#include "cache.h"
+#include "config.h"
#include "csum-file.h"
#include "dir.h"
#include "lockfile.h"
#include "packfile.h"
#include "object-store.h"
-#include "packfile.h"
+#include "sha1-lookup.h"
#include "midx.h"
#define MIDX_SIGNATURE 0x4d494458 /* "MIDX" */
#define MIDX_HASH_LEN 20
#define MIDX_MIN_SIZE (MIDX_HEADER_SIZE + MIDX_HASH_LEN)
-#define MIDX_MAX_CHUNKS 2
+#define MIDX_MAX_CHUNKS 5
#define MIDX_CHUNK_ALIGNMENT 4
#define MIDX_CHUNKID_PACKNAMES 0x504e414d /* "PNAM" */
+#define MIDX_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */
#define MIDX_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */
+#define MIDX_CHUNKID_OBJECTOFFSETS 0x4f4f4646 /* "OOFF" */
+#define MIDX_CHUNKID_LARGEOFFSETS 0x4c4f4646 /* "LOFF" */
#define MIDX_CHUNKLOOKUP_WIDTH (sizeof(uint32_t) + sizeof(uint64_t))
+#define MIDX_CHUNK_FANOUT_SIZE (sizeof(uint32_t) * 256)
+#define MIDX_CHUNK_OFFSET_WIDTH (2 * sizeof(uint32_t))
+#define MIDX_CHUNK_LARGE_OFFSET_WIDTH (sizeof(uint64_t))
+#define MIDX_LARGE_OFFSET_NEEDED 0x80000000
static char *get_midx_filename(const char *object_dir)
{
m->chunk_pack_names = m->data + chunk_offset;
break;
+ case MIDX_CHUNKID_OIDFANOUT:
+ m->chunk_oid_fanout = (uint32_t *)(m->data + chunk_offset);
+ break;
+
case MIDX_CHUNKID_OIDLOOKUP:
m->chunk_oid_lookup = m->data + chunk_offset;
break;
+ case MIDX_CHUNKID_OBJECTOFFSETS:
+ m->chunk_object_offsets = m->data + chunk_offset;
+ break;
+
+ case MIDX_CHUNKID_LARGEOFFSETS:
+ m->chunk_large_offsets = m->data + chunk_offset;
+ break;
+
case 0:
die(_("terminating multi-pack-index chunk id appears earlier than expected"));
break;
if (!m->chunk_pack_names)
die(_("multi-pack-index missing required pack-name chunk"));
+ if (!m->chunk_oid_fanout)
+ die(_("multi-pack-index missing required OID fanout chunk"));
if (!m->chunk_oid_lookup)
die(_("multi-pack-index missing required OID lookup chunk"));
+ if (!m->chunk_object_offsets)
+ die(_("multi-pack-index missing required object offsets chunk"));
+
+ m->num_objects = ntohl(m->chunk_oid_fanout[255]);
m->pack_names = xcalloc(m->num_packs, sizeof(*m->pack_names));
+ m->packs = xcalloc(m->num_packs, sizeof(*m->packs));
cur_pack_name = (const char *)m->chunk_pack_names;
for (i = 0; i < m->num_packs; i++) {
return NULL;
}
+static void close_midx(struct multi_pack_index *m)
+{
+ uint32_t i;
+ munmap((unsigned char *)m->data, m->data_len);
+ close(m->fd);
+ m->fd = -1;
+
+ for (i = 0; i < m->num_packs; i++) {
+ if (m->packs[i]) {
+ close_pack(m->packs[i]);
+ free(m->packs);
+ }
+ }
+ FREE_AND_NULL(m->packs);
+ FREE_AND_NULL(m->pack_names);
+}
+
+static int prepare_midx_pack(struct multi_pack_index *m, uint32_t pack_int_id)
+{
+ struct strbuf pack_name = STRBUF_INIT;
+
+ if (pack_int_id >= m->num_packs)
+ BUG("bad pack-int-id");
+
+ if (m->packs[pack_int_id])
+ return 0;
+
+ strbuf_addf(&pack_name, "%s/pack/%s", m->object_dir,
+ m->pack_names[pack_int_id]);
+
+ m->packs[pack_int_id] = add_packed_git(pack_name.buf, pack_name.len, 1);
+ strbuf_release(&pack_name);
+ return !m->packs[pack_int_id];
+}
+
+int bsearch_midx(const struct object_id *oid, struct multi_pack_index *m, uint32_t *result)
+{
+ return bsearch_hash(oid->hash, m->chunk_oid_fanout, m->chunk_oid_lookup,
+ MIDX_HASH_LEN, result);
+}
+
+struct object_id *nth_midxed_object_oid(struct object_id *oid,
+ struct multi_pack_index *m,
+ uint32_t n)
+{
+ if (n >= m->num_objects)
+ return NULL;
+
+ hashcpy(oid->hash, m->chunk_oid_lookup + m->hash_len * n);
+ return oid;
+}
+
+static off_t nth_midxed_offset(struct multi_pack_index *m, uint32_t pos)
+{
+ const unsigned char *offset_data;
+ uint32_t offset32;
+
+ offset_data = m->chunk_object_offsets + pos * MIDX_CHUNK_OFFSET_WIDTH;
+ offset32 = get_be32(offset_data + sizeof(uint32_t));
+
+ if (m->chunk_large_offsets && offset32 & MIDX_LARGE_OFFSET_NEEDED) {
+ if (sizeof(offset32) < sizeof(uint64_t))
+ die(_("multi-pack-index stores a 64-bit offset, but off_t is too small"));
+
+ offset32 ^= MIDX_LARGE_OFFSET_NEEDED;
+ return get_be64(m->chunk_large_offsets + sizeof(uint64_t) * offset32);
+ }
+
+ return offset32;
+}
+
+static uint32_t nth_midxed_pack_int_id(struct multi_pack_index *m, uint32_t pos)
+{
+ return get_be32(m->chunk_object_offsets + pos * MIDX_CHUNK_OFFSET_WIDTH);
+}
+
+static int nth_midxed_pack_entry(struct multi_pack_index *m, struct pack_entry *e, uint32_t pos)
+{
+ uint32_t pack_int_id;
+ struct packed_git *p;
+
+ if (pos >= m->num_objects)
+ return 0;
+
+ pack_int_id = nth_midxed_pack_int_id(m, pos);
+
+ if (prepare_midx_pack(m, pack_int_id))
+ die(_("error preparing packfile from multi-pack-index"));
+ p = m->packs[pack_int_id];
+
+ /*
+ * We are about to tell the caller where they can locate the
+ * requested object. We better make sure the packfile is
+ * still here and can be accessed before supplying that
+ * answer, as it may have been deleted since the MIDX was
+ * loaded!
+ */
+ if (!is_pack_valid(p))
+ return 0;
+
+ e->offset = nth_midxed_offset(m, pos);
+ e->p = p;
+
+ return 1;
+}
+
+int fill_midx_entry(const struct object_id *oid, struct pack_entry *e, struct multi_pack_index *m)
+{
+ uint32_t pos;
+
+ if (!bsearch_midx(oid, m, &pos))
+ return 0;
+
+ return nth_midxed_pack_entry(m, e, pos);
+}
+
+int midx_contains_pack(struct multi_pack_index *m, const char *idx_name)
+{
+ uint32_t first = 0, last = m->num_packs;
+
+ while (first < last) {
+ uint32_t mid = first + (last - first) / 2;
+ const char *current;
+ int cmp;
+
+ current = m->pack_names[mid];
+ cmp = strcmp(idx_name, current);
+ if (!cmp)
+ return 1;
+ if (cmp > 0) {
+ first = mid + 1;
+ continue;
+ }
+ last = mid;
+ }
+
+ return 0;
+}
+
+int prepare_multi_pack_index_one(struct repository *r, const char *object_dir)
+{
+ struct multi_pack_index *m = r->objects->multi_pack_index;
+ struct multi_pack_index *m_search;
+ int config_value;
+
+ if (repo_config_get_bool(r, "core.multipackindex", &config_value) ||
+ !config_value)
+ return 0;
+
+ for (m_search = m; m_search; m_search = m_search->next)
+ if (!strcmp(object_dir, m_search->object_dir))
+ return 1;
+
+ r->objects->multi_pack_index = load_multi_pack_index(object_dir);
+
+ if (r->objects->multi_pack_index) {
+ r->objects->multi_pack_index->next = m;
+ return 1;
+ }
+
+ return 0;
+}
+
static size_t write_midx_header(struct hashfile *f,
unsigned char num_chunks,
uint32_t num_packs)
uint32_t alloc_list;
uint32_t alloc_names;
size_t pack_name_concat_len;
+ struct multi_pack_index *m;
};
static void add_pack_to_midx(const char *full_path, size_t full_path_len,
struct pack_list *packs = (struct pack_list *)data;
if (ends_with(file_name, ".idx")) {
+ if (packs->m && midx_contains_pack(packs->m, file_name))
+ return;
+
ALLOC_GROW(packs->list, packs->nr + 1, packs->alloc_list);
ALLOC_GROW(packs->names, packs->nr + 1, packs->alloc_names);
return a->pack_int_id - b->pack_int_id;
}
+static int nth_midxed_pack_midx_entry(struct multi_pack_index *m,
+ uint32_t *pack_perm,
+ struct pack_midx_entry *e,
+ uint32_t pos)
+{
+ if (pos >= m->num_objects)
+ return 1;
+
+ nth_midxed_object_oid(&e->oid, m, pos);
+ e->pack_int_id = pack_perm[nth_midxed_pack_int_id(m, pos)];
+ e->offset = nth_midxed_offset(m, pos);
+
+ /* consider objects in midx to be from "old" packs */
+ e->pack_mtime = 0;
+ return 0;
+}
+
static void fill_pack_entry(uint32_t pack_int_id,
struct packed_git *p,
uint32_t cur_object,
* 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 packed_git **p,
+static struct pack_midx_entry *get_sorted_entries(struct multi_pack_index *m,
+ struct packed_git **p,
uint32_t *perm,
uint32_t nr_packs,
uint32_t *nr_objects)
uint32_t alloc_fanout, alloc_objects, total_objects = 0;
struct pack_midx_entry *entries_by_fanout = NULL;
struct pack_midx_entry *deduplicated_entries = NULL;
+ uint32_t start_pack = m ? m->num_packs : 0;
- for (cur_pack = 0; cur_pack < nr_packs; cur_pack++)
+ for (cur_pack = start_pack; cur_pack < nr_packs; cur_pack++)
total_objects += p[cur_pack]->num_objects;
/*
for (cur_fanout = 0; cur_fanout < 256; cur_fanout++) {
uint32_t nr_fanout = 0;
- for (cur_pack = 0; cur_pack < nr_packs; cur_pack++) {
+ if (m) {
+ uint32_t start = 0, end;
+
+ if (cur_fanout)
+ start = ntohl(m->chunk_oid_fanout[cur_fanout - 1]);
+ end = ntohl(m->chunk_oid_fanout[cur_fanout]);
+
+ for (cur_object = start; cur_object < end; cur_object++) {
+ ALLOC_GROW(entries_by_fanout, nr_fanout + 1, alloc_fanout);
+ nth_midxed_pack_midx_entry(m, perm,
+ &entries_by_fanout[nr_fanout],
+ cur_object);
+ nr_fanout++;
+ }
+ }
+
+ for (cur_pack = start_pack; cur_pack < nr_packs; cur_pack++) {
uint32_t start = 0, end;
if (cur_fanout)
return written;
}
+static size_t write_midx_oid_fanout(struct hashfile *f,
+ struct pack_midx_entry *objects,
+ uint32_t nr_objects)
+{
+ struct pack_midx_entry *list = objects;
+ struct pack_midx_entry *last = objects + nr_objects;
+ uint32_t count = 0;
+ uint32_t i;
+
+ /*
+ * Write the first-level table (the list is sorted,
+ * but we use a 256-entry lookup to be able to avoid
+ * having to do eight extra binary search iterations).
+ */
+ for (i = 0; i < 256; i++) {
+ struct pack_midx_entry *next = list;
+
+ while (next < last && next->oid.hash[0] == i) {
+ count++;
+ next++;
+ }
+
+ hashwrite_be32(f, count);
+ list = next;
+ }
+
+ return MIDX_CHUNK_FANOUT_SIZE;
+}
+
static size_t write_midx_oid_lookup(struct hashfile *f, unsigned char hash_len,
struct pack_midx_entry *objects,
uint32_t nr_objects)
return written;
}
+static size_t write_midx_object_offsets(struct hashfile *f, int large_offset_needed,
+ struct pack_midx_entry *objects, uint32_t nr_objects)
+{
+ struct pack_midx_entry *list = objects;
+ uint32_t i, nr_large_offset = 0;
+ size_t written = 0;
+
+ for (i = 0; i < nr_objects; i++) {
+ struct pack_midx_entry *obj = list++;
+
+ hashwrite_be32(f, obj->pack_int_id);
+
+ if (large_offset_needed && obj->offset >> 31)
+ hashwrite_be32(f, MIDX_LARGE_OFFSET_NEEDED | nr_large_offset++);
+ else if (!large_offset_needed && obj->offset >> 32)
+ BUG("object %s requires a large offset (%"PRIx64") but the MIDX is not writing large offsets!",
+ oid_to_hex(&obj->oid),
+ obj->offset);
+ else
+ hashwrite_be32(f, (uint32_t)obj->offset);
+
+ written += MIDX_CHUNK_OFFSET_WIDTH;
+ }
+
+ return written;
+}
+
+static size_t write_midx_large_offsets(struct hashfile *f, uint32_t nr_large_offset,
+ struct pack_midx_entry *objects, uint32_t nr_objects)
+{
+ struct pack_midx_entry *list = objects;
+ size_t written = 0;
+
+ while (nr_large_offset) {
+ struct pack_midx_entry *obj = list++;
+ uint64_t offset = obj->offset;
+
+ if (!(offset >> 31))
+ continue;
+
+ hashwrite_be32(f, offset >> 32);
+ hashwrite_be32(f, offset & 0xffffffffUL);
+ written += 2 * sizeof(uint32_t);
+
+ nr_large_offset--;
+ }
+
+ return written;
+}
+
int write_midx_file(const char *object_dir)
{
unsigned char cur_chunk, num_chunks = 0;
uint64_t written = 0;
uint32_t chunk_ids[MIDX_MAX_CHUNKS + 1];
uint64_t chunk_offsets[MIDX_MAX_CHUNKS + 1];
- uint32_t nr_entries;
+ uint32_t nr_entries, num_large_offsets = 0;
struct pack_midx_entry *entries = NULL;
+ int large_offsets_needed = 0;
midx_name = get_midx_filename(object_dir);
if (safe_create_leading_directories(midx_name)) {
midx_name);
}
+ packs.m = load_multi_pack_index(object_dir);
+
packs.nr = 0;
- packs.alloc_list = 16;
- packs.alloc_names = 16;
+ packs.alloc_list = packs.m ? packs.m->num_packs : 16;
+ packs.alloc_names = packs.alloc_list;
packs.list = NULL;
+ packs.names = NULL;
packs.pack_name_concat_len = 0;
ALLOC_ARRAY(packs.list, packs.alloc_list);
ALLOC_ARRAY(packs.names, packs.alloc_names);
+ if (packs.m) {
+ for (i = 0; i < packs.m->num_packs; i++) {
+ ALLOC_GROW(packs.list, packs.nr + 1, packs.alloc_list);
+ ALLOC_GROW(packs.names, packs.nr + 1, packs.alloc_names);
+
+ packs.list[packs.nr] = NULL;
+ packs.names[packs.nr] = xstrdup(packs.m->pack_names[i]);
+ packs.pack_name_concat_len += strlen(packs.names[packs.nr]) + 1;
+ packs.nr++;
+ }
+ }
+
for_each_file_in_pack_dir(object_dir, add_pack_to_midx, &packs);
+ if (packs.m && packs.nr == packs.m->num_packs)
+ goto cleanup;
+
if (packs.pack_name_concat_len % MIDX_CHUNK_ALIGNMENT)
packs.pack_name_concat_len += MIDX_CHUNK_ALIGNMENT -
(packs.pack_name_concat_len % MIDX_CHUNK_ALIGNMENT);
ALLOC_ARRAY(pack_perm, packs.nr);
sort_packs_by_name(packs.names, packs.nr, pack_perm);
- entries = get_sorted_entries(packs.list, pack_perm, packs.nr, &nr_entries);
+ entries = get_sorted_entries(packs.m, packs.list, pack_perm, packs.nr, &nr_entries);
+
+ for (i = 0; i < nr_entries; i++) {
+ if (entries[i].offset > 0x7fffffff)
+ num_large_offsets++;
+ if (entries[i].offset > 0xffffffff)
+ large_offsets_needed = 1;
+ }
hold_lock_file_for_update(&lk, midx_name, LOCK_DIE_ON_ERROR);
f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
FREE_AND_NULL(midx_name);
+ if (packs.m)
+ close_midx(packs.m);
+
cur_chunk = 0;
- num_chunks = 2;
+ num_chunks = large_offsets_needed ? 5 : 4;
written = write_midx_header(f, num_chunks, packs.nr);
chunk_offsets[cur_chunk] = written + (num_chunks + 1) * MIDX_CHUNKLOOKUP_WIDTH;
cur_chunk++;
- chunk_ids[cur_chunk] = MIDX_CHUNKID_OIDLOOKUP;
+ chunk_ids[cur_chunk] = MIDX_CHUNKID_OIDFANOUT;
chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + packs.pack_name_concat_len;
cur_chunk++;
- chunk_ids[cur_chunk] = 0;
+ chunk_ids[cur_chunk] = MIDX_CHUNKID_OIDLOOKUP;
+ chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + MIDX_CHUNK_FANOUT_SIZE;
+
+ cur_chunk++;
+ chunk_ids[cur_chunk] = MIDX_CHUNKID_OBJECTOFFSETS;
chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + nr_entries * MIDX_HASH_LEN;
+ cur_chunk++;
+ chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + nr_entries * MIDX_CHUNK_OFFSET_WIDTH;
+ if (large_offsets_needed) {
+ chunk_ids[cur_chunk] = MIDX_CHUNKID_LARGEOFFSETS;
+
+ cur_chunk++;
+ chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] +
+ num_large_offsets * MIDX_CHUNK_LARGE_OFFSET_WIDTH;
+ }
+
+ chunk_ids[cur_chunk] = 0;
+
for (i = 0; i <= num_chunks; i++) {
if (i && chunk_offsets[i] < chunk_offsets[i - 1])
BUG("incorrect chunk offsets: %"PRIu64" before %"PRIu64,
written += write_midx_pack_names(f, packs.names, packs.nr);
break;
+ case MIDX_CHUNKID_OIDFANOUT:
+ written += write_midx_oid_fanout(f, entries, nr_entries);
+ break;
+
case MIDX_CHUNKID_OIDLOOKUP:
written += write_midx_oid_lookup(f, MIDX_HASH_LEN, entries, nr_entries);
break;
+ case MIDX_CHUNKID_OBJECTOFFSETS:
+ written += write_midx_object_offsets(f, large_offsets_needed, entries, nr_entries);
+ break;
+
+ case MIDX_CHUNKID_LARGEOFFSETS:
+ written += write_midx_large_offsets(f, num_large_offsets, entries, nr_entries);
+ break;
+
default:
BUG("trying to write unknown chunk id %"PRIx32,
chunk_ids[i]);
finalize_hashfile(f, NULL, CSUM_FSYNC | CSUM_HASH_IN_STREAM);
commit_lock_file(&lk);
+cleanup:
for (i = 0; i < packs.nr; i++) {
if (packs.list[i]) {
close_pack(packs.list[i]);
free(packs.list);
free(packs.names);
free(entries);
+ free(pack_perm);
+ free(midx_name);
return 0;
}