mirror of
https://github.com/git/git.git
synced 2024-10-31 06:17:56 +01:00
0dd4924891
Replace the uses of sha1_to_hex in the pack bitmap code with hash_to_hex to allow the use of SHA-256 as well. Rename a few variables since they are no longer limited to SHA-1. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
557 lines
13 KiB
C
557 lines
13 KiB
C
#include "cache.h"
|
|
#include "object-store.h"
|
|
#include "commit.h"
|
|
#include "tag.h"
|
|
#include "diff.h"
|
|
#include "revision.h"
|
|
#include "list-objects.h"
|
|
#include "progress.h"
|
|
#include "pack-revindex.h"
|
|
#include "pack.h"
|
|
#include "pack-bitmap.h"
|
|
#include "sha1-lookup.h"
|
|
#include "pack-objects.h"
|
|
#include "commit-reach.h"
|
|
|
|
struct bitmapped_commit {
|
|
struct commit *commit;
|
|
struct ewah_bitmap *bitmap;
|
|
struct ewah_bitmap *write_as;
|
|
int flags;
|
|
int xor_offset;
|
|
uint32_t commit_pos;
|
|
};
|
|
|
|
struct bitmap_writer {
|
|
struct ewah_bitmap *commits;
|
|
struct ewah_bitmap *trees;
|
|
struct ewah_bitmap *blobs;
|
|
struct ewah_bitmap *tags;
|
|
|
|
khash_sha1 *bitmaps;
|
|
khash_sha1 *reused;
|
|
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)
|
|
{
|
|
writer.show_progress = show;
|
|
}
|
|
|
|
/**
|
|
* Build the initial type index for the packfile
|
|
*/
|
|
void bitmap_writer_build_type_index(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();
|
|
ALLOC_ARRAY(to_pack->in_pack_pos, to_pack->nr_objects);
|
|
|
|
for (i = 0; i < index_nr; ++i) {
|
|
struct object_entry *entry = (struct object_entry *)index[i];
|
|
enum object_type real_type;
|
|
|
|
oe_set_in_pack_pos(to_pack, entry, i);
|
|
|
|
switch (oe_type(entry)) {
|
|
case OBJ_COMMIT:
|
|
case OBJ_TREE:
|
|
case OBJ_BLOB:
|
|
case OBJ_TAG:
|
|
real_type = oe_type(entry);
|
|
break;
|
|
|
|
default:
|
|
real_type = oid_object_info(to_pack->repo,
|
|
&entry->idx.oid, NULL);
|
|
break;
|
|
}
|
|
|
|
switch (real_type) {
|
|
case OBJ_COMMIT:
|
|
ewah_set(writer.commits, i);
|
|
break;
|
|
|
|
case OBJ_TREE:
|
|
ewah_set(writer.trees, i);
|
|
break;
|
|
|
|
case OBJ_BLOB:
|
|
ewah_set(writer.blobs, i);
|
|
break;
|
|
|
|
case OBJ_TAG:
|
|
ewah_set(writer.tags, i);
|
|
break;
|
|
|
|
default:
|
|
die("Missing type information for %s (%d/%d)",
|
|
oid_to_hex(&entry->idx.oid), real_type,
|
|
oe_type(entry));
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Compute the actual bitmaps
|
|
*/
|
|
static struct object **seen_objects;
|
|
static unsigned int seen_objects_nr, seen_objects_alloc;
|
|
|
|
static inline void push_bitmapped_commit(struct commit *commit, struct ewah_bitmap *reused)
|
|
{
|
|
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 = reused;
|
|
writer.selected[writer.selected_nr].flags = 0;
|
|
|
|
writer.selected_nr++;
|
|
}
|
|
|
|
static inline void mark_as_seen(struct object *object)
|
|
{
|
|
ALLOC_GROW(seen_objects, seen_objects_nr + 1, seen_objects_alloc);
|
|
seen_objects[seen_objects_nr++] = object;
|
|
}
|
|
|
|
static inline void reset_all_seen(void)
|
|
{
|
|
unsigned int i;
|
|
for (i = 0; i < seen_objects_nr; ++i) {
|
|
seen_objects[i]->flags &= ~(SEEN | ADDED | SHOWN);
|
|
}
|
|
seen_objects_nr = 0;
|
|
}
|
|
|
|
static uint32_t find_object_pos(const unsigned char *hash)
|
|
{
|
|
struct object_entry *entry = packlist_find(writer.to_pack, hash, NULL);
|
|
|
|
if (!entry) {
|
|
die("Failed to write bitmap index. Packfile doesn't have full closure "
|
|
"(object %s is missing)", hash_to_hex(hash));
|
|
}
|
|
|
|
return oe_in_pack_pos(writer.to_pack, entry);
|
|
}
|
|
|
|
static void show_object(struct object *object, const char *name, void *data)
|
|
{
|
|
struct bitmap *base = data;
|
|
bitmap_set(base, find_object_pos(object->oid.hash));
|
|
mark_as_seen(object);
|
|
}
|
|
|
|
static void show_commit(struct commit *commit, void *data)
|
|
{
|
|
mark_as_seen((struct object *)commit);
|
|
}
|
|
|
|
static int
|
|
add_to_include_set(struct bitmap *base, struct commit *commit)
|
|
{
|
|
khiter_t hash_pos;
|
|
uint32_t bitmap_pos = find_object_pos(commit->object.oid.hash);
|
|
|
|
if (bitmap_get(base, bitmap_pos))
|
|
return 0;
|
|
|
|
hash_pos = kh_get_sha1(writer.bitmaps, commit->object.oid.hash);
|
|
if (hash_pos < kh_end(writer.bitmaps)) {
|
|
struct bitmapped_commit *bc = kh_value(writer.bitmaps, hash_pos);
|
|
bitmap_or_ewah(base, bc->bitmap);
|
|
return 0;
|
|
}
|
|
|
|
bitmap_set(base, bitmap_pos);
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
should_include(struct commit *commit, void *_data)
|
|
{
|
|
struct bitmap *base = _data;
|
|
|
|
if (!add_to_include_set(base, commit)) {
|
|
struct commit_list *parent = commit->parents;
|
|
|
|
mark_as_seen((struct object *)commit);
|
|
|
|
while (parent) {
|
|
parent->item->object.flags |= SEEN;
|
|
mark_as_seen((struct object *)parent->item);
|
|
parent = parent->next;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void compute_xor_offsets(void)
|
|
{
|
|
static const int MAX_XOR_OFFSET_SEARCH = 10;
|
|
|
|
int i, next = 0;
|
|
|
|
while (next < writer.selected_nr) {
|
|
struct bitmapped_commit *stored = &writer.selected[next];
|
|
|
|
int best_offset = 0;
|
|
struct ewah_bitmap *best_bitmap = stored->bitmap;
|
|
struct ewah_bitmap *test_xor;
|
|
|
|
for (i = 1; i <= MAX_XOR_OFFSET_SEARCH; ++i) {
|
|
int curr = next - i;
|
|
|
|
if (curr < 0)
|
|
break;
|
|
|
|
test_xor = ewah_pool_new();
|
|
ewah_xor(writer.selected[curr].bitmap, stored->bitmap, test_xor);
|
|
|
|
if (test_xor->buffer_size < best_bitmap->buffer_size) {
|
|
if (best_bitmap != stored->bitmap)
|
|
ewah_pool_free(best_bitmap);
|
|
|
|
best_bitmap = test_xor;
|
|
best_offset = i;
|
|
} else {
|
|
ewah_pool_free(test_xor);
|
|
}
|
|
}
|
|
|
|
stored->xor_offset = best_offset;
|
|
stored->write_as = best_bitmap;
|
|
|
|
next++;
|
|
}
|
|
}
|
|
|
|
void bitmap_writer_build(struct packing_data *to_pack)
|
|
{
|
|
static const double REUSE_BITMAP_THRESHOLD = 0.2;
|
|
|
|
int i, reuse_after, need_reset;
|
|
struct bitmap *base = bitmap_new();
|
|
struct rev_info revs;
|
|
|
|
writer.bitmaps = kh_init_sha1();
|
|
writer.to_pack = to_pack;
|
|
|
|
if (writer.show_progress)
|
|
writer.progress = start_progress("Building bitmaps", writer.selected_nr);
|
|
|
|
repo_init_revisions(to_pack->repo, &revs, NULL);
|
|
revs.tag_objects = 1;
|
|
revs.tree_objects = 1;
|
|
revs.blob_objects = 1;
|
|
revs.no_walk = 0;
|
|
|
|
revs.include_check = should_include;
|
|
reset_revision_walk();
|
|
|
|
reuse_after = writer.selected_nr * REUSE_BITMAP_THRESHOLD;
|
|
need_reset = 0;
|
|
|
|
for (i = writer.selected_nr - 1; i >= 0; --i) {
|
|
struct bitmapped_commit *stored;
|
|
struct object *object;
|
|
|
|
khiter_t hash_pos;
|
|
int hash_ret;
|
|
|
|
stored = &writer.selected[i];
|
|
object = (struct object *)stored->commit;
|
|
|
|
if (stored->bitmap == NULL) {
|
|
if (i < writer.selected_nr - 1 &&
|
|
(need_reset ||
|
|
!in_merge_bases(writer.selected[i + 1].commit,
|
|
stored->commit))) {
|
|
bitmap_reset(base);
|
|
reset_all_seen();
|
|
}
|
|
|
|
add_pending_object(&revs, object, "");
|
|
revs.include_check_data = base;
|
|
|
|
if (prepare_revision_walk(&revs))
|
|
die("revision walk setup failed");
|
|
|
|
traverse_commit_list(&revs, show_commit, show_object, base);
|
|
|
|
object_array_clear(&revs.pending);
|
|
|
|
stored->bitmap = bitmap_to_ewah(base);
|
|
need_reset = 0;
|
|
} else
|
|
need_reset = 1;
|
|
|
|
if (i >= reuse_after)
|
|
stored->flags |= BITMAP_FLAG_REUSE;
|
|
|
|
hash_pos = kh_put_sha1(writer.bitmaps, object->oid.hash, &hash_ret);
|
|
if (hash_ret == 0)
|
|
die("Duplicate entry when writing index: %s",
|
|
oid_to_hex(&object->oid));
|
|
|
|
kh_value(writer.bitmaps, hash_pos) = stored;
|
|
display_progress(writer.progress, writer.selected_nr - i);
|
|
}
|
|
|
|
bitmap_free(base);
|
|
stop_progress(&writer.progress);
|
|
|
|
compute_xor_offsets();
|
|
}
|
|
|
|
/**
|
|
* Select the commits that will be bitmapped
|
|
*/
|
|
static inline unsigned int next_commit_index(unsigned int idx)
|
|
{
|
|
static const unsigned int MIN_COMMITS = 100;
|
|
static const unsigned int MAX_COMMITS = 5000;
|
|
|
|
static const unsigned int MUST_REGION = 100;
|
|
static const unsigned int MIN_REGION = 20000;
|
|
|
|
unsigned int offset, next;
|
|
|
|
if (idx <= MUST_REGION)
|
|
return 0;
|
|
|
|
if (idx <= MIN_REGION) {
|
|
offset = idx - MUST_REGION;
|
|
return (offset < MIN_COMMITS) ? offset : MIN_COMMITS;
|
|
}
|
|
|
|
offset = idx - MIN_REGION;
|
|
next = (offset < MAX_COMMITS) ? offset : MAX_COMMITS;
|
|
|
|
return (next > MIN_COMMITS) ? next : MIN_COMMITS;
|
|
}
|
|
|
|
static int date_compare(const void *_a, const void *_b)
|
|
{
|
|
struct commit *a = *(struct commit **)_a;
|
|
struct commit *b = *(struct commit **)_b;
|
|
return (long)b->date - (long)a->date;
|
|
}
|
|
|
|
void bitmap_writer_reuse_bitmaps(struct packing_data *to_pack)
|
|
{
|
|
struct bitmap_index *bitmap_git;
|
|
if (!(bitmap_git = prepare_bitmap_git(to_pack->repo)))
|
|
return;
|
|
|
|
writer.reused = kh_init_sha1();
|
|
rebuild_existing_bitmaps(bitmap_git, to_pack, writer.reused,
|
|
writer.show_progress);
|
|
/*
|
|
* NEEDSWORK: rebuild_existing_bitmaps() makes writer.reused reference
|
|
* some bitmaps in bitmap_git, so we can't free the latter.
|
|
*/
|
|
}
|
|
|
|
static struct ewah_bitmap *find_reused_bitmap(const unsigned char *sha1)
|
|
{
|
|
khiter_t hash_pos;
|
|
|
|
if (!writer.reused)
|
|
return NULL;
|
|
|
|
hash_pos = kh_get_sha1(writer.reused, sha1);
|
|
if (hash_pos >= kh_end(writer.reused))
|
|
return NULL;
|
|
|
|
return kh_value(writer.reused, hash_pos);
|
|
}
|
|
|
|
void bitmap_writer_select_commits(struct commit **indexed_commits,
|
|
unsigned int indexed_commits_nr,
|
|
int max_bitmaps)
|
|
{
|
|
unsigned int i = 0, j, next;
|
|
|
|
QSORT(indexed_commits, indexed_commits_nr, date_compare);
|
|
|
|
if (writer.show_progress)
|
|
writer.progress = start_progress("Selecting bitmap commits", 0);
|
|
|
|
if (indexed_commits_nr < 100) {
|
|
for (i = 0; i < indexed_commits_nr; ++i)
|
|
push_bitmapped_commit(indexed_commits[i], NULL);
|
|
return;
|
|
}
|
|
|
|
for (;;) {
|
|
struct ewah_bitmap *reused_bitmap = NULL;
|
|
struct commit *chosen = NULL;
|
|
|
|
next = next_commit_index(i);
|
|
|
|
if (i + next >= indexed_commits_nr)
|
|
break;
|
|
|
|
if (max_bitmaps > 0 && writer.selected_nr >= max_bitmaps) {
|
|
writer.selected_nr = max_bitmaps;
|
|
break;
|
|
}
|
|
|
|
if (next == 0) {
|
|
chosen = indexed_commits[i];
|
|
reused_bitmap = find_reused_bitmap(chosen->object.oid.hash);
|
|
} else {
|
|
chosen = indexed_commits[i + next];
|
|
|
|
for (j = 0; j <= next; ++j) {
|
|
struct commit *cm = indexed_commits[i + j];
|
|
|
|
reused_bitmap = find_reused_bitmap(cm->object.oid.hash);
|
|
if (reused_bitmap || (cm->object.flags & NEEDS_BITMAP) != 0) {
|
|
chosen = cm;
|
|
break;
|
|
}
|
|
|
|
if (cm->parents && cm->parents->next)
|
|
chosen = cm;
|
|
}
|
|
}
|
|
|
|
push_bitmapped_commit(chosen, reused_bitmap);
|
|
|
|
i += next + 1;
|
|
display_progress(writer.progress, i);
|
|
}
|
|
|
|
stop_progress(&writer.progress);
|
|
}
|
|
|
|
|
|
static int hashwrite_ewah_helper(void *f, const void *buf, size_t len)
|
|
{
|
|
/* hashwrite will die on error */
|
|
hashwrite(f, buf, len);
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* Write the bitmap index to disk
|
|
*/
|
|
static inline void dump_bitmap(struct hashfile *f, struct ewah_bitmap *bitmap)
|
|
{
|
|
if (ewah_serialize_to(bitmap, hashwrite_ewah_helper, f) < 0)
|
|
die("Failed to write bitmap index");
|
|
}
|
|
|
|
static const unsigned char *sha1_access(size_t pos, void *table)
|
|
{
|
|
struct pack_idx_entry **index = table;
|
|
return index[pos]->oid.hash;
|
|
}
|
|
|
|
static void write_selected_commits_v1(struct hashfile *f,
|
|
struct pack_idx_entry **index,
|
|
uint32_t index_nr)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < writer.selected_nr; ++i) {
|
|
struct bitmapped_commit *stored = &writer.selected[i];
|
|
|
|
int commit_pos =
|
|
sha1_pos(stored->commit->object.oid.hash, index, index_nr, sha1_access);
|
|
|
|
if (commit_pos < 0)
|
|
BUG("trying to write commit not in index");
|
|
|
|
hashwrite_be32(f, commit_pos);
|
|
hashwrite_u8(f, stored->xor_offset);
|
|
hashwrite_u8(f, stored->flags);
|
|
|
|
dump_bitmap(f, stored->write_as);
|
|
}
|
|
}
|
|
|
|
static void write_hash_cache(struct hashfile *f,
|
|
struct pack_idx_entry **index,
|
|
uint32_t index_nr)
|
|
{
|
|
uint32_t i;
|
|
|
|
for (i = 0; i < index_nr; ++i) {
|
|
struct object_entry *entry = (struct object_entry *)index[i];
|
|
uint32_t hash_value = htonl(entry->hash);
|
|
hashwrite(f, &hash_value, sizeof(hash_value));
|
|
}
|
|
}
|
|
|
|
void bitmap_writer_set_checksum(unsigned char *sha1)
|
|
{
|
|
hashcpy(writer.pack_checksum, sha1);
|
|
}
|
|
|
|
void bitmap_writer_finish(struct pack_idx_entry **index,
|
|
uint32_t index_nr,
|
|
const char *filename,
|
|
uint16_t options)
|
|
{
|
|
static uint16_t default_version = 1;
|
|
static uint16_t flags = BITMAP_OPT_FULL_DAG;
|
|
struct strbuf tmp_file = STRBUF_INIT;
|
|
struct hashfile *f;
|
|
|
|
struct bitmap_disk_header header;
|
|
|
|
int fd = odb_mkstemp(&tmp_file, "pack/tmp_bitmap_XXXXXX");
|
|
|
|
f = hashfd(fd, tmp_file.buf);
|
|
|
|
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);
|
|
|
|
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);
|
|
write_selected_commits_v1(f, index, index_nr);
|
|
|
|
if (options & BITMAP_OPT_HASH_CACHE)
|
|
write_hash_cache(f, index, index_nr);
|
|
|
|
finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE);
|
|
|
|
if (adjust_shared_perm(tmp_file.buf))
|
|
die_errno("unable to make temporary bitmap file readable");
|
|
|
|
if (rename(tmp_file.buf, filename))
|
|
die_errno("unable to rename temporary bitmap file to '%s'", filename);
|
|
|
|
strbuf_release(&tmp_file);
|
|
}
|