Merge branch 'jn/mailmap-update'
[gitweb.git] / midx.c
diff --git a/midx.c b/midx.c
index f85f2d334d4762119f403d8a42292486e15640aa..713d6f9dde677d5418f5a4576c58e38646f90c58 100644 (file)
--- a/midx.c
+++ b/midx.c
 #include "cache.h"
+#include "config.h"
 #include "csum-file.h"
+#include "dir.h"
 #include "lockfile.h"
+#include "packfile.h"
+#include "object-store.h"
+#include "sha1-lookup.h"
 #include "midx.h"
+#include "progress.h"
 
 #define MIDX_SIGNATURE 0x4d494458 /* "MIDX" */
 #define MIDX_VERSION 1
+#define MIDX_BYTE_FILE_VERSION 4
+#define MIDX_BYTE_HASH_VERSION 5
+#define MIDX_BYTE_NUM_CHUNKS 6
+#define MIDX_BYTE_NUM_PACKS 8
 #define MIDX_HASH_VERSION 1
 #define MIDX_HEADER_SIZE 12
+#define MIDX_HASH_LEN 20
+#define MIDX_MIN_SIZE (MIDX_HEADER_SIZE + MIDX_HASH_LEN)
+
+#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)
 {
        return xstrfmt("%s/pack/multi-pack-index", object_dir);
 }
 
+struct multi_pack_index *load_multi_pack_index(const char *object_dir, int local)
+{
+       struct multi_pack_index *m = NULL;
+       int fd;
+       struct stat st;
+       size_t midx_size;
+       void *midx_map = NULL;
+       uint32_t hash_version;
+       char *midx_name = get_midx_filename(object_dir);
+       uint32_t i;
+       const char *cur_pack_name;
+
+       fd = git_open(midx_name);
+
+       if (fd < 0)
+               goto cleanup_fail;
+       if (fstat(fd, &st)) {
+               error_errno(_("failed to read %s"), midx_name);
+               goto cleanup_fail;
+       }
+
+       midx_size = xsize_t(st.st_size);
+
+       if (midx_size < MIDX_MIN_SIZE) {
+               error(_("multi-pack-index file %s is too small"), midx_name);
+               goto cleanup_fail;
+       }
+
+       FREE_AND_NULL(midx_name);
+
+       midx_map = xmmap(NULL, midx_size, PROT_READ, MAP_PRIVATE, fd, 0);
+
+       FLEX_ALLOC_MEM(m, object_dir, object_dir, strlen(object_dir));
+       m->fd = fd;
+       m->data = midx_map;
+       m->data_len = midx_size;
+       m->local = local;
+
+       m->signature = get_be32(m->data);
+       if (m->signature != MIDX_SIGNATURE)
+               die(_("multi-pack-index signature 0x%08x does not match signature 0x%08x"),
+                     m->signature, MIDX_SIGNATURE);
+
+       m->version = m->data[MIDX_BYTE_FILE_VERSION];
+       if (m->version != MIDX_VERSION)
+               die(_("multi-pack-index version %d not recognized"),
+                     m->version);
+
+       hash_version = m->data[MIDX_BYTE_HASH_VERSION];
+       if (hash_version != MIDX_HASH_VERSION)
+               die(_("hash version %u does not match"), hash_version);
+       m->hash_len = MIDX_HASH_LEN;
+
+       m->num_chunks = m->data[MIDX_BYTE_NUM_CHUNKS];
+
+       m->num_packs = get_be32(m->data + MIDX_BYTE_NUM_PACKS);
+
+       for (i = 0; i < m->num_chunks; i++) {
+               uint32_t chunk_id = get_be32(m->data + MIDX_HEADER_SIZE +
+                                            MIDX_CHUNKLOOKUP_WIDTH * i);
+               uint64_t chunk_offset = get_be64(m->data + MIDX_HEADER_SIZE + 4 +
+                                                MIDX_CHUNKLOOKUP_WIDTH * i);
+
+               if (chunk_offset >= m->data_len)
+                       die(_("invalid chunk offset (too large)"));
+
+               switch (chunk_id) {
+                       case MIDX_CHUNKID_PACKNAMES:
+                               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;
+
+                       default:
+                               /*
+                                * Do nothing on unrecognized chunks, allowing future
+                                * extensions to add optional chunks.
+                                */
+                               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++) {
+               m->pack_names[i] = cur_pack_name;
+
+               cur_pack_name += strlen(cur_pack_name) + 1;
+
+               if (i && strcmp(m->pack_names[i], m->pack_names[i - 1]) <= 0)
+                       die(_("multi-pack-index pack names out of order: '%s' before '%s'"),
+                             m->pack_names[i - 1],
+                             m->pack_names[i]);
+       }
+
+       return m;
+
+cleanup_fail:
+       free(m);
+       free(midx_name);
+       if (midx_map)
+               munmap(midx_map, midx_size);
+       if (0 <= fd)
+               close(fd);
+       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);
+}
+
+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)
+               die(_("bad pack-int-id: %u (%u total packs"),
+                   pack_int_id, m->num_packs);
+
+       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, m->local);
+       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(off_t) < 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;
+
+       if (p->num_bad_objects) {
+               uint32_t i;
+               struct object_id oid;
+               nth_midxed_object_oid(&oid, m, pos);
+               for (i = 0; i < p->num_bad_objects; i++)
+                       if (!hashcmp(oid.hash,
+                                    p->bad_object_sha1 + the_hash_algo->rawsz * i))
+                               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, int local)
+{
+       struct multi_pack_index *m;
+       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 = r->objects->multi_pack_index; m_search; m_search = m_search->next)
+               if (!strcmp(object_dir, m_search->object_dir))
+                       return 1;
+
+       m = load_multi_pack_index(object_dir, local);
+
+       if (m) {
+               m->next = r->objects->multi_pack_index;
+               r->objects->multi_pack_index = m;
+               return 1;
+       }
+
+       return 0;
+}
+
 static size_t write_midx_header(struct hashfile *f,
                                unsigned char num_chunks,
                                uint32_t num_packs)
@@ -30,12 +368,385 @@ static size_t write_midx_header(struct hashfile *f,
        return MIDX_HEADER_SIZE;
 }
 
+struct pack_list {
+       struct packed_git **list;
+       char **names;
+       uint32_t nr;
+       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,
+                            const char *file_name, void *data)
+{
+       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);
+
+               packs->list[packs->nr] = add_packed_git(full_path,
+                                                       full_path_len,
+                                                       0);
+
+               if (!packs->list[packs->nr]) {
+                       warning(_("failed to add packfile '%s'"),
+                               full_path);
+                       return;
+               }
+
+               if (open_pack_index(packs->list[packs->nr])) {
+                       warning(_("failed to open pack-index '%s'"),
+                               full_path);
+                       close_pack(packs->list[packs->nr]);
+                       FREE_AND_NULL(packs->list[packs->nr]);
+                       return;
+               }
+
+               packs->names[packs->nr] = xstrdup(file_name);
+               packs->pack_name_concat_len += strlen(file_name) + 1;
+               packs->nr++;
+       }
+}
+
+struct pack_pair {
+       uint32_t pack_int_id;
+       char *pack_name;
+};
+
+static int pack_pair_compare(const void *_a, const void *_b)
+{
+       struct pack_pair *a = (struct pack_pair *)_a;
+       struct pack_pair *b = (struct pack_pair *)_b;
+       return strcmp(a->pack_name, b->pack_name);
+}
+
+static void sort_packs_by_name(char **pack_names, uint32_t nr_packs, uint32_t *perm)
+{
+       uint32_t i;
+       struct pack_pair *pairs;
+
+       ALLOC_ARRAY(pairs, nr_packs);
+
+       for (i = 0; i < nr_packs; i++) {
+               pairs[i].pack_int_id = i;
+               pairs[i].pack_name = pack_names[i];
+       }
+
+       QSORT(pairs, nr_packs, pack_pair_compare);
+
+       for (i = 0; i < nr_packs; i++) {
+               pack_names[i] = pairs[i].pack_name;
+               perm[pairs[i].pack_int_id] = i;
+       }
+
+       free(pairs);
+}
+
+struct pack_midx_entry {
+       struct object_id oid;
+       uint32_t pack_int_id;
+       time_t pack_mtime;
+       uint64_t offset;
+};
+
+static int midx_oid_compare(const void *_a, const void *_b)
+{
+       const struct pack_midx_entry *a = (const struct pack_midx_entry *)_a;
+       const struct pack_midx_entry *b = (const struct pack_midx_entry *)_b;
+       int cmp = oidcmp(&a->oid, &b->oid);
+
+       if (cmp)
+               return cmp;
+
+       if (a->pack_mtime > b->pack_mtime)
+               return -1;
+       else if (a->pack_mtime < b->pack_mtime)
+               return 1;
+
+       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,
+                           struct pack_midx_entry *entry)
+{
+       if (!nth_packed_object_oid(&entry->oid, p, cur_object))
+               die(_("failed to locate object %d in packfile"), cur_object);
+
+       entry->pack_int_id = pack_int_id;
+       entry->pack_mtime = p->mtime;
+
+       entry->offset = nth_packed_object_offset(p, cur_object);
+}
+
+/*
+ * It is possible to artificially get into a state where there are many
+ * duplicate copies of objects. That can create high memory pressure if
+ * we are to create a list of all objects before de-duplication. To reduce
+ * this memory pressure without a significant performance drop, automatically
+ * group objects by the first byte of their object id. Use the IDX fanout
+ * tables to group the data, copy to a local array, then sort.
+ *
+ * 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 packed_git **p,
+                                                 uint32_t *perm,
+                                                 uint32_t nr_packs,
+                                                 uint32_t *nr_objects)
+{
+       uint32_t cur_fanout, cur_pack, cur_object;
+       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 = start_pack; cur_pack < nr_packs; cur_pack++)
+               total_objects += p[cur_pack]->num_objects;
+
+       /*
+        * As we de-duplicate by fanout value, we expect the fanout
+        * slices to be evenly distributed, with some noise. Hence,
+        * allocate slightly more than one 256th.
+        */
+       alloc_objects = alloc_fanout = total_objects > 3200 ? total_objects / 200 : 16;
+
+       ALLOC_ARRAY(entries_by_fanout, alloc_fanout);
+       ALLOC_ARRAY(deduplicated_entries, alloc_objects);
+       *nr_objects = 0;
+
+       for (cur_fanout = 0; cur_fanout < 256; cur_fanout++) {
+               uint32_t nr_fanout = 0;
+
+               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)
+                               start = get_pack_fanout(p[cur_pack], cur_fanout - 1);
+                       end = get_pack_fanout(p[cur_pack], cur_fanout);
+
+                       for (cur_object = start; cur_object < end; cur_object++) {
+                               ALLOC_GROW(entries_by_fanout, nr_fanout + 1, alloc_fanout);
+                               fill_pack_entry(perm[cur_pack], p[cur_pack], cur_object, &entries_by_fanout[nr_fanout]);
+                               nr_fanout++;
+                       }
+               }
+
+               QSORT(entries_by_fanout, nr_fanout, midx_oid_compare);
+
+               /*
+                * The batch is now sorted by OID and then mtime (descending).
+                * Take only the first duplicate.
+                */
+               for (cur_object = 0; cur_object < nr_fanout; cur_object++) {
+                       if (cur_object && !oidcmp(&entries_by_fanout[cur_object - 1].oid,
+                                                 &entries_by_fanout[cur_object].oid))
+                               continue;
+
+                       ALLOC_GROW(deduplicated_entries, *nr_objects + 1, alloc_objects);
+                       memcpy(&deduplicated_entries[*nr_objects],
+                              &entries_by_fanout[cur_object],
+                              sizeof(struct pack_midx_entry));
+                       (*nr_objects)++;
+               }
+       }
+
+       free(entries_by_fanout);
+       return deduplicated_entries;
+}
+
+static size_t write_midx_pack_names(struct hashfile *f,
+                                   char **pack_names,
+                                   uint32_t num_packs)
+{
+       uint32_t i;
+       unsigned char padding[MIDX_CHUNK_ALIGNMENT];
+       size_t written = 0;
+
+       for (i = 0; i < num_packs; i++) {
+               size_t writelen = strlen(pack_names[i]) + 1;
+
+               if (i && strcmp(pack_names[i], pack_names[i - 1]) <= 0)
+                       BUG("incorrect pack-file order: %s before %s",
+                           pack_names[i - 1],
+                           pack_names[i]);
+
+               hashwrite(f, pack_names[i], writelen);
+               written += writelen;
+       }
+
+       /* add padding to be aligned */
+       i = MIDX_CHUNK_ALIGNMENT - (written % MIDX_CHUNK_ALIGNMENT);
+       if (i < MIDX_CHUNK_ALIGNMENT) {
+               memset(padding, 0, sizeof(padding));
+               hashwrite(f, padding, i);
+               written += i;
+       }
+
+       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)
+{
+       struct pack_midx_entry *list = objects;
+       uint32_t i;
+       size_t written = 0;
+
+       for (i = 0; i < nr_objects; i++) {
+               struct pack_midx_entry *obj = list++;
+
+               if (i < nr_objects - 1) {
+                       struct pack_midx_entry *next = list;
+                       if (oidcmp(&obj->oid, &next->oid) >= 0)
+                               BUG("OIDs not in order: %s >= %s",
+                                   oid_to_hex(&obj->oid),
+                                   oid_to_hex(&next->oid));
+               }
+
+               hashwrite(f, obj->oid.hash, (int)hash_len);
+               written += hash_len;
+       }
+
+       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 num_chunks = 0;
+       unsigned char cur_chunk, num_chunks = 0;
        char *midx_name;
+       uint32_t i;
        struct hashfile *f = NULL;
        struct lock_file lk;
+       struct pack_list packs;
+       uint32_t *pack_perm = NULL;
+       uint64_t written = 0;
+       uint32_t chunk_ids[MIDX_MAX_CHUNKS + 1];
+       uint64_t chunk_offsets[MIDX_MAX_CHUNKS + 1];
+       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)) {
@@ -44,14 +755,253 @@ int write_midx_file(const char *object_dir)
                          midx_name);
        }
 
+       packs.m = load_multi_pack_index(object_dir, 1);
+
+       packs.nr = 0;
+       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.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);
 
-       write_midx_header(f, num_chunks, 0);
+       if (packs.m)
+               close_midx(packs.m);
+
+       cur_chunk = 0;
+       num_chunks = large_offsets_needed ? 5 : 4;
+
+       written = write_midx_header(f, num_chunks, packs.nr);
+
+       chunk_ids[cur_chunk] = MIDX_CHUNKID_PACKNAMES;
+       chunk_offsets[cur_chunk] = written + (num_chunks + 1) * MIDX_CHUNKLOOKUP_WIDTH;
+
+       cur_chunk++;
+       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] = 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,
+                           chunk_offsets[i - 1],
+                           chunk_offsets[i]);
+
+               if (chunk_offsets[i] % MIDX_CHUNK_ALIGNMENT)
+                       BUG("chunk offset %"PRIu64" is not properly aligned",
+                           chunk_offsets[i]);
+
+               hashwrite_be32(f, chunk_ids[i]);
+               hashwrite_be32(f, chunk_offsets[i] >> 32);
+               hashwrite_be32(f, chunk_offsets[i]);
+
+               written += MIDX_CHUNKLOOKUP_WIDTH;
+       }
+
+       for (i = 0; i < num_chunks; i++) {
+               if (written != chunk_offsets[i])
+                       BUG("incorrect chunk offset (%"PRIu64" != %"PRIu64") for chunk id %"PRIx32,
+                           chunk_offsets[i],
+                           written,
+                           chunk_ids[i]);
+
+               switch (chunk_ids[i]) {
+                       case MIDX_CHUNKID_PACKNAMES:
+                               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]);
+               }
+       }
+
+       if (written != chunk_offsets[num_chunks])
+               BUG("incorrect final offset %"PRIu64" != %"PRIu64,
+                   written,
+                   chunk_offsets[num_chunks]);
 
        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[i]);
+               }
+               free(packs.names[i]);
+       }
+
+       free(packs.list);
+       free(packs.names);
+       free(entries);
+       free(pack_perm);
+       free(midx_name);
        return 0;
 }
+
+void clear_midx_file(const char *object_dir)
+{
+       char *midx = get_midx_filename(object_dir);
+
+       if (remove_path(midx)) {
+               UNLEAK(midx);
+               die(_("failed to clear multi-pack-index at %s"), midx);
+       }
+
+       free(midx);
+}
+
+static int verify_midx_error;
+
+static void midx_report(const char *fmt, ...)
+{
+       va_list ap;
+       verify_midx_error = 1;
+       va_start(ap, fmt);
+       vfprintf(stderr, fmt, ap);
+       fprintf(stderr, "\n");
+       va_end(ap);
+}
+
+int verify_midx_file(const char *object_dir)
+{
+       uint32_t i;
+       struct progress *progress = NULL;
+       struct multi_pack_index *m = load_multi_pack_index(object_dir, 1);
+       verify_midx_error = 0;
+
+       if (!m)
+               return 0;
+
+       for (i = 0; i < m->num_packs; i++) {
+               if (prepare_midx_pack(m, i))
+                       midx_report("failed to load pack in position %d", i);
+       }
+
+       for (i = 0; i < 255; i++) {
+               uint32_t oid_fanout1 = ntohl(m->chunk_oid_fanout[i]);
+               uint32_t oid_fanout2 = ntohl(m->chunk_oid_fanout[i + 1]);
+
+               if (oid_fanout1 > oid_fanout2)
+                       midx_report(_("oid fanout out of order: fanout[%d] = %"PRIx32" > %"PRIx32" = fanout[%d]"),
+                                   i, oid_fanout1, oid_fanout2, i + 1);
+       }
+
+       for (i = 0; i < m->num_objects - 1; i++) {
+               struct object_id oid1, oid2;
+
+               nth_midxed_object_oid(&oid1, m, i);
+               nth_midxed_object_oid(&oid2, m, i + 1);
+
+               if (oidcmp(&oid1, &oid2) >= 0)
+                       midx_report(_("oid lookup out of order: oid[%d] = %s >= %s = oid[%d]"),
+                                   i, oid_to_hex(&oid1), oid_to_hex(&oid2), i + 1);
+       }
+
+       progress = start_progress(_("Verifying object offsets"), m->num_objects);
+       for (i = 0; i < m->num_objects; i++) {
+               struct object_id oid;
+               struct pack_entry e;
+               off_t m_offset, p_offset;
+
+               nth_midxed_object_oid(&oid, m, i);
+               if (!fill_midx_entry(&oid, &e, m)) {
+                       midx_report(_("failed to load pack entry for oid[%d] = %s"),
+                                   i, oid_to_hex(&oid));
+                       continue;
+               }
+
+               if (open_pack_index(e.p)) {
+                       midx_report(_("failed to load pack-index for packfile %s"),
+                                   e.p->pack_name);
+                       break;
+               }
+
+               m_offset = e.offset;
+               p_offset = find_pack_entry_one(oid.hash, e.p);
+
+               if (m_offset != p_offset)
+                       midx_report(_("incorrect object offset for oid[%d] = %s: %"PRIx64" != %"PRIx64),
+                                   i, oid_to_hex(&oid), m_offset, p_offset);
+
+               display_progress(progress, i + 1);
+       }
+       stop_progress(&progress);
+
+       return verify_midx_error;
+}