah_bitmap *root, const struct object_id *oid, struct stored_bitmap *xor_with, int flags) { struct stored_bitmap *stored; khiter_t hash_pos; int ret; stored = xmalloc(sizeof(struct stored_bitmap)); stored->root = root; stored->xor = xor_with; stored->flags = flags; oidcpy(&stored->oid, oid); hash_pos = kh_put_oid_map(index->bitmaps, stored->oid, &ret); /* * A 0 return code means the insertion succeeded with no changes, * because the SHA1 already existed on the map. This is bad, there * shouldn't be duplicated commits in the index. */ if (ret == 0) { error(_("duplicate entry in bitmap index: '%s'"), oid_to_hex(oid)); return NULL; } kh_value(index->bitmaps, hash_pos) = stored; return stored; } static inline uint32_t read_be32(const unsigned char *buffer, size_t *pos) { uint32_t result = get_be32(buffer + *pos); (*pos) += sizeof(result); return result; } static inline uint8_t read_u8(const unsigned char *buffer, size_t *pos) { return buffer[(*pos)++]; } #define MAX_XOR_OFFSET 160 static int nth_bitmap_object_oid(struct bitmap_index *index, struct object_id *oid, uint32_t n) { if (index->midx) return nth_midxed_object_oid(oid, index->midx, n) ? 0 : -1; return nth_packed_object_id(oid, index->pack, n); } static int load_bitmap_entries_v1(struct bitmap_index *index) { uint32_t i; struct stored_bitmap *recent_bitmaps[MAX_XOR_OFFSET] = { NULL }; for (i = 0; i < index->entry_count; ++i) { int xor_offset, flags; struct ewah_bitmap *bitmap = NULL; struct stored_bitmap *xor_bitmap = NULL; uint32_t commit_idx_pos; struct object_id oid; if (index->map_size - index->map_pos < 6) return error(_("corrupt ewah bitmap: truncated header for entry %d"), i); commit_idx_pos = read_be32(index->map, &index->map_pos); xor_offset = read_u8(index->map, &index->map_pos); flags = read_u8(index->map, &index->map_pos); if (nth_bitmap_object_oid(index, &oid, commit_idx_pos) < 0) return error(_("corrupt ewah bitmap: commit index %u out of range"), (unsigned)commit_idx_pos); bitmap = read_bitmap_1(index); if (!bitmap) return -1; if (xor_offset > MAX_XOR_OFFSET || xor_offset > i) return error(_("corrupted bitmap pack index")); if (xor_offset > 0) { xor_bitmap = recent_bitmaps[(i - xor_offset) % MAX_XOR_OFFSET]; if (!xor_bitmap) return error(_("invalid XOR offset in bitmap pack index")); } recent_bitmaps[i % MAX_XOR_OFFSET] = store_bitmap( index, bitmap, &oid, xor_bitmap, flags); } return 0; } char *midx_bitmap_filename(struct multi_pack_index *midx) { struct strbuf buf = STRBUF_INIT; get_midx_filename_ext(&buf, midx->object_dir, get_midx_checksum(midx), MIDX_EXT_BITMAP); return strbuf_detach(&buf, NULL); } char *pack_bitmap_filename(struct packed_git *p) { size_t len; if (!strip_suffix(p->pack_name, ".pack", &len)) BUG("pack_name does not end in .pack"); return xstrfmt("%.*s.bitmap", (int)len, p->pack_name); } static int open_midx_bitmap_1(struct bitmap_index *bitmap_git, struct multi_pack_index *midx) { struct stat st; char *bitmap_name = midx_bitmap_filename(midx); int fd = git_open(bitmap_name); uint32_t i, preferred_pack; struct packed_git *preferred; if (fd < 0) { if (errno != ENOENT) warning_errno("cannot open '%s'", bitmap_name); free(bitmap_name); return -1; } free(bitmap_name); if (fstat(fd, &st)) { error_errno(_("cannot fstat bitmap file")); close(fd); return -1; } if (bitmap_git->pack || bitmap_git->midx) { struct strbuf buf = STRBUF_INIT; get_midx_filename(&buf, midx->object_dir); trace2_data_string("bitmap", the_repository, "ignoring extra midx bitmap file", buf.buf); close(fd); strbuf_release(&buf); return -1; } bitmap_git->midx = midx; bitmap_git->map_size = xsize_t(st.st_size); bitmap_git->map_pos = 0; bitmap_git->map = xmmap(NULL, bitmap_git->map_size, PROT_READ, MAP_PRIVATE, fd, 0); close(fd); if (load_bitmap_header(bitmap_git) < 0) goto cleanup; if (!hasheq(get_midx_checksum(bitmap_git->midx), bitmap_git->checksum, the_repository->hash_algo)) { error(_("checksum doesn't match in MIDX and bitmap")); goto cleanup; } if (load_midx_revindex(bitmap_git->midx)) { warning(_("multi-pack bitmap is missing required reverse index")); goto cleanup; } for (i = 0; i < bitmap_git->midx->num_packs; i++) { if (prepare_midx_pack(the_repository, bitmap_git->midx, i)) { warning(_("could not open pack %s"), bitmap_git->midx->pack_names[i]); goto cleanup; } } if (midx_preferred_pack(bitmap_git->midx, &preferred_pack) < 0) { warning(_("could not determine MIDX preferred pack")); goto cleanup; } preferred = bitmap_git->midx->packs[preferred_pack]; if (!is_pack_valid(preferred)) { warning(_("preferred pack (%s) is invalid"), preferred->pack_name); goto cleanup; } return 0; cleanup: munmap(bitmap_git->map, bitmap_git->map_size); bitmap_git->map_size = 0; bitmap_git->map_pos = 0; bitmap_git->map = NULL; bitmap_git->midx = NULL; return -1; } static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git *packfile) { int fd; struct stat st; char *bitmap_name; bitmap_name = pack_bitmap_filename(packfile); fd = git_open(bitmap_name); if (fd < 0) { if (errno != ENOENT) warning_errno("cannot open '%s'", bitmap_name); free(bitmap_name); return -1; } free(bitmap_name); if (fstat(fd, &st)) { error_errno(_("cannot fstat bitmap file")); close(fd); return -1; } if (bitmap_git->pack || bitmap_git->midx) { trace2_data_string("bitmap", the_repository, "ignoring extra bitmap file", packfile->pack_name); close(fd); return -1; } if (!is_pack_valid(packfile)) { close(fd); return -1; } bitmap_git->pack = packfile; bitmap_git->map_size = xsize_t(st.st_size); bitmap_git->map = xmmap(NULL, bitmap_git->map_size, PROT_READ, MAP_PRIVATE, fd, 0); bitmap_git->map_pos = 0; close(fd); if (load_bitmap_header(bitmap_git) < 0) { munmap(bitmap_git->map, bitmap_git->map_size); bitmap_git->map = NULL; bitmap_git->map_size = 0; bitmap_git->map_pos = 0; bitmap_git->pack = NULL; return -1; } trace2_data_string("bitmap", the_repository, "opened bitmap file", packfile->pack_name); return 0; } static int load_reverse_index(struct repository *r, struct bitmap_index *bitmap_git) { if (bitmap_is_midx(bitmap_git)) { uint32_t i; int ret; /* * The multi-pack-index's .rev file is already loaded via * open_pack_bitmap_1(). * * But we still need to open the individual pack .rev files, * since we will need to make use of them in pack-objects. */ for (i = 0; i < bitmap_git->midx->num_packs; i++) { ret = load_pack_revindex(r, bitmap_git->midx->packs[i]); if (ret) return ret; } return 0; } return load_pack_revindex(r, bitmap_git->pack); } static int load_bitmap(struct repository *r, struct bitmap_index *bitmap_git) { assert(bitmap_git->map); bitmap_git->bitmaps = kh_init_oid_map(); bitmap_git->ext_index.positions = kh_init_oid_pos(); if (load_reverse_index(r, bitmap_git)) goto failed; if (!(bitmap_git->commits = read_bitmap_1(bitmap_git)) || !(bitmap_git->trees = read_bitmap_1(bitmap_git)) || !(bitmap_git->blobs = read_bitmap_1(bitmap_git)) || !(bitmap_git->tags = read_bitmap_1(bitmap_git))) goto failed; if (!bitmap_git->table_lookup && load_bitmap_entries_v1(bitmap_git) < 0) goto failed; return 0; failed: munmap(bitmap_git->map, bitmap_git->map_size); bitmap_git->map = NULL; bitmap_git->map_size = 0; kh_destroy_oid_map(bitmap_git->bitmaps); bitmap_git->bitmaps = NULL; kh_destroy_oid_pos(bitmap_git->ext_index.positions); bitmap_git->ext_index.positions = NULL; return -1; } static int open_pack_bitmap(struct repository *r, struct bitmap_index *bitmap_git) { struct packed_git *p; int ret = -1; for (p = get_all_packs(r); p; p = p->next) { if (open_pack_bitmap_1(bitmap_git, p) == 0) { ret = 0; /* * The only reason to keep looking is to report * duplicates. */ if (!trace2_is_enabled()) break; } } return ret; } static int open_midx_bitmap(struct repository *r, struct bitmap_index *bitmap_git) { int ret = -1; struct multi_pack_index *midx; assert(!bitmap_git->map); for (midx = get_multi_pack_index(r); midx; midx = midx->next) { if (!open_midx_bitmap_1(bitmap_git, midx)) ret = 0; } return ret; } static int open_bitmap(struct repository *r, struct bitmap_index *bitmap_git) { int found; assert(!bitmap_git->map); found = !open_midx_bitmap(r, bitmap_git); /* * these will all be skipped if we opened a midx bitmap; but run it * anyway if tracing is enabled to report the duplicates */ if (!found || trace2_is_enabled()) found |= !open_pack_bitmap(r, bitmap_git); return found ? 0 : -1; } struct bitmap_index *prepare_bitmap_git(struct repository *r) { struct bitmap_index *bitmap_git = xcalloc(1, sizeof(*bitmap_git)); if (!open_bitmap(r, bitmap_git) && !load_bitmap(r, bitmap_git)) return bitmap_git; free_bitmap_index(bitmap_git); return NULL; } struct bitmap_index *prepare_midx_bitmap_git(struct multi_pack_index *midx) { struct repository *r = the_repository; struct bitmap_index *bitmap_git = xcalloc(1, sizeof(*bitmap_git)); if (!open_midx_bitmap_1(bitmap_git, midx) && !load_bitmap(r, bitmap_git)) return bitmap_git; free_bitmap_index(bitmap_git); return NULL; } struct include_data { struct bitmap_index *bitmap_git; struct bitmap *base; struct bitmap *seen; }; struct bitmap_lookup_table_triplet { uint32_t commit_pos; uint64_t offset; uint32_t xor_row; }; struct bitmap_lookup_table_xor_item { struct object_id oid; uint64_t offset; }; /* * Given a `triplet` struct pointer and pointer `p`, this * function reads the triplet beginning at `p` into the struct. * Note that this function assumes that there is enough memory * left for filling the `triplet` struct from `p`. */ static int bitmap_lookup_table_get_triplet_by_pointer(struct bitmap_lookup_table_triplet *triplet, const unsigned char *p) { if (!triplet) return -1; triplet->commit_pos = get_be32(p); p += sizeof(uint32_t); triplet->offset = get_be64(p); p += sizeof(uint64_t); triplet->xor_row = get_be32(p); return 0; } /* * This function gets the raw triplet from `row`'th row in the * lookup table and fills that data to the `triplet`. */ static int bitmap_lookup_table_get_triplet(struct bitmap_index *bitmap_git, uint32_t pos, struct bitmap_lookup_table_triplet *triplet) { unsigned char *p = NULL; if (pos >= bitmap_git->entry_count) return error(_("corrupt bitmap lookup table: triplet position out of index")); p = bitmap_git->table_lookup + st_mult(pos, BITMAP_LOOKUP_TABLE_TRIPLET_WIDTH); return bitmap_lookup_table_get_triplet_by_pointer(triplet, p); } /* * Searches for a matching triplet. `commit_pos` is a pointer * to the wanted commit position value. `table_entry` points to * a triplet in lookup table. The first 4 bytes of each * triplet (pointed by `table_entry`) are compared with `*commit_pos`. */ static int triplet_cmp(const void *commit_pos, const void *table_entry) { uint32_t a = *(uint32_t *)commit_pos; uint32_t b = get_be32(table_entry); if (a > b) return 1; else if (a < b) return -1; return 0; } static uint32_t bitmap_bsearch_pos(struct bitmap_index *bitmap_git, struct object_id *oid, uint32_t *result) { int found; if (bitmap_is_midx(bitmap_git)) found = bsearch_midx(oid, bitmap_git->midx, result); else found = bsearch_pack(oid, bitmap_git->pack, result); return found; } /* * `bsearch_triplet_by_pos` function searches for the raw triplet * having commit position same as `commit_pos` and fills `triplet` * object from the raw triplet. Returns 1 on success and 0 on * failure. */ static int bitmap_bsearch_triplet_by_pos(uint32_t commit_pos, struct bitmap_index *bitmap_git, struct bitmap_lookup_table_triplet *triplet) { unsigned char *p = bsearch(&commit_pos, bitmap_git->table_lookup, bitmap_git->entry_count, BITMAP_LOOKUP_TABLE_TRIPLET_WIDTH, triplet_cmp); if (!p) return -1; return bitmap_lookup_table_get_triplet_by_pointer(triplet, p); } static struct stored_bitmap *lazy_bitmap_for_commit(struct bitmap_index *bitmap_git, struct commit *commit) { uint32_t commit_pos, xor_row; uint64_t offset; int flags; struct bitmap_lookup_table_triplet triplet; struct object_id *oid = &commit->object.oid; struct ewah_bitmap *bitmap; struct stored_bitmap *xor_bitmap = NULL; const int bitmap_header_size = 6; static struct bitmap_lookup_table_xor_item *xor_items = NULL; static size_t xor_items_nr = 0, xor_items_alloc = 0; static int is_corrupt = 0; int xor_flags; khiter_t hash_pos; struct bitmap_lookup_table_xor_item *xor_item; if (is_corrupt) return NULL; if (!bitmap_bsearch_pos(bitmap_git, oid, &commit_pos)) return NULL; if (bitmap_bsearch_triplet_by_pos(commit_pos, bitmap_git, &triplet) < 0) return NULL; xor_items_nr = 0; offset = triplet.offset; xor_row = triplet.xor_row; while (xor_row != 0xffffffff) { ALLOC_GROW(xor_items, xor_items_nr + 1, xor_items_alloc); if (xor_items_nr + 1 >= bitmap_git->entry_count) { error(_("corrupt bitmap lookup table: xor chain exceeds entry count")); goto corrupt; } if (bitmap_lookup_table_get_triplet(bitmap_git, xor_row, &triplet) < 0) goto corrupt; xor_item = &xor_items[xor_items_nr]; xor_item->offset = triplet.offset; if (nth_bitmap_object_oid(bitmap_git, &xor_item->oid, triplet.commit_pos) < 0) { error(_("corrupt bitmap lookup table: commit index %u out of range"), triplet.commit_pos); goto corrupt; } hash_pos = kh_get_oid_map(bitmap_git->bitmaps, xor_item->oid); /* * If desired bitmap is already stored, we don't need * to iterate further. Because we know that bitmaps * that are needed to be parsed to parse this bitmap * has already been stored. So, assign this stored bitmap * to the xor_bitmap. */ if (hash_pos < kh_end(bitmap_git->bitmaps) && (xor_bitmap = kh_value(bitmap_git->bitmaps, hash_pos))) break; xor_items_nr++; xor_row = triplet.xor_row; } while (xor_items_nr) { xor_item = &xor_items[xor_items_nr - 1]; bitmap_git->map_pos = xor_item->offset; if (bitmap_git->map_size - bitmap_git->map_pos < bitmap_header_size) { error(_("corrupt ewah bitmap: truncated header for bitmap of commit \"%s\""), oid_to_hex(&xor_item->oid)); goto corrupt; } bitmap_git->map_pos += sizeof(uint32_t) + sizeof(uint8_t); xor_flags = read_u8(bitmap_git->map, &bitmap_git->map_pos); bitmap = read_bitmap_1(bitmap_git); if (!bitmap) goto corrupt; xor_bitmap = store_bitmap(bitmap_git, bitmap, &xor_item->oid, xor_bitmap, xor_flags); xor_items_nr--; } bitmap_git->map_pos = offset; if (bitmap_git->map_size - bitmap_git->map_pos < bitmap_header_size) { error(_("corrupt ewah bitmap: truncated header for bitmap of commit \"%s\""), oid_to_hex(oid)); goto corrupt; } /* * Don't bother reading the commit's index position or its xor * offset: * * - The commit's index position is irrelevant to us, since * load_bitmap_entries_v1 only uses it to learn the object * id which is used to compute the hashmap's key. We already * have an object id, so no need to look it up again. * * - The xor_offset is unusable for us, since it specifies how * many entries previous to ours we should look at. This * makes sense when reading the bitmaps sequentially (as in * load_bitmap_entries_v1()), since we can keep track of * each bitmap as we read them. * * But it can't work for us, since the bitmap's don't have a * fixed size. So we learn the position of the xor'd bitmap * from the commit table (and resolve it to a bitmap in the * above if-statement). * * Instead, we can skip ahead and immediately read the flags and * ewah bitmap. */ bitmap_git->map_pos += sizeof(uint32_t) + sizeof(uint8_t); flags = read_u8(bitmap_git->map, &bitmap_git->map_pos); bitmap = read_bitmap_1(bitmap_git); if (!bitmap) goto corrupt; return store_bitmap(bitmap_git, bitmap, oid, xor_bitmap, flags); corrupt: free(xor_items); is_corrupt = 1; return NULL; } struct ewah_bitmap *bitmap_for_commit(struct bitmap_index *bitmap_git, struct commit *commit) { khiter_t hash_pos = kh_get_oid_map(bitmap_git->bitmaps, commit->object.oid); if (hash_pos >= kh_end(bitmap_git->bitmaps)) { struct stored_bitmap *bitmap = NULL; if (!bitmap_git->table_lookup) return NULL; /* this is a fairly hot codepath - no trace2_region please */ /* NEEDSWORK: cache misses aren't recorded */ bitmap = lazy_bitmap_for_commit(bitmap_git, commit); if (!bitmap) return NULL; return lookup_stored_bitmap(bitmap); } return lookup_stored_bitmap(kh_value(bitmap_git->bitmaps, hash_pos)); } static inline int bitmap_position_extended(struct bitmap_index *bitmap_git, const struct object_id *oid) { kh_oid_pos_t *positions = bitmap_git->ext_index.positions; khiter_t pos = kh_get_oid_pos(positions, *oid); if (pos < kh_end(positions)) { int bitmap_pos = kh_value(positions, pos); return bitmap_pos + bitmap_num_objects(bitmap_git); } return -1; } static inline int bitmap_position_packfile(struct bitmap_index *bitmap_git, const struct object_id *oid) { uint32_t pos; off_t offset = find_pack_entry_one(oid, bitmap_git->pack); if (!offset) return -1; if (offset_to_pack_pos(bitmap_git->pack, offset, &pos) < 0) return -1; return pos; } static int bitmap_position_midx(struct bitmap_index *bitmap_git, const struct object_id *oid) { uint32_t want, got; if (!bsearch_midx(oid, bitmap_git->midx, &want)) return -1; if (midx_to_pack_pos(bitmap_git->midx, want, &got) < 0) return -1; return got; } static int bitmap_position(struct bitmap_index *bitmap_git, const struct object_id *oid) { int pos; if (bitmap_is_midx(bitmap_git)) pos = bitmap_position_midx(bitmap_git, oid); else pos = bitmap_position_packfile(bitmap_git, oid); return (pos >= 0) ? pos : bitmap_position_extended(bitmap_git, oid); } static int ext_index_add_object(struct bitmap_index *bitmap_git, struct object *object, const char *name) { struct eindex *eindex = &bitmap_git->ext_index; khiter_t hash_pos; int hash_ret; int bitmap_pos; hash_pos = kh_put_oid_pos(eindex->positions, object->oid, &hash_ret); if (hash_ret > 0) { if (eindex->count >= eindex->alloc) { eindex->alloc = (eindex->alloc + 16) * 3 / 2; REALLOC_ARRAY(eindex->objects, eindex->alloc); REALLOC_ARRAY(eindex->hashes, eindex->alloc); } bitmap_pos = eindex->count; eindex->objects[eindex->count] = object; eindex->hashes[eindex->count] = pack_name_hash(name); kh_value(eindex->positions, hash_pos) = bitmap_pos; eindex->count++; } else { bitmap_pos = kh_value(eindex->positions, hash_pos); } return bitmap_pos + bitmap_num_objects(bitmap_git); } struct bitmap_show_data { struct bitmap_index *bitmap_git; struct bitmap *base; }; static void show_object(struct object *object, const char *name, void *data_) { struct bitmap_show_data *data = data_; int bitmap_pos; bitmap_pos = bitmap_position(data->bitmap_git, &object->oid); if (bitmap_pos < 0) bitmap_pos = ext_index_add_object(data->bitmap_git, object, name); bitmap_set(data->base, bitmap_pos); } static void show_commit(struct commit *commit UNUSED, void *data UNUSED) { } static unsigned apply_pseudo_merges_for_commit_1(struct bitmap_index *bitmap_git, struct bitmap *result, struct commit *commit, uint32_t commit_pos) { int ret; ret = apply_pseudo_merges_for_commit(&bitmap_git->pseudo_merges, result, commit, commit_pos); if (ret) pseudo_merges_satisfied_nr += ret; return ret; } static int add_to_include_set(struct bitmap_index *bitmap_git, struct include_data *data, struct commit *commit, int bitmap_pos) { struct ewah_bitmap *partial; if (data->seen && bitmap_get(data->seen, bitmap_pos)) return 0; if (bitmap_get(data->base, bitmap_pos)) return 0; partial = bitmap_for_commit(bitmap_git, commit); if (partial) { existing_bitmaps_hits_nr++; bitmap_or_ewah(data->base, partial); return 0; } existing_bitmaps_misses_nr++; bitmap_set(data->base, bitmap_pos); if (apply_pseudo_merges_for_commit_1(bitmap_git, data->base, commit, bitmap_pos)) return 0; return 1; } static int should_include(struct commit *commit, void *_data) { struct include_data *data = _data; int bitmap_pos; bitmap_pos = bitmap_position(data->bitmap_git, &commit->object.oid); if (bitmap_pos < 0) bitmap_pos = ext_index_add_object(data->bitmap_git, (struct object *)commit, NULL); if (!add_to_include_set(data->bitmap_git, data, commit, bitmap_pos)) { struct commit_list *parent = commit->parents; while (parent) { parent->item->object.flags |= SEEN; parent = parent->next; } return 0; } return 1; } static int should_include_obj(struct object *obj, void *_data) { struct include_data *data = _data; int bitmap_pos; bitmap_pos = bitmap_position(data->bitmap_git, &obj->oid); if (bitmap_pos < 0) return 1; if ((data->seen && bitmap_get(data->seen, bitmap_pos)) || bitmap_get(data->base, bitmap_pos)) { obj->flags |= SEEN; return 0; } return 1; } static int add_commit_to_bitmap(struct bitmap_index *bitmap_git, struct bitmap **base, struct commit *commit) { struct ewah_bitmap *or_with = bitmap_for_commit(bitmap_git, commit); if (!or_with) { existing_bitmaps_misses_nr++; return 0; } existing_bitmaps_hits_nr++; if (!*base) *base = ewah_to_bitmap(or_with); else bitmap_or_ewah(*base, or_with); return 1; } static struct bitmap *fill_in_bitmap(struct bitmap_index *bitmap_git, struct rev_info *revs, struct bitmap *base, struct bitmap *seen) { struct include_data incdata; struct bitmap_show_data show_data; if (!base) base = bitmap_new(); incdata.bitmap_git = bitmap_git; incdata.base = base; incdata.seen = seen; revs->include_check = should_include; revs->include_check_obj = should_include_obj; revs->include_check_data = &incdata; if (prepare_revision_walk(revs)) die(_("revision walk setup failed")); show_data.bitmap_git = bitmap_git; show_data.base = base; traverse_commit_list(revs, show_commit, show_object, &show_data); revs->include_check = NULL; revs->include_check_obj = NULL; revs->include_check_data = NULL; return base; } struct bitmap_boundary_cb { struct bitmap_index *bitmap_git; struct bitmap *base; struct object_array boundary; }; static void show_boundary_commit(struct commit *commit, void *_data) { struct bitmap_boundary_cb *data = _data; if (commit->object.flags & BOUNDARY) add_object_array(&commit->object, "", &data->boundary); if (commit->object.flags & UNINTERESTING) { if (bitmap_walk_contains(data->bitmap_git, data->base, &commit->object.oid)) return; add_commit_to_bitmap(data->bitmap_git, &data->base, commit); } } static void show_boundary_object(struct object *object UNUSED, const char *name UNUSED, void *data UNUSED) { BUG("should not be called"); } static unsigned cascade_pseudo_merges_1(struct bitmap_index *bitmap_git, struct bitmap *result, struct bitmap *roots) { int ret = cascade_pseudo_merges(&bitmap_git->pseudo_merges, result, roots); if (ret) { pseudo_merges_cascades_nr++; pseudo_merges_satisfied_nr += ret; } return ret; } static struct bitmap *find_boundary_objects(struct bitmap_index *bitmap_git, struct rev_info *revs, struct object_list *roots) { struct bitmap_boundary_cb cb; struct object_list *root; unsigned int i; unsigned int tmp_blobs, tmp_trees, tmp_tags; int any_missing = 0; int existing_bitmaps = 0; cb.bitmap_git = bitmap_git; cb.base = bitmap_new(); object_array_init(&cb.boundary); revs->ignore_missing_links = 1; if (bitmap_git->pseudo_merges.nr) { struct bitmap *roots_bitmap = bitmap_new(); struct object_list *objects = NULL; for (objects = roots; objects; objects = objects->next) { struct object *object = objects->item; int pos; pos = bitmap_position(bitmap_git, &object->oid); if (pos < 0) continue; bitmap_set(roots_bitmap, pos); } if (!cascade_pseudo_merges_1(bitmap_git, cb.base, roots_bitmap)) bitmap_free(roots_bitmap); } /* * OR in any existing reachability bitmaps among `roots` into * `cb.base`. */ for (root = roots; root; root = root->next) { struct object *object = root->item; if (object->type != OBJ_COMMIT || bitmap_walk_contains(bitmap_git, cb.base, &object->oid)) continue; if (add_commit_to_bitmap(bitmap_git, &cb.base, (struct commit *)object)) { existing_bitmaps = 1; continue; } any_missing = 1; } if (!any_missing) goto cleanup; if (existing_bitmaps) cascade_pseudo_merges_1(bitmap_git, cb.base, NULL); tmp_blobs = revs->blob_objects; tmp_trees = revs->tree_objects; tmp_tags = revs->blob_objects; revs->blob_objects = 0; revs->tree_objects = 0; revs->tag_objects = 0; /* * We didn't have complete coverage of the roots. First setup a * revision walk to (a) OR in any bitmaps that are UNINTERESTING * between the tips and boundary, and (b) record the boundary. */ trace2_region_enter("pack-bitmap", "boundary-prepare", the_repository); if (prepare_revision_walk(revs)) die("revision walk setup failed"); trace2_region_leave("pack-bitmap", "boundary-prepare", the_repository); trace2_region_enter("pack-bitmap", "boundary-traverse", the_repository); revs->boundary = 1; traverse_commit_list_filtered(revs, show_boundary_commit, show_boundary_object, &cb, NULL); revs->boundary = 0; trace2_region_leave("pack-bitmap", "boundary-traverse", the_repository); revs->blob_objects = tmp_blobs; revs->tree_objects = tmp_trees; revs->tag_objects = tmp_tags; reset_revision_walk(); clear_object_flags(UNINTERESTING); /* * Then add the boundary commit(s) as fill-in traversal tips. */ trace2_region_enter("pack-bitmap", "boundary-fill-in", the_repository); for (i = 0; i < cb.boundary.nr; i++) { struct object *obj = cb.boundary.objects[i].item; if (bitmap_walk_contains(bitmap_git, cb.base, &obj->oid)) obj->flags |= SEEN; else add_pending_object(revs, obj, ""); } if (revs->pending.nr) cb.base = fill_in_bitmap(bitmap_git, revs, cb.base, NULL); trace2_region_leave("pack-bitmap", "boundary-fill-in", the_repository); cleanup: object_array_clear(&cb.boundary); revs->ignore_missing_links = 0; return cb.base; } struct ewah_bitmap *pseudo_merge_bitmap_for_commit(struct bitmap_index *bitmap_git, struct commit *commit) { struct commit_list *p; struct bitmap *parents; struct pseudo_merge *match = NULL; if (!bitmap_git->pseudo_merges.nr) return NULL; parents = bitmap_new(); for (p = commit->parents; p; p = p->next) { int pos = bitmap_position(bitmap_git, &p->item->object.oid); if (pos < 0 || pos >= bitmap_num_objects(bitmap_git)) goto done; bitmap_set(parents, pos); } match = pseudo_merge_for_parents(&bitmap_git->pseudo_merges, parents); done: bitmap_free(parents); if (match) return pseudo_merge_bitmap(&bitmap_git->pseudo_merges, match); return NULL; } static void unsatisfy_all_pseudo_merges(struct bitmap_index *bitmap_git) { uint32_t i; for (i = 0; i < bitmap_git->pseudo_merges.nr; i++) bitmap_git->pseudo_merges.v[i].satisfied = 0; } static struct bitmap *find_objects(struct bitmap_index *bitmap_git, struct rev_info *revs, struct object_list *roots, struct bitmap *seen) { struct bitmap *base = NULL; int needs_walk = 0; unsigned existing_bitmaps = 0; struct object_list *not_mapped = NULL; unsatisfy_all_pseudo_merges(bitmap_git); if (bitmap_git->pseudo_merges.nr) { struct bitmap *roots_bitmap = bitmap_new(); struct object_list *objects = NULL; for (objects = roots; objects; objects = objects->next) { struct object *object = objects->item; int pos; pos = bitmap_position(bitmap_git, &object->oid); if (pos < 0) continue; bitmap_set(roots_bitmap, pos); } base = bitmap_new(); cascade_pseudo_merges_1(bitmap_git, base, roots_bitmap); bitmap_free(roots_bitmap); } /* * Go through all the roots for the walk. The ones that have bitmaps * on the bitmap index will be `or`ed together to form an initial * global reachability analysis. * * The ones without bitmaps in the index will be stored in the * `not_mapped_list` for further processing. */ while (roots) { struct object *object = roots->item; roots = roots->next; if (base) { int pos = bitmap_position(bitmap_git, &object->oid); if (pos > 0 && bitmap_get(base, pos)) { object->flags |= SEEN; continue; } } if (object->type == OBJ_COMMIT && add_commit_to_bitmap(bitmap_git, &base, (struct commit *)object)) { object->flags |= SEEN; existing_bitmaps = 1; continue; } object_list_insert(object, ¬_mapped); } /* * Best case scenario: We found bitmaps for all the roots, * so the resulting `or` bitmap has the full reachability analysis */ if (!not_mapped) return base; roots = not_mapped; if (existing_bitmaps) cascade_pseudo_merges_1(bitmap_git, base, NULL); /* * Let's iterate through all the roots that don't have bitmaps to * check if we can determine them to be reachable from the existing * global bitmap. * * If we cannot find them in the existing global bitmap, we'll need * to push them to an actual walk and run it until we can confirm * they are reachable */ while (roots) { struct object *object = roots->item; int pos; roots = roots->next; pos = bitmap_position(bitmap_git, &object->oid); if (pos < 0 || base == NULL || !bitmap_get(base, pos)) { object->flags &= ~UNINTERESTING; add_pending_object(revs, object, ""); needs_walk = 1; roots_without_bitmaps_nr++; } else { object->flags |= SEEN; roots_with_bitmaps_nr++; } } if (needs_walk) { /* * This fill-in traversal may walk over some objects * again, since we have already traversed in order to * find the boundary. * * But this extra walk should be extremely cheap, since * all commit objects are loaded into memory, and * because we skip walking to parents that are * UNINTERESTING, since it will be marked in the haves * bitmap already (or it has an on-disk bitmap, since * OR-ing it in covers all of its ancestors). */ base = fill_in_bitmap(bitmap_git, revs, base, seen); } object_list_free(¬_mapped); return base; } static void show_extended_objects(struct bitmap_index *bitmap_git, struct rev_info *revs, show_reachable_fn show_reach) { struct bitmap *objects = bitmap_git->result; struct eindex *eindex = &bitmap_git->ext_index; uint32_t i; for (i = 0; i < eindex->count; ++i) { struct object *obj; if (!bitmap_get(objects, st_add(bitmap_num_objects(bitmap_git), i))) continue; obj = eindex->objects[i]; if ((obj->type == OBJ_BLOB && !revs->blob_objects) || (obj->type == OBJ_TREE && !revs->tree_objects) || (obj->type == OBJ_TAG && !revs->tag_objects)) continue; show_reach(&obj->oid, obj->type, 0, eindex->hashes[i], NULL, 0); } } static void init_type_iterator(struct ewah_iterator *it, struct bitmap_index *bitmap_git, enum object_type type) { switch (type) { case OBJ_COMMIT: ewah_iterator_init(it, bitmap_git->commits); break; case OBJ_TREE: ewah_iterator_init(it, bitmap_git->trees); break; case OBJ_BLOB: ewah_iterator_init(it, bitmap_git->blobs); break; case OBJ_TAG: ewah_iterator_init(it, bitmap_git->tags); break; default: BUG("object type %d not stored by bitmap type index", type); break; } } static void show_objects_for_type( struct bitmap_index *bitmap_git, enum object_type object_type, show_reachable_fn show_reach) { size_t i = 0; uint32_t offset; struct ewah_iterator it; eword_t filter; struct bitmap *objects = bitmap_git->result; init_type_iterator(&it, bitmap_git, object_type); for (i = 0; i < objects->word_alloc && ewah_iterator_next(&filter, &it); i++) { eword_t word = objects->words[i] & filter; size_t pos = (i * BITS_IN_EWORD); if (!word) continue; for (offset = 0; offset < BITS_IN_EWORD; ++offset) { struct packed_git *pack; struct object_id oid; uint32_t hash = 0, index_pos; off_t ofs; if ((word >> offset) == 0) break; offset += ewah_bit_ctz64(word >> offset); if (bitmap_is_midx(bitmap_git)) { struct multi_pack_index *m = bitmap_git->midx; uint32_t pack_id; index_pos = pack_pos_to_midx(m, pos + offset); ofs = nth_midxed_offset(m, index_pos); nth_midxed_object_oid(&oid, m, index_pos); pack_id = nth_midxed_pack_int_id(m, index_pos); pack = bitmap_git->midx->packs[pack_id]; } else { index_pos = pack_pos_to_index(bitmap_git->pack, pos + offset); ofs = pack_pos_to_offset(bitmap_git->pack, pos + offset); nth_bitmap_object_oid(bitmap_git, &oid, index_pos); pack = bitmap_git->pack; } if (bitmap_git->hashes) hash = get_be32(bitmap_git->hashes + index_pos); show_reach(&oid, object_type, 0, hash, pack, ofs); } } } static int in_bitmapped_pack(struct bitmap_index *bitmap_git, struct object_list *roots) { while (roots) { struct object *object = roots->item; roots = roots->next; if (bitmap_is_midx(bitmap_git)) { if (bsearch_midx(&object->oid, bitmap_git->midx, NULL)) return 1; } else { if (find_pack_entry_one(&object->oid, bitmap_git->pack) > 0) return 1; } } return 0; } static struct bitmap *find_tip_objects(struct bitmap_index *bitmap_git, struct object_list *tip_objects, enum object_type type) { struct bitmap *result = bitmap_new(); struct object_list *p; for (p = tip_objects; p; p = p->next) { int pos; if (p->item->type != type) continue; pos = bitmap_position(bitmap_git, &p->item->oid); if (pos < 0) continue; bitmap_set(result, pos); } return result; } static void filter_bitmap_exclude_type(struct bitmap_index *bitmap_git, struct object_list *tip_objects, struct bitmap *to_filter, enum object_type type) { struct eindex *eindex = &bitmap_git->ext_index; struct bitmap *tips; struct ewah_iterator it; eword_t mask; uint32_t i; /* * The non-bitmap version of this filter never removes * objects which the other side specifically asked for, * so we must match that behavior. */ tips = find_tip_objects(bitmap_git, tip_objects, type); /* * We can use the type-level bitmap for 'type' to work in whole * words for the objects that are actually in the bitmapped * packfile. */ for (i = 0, init_type_iterator(&it, bitmap_git, type); i < to_filter->word_alloc && ewah_iterator_next(&mask, &it); i++) { if (i < tips->word_alloc) mask &= ~tips->words[i]; to_filter->words[i] &= ~mask; } /* * Clear any objects that weren't in the packfile (and so would * not have been caught by the loop above. We'll have to check * them individually. */ for (i = 0; i < eindex->count; i++) { size_t pos = st_add(i, bitmap_num_objects(bitmap_git)); if (eindex->objects[i]->type == type && bitmap_get(to_filter, pos) && !bitmap_get(tips, pos)) bitmap_unset(to_filter, pos); } bitmap_free(tips); } static void filter_bitmap_blob_none(struct bitmap_index *bitmap_git, struct object_list *tip_objects, struct bitmap *to_filter) { filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_BLOB); } static unsigned long get_size_by_pos(struct bitmap_index *bitmap_git, uint32_t pos) { unsigned long size; struct object_info oi = OBJECT_INFO_INIT; oi.sizep = &size; if (pos < bitmap_num_objects(bitmap_git)) { struct packed_git *pack; off_t ofs; if (bitmap_is_midx(bitmap_git)) { uint32_t midx_pos = pack_pos_to_midx(bitmap_git->midx, pos); uint32_t pack_id = nth_midxed_pack_int_id(bitmap_git->midx, midx_pos); pack = bitmap_git->midx->packs[pack_id]; ofs = nth_midxed_offset(bitmap_git->midx, midx_pos); } else { pack = bitmap_git->pack; ofs = pack_pos_to_offset(pack, pos); } if (packed_object_info(the_repository, pack, ofs, &oi) < 0) { struct object_id oid; nth_bitmap_object_oid(bitmap_git, &oid, pack_pos_to_index(pack, pos)); die(_("unable to get size of %s"), oid_to_hex(&oid)); } } else { struct eindex *eindex = &bitmap_git->ext_index; struct object *obj = eindex->objects[pos - bitmap_num_objects(bitmap_git)]; if (oid_object_info_extended(the_repository, &obj->oid, &oi, 0) < 0) die(_("unable to get size of %s"), oid_to_hex(&obj->oid)); } return size; } static void filter_bitmap_blob_limit(struct bitmap_index *bitmap_git, struct object_list *tip_objects, struct bitmap *to_filter, unsigned long limit) { struct eindex *eindex = &bitmap_git->ext_index; struct bitmap *tips; struct ewah_iterator it; eword_t mask; uint32_t i; tips = find_tip_objects(bitmap_git, tip_objects, OBJ_BLOB); for (i = 0, init_type_iterator(&it, bitmap_git, OBJ_BLOB); i < to_filter->word_alloc && ewah_iterator_next(&mask, &it); i++) { eword_t word = to_filter->words[i] & mask; unsigned offset; for (offset = 0; offset < BITS_IN_EWORD; offset++) { uint32_t pos; if ((word >> offset) == 0) break; offset += ewah_bit_ctz64(word >> offset); pos = i * BITS_IN_EWORD + offset; if (!bitmap_get(tips, pos) && get_size_by_pos(bitmap_git, pos) >= limit) bitmap_unset(to_filter, pos); } } for (i = 0; i < eindex->count; i++) { size_t pos = st_add(i, bitmap_num_objects(bitmap_git)); if (eindex->objects[i]->type == OBJ_BLOB && bitmap_get(to_filter, pos) && !bitmap_get(tips, pos) && get_size_by_pos(bitmap_git, pos) >= limit) bitmap_unset(to_filter, pos); } bitmap_free(tips); } static void filter_bitmap_tree_depth(struct bitmap_index *bitmap_git, struct object_list *tip_objects, struct bitmap *to_filter, unsigned long limit) { if (limit) BUG("filter_bitmap_tree_depth given non-zero limit"); filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_TREE); filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_BLOB); } static void filter_bitmap_object_type(struct bitmap_index *bitmap_git, struct object_list *tip_objects, struct bitmap *to_filter, enum object_type object_type) { if (object_type < OBJ_COMMIT || object_type > OBJ_TAG) BUG("filter_bitmap_object_type given invalid object"); if (object_type != OBJ_TAG) filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_TAG); if (object_type != OBJ_COMMIT) filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_COMMIT); if (object_type != OBJ_TREE) filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_TREE); if (object_type != OBJ_BLOB) filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_BLOB); } static int filter_bitmap(struct bitmap_index *bitmap_git, struct object_list *tip_objects, struct bitmap *to_filter, struct list_objects_filter_options *filter) { if (!filter || filter->choice == LOFC_DISABLED) return 0; if (filter->choice == LOFC_BLOB_NONE) { if (bitmap_git) filter_bitmap_blob_none(bitmap_git, tip_objects, to_filter); return 0; } if (filter->choice == LOFC_BLOB_LIMIT) { if (bitmap_git) filter_bitmap_blob_limit(bitmap_git, tip_objects, to_filter, filter->blob_limit_value); return 0; } if (filter->choice == LOFC_TREE_DEPTH && filter->tree_exclude_depth == 0) { if (bitmap_git) filter_bitmap_tree_depth(bitmap_git, tip_objects, to_filter, filter->tree_exclude_depth); return 0; } if (filter->choice == LOFC_OBJECT_TYPE) { if (bitmap_git) filter_bitmap_object_type(bitmap_git, tip_objects, to_filter, filter->object_type); return 0; } if (filter->choice == LOFC_COMBINE) { int i; for (i = 0; i < filter->sub_nr; i++) { if (filter_bitmap(bitmap_git, tip_objects, to_filter, &filter->sub[i]) < 0) return -1; } return 0; } /* filter choice not handled */ return -1; } static int can_filter_bitmap(struct list_objects_filter_options *filter) { return !filter_bitmap(NULL, NULL, NULL, filter); } static void filter_packed_objects_from_bitmap(struct bitmap_index *bitmap_git, struct bitmap *result) { struct eindex *eindex = &bitmap_git->ext_index; uint32_t objects_nr; size_t i, pos; objects_nr = bitmap_num_objects(bitmap_git); pos = objects_nr / BITS_IN_EWORD; if (pos > result->word_alloc) pos = result->word_alloc; memset(result->words, 0x00, sizeof(eword_t) * pos); for (i = pos * BITS_IN_EWORD; i < objects_nr; i++) bitmap_unset(result, i); for (i = 0; i < eindex->count; ++i) { if (has_object_pack(&eindex->objects[i]->oid)) bitmap_unset(result, objects_nr + i); } } struct bitmap_index *prepare_bitmap_walk(struct rev_info *revs, int filter_provided_objects) { unsigned int i; int use_boundary_traversal; struct object_list *wants = NULL; struct object_list *haves = NULL; struct bitmap *wants_bitmap = NULL; struct bitmap *haves_bitmap = NULL; struct bitmap_index *bitmap_git; /* * We can't do pathspec limiting with bitmaps, because we don't know * which commits are associated with which object changes (let alone * even which objects are associated with which paths). */ if (revs->prune) return NULL; if (!can_filter_bitmap(&revs->filter)) return NULL; /* try to open a bitmapped pack, but don't parse it yet * because we may not need to use it */ CALLOC_ARRAY(bitmap_git, 1); if (open_bitmap(revs->repo, bitmap_git) < 0) goto cleanup; for (i = 0; i < revs->pending.nr; ++i) { struct object *object = revs->pending.objects[i].item; if (object->type == OBJ_NONE) parse_object_or_die(&object->oid, NULL); while (object->type == OBJ_TAG) { struct tag *tag = (struct tag *) object; if (object->flags & UNINTERESTING) object_list_insert(object, &haves); else object_list_insert(object, &wants); object = parse_object_or_die(get_tagged_oid(tag), NULL); object->flags |= (tag->object.flags & UNINTERESTING); } if (object->flags & UNINTERESTING) object_list_insert(object, &haves); else object_list_insert(object, &wants); } use_boundary_traversal = git_env_bool(GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL, -1); if (use_boundary_traversal < 0) { prepare_repo_settings(revs->repo); use_boundary_traversal = revs->repo->settings.pack_use_bitmap_boundary_traversal; } if (!use_boundary_traversal) { /* * if we have a HAVES list, but none of those haves is contained * in the packfile that has a bitmap, we don't have anything to * optimize here */ if (haves && !in_bitmapped_pack(bitmap_git, haves)) goto cleanup; } /* if we don't want anything, we're done here */ if (!wants) goto cleanup; /* * now we're going to use bitmaps, so load the actual bitmap entries * from disk. this is the point of no return; after this the rev_list * becomes invalidated and we must perform the revwalk through bitmaps */ if (load_bitmap(revs->repo, bitmap_git) < 0) goto cleanup; if (!use_boundary_traversal) object_array_clear(&revs->pending); if (haves) { if (use_boundary_traversal) { trace2_region_enter("pack-bitmap", "haves/boundary", the_repository); haves_bitmap = find_boundary_objects(bitmap_git, revs, haves); trace2_region_leave("pack-bitmap", "haves/boundary", the_repository); } else { trace2_region_enter("pack-bitmap", "haves/classic", the_repository); revs->ignore_missing_links = 1; haves_bitmap = find_objects(bitmap_git, revs, haves, NULL); reset_revision_walk(); revs->ignore_missing_links = 0; trace2_region_leave("pack-bitmap", "haves/classic", the_repository); } if (!haves_bitmap) BUG("failed to perform bitmap walk"); } if (use_boundary_traversal) { object_array_clear(&revs->pending); reset_revision_walk(); } wants_bitmap = find_objects(bitmap_git, revs, wants, haves_bitmap); if (!wants_bitmap) BUG("failed to perform bitmap walk"); if (haves_bitmap) bitmap_and_not(wants_bitmap, haves_bitmap); filter_bitmap(bitmap_git, (revs->filter.choice && filter_provided_objects) ? NULL : wants, wants_bitmap, &revs->filter); if (revs->unpacked) filter_packed_objects_from_bitmap(bitmap_git, wants_bitmap); bitmap_git->result = wants_bitmap; bitmap_git->haves = haves_bitmap; object_list_free(&wants); object_list_free(&haves); trace2_data_intmax("bitmap", the_repository, "pseudo_merges_satisfied", pseudo_merges_satisfied_nr); trace2_data_intmax("bitmap", the_repository, "pseudo_merges_cascades", pseudo_merges_cascades_nr); trace2_data_intmax("bitmap", the_repository, "bitmap/hits", existing_bitmaps_hits_nr); trace2_data_intmax("bitmap", the_repository, "bitmap/misses", existing_bitmaps_misses_nr); trace2_data_intmax("bitmap", the_repository, "bitmap/roots_with_bitmap", roots_with_bitmaps_nr); trace2_data_intmax("bitmap", the_repository, "bitmap/roots_without_bitmap", roots_without_bitmaps_nr); return bitmap_git; cleanup: free_bitmap_index(bitmap_git); object_list_free(&wants); object_list_free(&haves); return NULL; } /* * -1 means "stop trying further objects"; 0 means we may or may not have * reused, but you can keep feeding bits. */ static int try_partial_reuse(struct bitmap_index *bitmap_git, struct bitmapped_pack *pack, size_t bitmap_pos, uint32_t pack_pos, off_t offset, struct bitmap *reuse, struct pack_window **w_curs) { off_t delta_obj_offset; enum object_type type; unsigned long size; if (pack_pos >= pack->p->num_objects) return -1; /* not actually in the pack */ delta_obj_offset = offset; type = unpack_object_header(pack->p, w_curs, &offset, &size); if (type < 0) return -1; /* broken packfile, punt */ if (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA) { off_t base_offset; uint32_t base_pos; uint32_t base_bitmap_pos; /* * Find the position of the base object so we can look it up * in our bitmaps. If we can't come up with an offset, or if * that offset is not in the revidx, the pack is corrupt. * There's nothing we can do, so just punt on this object, * and the normal slow path will complain about it in * more detail. */ base_offset = get_delta_base(pack->p, w_curs, &offset, type, delta_obj_offset); if (!base_offset) return 0; offset_to_pack_pos(pack->p, base_offset, &base_pos); if (bitmap_is_midx(bitmap_git)) { /* * Cross-pack deltas are rejected for now, but could * theoretically be supported in the future. * * We would need to ensure that we're sending both * halves of the delta/base pair, regardless of whether * or not the two cross a pack boundary. If they do, * then we must convert the delta to an REF_DELTA to * refer back to the base in the other pack. * */ if (midx_pair_to_pack_pos(bitmap_git->midx, pack->pack_int_id, base_offset, &base_bitmap_pos) < 0) { return 0; } } else { if (offset_to_pack_pos(pack->p, base_offset, &base_pos) < 0) return 0; /* * We assume delta dependencies always point backwards. * This lets us do a single pass, and is basically * always true due to the way OFS_DELTAs work. You would * not typically find REF_DELTA in a bitmapped pack, * since we only bitmap packs we write fresh, and * OFS_DELTA is the default). But let's double check to * make sure the pack wasn't written with odd * parameters. */ if (base_pos >= pack_pos) return 0; base_bitmap_pos = pack->bitmap_pos + base_pos; } /* * And finally, if we're not sending the base as part of our * reuse chunk, then don't send this object either. The base * would come after us, along with other objects not * necessarily in the pack, which means we'd need to convert * to REF_DELTA on the fly. Better to just let the normal * object_entry code path handle it. */ if (!bitmap_get(reuse, base_bitmap_pos)) return 0; } /* * If we got here, then the object is OK to reuse. Mark it. */ bitmap_set(reuse, bitmap_pos); return 0; } static void reuse_partial_packfile_from_bitmap_1(struct bitmap_index *bitmap_git, struct bitmapped_pack *pack, struct bitmap *reuse) { struct bitmap *result = bitmap_git->result; struct pack_window *w_curs = NULL; size_t pos = pack->bitmap_pos / BITS_IN_EWORD; if (!pack->bitmap_pos) { /* * If we're processing the first (in the case of a MIDX, the * preferred pack) or the only (in the case of single-pack * bitmaps) pack, then we can reuse whole words at a time. * * This is because we know that any deltas in this range *must* * have their bases chosen from the same pack, since: * * - In the single pack case, there is no other pack to choose * them from. * * - In the MIDX case, the first pack is the preferred pack, so * all ties are broken in favor of that pack (i.e. the one * we're currently processing). So any duplicate bases will be * resolved in favor of the pack we're processing. */ while (pos < result->word_alloc && pos < pack->bitmap_nr / BITS_IN_EWORD && result->words[pos] == (eword_t)~0) pos++; memset(reuse->words, 0xFF, pos * sizeof(eword_t)); } for (; pos < result->word_alloc; pos++) { eword_t word = result->words[pos]; size_t offset; for (offset = 0; offset < BITS_IN_EWORD; offset++) { size_t bit_pos; uint32_t pack_pos; off_t ofs; if (word >> offset == 0) break; offset += ewah_bit_ctz64(word >> offset); bit_pos = pos * BITS_IN_EWORD + offset; if (bit_pos < pack->bitmap_pos) continue; if (bit_pos >= pack->bitmap_pos + pack->bitmap_nr) goto done; if (bitmap_is_midx(bitmap_git)) { uint32_t midx_pos; midx_pos = pack_pos_to_midx(bitmap_git->midx, bit_pos); ofs = nth_midxed_offset(bitmap_git->midx, midx_pos); if (offset_to_pack_pos(pack->p, ofs, &pack_pos) < 0) BUG("could not find object in pack %s " "at offset %"PRIuMAX" in MIDX", pack_basename(pack->p), (uintmax_t)ofs); } else { pack_pos = cast_size_t_to_uint32_t(st_sub(bit_pos, pack->bitmap_pos)); if (pack_pos >= pack->p->num_objects) BUG("advanced beyond the end of pack %s (%"PRIuMAX" > %"PRIu32")", pack_basename(pack->p), (uintmax_t)pack_pos, pack->p->num_objects); ofs = pack_pos_to_offset(pack->p, pack_pos); } if (try_partial_reuse(bitmap_git, pack, bit_pos, pack_pos, ofs, reuse, &w_curs) < 0) { /* * try_partial_reuse indicated we couldn't reuse * any bits, so there is no point in trying more * bits in the current word, or any other words * in result. * * Jump out of both loops to avoid future * unnecessary calls to try_partial_reuse. */ goto done; } } } done: unuse_pack(&w_curs); } static int bitmapped_pack_cmp(const void *va, const void *vb) { const struct bitmapped_pack *a = va; const struct bitmapped_pack *b = vb; if (a->bitmap_pos < b->bitmap_pos) return -1; if (a->bitmap_pos > b->bitmap_pos) return 1; return 0; } void reuse_partial_packfile_from_bitmap(struct bitmap_index *bitmap_git, struct bitmapped_pack **packs_out, size_t *packs_nr_out, struct bitmap **reuse_out, int multi_pack_reuse) { struct repository *r = the_repository; struct bitmapped_pack *packs = NULL; struct bitmap *result = bitmap_git->result; struct bitmap *reuse; size_t i; size_t packs_nr = 0, packs_alloc = 0; size_t word_alloc; uint32_t objects_nr = 0; assert(result); load_reverse_index(r, bitmap_git); if (!bitmap_is_midx(bitmap_git) || !bitmap_git->midx->chunk_bitmapped_packs) multi_pack_reuse = 0; if (multi_pack_reuse) { for (i = 0; i < bitmap_git->midx->num_packs; i++) { struct bitmapped_pack pack; if (nth_bitmapped_pack(r, bitmap_git->midx, &pack, i) < 0) { warning(_("unable to load pack: '%s', disabling pack-reuse"), bitmap_git->midx->pack_names[i]); free(packs); return; } if (!pack.bitmap_nr) continue; ALLOC_GROW(packs, packs_nr + 1, packs_alloc); memcpy(&packs[packs_nr++], &pack, sizeof(pack)); objects_nr += pack.p->num_objects; } QSORT(packs, packs_nr, bitmapped_pack_cmp); } else { struct packed_git *pack; uint32_t pack_int_id; if (bitmap_is_midx(bitmap_git)) { uint32_t preferred_pack_pos; if (midx_preferred_pack(bitmap_git->midx, &preferred_pack_pos) < 0) { warning(_("unable to compute preferred pack, disabling pack-reuse")); return; } pack = bitmap_git->midx->packs[preferred_pack_pos]; pack_int_id = preferred_pack_pos; } else { pack = bitmap_git->pack; /* * Any value for 'pack_int_id' will do here. When we * process the pack via try_partial_reuse(), we won't * use the `pack_int_id` field since we have a non-MIDX * bitmap. * * Use '-1' as a sentinel value to make it clear * that we do not expect to read this field. */ pack_int_id = -1; } ALLOC_GROW(packs, packs_nr + 1, packs_alloc); packs[packs_nr].p = pack; packs[packs_nr].pack_int_id = pack_int_id; packs[packs_nr].bitmap_nr = pack->num_objects; packs[packs_nr].bitmap_pos = 0; packs[packs_nr].from_midx = bitmap_git->midx; objects_nr = packs[packs_nr++].bitmap_nr; } word_alloc = objects_nr / BITS_IN_EWORD; if (objects_nr % BITS_IN_EWORD) word_alloc++; reuse = bitmap_word_alloc(word_alloc); for (i = 0; i < packs_nr; i++) reuse_partial_packfile_from_bitmap_1(bitmap_git, &packs[i], reuse); if (bitmap_is_empty(reuse)) { free(packs); bitmap_free(reuse); return; } /* * Drop any reused objects from the result, since they will not * need to be handled separately. */ bitmap_and_not(result, reuse); *packs_out = packs; *packs_nr_out = packs_nr; *reuse_out = reuse; } int bitmap_walk_contains(struct bitmap_index *bitmap_git, struct bitmap *bitmap, const struct object_id *oid) { int idx; if (!bitmap) return 0; idx = bitmap_position(bitmap_git, oid); return idx >= 0 && bitmap_get(bitmap, idx); } void traverse_bitmap_commit_list(struct bitmap_index *bitmap_git, struct rev_info *revs, show_reachable_fn show_reachable) { assert(bitmap_git->result); show_objects_for_type(bitmap_git, OBJ_COMMIT, show_reachable); if (revs->tree_objects) show_objects_for_type(bitmap_git, OBJ_TREE, show_reachable); if (revs->blob_objects) show_objects_for_type(bitmap_git, OBJ_BLOB, show_reachable); if (revs->tag_objects) show_objects_for_type(bitmap_git, OBJ_TAG, show_reachable); show_extended_objects(bitmap_git, revs, show_reachable); } static uint32_t count_object_type(struct bitmap_index *bitmap_git, enum object_type type) { struct bitmap *objects = bitmap_git->result; struct eindex *eindex = &bitmap_git->ext_index; uint32_t i = 0, count = 0; struct ewah_iterator it; eword_t filter; init_type_iterator(&it, bitmap_git, type); while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) { eword_t word = objects->words[i++] & filter; count += ewah_bit_popcount64(word); } for (i = 0; i < eindex->count; ++i) { if (eindex->objects[i]->type == type && bitmap_get(objects, st_add(bitmap_num_objects(bitmap_git), i))) count++; } return count; } void count_bitmap_commit_list(struct bitmap_index *bitmap_git, uint32_t *commits, uint32_t *trees, uint32_t *blobs, uint32_t *tags) { assert(bitmap_git->result); if (commits) *commits = count_object_type(bitmap_git, OBJ_COMMIT); if (trees) *trees = count_object_type(bitmap_git, OBJ_TREE); if (blobs) *blobs = count_object_type(bitmap_git, OBJ_BLOB); if (tags) *tags = count_object_type(bitmap_git, OBJ_TAG); } struct bitmap_test_data { struct bitmap_index *bitmap_git; struct bitmap *base; struct bitmap *commits; struct bitmap *trees; struct bitmap *blobs; struct bitmap *tags; struct progress *prg; size_t seen; }; static void test_bitmap_type(struct bitmap_test_data *tdata, struct object *obj, int pos) { enum object_type bitmap_type = OBJ_NONE; int bitmaps_nr = 0; if (bitmap_get(tdata->commits, pos)) { bitmap_type = OBJ_COMMIT; bitmaps_nr++; } if (bitmap_get(tdata->trees, pos)) { bitmap_type = OBJ_TREE; bitmaps_nr++; } if (bitmap_get(tdata->blobs, pos)) { bitmap_type = OBJ_BLOB; bitmaps_nr++; } if (bitmap_get(tdata->tags, pos)) { bitmap_type = OBJ_TAG; bitmaps_nr++; } if (bitmap_type == OBJ_NONE) die(_("object '%s' not found in type bitmaps"), oid_to_hex(&obj->oid)); if (bitmaps_nr > 1) die(_("object '%s' does not have a unique type"), oid_to_hex(&obj->oid)); if (bitmap_type != obj->type) die(_("object '%s': real type '%s', expected: '%s'"), oid_to_hex(&obj->oid), type_name(obj->type), type_name(bitmap_type)); } static void test_show_object(struct object *object, const char *name UNUSED, void *data) { struct bitmap_test_data *tdata = data; int bitmap_pos; bitmap_pos = bitmap_position(tdata->bitmap_git, &object->oid); if (bitmap_pos < 0) die(_("object not in bitmap: '%s'"), oid_to_hex(&object->oid)); test_bitmap_type(tdata, object, bitmap_pos); bitmap_set(tdata->base, bitmap_pos); display_progress(tdata->prg, ++tdata->seen); } static void test_show_commit(struct commit *commit, void *data) { struct bitmap_test_data *tdata = data; int bitmap_pos; bitmap_pos = bitmap_position(tdata->bitmap_git, &commit->object.oid); if (bitmap_pos < 0) die(_("object not in bitmap: '%s'"), oid_to_hex(&commit->object.oid)); test_bitmap_type(tdata, &commit->object, bitmap_pos); bitmap_set(tdata->base, bitmap_pos); display_progress(tdata->prg, ++tdata->seen); } void test_bitmap_walk(struct rev_info *revs) { struct object *root; struct bitmap *result = NULL; size_t result_popcnt; struct bitmap_test_data tdata; struct bitmap_index *bitmap_git; struct ewah_bitmap *bm; if (!(bitmap_git = prepare_bitmap_git(revs->repo))) die(_("failed to load bitmap indexes")); if (revs->pending.nr != 1) die(_("you must specify exactly one commit to test")); fprintf_ln(stderr, "Bitmap v%d test (%d entries%s)", bitmap_git->version, bitmap_git->entry_count, bitmap_git->table_lookup ? "" : " loaded"); root = revs->pending.objects[0].item; bm = bitmap_for_commit(bitmap_git, (struct commit *)root); if (bm) { fprintf_ln(stderr, "Found bitmap for '%s'. %d bits / %08x checksum", oid_to_hex(&root->oid), (int)bm->bit_size, ewah_checksum(bm)); result = ewah_to_bitmap(bm); } if (!result) die(_("commit '%s' doesn't have an indexed bitmap"), oid_to_hex(&root->oid)); revs->tag_objects = 1; revs->tree_objects = 1; revs->blob_objects = 1; result_popcnt = bitmap_popcount(result); if (prepare_revision_walk(revs)) die(_("revision walk setup failed")); tdata.bitmap_git = bitmap_git; tdata.base = bitmap_new(); tdata.commits = ewah_to_bitmap(bitmap_git->commits); tdata.trees = ewah_to_bitmap(bitmap_git->trees); tdata.blobs = ewah_to_bitmap(bitmap_git->blobs); tdata.tags = ewah_to_bitmap(bitmap_git->tags); tdata.prg = start_progress("Verifying bitmap entries", result_popcnt); tdata.seen = 0; traverse_commit_list(revs, &test_show_commit, &test_show_object, &tdata); stop_progress(&tdata.prg); if (bitmap_equals(result, tdata.base)) fprintf_ln(stderr, "OK!"); else die(_("mismatch in bitmap results")); bitmap_free(result); bitmap_free(tdata.base); bitmap_free(tdata.commits); bitmap_free(tdata.trees); bitmap_free(tdata.blobs); bitmap_free(tdata.tags); free_bitmap_index(bitmap_git); } int test_bitmap_commits(struct repository *r) { struct object_id oid; MAYBE_UNUSED void *value; struct bitmap_index *bitmap_git = prepare_bitmap_git(r); if (!bitmap_git) die(_("failed to load bitmap indexes")); /* * As this function is only used to print bitmap selected * commits, we don't have to read the commit table. */ if (bitmap_git->table_lookup) { if (load_bitmap_entries_v1(bitmap_git) < 0) die(_("failed to load bitmap indexes")); } kh_foreach(bitmap_git->bitmaps, oid, value, { printf_ln("%s", oid_to_hex(&oid)); }); free_bitmap_index(bitmap_git); return 0; } int test_bitmap_hashes(struct repository *r) { struct bitmap_index *bitmap_git = prepare_bitmap_git(r); struct object_id oid; uint32_t i, index_pos; if (!bitmap_git || !bitmap_git->hashes) goto cleanup; for (i = 0; i < bitmap_num_objects(bitmap_git); i++) { if (bitmap_is_midx(bitmap_git)) index_pos = pack_pos_to_midx(bitmap_git->midx, i); else index_pos = pack_pos_to_index(bitmap_git->pack, i); nth_bitmap_object_oid(bitmap_git, &oid, index_pos); printf_ln("%s %"PRIu32"", oid_to_hex(&oid), get_be32(bitmap_git->hashes + index_pos)); } cleanup: free_bitmap_index(bitmap_git); return 0; } static void bit_pos_to_object_id(struct bitmap_index *bitmap_git, uint32_t bit_pos, struct object_id *oid) { uint32_t index_pos; if (bitmap_is_midx(bitmap_git)) index_pos = pack_pos_to_midx(bitmap_git->midx, bit_pos); else index_pos = pack_pos_to_index(bitmap_git->pack, bit_pos); nth_bitmap_object_oid(bitmap_git, oid, index_pos); } int test_bitmap_pseudo_merges(struct repository *r) { struct bitmap_index *bitmap_git; uint32_t i; bitmap_git = prepare_bitmap_git(r); if (!bitmap_git || !bitmap_git->pseudo_merges.nr) goto cleanup; for (i = 0; i < bitmap_git->pseudo_merges.nr; i++) { struct pseudo_merge *merge; struct ewah_bitmap *commits_bitmap, *merge_bitmap; merge = use_pseudo_merge(&bitmap_git->pseudo_merges, &bitmap_git->pseudo_merges.v[i]); commits_bitmap = merge->commits; merge_bitmap = pseudo_merge_bitmap(&bitmap_git->pseudo_merges, merge); printf("at=%"PRIuMAX", commits=%"PRIuMAX", objects=%"PRIuMAX"\n", (uintmax_t)merge->at, (uintmax_t)ewah_bitmap_popcount(commits_bitmap), (uintmax_t)ewah_bitmap_popcount(merge_bitmap)); } cleanup: free_bitmap_index(bitmap_git); return 0; } static void dump_ewah_object_ids(struct bitmap_index *bitmap_git, struct ewah_bitmap *bitmap) { struct ewah_iterator it; eword_t word; uint32_t pos = 0; ewah_iterator_init(&it, bitmap); while (ewah_iterator_next(&word, &it)) { struct object_id oid; uint32_t offset; for (offset = 0; offset < BITS_IN_EWORD; offset++) { if (!(word >> offset)) break; offset += ewah_bit_ctz64(word >> offset); bit_pos_to_object_id(bitmap_git, pos + offset, &oid); printf("%s\n", oid_to_hex(&oid)); } pos += BITS_IN_EWORD; } } int test_bitmap_pseudo_merge_commits(struct repository *r, uint32_t n) { struct bitmap_index *bitmap_git; struct pseudo_merge *merge; int ret = 0; bitmap_git = prepare_bitmap_git(r); if (!bitmap_git || !bitmap_git->pseudo_merges.nr) goto cleanup; if (n >= bitmap_git->pseudo_merges.nr) { ret = error(_("pseudo-merge index out of range " "(%"PRIu32" >= %"PRIuMAX")"), n, (uintmax_t)bitmap_git->pseudo_merges.nr); goto cleanup; } merge = use_pseudo_merge(&bitmap_git->pseudo_merges, &bitmap_git->pseudo_merges.v[n]); dump_ewah_object_ids(bitmap_git, merge->commits); cleanup: free_bitmap_index(bitmap_git); return ret; } int test_bitmap_pseudo_merge_objects(struct repository *r, uint32_t n) { struct bitmap_index *bitmap_git; struct pseudo_merge *merge; int ret = 0; bitmap_git = prepare_bitmap_git(r); if (!bitmap_git || !bitmap_git->pseudo_merges.nr) goto cleanup; if (n >= bitmap_git->pseudo_merges.nr) { ret = error(_("pseudo-merge index out of range " "(%"PRIu32" >= %"PRIuMAX")"), n, (uintmax_t)bitmap_git->pseudo_merges.nr); goto cleanup; } merge = use_pseudo_merge(&bitmap_git->pseudo_merges, &bitmap_git->pseudo_merges.v[n]); dump_ewah_object_ids(bitmap_git, pseudo_merge_bitmap(&bitmap_git->pseudo_merges, merge)); cleanup: free_bitmap_index(bitmap_git); return ret; } int rebuild_bitmap(const uint32_t *reposition, struct ewah_bitmap *source, struct bitmap *dest) { uint32_t pos = 0; struct ewah_iterator it; eword_t word; ewah_iterator_init(&it, source); while (ewah_iterator_next(&word, &it)) { uint32_t offset, bit_pos; for (offset = 0; offset < BITS_IN_EWORD; ++offset) { if ((word >> offset) == 0) break; offset += ewah_bit_ctz64(word >> offset); bit_pos = reposition[pos + offset]; if (bit_pos > 0) bitmap_set(dest, bit_pos - 1); else /* can't reuse, we don't have the object */ return -1; } pos += BITS_IN_EWORD; } return 0; } uint32_t *create_bitmap_mapping(struct bitmap_index *bitmap_git, struct packing_data *mapping) { struct repository *r = the_repository; uint32_t i, num_objects; uint32_t *reposition; if (!bitmap_is_midx(bitmap_git)) load_reverse_index(r, bitmap_git); else if (load_midx_revindex(bitmap_git->midx)) BUG("rebuild_existing_bitmaps: missing required rev-cache " "extension"); num_objects = bitmap_num_objects(bitmap_git); CALLOC_ARRAY(reposition, num_objects); for (i = 0; i < num_objects; ++i) { struct object_id oid; struct object_entry *oe; uint32_t index_pos; if (bitmap_is_midx(bitmap_git)) index_pos = pack_pos_to_midx(bitmap_git->midx, i); else index_pos = pack_pos_to_index(bitmap_git->pack, i); nth_bitmap_object_oid(bitmap_git, &oid, index_pos); oe = packlist_find(mapping, &oid); if (oe) { reposition[i] = oe_in_pack_pos(mapping, oe) + 1; if (bitmap_git->hashes && !oe->hash) oe->hash = get_be32(bitmap_git->hashes + index_pos); } } return reposition; } void free_bitmap_index(struct bitmap_index *b) { if (!b) return; if (b->map) munmap(b->map, b->map_size); ewah_pool_free(b->commits); ewah_pool_free(b->trees); ewah_pool_free(b->blobs); ewah_pool_free(b->tags); if (b->bitmaps) { struct stored_bitmap *sb; kh_foreach_value(b->bitmaps, sb, { ewah_pool_free(sb->root); free(sb); }); } kh_destroy_oid_map(b->bitmaps); free(b->ext_index.objects); free(b->ext_index.hashes); kh_destroy_oid_pos(b->ext_index.positions); bitmap_free(b->result); bitmap_free(b->haves); if (bitmap_is_midx(b)) { /* * Multi-pack bitmaps need to have resources associated with * their on-disk reverse indexes unmapped so that stale .rev and * .bitmap files can be removed. * * Unlike pack-based bitmaps, multi-pack bitmaps can be read and * written in the same 'git multi-pack-index write --bitmap' * process. Close resources so they can be removed safely on * platforms like Windows. */ close_midx_revindex(b->midx); } free_pseudo_merge_map(&b->pseudo_merges); free(b); } int bitmap_has_oid_in_uninteresting(struct bitmap_index *bitmap_git, const struct object_id *oid) { return bitmap_git && bitmap_walk_contains(bitmap_git, bitmap_git->haves, oid); } static off_t get_disk_usage_for_type(struct bitmap_index *bitmap_git, enum object_type object_type) { struct bitmap *result = bitmap_git->result; off_t total = 0; struct ewah_iterator it; eword_t filter; size_t i; init_type_iterator(&it, bitmap_git, object_type); for (i = 0; i < result->word_alloc && ewah_iterator_next(&filter, &it); i++) { eword_t word = result->words[i] & filter; size_t base = (i * BITS_IN_EWORD); unsigned offset; if (!word) continue; for (offset = 0; offset < BITS_IN_EWORD; offset++) { if ((word >> offset) == 0) break; offset += ewah_bit_ctz64(word >> offset); if (bitmap_is_midx(bitmap_git)) { uint32_t pack_pos; uint32_t midx_pos = pack_pos_to_midx(bitmap_git->midx, base + offset); off_t offset = nth_midxed_offset(bitmap_git->midx, midx_pos); uint32_t pack_id = nth_midxed_pack_int_id(bitmap_git->midx, midx_pos); struct packed_git *pack = bitmap_git->midx->packs[pack_id]; if (offset_to_pack_pos(pack, offset, &pack_pos) < 0) { struct object_id oid; nth_midxed_object_oid(&oid, bitmap_git->midx, midx_pos); die(_("could not find '%s' in pack '%s' at offset %"PRIuMAX), oid_to_hex(&oid), pack->pack_name, (uintmax_t)offset); } total += pack_pos_to_offset(pack, pack_pos + 1) - offset; } else { size_t pos = base + offset; total += pack_pos_to_offset(bitmap_git->pack, pos + 1) - pack_pos_to_offset(bitmap_git->pack, pos); } } } return total; } static off_t get_disk_usage_for_extended(struct bitmap_index *bitmap_git) { struct bitmap *result = bitmap_git->result; struct eindex *eindex = &bitmap_git->ext_index; off_t total = 0; struct object_info oi = OBJECT_INFO_INIT; off_t object_size; size_t i; oi.disk_sizep = &object_size; for (i = 0; i < eindex->count; i++) { struct object *obj = eindex->objects[i]; if (!bitmap_get(result, st_add(bitmap_num_objects(bitmap_git), i))) continue; if (oid_object_info_extended(the_repository, &obj->oid, &oi, 0) < 0) die(_("unable to get disk usage of '%s'"), oid_to_hex(&obj->oid)); total += object_size; } return total; } off_t get_disk_usage_from_bitmap(struct bitmap_index *bitmap_git, struct rev_info *revs) { off_t total = 0; total += get_disk_usage_for_type(bitmap_git, OBJ_COMMIT); if (revs->tree_objects) total += get_disk_usage_for_type(bitmap_git, OBJ_TREE); if (revs->blob_objects) total += get_disk_usage_for_type(bitmap_git, OBJ_BLOB); if (revs->tag_objects) total += get_disk_usage_for_type(bitmap_git, OBJ_TAG); total += get_disk_usage_for_extended(bitmap_git); return total; } int bitmap_is_midx(struct bitmap_index *bitmap_git) { return !!bitmap_git->midx; } const struct string_list *bitmap_preferred_tips(struct repository *r) { const struct string_list *dest; if (!repo_config_get_string_multi(r, "pack.preferbitmaptips", &dest)) return dest; return NULL; } int bitmap_is_preferred_refname(struct repository *r, const char *refname) { const struct string_list *preferred_tips = bitmap_preferred_tips(r); struct string_list_item *item; if (!preferred_tips) return 0; for_each_string_list_item(item, preferred_tips) { if (starts_with(refname, item->string)) return 1; } return 0; } static int verify_bitmap_file(const char *name) { struct stat st; unsigned char *data; int fd = git_open(name); int res = 0; /* It is OK to not have the file. */ if (fd < 0 || fstat(fd, &st)) { if (fd >= 0) close(fd); return 0; } data = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); close(fd); if (!hashfile_checksum_valid(data, st.st_size)) res = error(_("bitmap file '%s' has invalid checksum"), name); munmap(data, st.st_size); return res; } int verify_bitmap_files(struct repository *r) { int res = 0; for (struct multi_pack_index *m = get_multi_pack_index(r); m; m = m->next) { char *midx_bitmap_name = midx_bitmap_filename(m); res |= verify_bitmap_file(midx_bitmap_name); free(midx_bitmap_name); } for (struct packed_git *p = get_all_packs(r); p; p = p->next) { char *pack_bitmap_name = pack_bitmap_filename(p); res |= verify_bitmap_file(pack_bitmap_name); free(pack_bitmap_name); } return res; }