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midx-write.c: reduce argument count for get_sorted_entries()

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The function `midx-write.c::get_sorted_entries()` is responsible for
constructing the array of OIDs from a given list of packs which will
comprise the MIDX being written.

The singular call-site for this function looks something like:

    ctx.entries = get_sorted_entries(ctx.m, ctx.info, ctx.nr,
                                     &ctx.entries_nr,
                                     ctx.preferred_pack_idx);

This function has five formal arguments, all of which are members of the
shared `struct write_midx_context` used to track various pieces of
information about the MIDX being written.

The function `get_sorted_entries()` dates back to fe1ed56f5e (midx:
sort and deduplicate objects from packfiles, 2018-07-12), which came
shortly after 396f257018 (multi-pack-index: read packfile list,
2018-07-12). The latter patch introduced the `pack_list` structure,
which was a precursor to the structure we now know as
`write_midx_context` (c.f. 577dc49696 (midx: rename pack_info to
write_midx_context, 2021-02-18)).

At the time, `get_sorted_entries()` likely could have used the pack_list
structure introduced earlier in 396f257018, but understandably did not
since the structure only contained three fields (only two of which were
relevant to `get_sorted_entries()`) at the time.

Simplify the declaration of this function by taking a single pointer to
the whole `struct write_midx_context` instead of various members within
it. Since this function is now computing the entire result (populating
both `ctx->entries`, and `ctx->entries_nr`), rename it to something that
doesn't start with "get_" to make clear that this function has a
side-effect.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2024-05-29 18:55:23 -04:00 committed by Junio C Hamano
parent 23532be8e9
commit 3eac5e1ff1
1 changed files with 19 additions and 26 deletions
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45
midx-write.c
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@ -299,21 +299,16 @@ static void midx_fanout_add_pack_fanout(struct midx_fanout *fanout,
* Copy only the de-duplicated entries (selected by most-recent modified time
* of a packfile containing the object).
*/
static struct pack_midx_entry *get_sorted_entries(struct multi_pack_index *m,
struct pack_info *info,
uint32_t nr_packs,
size_t *nr_objects,
int preferred_pack)
static void compute_sorted_entries(struct write_midx_context *ctx)
{
uint32_t cur_fanout, cur_pack, cur_object;
size_t alloc_objects, total_objects = 0;
struct midx_fanout fanout = { 0 };
struct pack_midx_entry *deduplicated_entries = NULL;
uint32_t start_pack = m ? m->num_packs : 0;
uint32_t start_pack = ctx->m ? ctx->m->num_packs : 0;
for (cur_pack = start_pack; cur_pack < nr_packs; cur_pack++)
for (cur_pack = start_pack; cur_pack < ctx->nr; cur_pack++)
total_objects = st_add(total_objects,
info[cur_pack].p->num_objects);
ctx->info[cur_pack].p->num_objects);
/*
* As we de-duplicate by fanout value, we expect the fanout
@ -323,26 +318,26 @@ static struct pack_midx_entry *get_sorted_entries(struct multi_pack_index *m,
alloc_objects = fanout.alloc = total_objects > 3200 ? total_objects / 200 : 16;
ALLOC_ARRAY(fanout.entries, fanout.alloc);
ALLOC_ARRAY(deduplicated_entries, alloc_objects);
*nr_objects = 0;
ALLOC_ARRAY(ctx->entries, alloc_objects);
ctx->entries_nr = 0;
for (cur_fanout = 0; cur_fanout < 256; cur_fanout++) {
fanout.nr = 0;
if (m)
midx_fanout_add_midx_fanout(&fanout, m, cur_fanout,
preferred_pack);
if (ctx->m)
midx_fanout_add_midx_fanout(&fanout, ctx->m, cur_fanout,
ctx->preferred_pack_idx);
for (cur_pack = start_pack; cur_pack < nr_packs; cur_pack++) {
int preferred = cur_pack == preferred_pack;
for (cur_pack = start_pack; cur_pack < ctx->nr; cur_pack++) {
int preferred = cur_pack == ctx->preferred_pack_idx;
midx_fanout_add_pack_fanout(&fanout,
info, cur_pack,
ctx->info, cur_pack,
preferred, cur_fanout);
}
if (-1 < preferred_pack && preferred_pack < start_pack)
midx_fanout_add_pack_fanout(&fanout, info,
preferred_pack, 1,
if (-1 < ctx->preferred_pack_idx && ctx->preferred_pack_idx < start_pack)
midx_fanout_add_pack_fanout(&fanout, ctx->info,
ctx->preferred_pack_idx, 1,
cur_fanout);
midx_fanout_sort(&fanout);
@ -356,17 +351,16 @@ static struct pack_midx_entry *get_sorted_entries(struct multi_pack_index *m,
&fanout.entries[cur_object].oid))
continue;
ALLOC_GROW(deduplicated_entries, st_add(*nr_objects, 1),
ALLOC_GROW(ctx->entries, st_add(ctx->entries_nr, 1),
alloc_objects);
memcpy(&deduplicated_entries[*nr_objects],
memcpy(&ctx->entries[ctx->entries_nr],
&fanout.entries[cur_object],
sizeof(struct pack_midx_entry));
(*nr_objects)++;
ctx->entries_nr++;
}
}
free(fanout.entries);
return deduplicated_entries;
}
static int write_midx_pack_names(struct hashfile *f, void *data)
@ -1054,8 +1048,7 @@ static int write_midx_internal(const char *object_dir,
}
}
ctx.entries = get_sorted_entries(ctx.m, ctx.info, ctx.nr, &ctx.entries_nr,
ctx.preferred_pack_idx);
compute_sorted_entries(&ctx);
ctx.large_offsets_needed = 0;
for (i = 0; i < ctx.entries_nr; i++) {