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bloom: annotate filters with hash version

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In subsequent commits, we will want to load existing Bloom filters out
of a commit-graph, even when the hash version they were computed with
does not match the value of `commitGraph.changedPathVersion`.

In order to differentiate between the two, add a "version" field to each
Bloom filter.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2024-06-25 13:39:54 -04:00 committed by Junio C Hamano
parent ea0024deb9
commit 5b5d5b598c
2 changed files with 9 additions and 3 deletions
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11
bloom.c
View file

@ -88,6 +88,7 @@ int load_bloom_filter_from_graph(struct commit_graph *g,
filter->data = (unsigned char *)(g->chunk_bloom_data +
sizeof(unsigned char) * start_index +
BLOOMDATA_CHUNK_HEADER_SIZE);
filter->version = g->bloom_filter_settings->hash_version;
return 1;
}
@ -210,11 +211,13 @@ static int pathmap_cmp(const void *hashmap_cmp_fn_data UNUSED,
return strcmp(e1->path, e2->path);
}
static void init_truncated_large_filter(struct bloom_filter *filter)
static void init_truncated_large_filter(struct bloom_filter *filter,
int version)
{
filter->data = xmalloc(1);
filter->data[0] = 0xFF;
filter->len = 1;
filter->version = version;
}
struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
@ -299,13 +302,15 @@ struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
}
if (hashmap_get_size(&pathmap) > settings->max_changed_paths) {
init_truncated_large_filter(filter);
init_truncated_large_filter(filter,
settings->hash_version);
if (computed)
*computed |= BLOOM_TRUNC_LARGE;
goto cleanup;
}
filter->len = (hashmap_get_size(&pathmap) * settings->bits_per_entry + BITS_PER_WORD - 1) / BITS_PER_WORD;
filter->version = settings->hash_version;
if (!filter->len) {
if (computed)
*computed |= BLOOM_TRUNC_EMPTY;
@ -325,7 +330,7 @@ struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
} else {
for (i = 0; i < diff_queued_diff.nr; i++)
diff_free_filepair(diff_queued_diff.queue[i]);
init_truncated_large_filter(filter);
init_truncated_large_filter(filter, settings->hash_version);
if (computed)
*computed |= BLOOM_TRUNC_LARGE;

1
bloom.h
View file

@ -53,6 +53,7 @@ struct bloom_filter_settings {
struct bloom_filter {
unsigned char *data;
size_t len;
int version;
};
/*