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pack-bitmap: avoid use of static bitmap_writer

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The pack-bitmap machinery uses a structure called 'bitmap_writer' to
collect the data necessary to write out .bitmap files. Since its
introduction in 7cc8f97108 (pack-objects: implement bitmap writing,
2013-12-21), there has been a single static bitmap_writer structure,
which is responsible for all bitmap writing-related operations.

In practice, this is OK, since we are only ever writing a single .bitmap
file in a single process (e.g., `git multi-pack-index write --bitmap`,
`git pack-objects --write-bitmap-index`, `git repack -b`, etc.).

However, having a single static variable makes issues like data
ownership unclear, when to free variables, what has/hasn't been
initialized unclear.

Refactor this code to be written in terms of a given bitmap_writer
structure instead of relying on a static global.

Note that this exposes the structure definition of the bitmap_writer at
the pack-bitmap.h level. We could work around this by, e.g., forcing
callers to declare their writers as:

    struct bitmap_writer *writer;
    bitmap_writer_init(&bitmap_writer);

and then declaring `bitmap_writer_init()` as taking in a double-pointer
like so:

    void bitmap_writer_init(struct bitmap_writer **writer);

which would avoid us having to expose the definition of the structure
itself. This patch takes a different approach, since future patches
(like for the ongoing pseudo-merge bitmaps work) will want to modify the
innards of this structure (in the previous example, via pseudo-merge.c).

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2024-05-14 15:56:56 -04:00 committed by Junio C Hamano
parent 94830fcacc
commit 07647c92ff
4 changed files with 160 additions and 124 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
builtin/pack-objects.c
View File

@ -1245,6 +1245,7 @@ static void write_pack_file(void)
uint32_t nr_remaining = nr_result;
time_t last_mtime = 0;
struct object_entry **write_order;
struct bitmap_writer bitmap_writer;
if (progress > pack_to_stdout)
progress_state = start_progress(_("Writing objects"), nr_result);
@ -1339,8 +1340,9 @@ static void write_pack_file(void)
hash_to_hex(hash));
if (write_bitmap_index) {
bitmap_writer_set_checksum(hash);
bitmap_writer_build_type_index(
bitmap_writer_init(&bitmap_writer);
bitmap_writer_set_checksum(&bitmap_writer, hash);
bitmap_writer_build_type_index(&bitmap_writer,
&to_pack, written_list, nr_written);
}
@ -1358,11 +1360,16 @@ static void write_pack_file(void)
strbuf_addstr(&tmpname, "bitmap");
stop_progress(&progress_state);
bitmap_writer_show_progress(progress);
bitmap_writer_select_commits(indexed_commits, indexed_commits_nr, -1);
if (bitmap_writer_build(&to_pack) < 0)
bitmap_writer_show_progress(&bitmap_writer,
progress);
bitmap_writer_select_commits(&bitmap_writer,
indexed_commits,
indexed_commits_nr,
-1);
if (bitmap_writer_build(&bitmap_writer, &to_pack) < 0)
die(_("failed to write bitmap index"));
bitmap_writer_finish(written_list, nr_written,
bitmap_writer_finish(&bitmap_writer,
written_list, nr_written,
tmpname.buf, write_bitmap_options);
write_bitmap_index = 0;
strbuf_setlen(&tmpname, tmpname_len);

16
midx-write.c
View File

@ -798,6 +798,7 @@ static int write_midx_bitmap(const char *midx_name,
{
int ret, i;
uint16_t options = 0;
struct bitmap_writer writer;
struct pack_idx_entry **index;
char *bitmap_name = xstrfmt("%s-%s.bitmap", midx_name,
hash_to_hex(midx_hash));
@ -819,8 +820,10 @@ static int write_midx_bitmap(const char *midx_name,
for (i = 0; i < pdata->nr_objects; i++)
index[i] = &pdata->objects[i].idx;
bitmap_writer_show_progress(flags & MIDX_PROGRESS);
bitmap_writer_build_type_index(pdata, index, pdata->nr_objects);
bitmap_writer_init(&writer);
bitmap_writer_show_progress(&writer, flags & MIDX_PROGRESS);
bitmap_writer_build_type_index(&writer, pdata, index,
pdata->nr_objects);
/*
* bitmap_writer_finish expects objects in lex order, but pack_order
@ -838,13 +841,14 @@ static int write_midx_bitmap(const char *midx_name,
for (i = 0; i < pdata->nr_objects; i++)
index[pack_order[i]] = &pdata->objects[i].idx;
bitmap_writer_select_commits(commits, commits_nr, -1);
ret = bitmap_writer_build(pdata);
bitmap_writer_select_commits(&writer, commits, commits_nr, -1);
ret = bitmap_writer_build(&writer, pdata);
if (ret < 0)
goto cleanup;
bitmap_writer_set_checksum(midx_hash);
bitmap_writer_finish(index, pdata->nr_objects, bitmap_name, options);
bitmap_writer_set_checksum(&writer, midx_hash);
bitmap_writer_finish(&writer, index, pdata->nr_objects, bitmap_name,
options);
cleanup:
free(index);

211
pack-bitmap-write.c
View File

@ -27,43 +27,30 @@ struct bitmapped_commit {
uint32_t commit_pos;
};
struct bitmap_writer {
struct ewah_bitmap *commits;
struct ewah_bitmap *trees;
struct ewah_bitmap *blobs;
struct ewah_bitmap *tags;
kh_oid_map_t *bitmaps;
struct packing_data *to_pack;
struct bitmapped_commit *selected;
unsigned int selected_nr, selected_alloc;
struct progress *progress;
int show_progress;
unsigned char pack_checksum[GIT_MAX_RAWSZ];
};
static struct bitmap_writer writer;
void bitmap_writer_show_progress(int show)
void bitmap_writer_init(struct bitmap_writer *writer)
{
writer.show_progress = show;
memset(writer, 0, sizeof(struct bitmap_writer));
}
void bitmap_writer_show_progress(struct bitmap_writer *writer, int show)
{
writer->show_progress = show;
}
/**
* Build the initial type index for the packfile or multi-pack-index
*/
void bitmap_writer_build_type_index(struct packing_data *to_pack,
void bitmap_writer_build_type_index(struct bitmap_writer *writer,
struct packing_data *to_pack,
struct pack_idx_entry **index,
uint32_t index_nr)
{
uint32_t i;
writer.commits = ewah_new();
writer.trees = ewah_new();
writer.blobs = ewah_new();
writer.tags = ewah_new();
writer->commits = ewah_new();
writer->trees = ewah_new();
writer->blobs = ewah_new();
writer->tags = ewah_new();
ALLOC_ARRAY(to_pack->in_pack_pos, to_pack->nr_objects);
for (i = 0; i < index_nr; ++i) {
@ -88,19 +75,19 @@ void bitmap_writer_build_type_index(struct packing_data *to_pack,
switch (real_type) {
case OBJ_COMMIT:
ewah_set(writer.commits, i);
ewah_set(writer->commits, i);
break;
case OBJ_TREE:
ewah_set(writer.trees, i);
ewah_set(writer->trees, i);
break;
case OBJ_BLOB:
ewah_set(writer.blobs, i);
ewah_set(writer->blobs, i);
break;
case OBJ_TAG:
ewah_set(writer.tags, i);
ewah_set(writer->tags, i);
break;
default:
@ -115,23 +102,25 @@ void bitmap_writer_build_type_index(struct packing_data *to_pack,
* Compute the actual bitmaps
*/
static inline void push_bitmapped_commit(struct commit *commit)
static inline void push_bitmapped_commit(struct bitmap_writer *writer,
struct commit *commit)
{
if (writer.selected_nr >= writer.selected_alloc) {
writer.selected_alloc = (writer.selected_alloc + 32) * 2;
REALLOC_ARRAY(writer.selected, writer.selected_alloc);
if (writer->selected_nr >= writer->selected_alloc) {
writer->selected_alloc = (writer->selected_alloc + 32) * 2;
REALLOC_ARRAY(writer->selected, writer->selected_alloc);
}
writer.selected[writer.selected_nr].commit = commit;
writer.selected[writer.selected_nr].bitmap = NULL;
writer.selected[writer.selected_nr].flags = 0;
writer->selected[writer->selected_nr].commit = commit;
writer->selected[writer->selected_nr].bitmap = NULL;
writer->selected[writer->selected_nr].flags = 0;
writer.selected_nr++;
writer->selected_nr++;
}
static uint32_t find_object_pos(const struct object_id *oid, int *found)
static uint32_t find_object_pos(struct bitmap_writer *writer,
const struct object_id *oid, int *found)
{
struct object_entry *entry = packlist_find(writer.to_pack, oid);
struct object_entry *entry = packlist_find(writer->to_pack, oid);
if (!entry) {
if (found)
@ -143,17 +132,17 @@ static uint32_t find_object_pos(const struct object_id *oid, int *found)
if (found)
*found = 1;
return oe_in_pack_pos(writer.to_pack, entry);
return oe_in_pack_pos(writer->to_pack, entry);
}
static void compute_xor_offsets(void)
static void compute_xor_offsets(struct bitmap_writer *writer)
{
static const int MAX_XOR_OFFSET_SEARCH = 10;
int i, next = 0;
while (next < writer.selected_nr) {
struct bitmapped_commit *stored = &writer.selected[next];
while (next < writer->selected_nr) {
struct bitmapped_commit *stored = &writer->selected[next];
int best_offset = 0;
struct ewah_bitmap *best_bitmap = stored->bitmap;
@ -166,7 +155,7 @@ static void compute_xor_offsets(void)
break;
test_xor = ewah_pool_new();
ewah_xor(writer.selected[curr].bitmap, stored->bitmap, test_xor);
ewah_xor(writer->selected[curr].bitmap, stored->bitmap, test_xor);
if (test_xor->buffer_size < best_bitmap->buffer_size) {
if (best_bitmap != stored->bitmap)
@ -348,7 +337,8 @@ static void bitmap_builder_clear(struct bitmap_builder *bb)
bb->commits_nr = bb->commits_alloc = 0;
}
static int fill_bitmap_tree(struct bitmap *bitmap,
static int fill_bitmap_tree(struct bitmap_writer *writer,
struct bitmap *bitmap,
struct tree *tree)
{
int found;
@ -360,7 +350,7 @@ static int fill_bitmap_tree(struct bitmap *bitmap,
* If our bit is already set, then there is nothing to do. Both this
* tree and all of its children will be set.
*/
pos = find_object_pos(&tree->object.oid, &found);
pos = find_object_pos(writer, &tree->object.oid, &found);
if (!found)
return -1;
if (bitmap_get(bitmap, pos))
@ -375,12 +365,12 @@ static int fill_bitmap_tree(struct bitmap *bitmap,
while (tree_entry(&desc, &entry)) {
switch (object_type(entry.mode)) {
case OBJ_TREE:
if (fill_bitmap_tree(bitmap,
if (fill_bitmap_tree(writer, bitmap,
lookup_tree(the_repository, &entry.oid)) < 0)
return -1;
break;
case OBJ_BLOB:
pos = find_object_pos(&entry.oid, &found);
pos = find_object_pos(writer, &entry.oid, &found);
if (!found)
return -1;
bitmap_set(bitmap, pos);
@ -397,7 +387,8 @@ static int fill_bitmap_tree(struct bitmap *bitmap,
static int reused_bitmaps_nr;
static int fill_bitmap_commit(struct bb_commit *ent,
static int fill_bitmap_commit(struct bitmap_writer *writer,
struct bb_commit *ent,
struct commit *commit,
struct prio_queue *queue,
struct prio_queue *tree_queue,
@ -436,7 +427,7 @@ static int fill_bitmap_commit(struct bb_commit *ent,
* Mark ourselves and queue our tree. The commit
* walk ensures we cover all parents.
*/
pos = find_object_pos(&c->object.oid, &found);
pos = find_object_pos(writer, &c->object.oid, &found);
if (!found)
return -1;
bitmap_set(ent->bitmap, pos);
@ -444,7 +435,8 @@ static int fill_bitmap_commit(struct bb_commit *ent,
repo_get_commit_tree(the_repository, c));
for (p = c->parents; p; p = p->next) {
pos = find_object_pos(&p->item->object.oid, &found);
pos = find_object_pos(writer, &p->item->object.oid,
&found);
if (!found)
return -1;
if (!bitmap_get(ent->bitmap, pos)) {
@ -455,29 +447,31 @@ static int fill_bitmap_commit(struct bb_commit *ent,
}
while (tree_queue->nr) {
if (fill_bitmap_tree(ent->bitmap,
if (fill_bitmap_tree(writer, ent->bitmap,
prio_queue_get(tree_queue)) < 0)
return -1;
}
return 0;
}
static void store_selected(struct bb_commit *ent, struct commit *commit)
static void store_selected(struct bitmap_writer *writer,
struct bb_commit *ent, struct commit *commit)
{
struct bitmapped_commit *stored = &writer.selected[ent->idx];
struct bitmapped_commit *stored = &writer->selected[ent->idx];
khiter_t hash_pos;
int hash_ret;
stored->bitmap = bitmap_to_ewah(ent->bitmap);
hash_pos = kh_put_oid_map(writer.bitmaps, commit->object.oid, &hash_ret);
hash_pos = kh_put_oid_map(writer->bitmaps, commit->object.oid, &hash_ret);
if (hash_ret == 0)
die("Duplicate entry when writing index: %s",
oid_to_hex(&commit->object.oid));
kh_value(writer.bitmaps, hash_pos) = stored;
kh_value(writer->bitmaps, hash_pos) = stored;
}
int bitmap_writer_build(struct packing_data *to_pack)
int bitmap_writer_build(struct bitmap_writer *writer,
struct packing_data *to_pack)
{
struct bitmap_builder bb;
size_t i;
@ -488,11 +482,12 @@ int bitmap_writer_build(struct packing_data *to_pack)
uint32_t *mapping;
int closed = 1; /* until proven otherwise */
writer.bitmaps = kh_init_oid_map();
writer.to_pack = to_pack;
writer->bitmaps = kh_init_oid_map();
writer->to_pack = to_pack;
if (writer.show_progress)
writer.progress = start_progress("Building bitmaps", writer.selected_nr);
if (writer->show_progress)
writer->progress = start_progress("Building bitmaps",
writer->selected_nr);
trace2_region_enter("pack-bitmap-write", "building_bitmaps_total",
the_repository);
@ -502,23 +497,23 @@ int bitmap_writer_build(struct packing_data *to_pack)
else
mapping = NULL;
bitmap_builder_init(&bb, &writer, old_bitmap);
bitmap_builder_init(&bb, writer, old_bitmap);
for (i = bb.commits_nr; i > 0; i--) {
struct commit *commit = bb.commits[i-1];
struct bb_commit *ent = bb_data_at(&bb.data, commit);
struct commit *child;
int reused = 0;
if (fill_bitmap_commit(ent, commit, &queue, &tree_queue,
if (fill_bitmap_commit(writer, ent, commit, &queue, &tree_queue,
old_bitmap, mapping) < 0) {
closed = 0;
break;
}
if (ent->selected) {
store_selected(ent, commit);
store_selected(writer, ent, commit);
nr_stored++;
display_progress(writer.progress, nr_stored);
display_progress(writer->progress, nr_stored);
}
while ((child = pop_commit(&ent->reverse_edges))) {
@ -549,10 +544,10 @@ int bitmap_writer_build(struct packing_data *to_pack)
trace2_data_intmax("pack-bitmap-write", the_repository,
"building_bitmaps_reused", reused_bitmaps_nr);
stop_progress(&writer.progress);
stop_progress(&writer->progress);
if (closed)
compute_xor_offsets();
compute_xor_offsets(writer);
return closed ? 0 : -1;
}
@ -590,7 +585,8 @@ static int date_compare(const void *_a, const void *_b)
return (long)b->date - (long)a->date;
}
void bitmap_writer_select_commits(struct commit **indexed_commits,
void bitmap_writer_select_commits(struct bitmap_writer *writer,
struct commit **indexed_commits,
unsigned int indexed_commits_nr,
int max_bitmaps)
{
@ -600,12 +596,12 @@ void bitmap_writer_select_commits(struct commit **indexed_commits,
if (indexed_commits_nr < 100) {
for (i = 0; i < indexed_commits_nr; ++i)
push_bitmapped_commit(indexed_commits[i]);
push_bitmapped_commit(writer, indexed_commits[i]);
return;
}
if (writer.show_progress)
writer.progress = start_progress("Selecting bitmap commits", 0);
if (writer->show_progress)
writer->progress = start_progress("Selecting bitmap commits", 0);
for (;;) {
struct commit *chosen = NULL;
@ -615,8 +611,8 @@ void bitmap_writer_select_commits(struct commit **indexed_commits,
if (i + next >= indexed_commits_nr)
break;
if (max_bitmaps > 0 && writer.selected_nr >= max_bitmaps) {
writer.selected_nr = max_bitmaps;
if (max_bitmaps > 0 && writer->selected_nr >= max_bitmaps) {
writer->selected_nr = max_bitmaps;
break;
}
@ -638,13 +634,13 @@ void bitmap_writer_select_commits(struct commit **indexed_commits,
}
}
push_bitmapped_commit(chosen);
push_bitmapped_commit(writer, chosen);
i += next + 1;
display_progress(writer.progress, i);
display_progress(writer->progress, i);
}
stop_progress(&writer.progress);
stop_progress(&writer->progress);
}
@ -670,12 +666,13 @@ static const struct object_id *oid_access(size_t pos, const void *table)
return &index[pos]->oid;
}
static void write_selected_commits_v1(struct hashfile *f, off_t *offsets)
static void write_selected_commits_v1(struct bitmap_writer *writer,
struct hashfile *f, off_t *offsets)
{
int i;
for (i = 0; i < writer.selected_nr; ++i) {
struct bitmapped_commit *stored = &writer.selected[i];
for (i = 0; i < writer->selected_nr; ++i) {
struct bitmapped_commit *stored = &writer->selected[i];
if (offsets)
offsets[i] = hashfile_total(f);
@ -688,10 +685,11 @@ static void write_selected_commits_v1(struct hashfile *f, off_t *offsets)
}
}
static int table_cmp(const void *_va, const void *_vb)
static int table_cmp(const void *_va, const void *_vb, void *_data)
{
struct bitmapped_commit *a = &writer.selected[*(uint32_t *)_va];
struct bitmapped_commit *b = &writer.selected[*(uint32_t *)_vb];
struct bitmap_writer *writer = _data;
struct bitmapped_commit *a = &writer->selected[*(uint32_t *)_va];
struct bitmapped_commit *b = &writer->selected[*(uint32_t *)_vb];
if (a->commit_pos < b->commit_pos)
return -1;
@ -701,15 +699,16 @@ static int table_cmp(const void *_va, const void *_vb)
return 0;
}
static void write_lookup_table(struct hashfile *f, off_t *offsets)
static void write_lookup_table(struct bitmap_writer *writer, struct hashfile *f,
off_t *offsets)
{
uint32_t i;
uint32_t *table, *table_inv;
ALLOC_ARRAY(table, writer.selected_nr);
ALLOC_ARRAY(table_inv, writer.selected_nr);
ALLOC_ARRAY(table, writer->selected_nr);
ALLOC_ARRAY(table_inv, writer->selected_nr);
for (i = 0; i < writer.selected_nr; i++)
for (i = 0; i < writer->selected_nr; i++)
table[i] = i;
/*
@ -717,17 +716,17 @@ static void write_lookup_table(struct hashfile *f, off_t *offsets)
* bitmap corresponds to j'th bitmapped commit (among the selected
* commits) in lex order of OIDs.
*/
QSORT(table, writer.selected_nr, table_cmp);
QSORT_S(table, writer->selected_nr, table_cmp, writer);
/* table_inv helps us discover that relationship (i'th bitmap
* to j'th commit by j = table_inv[i])
*/
for (i = 0; i < writer.selected_nr; i++)
for (i = 0; i < writer->selected_nr; i++)
table_inv[table[i]] = i;
trace2_region_enter("pack-bitmap-write", "writing_lookup_table", the_repository);
for (i = 0; i < writer.selected_nr; i++) {
struct bitmapped_commit *selected = &writer.selected[table[i]];
for (i = 0; i < writer->selected_nr; i++) {
struct bitmapped_commit *selected = &writer->selected[table[i]];
uint32_t xor_offset = selected->xor_offset;
uint32_t xor_row;
@ -748,7 +747,7 @@ static void write_lookup_table(struct hashfile *f, off_t *offsets)
xor_row = 0xffffffff;
}
hashwrite_be32(f, writer.selected[table[i]].commit_pos);
hashwrite_be32(f, writer->selected[table[i]].commit_pos);
hashwrite_be64(f, (uint64_t)offsets[table[i]]);
hashwrite_be32(f, xor_row);
}
@ -770,12 +769,14 @@ static void write_hash_cache(struct hashfile *f,
}
}
void bitmap_writer_set_checksum(const unsigned char *sha1)
void bitmap_writer_set_checksum(struct bitmap_writer *writer,
const unsigned char *sha1)
{
hashcpy(writer.pack_checksum, sha1);
hashcpy(writer->pack_checksum, sha1);
}
void bitmap_writer_finish(struct pack_idx_entry **index,
void bitmap_writer_finish(struct bitmap_writer *writer,
struct pack_idx_entry **index,
uint32_t index_nr,
const char *filename,
uint16_t options)
@ -796,20 +797,20 @@ void bitmap_writer_finish(struct pack_idx_entry **index,
memcpy(header.magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE));
header.version = htons(default_version);
header.options = htons(flags | options);
header.entry_count = htonl(writer.selected_nr);
hashcpy(header.checksum, writer.pack_checksum);
header.entry_count = htonl(writer->selected_nr);
hashcpy(header.checksum, writer->pack_checksum);
hashwrite(f, &header, sizeof(header) - GIT_MAX_RAWSZ + the_hash_algo->rawsz);
dump_bitmap(f, writer.commits);
dump_bitmap(f, writer.trees);
dump_bitmap(f, writer.blobs);
dump_bitmap(f, writer.tags);
dump_bitmap(f, writer->commits);
dump_bitmap(f, writer->trees);
dump_bitmap(f, writer->blobs);
dump_bitmap(f, writer->tags);
if (options & BITMAP_OPT_LOOKUP_TABLE)
CALLOC_ARRAY(offsets, index_nr);
for (i = 0; i < writer.selected_nr; i++) {
struct bitmapped_commit *stored = &writer.selected[i];
for (i = 0; i < writer->selected_nr; i++) {
struct bitmapped_commit *stored = &writer->selected[i];
int commit_pos = oid_pos(&stored->commit->object.oid, index,
index_nr, oid_access);
@ -818,10 +819,10 @@ void bitmap_writer_finish(struct pack_idx_entry **index,
stored->commit_pos = commit_pos;
}
write_selected_commits_v1(f, offsets);
write_selected_commits_v1(writer, f, offsets);
if (options & BITMAP_OPT_LOOKUP_TABLE)
write_lookup_table(f, offsets);
write_lookup_table(writer, f, offsets);
if (options & BITMAP_OPT_HASH_CACHE)
write_hash_cache(f, index, index_nr);

38
pack-bitmap.h
View File

@ -97,9 +97,29 @@ int bitmap_has_oid_in_uninteresting(struct bitmap_index *, const struct object_i
off_t get_disk_usage_from_bitmap(struct bitmap_index *, struct rev_info *);
void bitmap_writer_show_progress(int show);
void bitmap_writer_set_checksum(const unsigned char *sha1);
void bitmap_writer_build_type_index(struct packing_data *to_pack,
struct bitmap_writer {
struct ewah_bitmap *commits;
struct ewah_bitmap *trees;
struct ewah_bitmap *blobs;
struct ewah_bitmap *tags;
kh_oid_map_t *bitmaps;
struct packing_data *to_pack;
struct bitmapped_commit *selected;
unsigned int selected_nr, selected_alloc;
struct progress *progress;
int show_progress;
unsigned char pack_checksum[GIT_MAX_RAWSZ];
};
void bitmap_writer_init(struct bitmap_writer *writer);
void bitmap_writer_show_progress(struct bitmap_writer *writer, int show);
void bitmap_writer_set_checksum(struct bitmap_writer *writer,
const unsigned char *sha1);
void bitmap_writer_build_type_index(struct bitmap_writer *writer,
struct packing_data *to_pack,
struct pack_idx_entry **index,
uint32_t index_nr);
uint32_t *create_bitmap_mapping(struct bitmap_index *bitmap_git,
@ -109,10 +129,14 @@ int rebuild_bitmap(const uint32_t *reposition,
struct bitmap *dest);
struct ewah_bitmap *bitmap_for_commit(struct bitmap_index *bitmap_git,
struct commit *commit);
void bitmap_writer_select_commits(struct commit **indexed_commits,
unsigned int indexed_commits_nr, int max_bitmaps);
int bitmap_writer_build(struct packing_data *to_pack);
void bitmap_writer_finish(struct pack_idx_entry **index,
void bitmap_writer_select_commits(struct bitmap_writer *writer,
struct commit **indexed_commits,
unsigned int indexed_commits_nr,
int max_bitmaps);
int bitmap_writer_build(struct bitmap_writer *writer,
struct packing_data *to_pack);
void bitmap_writer_finish(struct bitmap_writer *writer,
struct pack_idx_entry **index,
uint32_t index_nr,
const char *filename,
uint16_t options);