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![Taylor Blau](/assets/img/avatar_default.png)
When an old bitmap exists while writing a new one, we load it and build a "reposition" table which maps bit positions of objects from the old bitmap to their respective positions in the new bitmap. This can help when we encounter a commit which was selected in both the old and new bitmap, since we only need to permute its bit (not recompute it from scratch). We do not, however, repurpose existing namehash values in the case of the hash-cache extension. There has been thus far no good reason to do so, since all of the namehash values for objects in the new bitmap would be populated during the traversal that was just performed by pack-objects when generating single-pack reachability bitmaps. But this isn't the case for multi-pack bitmaps, which are written via `git multi-pack-index write --bitmap` and do not perform any traversal. In this case all namehash values are set to zero, but we don't even bother to check the `pack.writeBitmapHashcache` option anyway, so it fails to matter. There are two approaches we could take to fill in non-zero hash-cache values: - have either the multi-pack-index builtin run its own traversal to attempt to fill in some values, or let a hypothetical caller (like `pack-objects` when `repack` eventually drives the `multi-pack-index` builtin) fill in the values they found during their traversal - or copy any existing namehash values that were stored in an existing bitmap to their corresponding positions in the new bitmap In a system where a repository is generally repacked with `git repack --geometric=<d>` and occasionally repacked with `git repack -a`, the hash-cache coverage will tend towards all objects. Since populating the hash-cache is additive (i.e., doing so only helps our delta search), any intermediate lack of full coverage is just fine. So let's start by just propagating any values from the existing hash-cache if we see one. The next patch will respect the `pack.writeBitmapHashcache` option while writing MIDX bitmaps, and then test this new behavior. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2003 lines
50 KiB
C
2003 lines
50 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "tag.h"
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#include "diff.h"
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#include "revision.h"
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#include "progress.h"
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#include "list-objects.h"
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#include "pack.h"
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#include "pack-bitmap.h"
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#include "pack-revindex.h"
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#include "pack-objects.h"
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#include "packfile.h"
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#include "repository.h"
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#include "object-store.h"
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#include "list-objects-filter-options.h"
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#include "midx.h"
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#include "config.h"
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/*
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* An entry on the bitmap index, representing the bitmap for a given
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* commit.
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*/
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struct stored_bitmap {
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struct object_id oid;
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struct ewah_bitmap *root;
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struct stored_bitmap *xor;
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int flags;
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};
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/*
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* The active bitmap index for a repository. By design, repositories only have
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* a single bitmap index available (the index for the biggest packfile in
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* the repository), since bitmap indexes need full closure.
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*
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* If there is more than one bitmap index available (e.g. because of alternates),
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* the active bitmap index is the largest one.
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*/
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struct bitmap_index {
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/*
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* The pack or multi-pack index (MIDX) that this bitmap index belongs
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* to.
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*
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* Exactly one of these must be non-NULL; this specifies the object
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* order used to interpret this bitmap.
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*/
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struct packed_git *pack;
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struct multi_pack_index *midx;
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/*
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* Mark the first `reuse_objects` in the packfile as reused:
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* they will be sent as-is without using them for repacking
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* calculations
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*/
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uint32_t reuse_objects;
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/* mmapped buffer of the whole bitmap index */
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unsigned char *map;
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size_t map_size; /* size of the mmaped buffer */
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size_t map_pos; /* current position when loading the index */
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/*
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* Type indexes.
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*
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* Each bitmap marks which objects in the packfile are of the given
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* type. This provides type information when yielding the objects from
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* the packfile during a walk, which allows for better delta bases.
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*/
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struct ewah_bitmap *commits;
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struct ewah_bitmap *trees;
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struct ewah_bitmap *blobs;
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struct ewah_bitmap *tags;
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/* Map from object ID -> `stored_bitmap` for all the bitmapped commits */
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kh_oid_map_t *bitmaps;
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/* Number of bitmapped commits */
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uint32_t entry_count;
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/* If not NULL, this is a name-hash cache pointing into map. */
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uint32_t *hashes;
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/* The checksum of the packfile or MIDX; points into map. */
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const unsigned char *checksum;
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/*
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* Extended index.
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*
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* When trying to perform bitmap operations with objects that are not
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* packed in `pack`, these objects are added to this "fake index" and
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* are assumed to appear at the end of the packfile for all operations
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*/
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struct eindex {
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struct object **objects;
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uint32_t *hashes;
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uint32_t count, alloc;
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kh_oid_pos_t *positions;
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} ext_index;
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/* Bitmap result of the last performed walk */
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struct bitmap *result;
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/* "have" bitmap from the last performed walk */
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struct bitmap *haves;
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/* Version of the bitmap index */
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unsigned int version;
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};
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static struct ewah_bitmap *lookup_stored_bitmap(struct stored_bitmap *st)
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{
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struct ewah_bitmap *parent;
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struct ewah_bitmap *composed;
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if (st->xor == NULL)
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return st->root;
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composed = ewah_pool_new();
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parent = lookup_stored_bitmap(st->xor);
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ewah_xor(st->root, parent, composed);
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ewah_pool_free(st->root);
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st->root = composed;
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st->xor = NULL;
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return composed;
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}
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/*
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* Read a bitmap from the current read position on the mmaped
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* index, and increase the read position accordingly
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*/
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static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index)
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{
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struct ewah_bitmap *b = ewah_pool_new();
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ssize_t bitmap_size = ewah_read_mmap(b,
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index->map + index->map_pos,
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index->map_size - index->map_pos);
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if (bitmap_size < 0) {
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error("Failed to load bitmap index (corrupted?)");
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ewah_pool_free(b);
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return NULL;
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}
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index->map_pos += bitmap_size;
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return b;
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}
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static uint32_t bitmap_num_objects(struct bitmap_index *index)
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{
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if (index->midx)
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return index->midx->num_objects;
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return index->pack->num_objects;
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}
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static int load_bitmap_header(struct bitmap_index *index)
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{
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struct bitmap_disk_header *header = (void *)index->map;
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size_t header_size = sizeof(*header) - GIT_MAX_RAWSZ + the_hash_algo->rawsz;
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if (index->map_size < header_size + the_hash_algo->rawsz)
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return error("Corrupted bitmap index (too small)");
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if (memcmp(header->magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE)) != 0)
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return error("Corrupted bitmap index file (wrong header)");
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index->version = ntohs(header->version);
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if (index->version != 1)
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return error("Unsupported version for bitmap index file (%d)", index->version);
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/* Parse known bitmap format options */
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{
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uint32_t flags = ntohs(header->options);
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size_t cache_size = st_mult(bitmap_num_objects(index), sizeof(uint32_t));
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unsigned char *index_end = index->map + index->map_size - the_hash_algo->rawsz;
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if ((flags & BITMAP_OPT_FULL_DAG) == 0)
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return error("Unsupported options for bitmap index file "
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"(Git requires BITMAP_OPT_FULL_DAG)");
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if (flags & BITMAP_OPT_HASH_CACHE) {
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if (cache_size > index_end - index->map - header_size)
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return error("corrupted bitmap index file (too short to fit hash cache)");
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index->hashes = (void *)(index_end - cache_size);
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index_end -= cache_size;
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}
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}
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index->entry_count = ntohl(header->entry_count);
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index->checksum = header->checksum;
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index->map_pos += header_size;
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return 0;
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}
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static struct stored_bitmap *store_bitmap(struct bitmap_index *index,
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struct ewah_bitmap *root,
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const struct object_id *oid,
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struct stored_bitmap *xor_with,
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int flags)
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{
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struct stored_bitmap *stored;
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khiter_t hash_pos;
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int ret;
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stored = xmalloc(sizeof(struct stored_bitmap));
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stored->root = root;
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stored->xor = xor_with;
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stored->flags = flags;
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oidcpy(&stored->oid, oid);
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hash_pos = kh_put_oid_map(index->bitmaps, stored->oid, &ret);
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/* a 0 return code means the insertion succeeded with no changes,
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* because the SHA1 already existed on the map. this is bad, there
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* shouldn't be duplicated commits in the index */
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if (ret == 0) {
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error("Duplicate entry in bitmap index: %s", oid_to_hex(oid));
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return NULL;
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}
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kh_value(index->bitmaps, hash_pos) = stored;
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return stored;
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}
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static inline uint32_t read_be32(const unsigned char *buffer, size_t *pos)
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{
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uint32_t result = get_be32(buffer + *pos);
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(*pos) += sizeof(result);
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return result;
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}
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static inline uint8_t read_u8(const unsigned char *buffer, size_t *pos)
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{
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return buffer[(*pos)++];
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}
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#define MAX_XOR_OFFSET 160
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static int nth_bitmap_object_oid(struct bitmap_index *index,
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struct object_id *oid,
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uint32_t n)
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{
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if (index->midx)
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return nth_midxed_object_oid(oid, index->midx, n) ? 0 : -1;
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return nth_packed_object_id(oid, index->pack, n);
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}
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static int load_bitmap_entries_v1(struct bitmap_index *index)
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{
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uint32_t i;
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struct stored_bitmap *recent_bitmaps[MAX_XOR_OFFSET] = { NULL };
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for (i = 0; i < index->entry_count; ++i) {
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int xor_offset, flags;
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struct ewah_bitmap *bitmap = NULL;
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struct stored_bitmap *xor_bitmap = NULL;
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uint32_t commit_idx_pos;
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struct object_id oid;
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if (index->map_size - index->map_pos < 6)
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return error("corrupt ewah bitmap: truncated header for entry %d", i);
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commit_idx_pos = read_be32(index->map, &index->map_pos);
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xor_offset = read_u8(index->map, &index->map_pos);
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flags = read_u8(index->map, &index->map_pos);
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if (nth_bitmap_object_oid(index, &oid, commit_idx_pos) < 0)
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return error("corrupt ewah bitmap: commit index %u out of range",
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(unsigned)commit_idx_pos);
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bitmap = read_bitmap_1(index);
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if (!bitmap)
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return -1;
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if (xor_offset > MAX_XOR_OFFSET || xor_offset > i)
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return error("Corrupted bitmap pack index");
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if (xor_offset > 0) {
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xor_bitmap = recent_bitmaps[(i - xor_offset) % MAX_XOR_OFFSET];
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if (xor_bitmap == NULL)
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return error("Invalid XOR offset in bitmap pack index");
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}
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recent_bitmaps[i % MAX_XOR_OFFSET] = store_bitmap(
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index, bitmap, &oid, xor_bitmap, flags);
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}
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return 0;
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}
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char *midx_bitmap_filename(struct multi_pack_index *midx)
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{
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return xstrfmt("%s-%s.bitmap",
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get_midx_filename(midx->object_dir),
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hash_to_hex(get_midx_checksum(midx)));
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}
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char *pack_bitmap_filename(struct packed_git *p)
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{
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size_t len;
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if (!strip_suffix(p->pack_name, ".pack", &len))
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BUG("pack_name does not end in .pack");
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return xstrfmt("%.*s.bitmap", (int)len, p->pack_name);
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}
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static int open_midx_bitmap_1(struct bitmap_index *bitmap_git,
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struct multi_pack_index *midx)
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{
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struct stat st;
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char *idx_name = midx_bitmap_filename(midx);
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int fd = git_open(idx_name);
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free(idx_name);
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if (fd < 0)
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return -1;
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if (fstat(fd, &st)) {
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close(fd);
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return -1;
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}
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if (bitmap_git->pack || bitmap_git->midx) {
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/* ignore extra bitmap file; we can only handle one */
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warning("ignoring extra bitmap file: %s",
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get_midx_filename(midx->object_dir));
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close(fd);
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return -1;
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}
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bitmap_git->midx = midx;
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bitmap_git->map_size = xsize_t(st.st_size);
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bitmap_git->map_pos = 0;
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bitmap_git->map = xmmap(NULL, bitmap_git->map_size, PROT_READ,
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MAP_PRIVATE, fd, 0);
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close(fd);
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if (load_bitmap_header(bitmap_git) < 0)
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goto cleanup;
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if (!hasheq(get_midx_checksum(bitmap_git->midx), bitmap_git->checksum))
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goto cleanup;
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if (load_midx_revindex(bitmap_git->midx) < 0) {
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warning(_("multi-pack bitmap is missing required reverse index"));
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goto cleanup;
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}
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return 0;
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cleanup:
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munmap(bitmap_git->map, bitmap_git->map_size);
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bitmap_git->map_size = 0;
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bitmap_git->map = NULL;
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return -1;
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}
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static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git *packfile)
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{
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int fd;
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struct stat st;
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char *idx_name;
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if (open_pack_index(packfile))
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return -1;
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idx_name = pack_bitmap_filename(packfile);
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fd = git_open(idx_name);
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free(idx_name);
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if (fd < 0)
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return -1;
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if (fstat(fd, &st)) {
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close(fd);
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return -1;
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}
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if (bitmap_git->pack || bitmap_git->midx) {
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/* ignore extra bitmap file; we can only handle one */
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warning("ignoring extra bitmap file: %s", packfile->pack_name);
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close(fd);
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return -1;
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}
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if (!is_pack_valid(packfile)) {
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close(fd);
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return -1;
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}
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bitmap_git->pack = packfile;
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bitmap_git->map_size = xsize_t(st.st_size);
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bitmap_git->map = xmmap(NULL, bitmap_git->map_size, PROT_READ, MAP_PRIVATE, fd, 0);
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bitmap_git->map_pos = 0;
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close(fd);
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if (load_bitmap_header(bitmap_git) < 0) {
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munmap(bitmap_git->map, bitmap_git->map_size);
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bitmap_git->map = NULL;
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bitmap_git->map_size = 0;
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return -1;
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}
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return 0;
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}
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static int load_reverse_index(struct bitmap_index *bitmap_git)
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{
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if (bitmap_is_midx(bitmap_git)) {
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uint32_t i;
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int ret;
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/*
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* The multi-pack-index's .rev file is already loaded via
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* open_pack_bitmap_1().
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*
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* But we still need to open the individual pack .rev files,
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* since we will need to make use of them in pack-objects.
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*/
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for (i = 0; i < bitmap_git->midx->num_packs; i++) {
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if (prepare_midx_pack(the_repository, bitmap_git->midx, i))
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die(_("load_reverse_index: could not open pack"));
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ret = load_pack_revindex(bitmap_git->midx->packs[i]);
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if (ret)
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return ret;
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}
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return 0;
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}
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return load_pack_revindex(bitmap_git->pack);
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}
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static int load_bitmap(struct bitmap_index *bitmap_git)
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{
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assert(bitmap_git->map);
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bitmap_git->bitmaps = kh_init_oid_map();
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bitmap_git->ext_index.positions = kh_init_oid_pos();
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if (load_reverse_index(bitmap_git))
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goto failed;
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if (!(bitmap_git->commits = read_bitmap_1(bitmap_git)) ||
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!(bitmap_git->trees = read_bitmap_1(bitmap_git)) ||
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!(bitmap_git->blobs = read_bitmap_1(bitmap_git)) ||
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!(bitmap_git->tags = read_bitmap_1(bitmap_git)))
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goto failed;
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if (load_bitmap_entries_v1(bitmap_git) < 0)
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goto failed;
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return 0;
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failed:
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munmap(bitmap_git->map, bitmap_git->map_size);
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bitmap_git->map = NULL;
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bitmap_git->map_size = 0;
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kh_destroy_oid_map(bitmap_git->bitmaps);
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bitmap_git->bitmaps = NULL;
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kh_destroy_oid_pos(bitmap_git->ext_index.positions);
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bitmap_git->ext_index.positions = NULL;
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return -1;
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}
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static int open_pack_bitmap(struct repository *r,
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struct bitmap_index *bitmap_git)
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{
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struct packed_git *p;
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int ret = -1;
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assert(!bitmap_git->map);
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for (p = get_all_packs(r); p; p = p->next) {
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if (open_pack_bitmap_1(bitmap_git, p) == 0)
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ret = 0;
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}
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return ret;
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}
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static int open_midx_bitmap(struct repository *r,
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struct bitmap_index *bitmap_git)
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{
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struct multi_pack_index *midx;
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assert(!bitmap_git->map);
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|
for (midx = get_multi_pack_index(r); midx; midx = midx->next) {
|
|
if (!open_midx_bitmap_1(bitmap_git, midx))
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int open_bitmap(struct repository *r,
|
|
struct bitmap_index *bitmap_git)
|
|
{
|
|
assert(!bitmap_git->map);
|
|
|
|
if (!open_midx_bitmap(r, bitmap_git))
|
|
return 0;
|
|
return open_pack_bitmap(r, bitmap_git);
|
|
}
|
|
|
|
struct bitmap_index *prepare_bitmap_git(struct repository *r)
|
|
{
|
|
struct bitmap_index *bitmap_git = xcalloc(1, sizeof(*bitmap_git));
|
|
|
|
if (!open_bitmap(r, bitmap_git) && !load_bitmap(bitmap_git))
|
|
return bitmap_git;
|
|
|
|
free_bitmap_index(bitmap_git);
|
|
return NULL;
|
|
}
|
|
|
|
struct bitmap_index *prepare_midx_bitmap_git(struct multi_pack_index *midx)
|
|
{
|
|
struct bitmap_index *bitmap_git = xcalloc(1, sizeof(*bitmap_git));
|
|
|
|
if (!open_midx_bitmap_1(bitmap_git, midx) && !load_bitmap(bitmap_git))
|
|
return bitmap_git;
|
|
|
|
free_bitmap_index(bitmap_git);
|
|
return NULL;
|
|
}
|
|
|
|
struct include_data {
|
|
struct bitmap_index *bitmap_git;
|
|
struct bitmap *base;
|
|
struct bitmap *seen;
|
|
};
|
|
|
|
struct ewah_bitmap *bitmap_for_commit(struct bitmap_index *bitmap_git,
|
|
struct commit *commit)
|
|
{
|
|
khiter_t hash_pos = kh_get_oid_map(bitmap_git->bitmaps,
|
|
commit->object.oid);
|
|
if (hash_pos >= kh_end(bitmap_git->bitmaps))
|
|
return NULL;
|
|
return lookup_stored_bitmap(kh_value(bitmap_git->bitmaps, hash_pos));
|
|
}
|
|
|
|
static inline int bitmap_position_extended(struct bitmap_index *bitmap_git,
|
|
const struct object_id *oid)
|
|
{
|
|
kh_oid_pos_t *positions = bitmap_git->ext_index.positions;
|
|
khiter_t pos = kh_get_oid_pos(positions, *oid);
|
|
|
|
if (pos < kh_end(positions)) {
|
|
int bitmap_pos = kh_value(positions, pos);
|
|
return bitmap_pos + bitmap_num_objects(bitmap_git);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static inline int bitmap_position_packfile(struct bitmap_index *bitmap_git,
|
|
const struct object_id *oid)
|
|
{
|
|
uint32_t pos;
|
|
off_t offset = find_pack_entry_one(oid->hash, bitmap_git->pack);
|
|
if (!offset)
|
|
return -1;
|
|
|
|
if (offset_to_pack_pos(bitmap_git->pack, offset, &pos) < 0)
|
|
return -1;
|
|
return pos;
|
|
}
|
|
|
|
static int bitmap_position_midx(struct bitmap_index *bitmap_git,
|
|
const struct object_id *oid)
|
|
{
|
|
uint32_t want, got;
|
|
if (!bsearch_midx(oid, bitmap_git->midx, &want))
|
|
return -1;
|
|
|
|
if (midx_to_pack_pos(bitmap_git->midx, want, &got) < 0)
|
|
return -1;
|
|
return got;
|
|
}
|
|
|
|
static int bitmap_position(struct bitmap_index *bitmap_git,
|
|
const struct object_id *oid)
|
|
{
|
|
int pos;
|
|
if (bitmap_is_midx(bitmap_git))
|
|
pos = bitmap_position_midx(bitmap_git, oid);
|
|
else
|
|
pos = bitmap_position_packfile(bitmap_git, oid);
|
|
return (pos >= 0) ? pos : bitmap_position_extended(bitmap_git, oid);
|
|
}
|
|
|
|
static int ext_index_add_object(struct bitmap_index *bitmap_git,
|
|
struct object *object, const char *name)
|
|
{
|
|
struct eindex *eindex = &bitmap_git->ext_index;
|
|
|
|
khiter_t hash_pos;
|
|
int hash_ret;
|
|
int bitmap_pos;
|
|
|
|
hash_pos = kh_put_oid_pos(eindex->positions, object->oid, &hash_ret);
|
|
if (hash_ret > 0) {
|
|
if (eindex->count >= eindex->alloc) {
|
|
eindex->alloc = (eindex->alloc + 16) * 3 / 2;
|
|
REALLOC_ARRAY(eindex->objects, eindex->alloc);
|
|
REALLOC_ARRAY(eindex->hashes, eindex->alloc);
|
|
}
|
|
|
|
bitmap_pos = eindex->count;
|
|
eindex->objects[eindex->count] = object;
|
|
eindex->hashes[eindex->count] = pack_name_hash(name);
|
|
kh_value(eindex->positions, hash_pos) = bitmap_pos;
|
|
eindex->count++;
|
|
} else {
|
|
bitmap_pos = kh_value(eindex->positions, hash_pos);
|
|
}
|
|
|
|
return bitmap_pos + bitmap_num_objects(bitmap_git);
|
|
}
|
|
|
|
struct bitmap_show_data {
|
|
struct bitmap_index *bitmap_git;
|
|
struct bitmap *base;
|
|
};
|
|
|
|
static void show_object(struct object *object, const char *name, void *data_)
|
|
{
|
|
struct bitmap_show_data *data = data_;
|
|
int bitmap_pos;
|
|
|
|
bitmap_pos = bitmap_position(data->bitmap_git, &object->oid);
|
|
|
|
if (bitmap_pos < 0)
|
|
bitmap_pos = ext_index_add_object(data->bitmap_git, object,
|
|
name);
|
|
|
|
bitmap_set(data->base, bitmap_pos);
|
|
}
|
|
|
|
static void show_commit(struct commit *commit, void *data)
|
|
{
|
|
}
|
|
|
|
static int add_to_include_set(struct bitmap_index *bitmap_git,
|
|
struct include_data *data,
|
|
struct commit *commit,
|
|
int bitmap_pos)
|
|
{
|
|
struct ewah_bitmap *partial;
|
|
|
|
if (data->seen && bitmap_get(data->seen, bitmap_pos))
|
|
return 0;
|
|
|
|
if (bitmap_get(data->base, bitmap_pos))
|
|
return 0;
|
|
|
|
partial = bitmap_for_commit(bitmap_git, commit);
|
|
if (partial) {
|
|
bitmap_or_ewah(data->base, partial);
|
|
return 0;
|
|
}
|
|
|
|
bitmap_set(data->base, bitmap_pos);
|
|
return 1;
|
|
}
|
|
|
|
static int should_include(struct commit *commit, void *_data)
|
|
{
|
|
struct include_data *data = _data;
|
|
int bitmap_pos;
|
|
|
|
bitmap_pos = bitmap_position(data->bitmap_git, &commit->object.oid);
|
|
if (bitmap_pos < 0)
|
|
bitmap_pos = ext_index_add_object(data->bitmap_git,
|
|
(struct object *)commit,
|
|
NULL);
|
|
|
|
if (!add_to_include_set(data->bitmap_git, data, commit, bitmap_pos)) {
|
|
struct commit_list *parent = commit->parents;
|
|
|
|
while (parent) {
|
|
parent->item->object.flags |= SEEN;
|
|
parent = parent->next;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int should_include_obj(struct object *obj, void *_data)
|
|
{
|
|
struct include_data *data = _data;
|
|
int bitmap_pos;
|
|
|
|
bitmap_pos = bitmap_position(data->bitmap_git, &obj->oid);
|
|
if (bitmap_pos < 0)
|
|
return 1;
|
|
if ((data->seen && bitmap_get(data->seen, bitmap_pos)) ||
|
|
bitmap_get(data->base, bitmap_pos)) {
|
|
obj->flags |= SEEN;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int add_commit_to_bitmap(struct bitmap_index *bitmap_git,
|
|
struct bitmap **base,
|
|
struct commit *commit)
|
|
{
|
|
struct ewah_bitmap *or_with = bitmap_for_commit(bitmap_git, commit);
|
|
|
|
if (!or_with)
|
|
return 0;
|
|
|
|
if (*base == NULL)
|
|
*base = ewah_to_bitmap(or_with);
|
|
else
|
|
bitmap_or_ewah(*base, or_with);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static struct bitmap *find_objects(struct bitmap_index *bitmap_git,
|
|
struct rev_info *revs,
|
|
struct object_list *roots,
|
|
struct bitmap *seen,
|
|
struct list_objects_filter_options *filter)
|
|
{
|
|
struct bitmap *base = NULL;
|
|
int needs_walk = 0;
|
|
|
|
struct object_list *not_mapped = NULL;
|
|
|
|
/*
|
|
* Go through all the roots for the walk. The ones that have bitmaps
|
|
* on the bitmap index will be `or`ed together to form an initial
|
|
* global reachability analysis.
|
|
*
|
|
* The ones without bitmaps in the index will be stored in the
|
|
* `not_mapped_list` for further processing.
|
|
*/
|
|
while (roots) {
|
|
struct object *object = roots->item;
|
|
roots = roots->next;
|
|
|
|
if (object->type == OBJ_COMMIT &&
|
|
add_commit_to_bitmap(bitmap_git, &base, (struct commit *)object)) {
|
|
object->flags |= SEEN;
|
|
continue;
|
|
}
|
|
|
|
object_list_insert(object, ¬_mapped);
|
|
}
|
|
|
|
/*
|
|
* Best case scenario: We found bitmaps for all the roots,
|
|
* so the resulting `or` bitmap has the full reachability analysis
|
|
*/
|
|
if (not_mapped == NULL)
|
|
return base;
|
|
|
|
roots = not_mapped;
|
|
|
|
/*
|
|
* Let's iterate through all the roots that don't have bitmaps to
|
|
* check if we can determine them to be reachable from the existing
|
|
* global bitmap.
|
|
*
|
|
* If we cannot find them in the existing global bitmap, we'll need
|
|
* to push them to an actual walk and run it until we can confirm
|
|
* they are reachable
|
|
*/
|
|
while (roots) {
|
|
struct object *object = roots->item;
|
|
int pos;
|
|
|
|
roots = roots->next;
|
|
pos = bitmap_position(bitmap_git, &object->oid);
|
|
|
|
if (pos < 0 || base == NULL || !bitmap_get(base, pos)) {
|
|
object->flags &= ~UNINTERESTING;
|
|
add_pending_object(revs, object, "");
|
|
needs_walk = 1;
|
|
} else {
|
|
object->flags |= SEEN;
|
|
}
|
|
}
|
|
|
|
if (needs_walk) {
|
|
struct include_data incdata;
|
|
struct bitmap_show_data show_data;
|
|
|
|
if (base == NULL)
|
|
base = bitmap_new();
|
|
|
|
incdata.bitmap_git = bitmap_git;
|
|
incdata.base = base;
|
|
incdata.seen = seen;
|
|
|
|
revs->include_check = should_include;
|
|
revs->include_check_obj = should_include_obj;
|
|
revs->include_check_data = &incdata;
|
|
|
|
if (prepare_revision_walk(revs))
|
|
die("revision walk setup failed");
|
|
|
|
show_data.bitmap_git = bitmap_git;
|
|
show_data.base = base;
|
|
|
|
traverse_commit_list_filtered(filter, revs,
|
|
show_commit, show_object,
|
|
&show_data, NULL);
|
|
|
|
revs->include_check = NULL;
|
|
revs->include_check_obj = NULL;
|
|
revs->include_check_data = NULL;
|
|
}
|
|
|
|
return base;
|
|
}
|
|
|
|
static void show_extended_objects(struct bitmap_index *bitmap_git,
|
|
struct rev_info *revs,
|
|
show_reachable_fn show_reach)
|
|
{
|
|
struct bitmap *objects = bitmap_git->result;
|
|
struct eindex *eindex = &bitmap_git->ext_index;
|
|
uint32_t i;
|
|
|
|
for (i = 0; i < eindex->count; ++i) {
|
|
struct object *obj;
|
|
|
|
if (!bitmap_get(objects, bitmap_num_objects(bitmap_git) + i))
|
|
continue;
|
|
|
|
obj = eindex->objects[i];
|
|
if ((obj->type == OBJ_BLOB && !revs->blob_objects) ||
|
|
(obj->type == OBJ_TREE && !revs->tree_objects) ||
|
|
(obj->type == OBJ_TAG && !revs->tag_objects))
|
|
continue;
|
|
|
|
show_reach(&obj->oid, obj->type, 0, eindex->hashes[i], NULL, 0);
|
|
}
|
|
}
|
|
|
|
static void init_type_iterator(struct ewah_iterator *it,
|
|
struct bitmap_index *bitmap_git,
|
|
enum object_type type)
|
|
{
|
|
switch (type) {
|
|
case OBJ_COMMIT:
|
|
ewah_iterator_init(it, bitmap_git->commits);
|
|
break;
|
|
|
|
case OBJ_TREE:
|
|
ewah_iterator_init(it, bitmap_git->trees);
|
|
break;
|
|
|
|
case OBJ_BLOB:
|
|
ewah_iterator_init(it, bitmap_git->blobs);
|
|
break;
|
|
|
|
case OBJ_TAG:
|
|
ewah_iterator_init(it, bitmap_git->tags);
|
|
break;
|
|
|
|
default:
|
|
BUG("object type %d not stored by bitmap type index", type);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void show_objects_for_type(
|
|
struct bitmap_index *bitmap_git,
|
|
enum object_type object_type,
|
|
show_reachable_fn show_reach)
|
|
{
|
|
size_t i = 0;
|
|
uint32_t offset;
|
|
|
|
struct ewah_iterator it;
|
|
eword_t filter;
|
|
|
|
struct bitmap *objects = bitmap_git->result;
|
|
|
|
init_type_iterator(&it, bitmap_git, object_type);
|
|
|
|
for (i = 0; i < objects->word_alloc &&
|
|
ewah_iterator_next(&filter, &it); i++) {
|
|
eword_t word = objects->words[i] & filter;
|
|
size_t pos = (i * BITS_IN_EWORD);
|
|
|
|
if (!word)
|
|
continue;
|
|
|
|
for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
|
|
struct packed_git *pack;
|
|
struct object_id oid;
|
|
uint32_t hash = 0, index_pos;
|
|
off_t ofs;
|
|
|
|
if ((word >> offset) == 0)
|
|
break;
|
|
|
|
offset += ewah_bit_ctz64(word >> offset);
|
|
|
|
if (bitmap_is_midx(bitmap_git)) {
|
|
struct multi_pack_index *m = bitmap_git->midx;
|
|
uint32_t pack_id;
|
|
|
|
index_pos = pack_pos_to_midx(m, pos + offset);
|
|
ofs = nth_midxed_offset(m, index_pos);
|
|
nth_midxed_object_oid(&oid, m, index_pos);
|
|
|
|
pack_id = nth_midxed_pack_int_id(m, index_pos);
|
|
pack = bitmap_git->midx->packs[pack_id];
|
|
} else {
|
|
index_pos = pack_pos_to_index(bitmap_git->pack, pos + offset);
|
|
ofs = pack_pos_to_offset(bitmap_git->pack, pos + offset);
|
|
nth_bitmap_object_oid(bitmap_git, &oid, index_pos);
|
|
|
|
pack = bitmap_git->pack;
|
|
}
|
|
|
|
if (bitmap_git->hashes)
|
|
hash = get_be32(bitmap_git->hashes + index_pos);
|
|
|
|
show_reach(&oid, object_type, 0, hash, pack, ofs);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int in_bitmapped_pack(struct bitmap_index *bitmap_git,
|
|
struct object_list *roots)
|
|
{
|
|
while (roots) {
|
|
struct object *object = roots->item;
|
|
roots = roots->next;
|
|
|
|
if (bitmap_is_midx(bitmap_git)) {
|
|
if (bsearch_midx(&object->oid, bitmap_git->midx, NULL))
|
|
return 1;
|
|
} else {
|
|
if (find_pack_entry_one(object->oid.hash, bitmap_git->pack) > 0)
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct bitmap *find_tip_objects(struct bitmap_index *bitmap_git,
|
|
struct object_list *tip_objects,
|
|
enum object_type type)
|
|
{
|
|
struct bitmap *result = bitmap_new();
|
|
struct object_list *p;
|
|
|
|
for (p = tip_objects; p; p = p->next) {
|
|
int pos;
|
|
|
|
if (p->item->type != type)
|
|
continue;
|
|
|
|
pos = bitmap_position(bitmap_git, &p->item->oid);
|
|
if (pos < 0)
|
|
continue;
|
|
|
|
bitmap_set(result, pos);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static void filter_bitmap_exclude_type(struct bitmap_index *bitmap_git,
|
|
struct object_list *tip_objects,
|
|
struct bitmap *to_filter,
|
|
enum object_type type)
|
|
{
|
|
struct eindex *eindex = &bitmap_git->ext_index;
|
|
struct bitmap *tips;
|
|
struct ewah_iterator it;
|
|
eword_t mask;
|
|
uint32_t i;
|
|
|
|
/*
|
|
* The non-bitmap version of this filter never removes
|
|
* objects which the other side specifically asked for,
|
|
* so we must match that behavior.
|
|
*/
|
|
tips = find_tip_objects(bitmap_git, tip_objects, type);
|
|
|
|
/*
|
|
* We can use the type-level bitmap for 'type' to work in whole
|
|
* words for the objects that are actually in the bitmapped
|
|
* packfile.
|
|
*/
|
|
for (i = 0, init_type_iterator(&it, bitmap_git, type);
|
|
i < to_filter->word_alloc && ewah_iterator_next(&mask, &it);
|
|
i++) {
|
|
if (i < tips->word_alloc)
|
|
mask &= ~tips->words[i];
|
|
to_filter->words[i] &= ~mask;
|
|
}
|
|
|
|
/*
|
|
* Clear any objects that weren't in the packfile (and so would
|
|
* not have been caught by the loop above. We'll have to check
|
|
* them individually.
|
|
*/
|
|
for (i = 0; i < eindex->count; i++) {
|
|
uint32_t pos = i + bitmap_num_objects(bitmap_git);
|
|
if (eindex->objects[i]->type == type &&
|
|
bitmap_get(to_filter, pos) &&
|
|
!bitmap_get(tips, pos))
|
|
bitmap_unset(to_filter, pos);
|
|
}
|
|
|
|
bitmap_free(tips);
|
|
}
|
|
|
|
static void filter_bitmap_blob_none(struct bitmap_index *bitmap_git,
|
|
struct object_list *tip_objects,
|
|
struct bitmap *to_filter)
|
|
{
|
|
filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
|
|
OBJ_BLOB);
|
|
}
|
|
|
|
static unsigned long get_size_by_pos(struct bitmap_index *bitmap_git,
|
|
uint32_t pos)
|
|
{
|
|
unsigned long size;
|
|
struct object_info oi = OBJECT_INFO_INIT;
|
|
|
|
oi.sizep = &size;
|
|
|
|
if (pos < bitmap_num_objects(bitmap_git)) {
|
|
struct packed_git *pack;
|
|
off_t ofs;
|
|
|
|
if (bitmap_is_midx(bitmap_git)) {
|
|
uint32_t midx_pos = pack_pos_to_midx(bitmap_git->midx, pos);
|
|
uint32_t pack_id = nth_midxed_pack_int_id(bitmap_git->midx, midx_pos);
|
|
|
|
pack = bitmap_git->midx->packs[pack_id];
|
|
ofs = nth_midxed_offset(bitmap_git->midx, midx_pos);
|
|
} else {
|
|
pack = bitmap_git->pack;
|
|
ofs = pack_pos_to_offset(pack, pos);
|
|
}
|
|
|
|
if (packed_object_info(the_repository, pack, ofs, &oi) < 0) {
|
|
struct object_id oid;
|
|
nth_bitmap_object_oid(bitmap_git, &oid,
|
|
pack_pos_to_index(pack, pos));
|
|
die(_("unable to get size of %s"), oid_to_hex(&oid));
|
|
}
|
|
} else {
|
|
struct eindex *eindex = &bitmap_git->ext_index;
|
|
struct object *obj = eindex->objects[pos - bitmap_num_objects(bitmap_git)];
|
|
if (oid_object_info_extended(the_repository, &obj->oid, &oi, 0) < 0)
|
|
die(_("unable to get size of %s"), oid_to_hex(&obj->oid));
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
static void filter_bitmap_blob_limit(struct bitmap_index *bitmap_git,
|
|
struct object_list *tip_objects,
|
|
struct bitmap *to_filter,
|
|
unsigned long limit)
|
|
{
|
|
struct eindex *eindex = &bitmap_git->ext_index;
|
|
struct bitmap *tips;
|
|
struct ewah_iterator it;
|
|
eword_t mask;
|
|
uint32_t i;
|
|
|
|
tips = find_tip_objects(bitmap_git, tip_objects, OBJ_BLOB);
|
|
|
|
for (i = 0, init_type_iterator(&it, bitmap_git, OBJ_BLOB);
|
|
i < to_filter->word_alloc && ewah_iterator_next(&mask, &it);
|
|
i++) {
|
|
eword_t word = to_filter->words[i] & mask;
|
|
unsigned offset;
|
|
|
|
for (offset = 0; offset < BITS_IN_EWORD; offset++) {
|
|
uint32_t pos;
|
|
|
|
if ((word >> offset) == 0)
|
|
break;
|
|
offset += ewah_bit_ctz64(word >> offset);
|
|
pos = i * BITS_IN_EWORD + offset;
|
|
|
|
if (!bitmap_get(tips, pos) &&
|
|
get_size_by_pos(bitmap_git, pos) >= limit)
|
|
bitmap_unset(to_filter, pos);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < eindex->count; i++) {
|
|
uint32_t pos = i + bitmap_num_objects(bitmap_git);
|
|
if (eindex->objects[i]->type == OBJ_BLOB &&
|
|
bitmap_get(to_filter, pos) &&
|
|
!bitmap_get(tips, pos) &&
|
|
get_size_by_pos(bitmap_git, pos) >= limit)
|
|
bitmap_unset(to_filter, pos);
|
|
}
|
|
|
|
bitmap_free(tips);
|
|
}
|
|
|
|
static void filter_bitmap_tree_depth(struct bitmap_index *bitmap_git,
|
|
struct object_list *tip_objects,
|
|
struct bitmap *to_filter,
|
|
unsigned long limit)
|
|
{
|
|
if (limit)
|
|
BUG("filter_bitmap_tree_depth given non-zero limit");
|
|
|
|
filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
|
|
OBJ_TREE);
|
|
filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
|
|
OBJ_BLOB);
|
|
}
|
|
|
|
static void filter_bitmap_object_type(struct bitmap_index *bitmap_git,
|
|
struct object_list *tip_objects,
|
|
struct bitmap *to_filter,
|
|
enum object_type object_type)
|
|
{
|
|
if (object_type < OBJ_COMMIT || object_type > OBJ_TAG)
|
|
BUG("filter_bitmap_object_type given invalid object");
|
|
|
|
if (object_type != OBJ_TAG)
|
|
filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_TAG);
|
|
if (object_type != OBJ_COMMIT)
|
|
filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_COMMIT);
|
|
if (object_type != OBJ_TREE)
|
|
filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_TREE);
|
|
if (object_type != OBJ_BLOB)
|
|
filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter, OBJ_BLOB);
|
|
}
|
|
|
|
static int filter_bitmap(struct bitmap_index *bitmap_git,
|
|
struct object_list *tip_objects,
|
|
struct bitmap *to_filter,
|
|
struct list_objects_filter_options *filter)
|
|
{
|
|
if (!filter || filter->choice == LOFC_DISABLED)
|
|
return 0;
|
|
|
|
if (filter->choice == LOFC_BLOB_NONE) {
|
|
if (bitmap_git)
|
|
filter_bitmap_blob_none(bitmap_git, tip_objects,
|
|
to_filter);
|
|
return 0;
|
|
}
|
|
|
|
if (filter->choice == LOFC_BLOB_LIMIT) {
|
|
if (bitmap_git)
|
|
filter_bitmap_blob_limit(bitmap_git, tip_objects,
|
|
to_filter,
|
|
filter->blob_limit_value);
|
|
return 0;
|
|
}
|
|
|
|
if (filter->choice == LOFC_TREE_DEPTH &&
|
|
filter->tree_exclude_depth == 0) {
|
|
if (bitmap_git)
|
|
filter_bitmap_tree_depth(bitmap_git, tip_objects,
|
|
to_filter,
|
|
filter->tree_exclude_depth);
|
|
return 0;
|
|
}
|
|
|
|
if (filter->choice == LOFC_OBJECT_TYPE) {
|
|
if (bitmap_git)
|
|
filter_bitmap_object_type(bitmap_git, tip_objects,
|
|
to_filter,
|
|
filter->object_type);
|
|
return 0;
|
|
}
|
|
|
|
if (filter->choice == LOFC_COMBINE) {
|
|
int i;
|
|
for (i = 0; i < filter->sub_nr; i++) {
|
|
if (filter_bitmap(bitmap_git, tip_objects, to_filter,
|
|
&filter->sub[i]) < 0)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* filter choice not handled */
|
|
return -1;
|
|
}
|
|
|
|
static int can_filter_bitmap(struct list_objects_filter_options *filter)
|
|
{
|
|
return !filter_bitmap(NULL, NULL, NULL, filter);
|
|
}
|
|
|
|
struct bitmap_index *prepare_bitmap_walk(struct rev_info *revs,
|
|
struct list_objects_filter_options *filter,
|
|
int filter_provided_objects)
|
|
{
|
|
unsigned int i;
|
|
|
|
struct object_list *wants = NULL;
|
|
struct object_list *haves = NULL;
|
|
|
|
struct bitmap *wants_bitmap = NULL;
|
|
struct bitmap *haves_bitmap = NULL;
|
|
|
|
struct bitmap_index *bitmap_git;
|
|
|
|
/*
|
|
* We can't do pathspec limiting with bitmaps, because we don't know
|
|
* which commits are associated with which object changes (let alone
|
|
* even which objects are associated with which paths).
|
|
*/
|
|
if (revs->prune)
|
|
return NULL;
|
|
|
|
if (!can_filter_bitmap(filter))
|
|
return NULL;
|
|
|
|
/* try to open a bitmapped pack, but don't parse it yet
|
|
* because we may not need to use it */
|
|
CALLOC_ARRAY(bitmap_git, 1);
|
|
if (open_bitmap(revs->repo, bitmap_git) < 0)
|
|
goto cleanup;
|
|
|
|
for (i = 0; i < revs->pending.nr; ++i) {
|
|
struct object *object = revs->pending.objects[i].item;
|
|
|
|
if (object->type == OBJ_NONE)
|
|
parse_object_or_die(&object->oid, NULL);
|
|
|
|
while (object->type == OBJ_TAG) {
|
|
struct tag *tag = (struct tag *) object;
|
|
|
|
if (object->flags & UNINTERESTING)
|
|
object_list_insert(object, &haves);
|
|
else
|
|
object_list_insert(object, &wants);
|
|
|
|
object = parse_object_or_die(get_tagged_oid(tag), NULL);
|
|
object->flags |= (tag->object.flags & UNINTERESTING);
|
|
}
|
|
|
|
if (object->flags & UNINTERESTING)
|
|
object_list_insert(object, &haves);
|
|
else
|
|
object_list_insert(object, &wants);
|
|
}
|
|
|
|
/*
|
|
* if we have a HAVES list, but none of those haves is contained
|
|
* in the packfile that has a bitmap, we don't have anything to
|
|
* optimize here
|
|
*/
|
|
if (haves && !in_bitmapped_pack(bitmap_git, haves))
|
|
goto cleanup;
|
|
|
|
/* if we don't want anything, we're done here */
|
|
if (!wants)
|
|
goto cleanup;
|
|
|
|
/*
|
|
* now we're going to use bitmaps, so load the actual bitmap entries
|
|
* from disk. this is the point of no return; after this the rev_list
|
|
* becomes invalidated and we must perform the revwalk through bitmaps
|
|
*/
|
|
if (load_bitmap(bitmap_git) < 0)
|
|
goto cleanup;
|
|
|
|
object_array_clear(&revs->pending);
|
|
|
|
if (haves) {
|
|
revs->ignore_missing_links = 1;
|
|
haves_bitmap = find_objects(bitmap_git, revs, haves, NULL,
|
|
filter);
|
|
reset_revision_walk();
|
|
revs->ignore_missing_links = 0;
|
|
|
|
if (haves_bitmap == NULL)
|
|
BUG("failed to perform bitmap walk");
|
|
}
|
|
|
|
wants_bitmap = find_objects(bitmap_git, revs, wants, haves_bitmap,
|
|
filter);
|
|
|
|
if (!wants_bitmap)
|
|
BUG("failed to perform bitmap walk");
|
|
|
|
if (haves_bitmap)
|
|
bitmap_and_not(wants_bitmap, haves_bitmap);
|
|
|
|
filter_bitmap(bitmap_git, (filter && filter_provided_objects) ? NULL : wants,
|
|
wants_bitmap, filter);
|
|
|
|
bitmap_git->result = wants_bitmap;
|
|
bitmap_git->haves = haves_bitmap;
|
|
|
|
object_list_free(&wants);
|
|
object_list_free(&haves);
|
|
|
|
return bitmap_git;
|
|
|
|
cleanup:
|
|
free_bitmap_index(bitmap_git);
|
|
object_list_free(&wants);
|
|
object_list_free(&haves);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* -1 means "stop trying further objects"; 0 means we may or may not have
|
|
* reused, but you can keep feeding bits.
|
|
*/
|
|
static int try_partial_reuse(struct packed_git *pack,
|
|
size_t pos,
|
|
struct bitmap *reuse,
|
|
struct pack_window **w_curs)
|
|
{
|
|
off_t offset, delta_obj_offset;
|
|
enum object_type type;
|
|
unsigned long size;
|
|
|
|
/*
|
|
* try_partial_reuse() is called either on (a) objects in the
|
|
* bitmapped pack (in the case of a single-pack bitmap) or (b)
|
|
* objects in the preferred pack of a multi-pack bitmap.
|
|
* Importantly, the latter can pretend as if only a single pack
|
|
* exists because:
|
|
*
|
|
* - The first pack->num_objects bits of a MIDX bitmap are
|
|
* reserved for the preferred pack, and
|
|
*
|
|
* - Ties due to duplicate objects are always resolved in
|
|
* favor of the preferred pack.
|
|
*
|
|
* Therefore we do not need to ever ask the MIDX for its copy of
|
|
* an object by OID, since it will always select it from the
|
|
* preferred pack. Likewise, the selected copy of the base
|
|
* object for any deltas will reside in the same pack.
|
|
*
|
|
* This means that we can reuse pos when looking up the bit in
|
|
* the reuse bitmap, too, since bits corresponding to the
|
|
* preferred pack precede all bits from other packs.
|
|
*/
|
|
|
|
if (pos >= pack->num_objects)
|
|
return -1; /* not actually in the pack or MIDX preferred pack */
|
|
|
|
offset = delta_obj_offset = pack_pos_to_offset(pack, pos);
|
|
type = unpack_object_header(pack, w_curs, &offset, &size);
|
|
if (type < 0)
|
|
return -1; /* broken packfile, punt */
|
|
|
|
if (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA) {
|
|
off_t base_offset;
|
|
uint32_t base_pos;
|
|
|
|
/*
|
|
* Find the position of the base object so we can look it up
|
|
* in our bitmaps. If we can't come up with an offset, or if
|
|
* that offset is not in the revidx, the pack is corrupt.
|
|
* There's nothing we can do, so just punt on this object,
|
|
* and the normal slow path will complain about it in
|
|
* more detail.
|
|
*/
|
|
base_offset = get_delta_base(pack, w_curs, &offset, type,
|
|
delta_obj_offset);
|
|
if (!base_offset)
|
|
return 0;
|
|
if (offset_to_pack_pos(pack, base_offset, &base_pos) < 0)
|
|
return 0;
|
|
|
|
/*
|
|
* We assume delta dependencies always point backwards. This
|
|
* lets us do a single pass, and is basically always true
|
|
* due to the way OFS_DELTAs work. You would not typically
|
|
* find REF_DELTA in a bitmapped pack, since we only bitmap
|
|
* packs we write fresh, and OFS_DELTA is the default). But
|
|
* let's double check to make sure the pack wasn't written with
|
|
* odd parameters.
|
|
*/
|
|
if (base_pos >= pos)
|
|
return 0;
|
|
|
|
/*
|
|
* And finally, if we're not sending the base as part of our
|
|
* reuse chunk, then don't send this object either. The base
|
|
* would come after us, along with other objects not
|
|
* necessarily in the pack, which means we'd need to convert
|
|
* to REF_DELTA on the fly. Better to just let the normal
|
|
* object_entry code path handle it.
|
|
*/
|
|
if (!bitmap_get(reuse, base_pos))
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If we got here, then the object is OK to reuse. Mark it.
|
|
*/
|
|
bitmap_set(reuse, pos);
|
|
return 0;
|
|
}
|
|
|
|
static uint32_t midx_preferred_pack(struct bitmap_index *bitmap_git)
|
|
{
|
|
struct multi_pack_index *m = bitmap_git->midx;
|
|
if (!m)
|
|
BUG("midx_preferred_pack: requires non-empty MIDX");
|
|
return nth_midxed_pack_int_id(m, pack_pos_to_midx(bitmap_git->midx, 0));
|
|
}
|
|
|
|
int reuse_partial_packfile_from_bitmap(struct bitmap_index *bitmap_git,
|
|
struct packed_git **packfile_out,
|
|
uint32_t *entries,
|
|
struct bitmap **reuse_out)
|
|
{
|
|
struct packed_git *pack;
|
|
struct bitmap *result = bitmap_git->result;
|
|
struct bitmap *reuse;
|
|
struct pack_window *w_curs = NULL;
|
|
size_t i = 0;
|
|
uint32_t offset;
|
|
uint32_t objects_nr;
|
|
|
|
assert(result);
|
|
|
|
load_reverse_index(bitmap_git);
|
|
|
|
if (bitmap_is_midx(bitmap_git))
|
|
pack = bitmap_git->midx->packs[midx_preferred_pack(bitmap_git)];
|
|
else
|
|
pack = bitmap_git->pack;
|
|
objects_nr = pack->num_objects;
|
|
|
|
while (i < result->word_alloc && result->words[i] == (eword_t)~0)
|
|
i++;
|
|
|
|
/*
|
|
* Don't mark objects not in the packfile or preferred pack. This bitmap
|
|
* marks objects eligible for reuse, but the pack-reuse code only
|
|
* understands how to reuse a single pack. Since the preferred pack is
|
|
* guaranteed to have all bases for its deltas (in a multi-pack bitmap),
|
|
* we use it instead of another pack. In single-pack bitmaps, the choice
|
|
* is made for us.
|
|
*/
|
|
if (i > objects_nr / BITS_IN_EWORD)
|
|
i = objects_nr / BITS_IN_EWORD;
|
|
|
|
reuse = bitmap_word_alloc(i);
|
|
memset(reuse->words, 0xFF, i * sizeof(eword_t));
|
|
|
|
for (; i < result->word_alloc; ++i) {
|
|
eword_t word = result->words[i];
|
|
size_t pos = (i * BITS_IN_EWORD);
|
|
|
|
for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
|
|
if ((word >> offset) == 0)
|
|
break;
|
|
|
|
offset += ewah_bit_ctz64(word >> offset);
|
|
if (try_partial_reuse(pack, pos + offset,
|
|
reuse, &w_curs) < 0) {
|
|
/*
|
|
* try_partial_reuse indicated we couldn't reuse
|
|
* any bits, so there is no point in trying more
|
|
* bits in the current word, or any other words
|
|
* in result.
|
|
*
|
|
* Jump out of both loops to avoid future
|
|
* unnecessary calls to try_partial_reuse.
|
|
*/
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
|
|
done:
|
|
unuse_pack(&w_curs);
|
|
|
|
*entries = bitmap_popcount(reuse);
|
|
if (!*entries) {
|
|
bitmap_free(reuse);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Drop any reused objects from the result, since they will not
|
|
* need to be handled separately.
|
|
*/
|
|
bitmap_and_not(result, reuse);
|
|
*packfile_out = pack;
|
|
*reuse_out = reuse;
|
|
return 0;
|
|
}
|
|
|
|
int bitmap_walk_contains(struct bitmap_index *bitmap_git,
|
|
struct bitmap *bitmap, const struct object_id *oid)
|
|
{
|
|
int idx;
|
|
|
|
if (!bitmap)
|
|
return 0;
|
|
|
|
idx = bitmap_position(bitmap_git, oid);
|
|
return idx >= 0 && bitmap_get(bitmap, idx);
|
|
}
|
|
|
|
void traverse_bitmap_commit_list(struct bitmap_index *bitmap_git,
|
|
struct rev_info *revs,
|
|
show_reachable_fn show_reachable)
|
|
{
|
|
assert(bitmap_git->result);
|
|
|
|
show_objects_for_type(bitmap_git, OBJ_COMMIT, show_reachable);
|
|
if (revs->tree_objects)
|
|
show_objects_for_type(bitmap_git, OBJ_TREE, show_reachable);
|
|
if (revs->blob_objects)
|
|
show_objects_for_type(bitmap_git, OBJ_BLOB, show_reachable);
|
|
if (revs->tag_objects)
|
|
show_objects_for_type(bitmap_git, OBJ_TAG, show_reachable);
|
|
|
|
show_extended_objects(bitmap_git, revs, show_reachable);
|
|
}
|
|
|
|
static uint32_t count_object_type(struct bitmap_index *bitmap_git,
|
|
enum object_type type)
|
|
{
|
|
struct bitmap *objects = bitmap_git->result;
|
|
struct eindex *eindex = &bitmap_git->ext_index;
|
|
|
|
uint32_t i = 0, count = 0;
|
|
struct ewah_iterator it;
|
|
eword_t filter;
|
|
|
|
init_type_iterator(&it, bitmap_git, type);
|
|
|
|
while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) {
|
|
eword_t word = objects->words[i++] & filter;
|
|
count += ewah_bit_popcount64(word);
|
|
}
|
|
|
|
for (i = 0; i < eindex->count; ++i) {
|
|
if (eindex->objects[i]->type == type &&
|
|
bitmap_get(objects, bitmap_num_objects(bitmap_git) + i))
|
|
count++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
void count_bitmap_commit_list(struct bitmap_index *bitmap_git,
|
|
uint32_t *commits, uint32_t *trees,
|
|
uint32_t *blobs, uint32_t *tags)
|
|
{
|
|
assert(bitmap_git->result);
|
|
|
|
if (commits)
|
|
*commits = count_object_type(bitmap_git, OBJ_COMMIT);
|
|
|
|
if (trees)
|
|
*trees = count_object_type(bitmap_git, OBJ_TREE);
|
|
|
|
if (blobs)
|
|
*blobs = count_object_type(bitmap_git, OBJ_BLOB);
|
|
|
|
if (tags)
|
|
*tags = count_object_type(bitmap_git, OBJ_TAG);
|
|
}
|
|
|
|
struct bitmap_test_data {
|
|
struct bitmap_index *bitmap_git;
|
|
struct bitmap *base;
|
|
struct bitmap *commits;
|
|
struct bitmap *trees;
|
|
struct bitmap *blobs;
|
|
struct bitmap *tags;
|
|
struct progress *prg;
|
|
size_t seen;
|
|
};
|
|
|
|
static void test_bitmap_type(struct bitmap_test_data *tdata,
|
|
struct object *obj, int pos)
|
|
{
|
|
enum object_type bitmap_type = OBJ_NONE;
|
|
int bitmaps_nr = 0;
|
|
|
|
if (bitmap_get(tdata->commits, pos)) {
|
|
bitmap_type = OBJ_COMMIT;
|
|
bitmaps_nr++;
|
|
}
|
|
if (bitmap_get(tdata->trees, pos)) {
|
|
bitmap_type = OBJ_TREE;
|
|
bitmaps_nr++;
|
|
}
|
|
if (bitmap_get(tdata->blobs, pos)) {
|
|
bitmap_type = OBJ_BLOB;
|
|
bitmaps_nr++;
|
|
}
|
|
if (bitmap_get(tdata->tags, pos)) {
|
|
bitmap_type = OBJ_TAG;
|
|
bitmaps_nr++;
|
|
}
|
|
|
|
if (bitmap_type == OBJ_NONE)
|
|
die("object %s not found in type bitmaps",
|
|
oid_to_hex(&obj->oid));
|
|
|
|
if (bitmaps_nr > 1)
|
|
die("object %s does not have a unique type",
|
|
oid_to_hex(&obj->oid));
|
|
|
|
if (bitmap_type != obj->type)
|
|
die("object %s: real type %s, expected: %s",
|
|
oid_to_hex(&obj->oid),
|
|
type_name(obj->type),
|
|
type_name(bitmap_type));
|
|
}
|
|
|
|
static void test_show_object(struct object *object, const char *name,
|
|
void *data)
|
|
{
|
|
struct bitmap_test_data *tdata = data;
|
|
int bitmap_pos;
|
|
|
|
bitmap_pos = bitmap_position(tdata->bitmap_git, &object->oid);
|
|
if (bitmap_pos < 0)
|
|
die("Object not in bitmap: %s\n", oid_to_hex(&object->oid));
|
|
test_bitmap_type(tdata, object, bitmap_pos);
|
|
|
|
bitmap_set(tdata->base, bitmap_pos);
|
|
display_progress(tdata->prg, ++tdata->seen);
|
|
}
|
|
|
|
static void test_show_commit(struct commit *commit, void *data)
|
|
{
|
|
struct bitmap_test_data *tdata = data;
|
|
int bitmap_pos;
|
|
|
|
bitmap_pos = bitmap_position(tdata->bitmap_git,
|
|
&commit->object.oid);
|
|
if (bitmap_pos < 0)
|
|
die("Object not in bitmap: %s\n", oid_to_hex(&commit->object.oid));
|
|
test_bitmap_type(tdata, &commit->object, bitmap_pos);
|
|
|
|
bitmap_set(tdata->base, bitmap_pos);
|
|
display_progress(tdata->prg, ++tdata->seen);
|
|
}
|
|
|
|
void test_bitmap_walk(struct rev_info *revs)
|
|
{
|
|
struct object *root;
|
|
struct bitmap *result = NULL;
|
|
size_t result_popcnt;
|
|
struct bitmap_test_data tdata;
|
|
struct bitmap_index *bitmap_git;
|
|
struct ewah_bitmap *bm;
|
|
|
|
if (!(bitmap_git = prepare_bitmap_git(revs->repo)))
|
|
die("failed to load bitmap indexes");
|
|
|
|
if (revs->pending.nr != 1)
|
|
die("you must specify exactly one commit to test");
|
|
|
|
fprintf(stderr, "Bitmap v%d test (%d entries loaded)\n",
|
|
bitmap_git->version, bitmap_git->entry_count);
|
|
|
|
root = revs->pending.objects[0].item;
|
|
bm = bitmap_for_commit(bitmap_git, (struct commit *)root);
|
|
|
|
if (bm) {
|
|
fprintf(stderr, "Found bitmap for %s. %d bits / %08x checksum\n",
|
|
oid_to_hex(&root->oid), (int)bm->bit_size, ewah_checksum(bm));
|
|
|
|
result = ewah_to_bitmap(bm);
|
|
}
|
|
|
|
if (result == NULL)
|
|
die("Commit %s doesn't have an indexed bitmap", oid_to_hex(&root->oid));
|
|
|
|
revs->tag_objects = 1;
|
|
revs->tree_objects = 1;
|
|
revs->blob_objects = 1;
|
|
|
|
result_popcnt = bitmap_popcount(result);
|
|
|
|
if (prepare_revision_walk(revs))
|
|
die("revision walk setup failed");
|
|
|
|
tdata.bitmap_git = bitmap_git;
|
|
tdata.base = bitmap_new();
|
|
tdata.commits = ewah_to_bitmap(bitmap_git->commits);
|
|
tdata.trees = ewah_to_bitmap(bitmap_git->trees);
|
|
tdata.blobs = ewah_to_bitmap(bitmap_git->blobs);
|
|
tdata.tags = ewah_to_bitmap(bitmap_git->tags);
|
|
tdata.prg = start_progress("Verifying bitmap entries", result_popcnt);
|
|
tdata.seen = 0;
|
|
|
|
traverse_commit_list(revs, &test_show_commit, &test_show_object, &tdata);
|
|
|
|
stop_progress(&tdata.prg);
|
|
|
|
if (bitmap_equals(result, tdata.base))
|
|
fprintf(stderr, "OK!\n");
|
|
else
|
|
die("mismatch in bitmap results");
|
|
|
|
free_bitmap_index(bitmap_git);
|
|
}
|
|
|
|
int test_bitmap_commits(struct repository *r)
|
|
{
|
|
struct bitmap_index *bitmap_git = prepare_bitmap_git(r);
|
|
struct object_id oid;
|
|
MAYBE_UNUSED void *value;
|
|
|
|
if (!bitmap_git)
|
|
die("failed to load bitmap indexes");
|
|
|
|
kh_foreach(bitmap_git->bitmaps, oid, value, {
|
|
printf("%s\n", oid_to_hex(&oid));
|
|
});
|
|
|
|
free_bitmap_index(bitmap_git);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int test_bitmap_hashes(struct repository *r)
|
|
{
|
|
struct bitmap_index *bitmap_git = prepare_bitmap_git(r);
|
|
struct object_id oid;
|
|
uint32_t i, index_pos;
|
|
|
|
if (!bitmap_git->hashes)
|
|
goto cleanup;
|
|
|
|
for (i = 0; i < bitmap_num_objects(bitmap_git); i++) {
|
|
if (bitmap_is_midx(bitmap_git))
|
|
index_pos = pack_pos_to_midx(bitmap_git->midx, i);
|
|
else
|
|
index_pos = pack_pos_to_index(bitmap_git->pack, i);
|
|
|
|
nth_bitmap_object_oid(bitmap_git, &oid, index_pos);
|
|
|
|
printf("%s %"PRIu32"\n",
|
|
oid_to_hex(&oid), get_be32(bitmap_git->hashes + index_pos));
|
|
}
|
|
|
|
cleanup:
|
|
free_bitmap_index(bitmap_git);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int rebuild_bitmap(const uint32_t *reposition,
|
|
struct ewah_bitmap *source,
|
|
struct bitmap *dest)
|
|
{
|
|
uint32_t pos = 0;
|
|
struct ewah_iterator it;
|
|
eword_t word;
|
|
|
|
ewah_iterator_init(&it, source);
|
|
|
|
while (ewah_iterator_next(&word, &it)) {
|
|
uint32_t offset, bit_pos;
|
|
|
|
for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
|
|
if ((word >> offset) == 0)
|
|
break;
|
|
|
|
offset += ewah_bit_ctz64(word >> offset);
|
|
|
|
bit_pos = reposition[pos + offset];
|
|
if (bit_pos > 0)
|
|
bitmap_set(dest, bit_pos - 1);
|
|
else /* can't reuse, we don't have the object */
|
|
return -1;
|
|
}
|
|
|
|
pos += BITS_IN_EWORD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
uint32_t *create_bitmap_mapping(struct bitmap_index *bitmap_git,
|
|
struct packing_data *mapping)
|
|
{
|
|
uint32_t i, num_objects;
|
|
uint32_t *reposition;
|
|
|
|
if (!bitmap_is_midx(bitmap_git))
|
|
load_reverse_index(bitmap_git);
|
|
else if (load_midx_revindex(bitmap_git->midx) < 0)
|
|
BUG("rebuild_existing_bitmaps: missing required rev-cache "
|
|
"extension");
|
|
|
|
num_objects = bitmap_num_objects(bitmap_git);
|
|
CALLOC_ARRAY(reposition, num_objects);
|
|
|
|
for (i = 0; i < num_objects; ++i) {
|
|
struct object_id oid;
|
|
struct object_entry *oe;
|
|
uint32_t index_pos;
|
|
|
|
if (bitmap_is_midx(bitmap_git))
|
|
index_pos = pack_pos_to_midx(bitmap_git->midx, i);
|
|
else
|
|
index_pos = pack_pos_to_index(bitmap_git->pack, i);
|
|
nth_bitmap_object_oid(bitmap_git, &oid, index_pos);
|
|
oe = packlist_find(mapping, &oid);
|
|
|
|
if (oe) {
|
|
reposition[i] = oe_in_pack_pos(mapping, oe) + 1;
|
|
if (bitmap_git->hashes && !oe->hash)
|
|
oe->hash = get_be32(bitmap_git->hashes + index_pos);
|
|
}
|
|
}
|
|
|
|
return reposition;
|
|
}
|
|
|
|
void free_bitmap_index(struct bitmap_index *b)
|
|
{
|
|
if (!b)
|
|
return;
|
|
|
|
if (b->map)
|
|
munmap(b->map, b->map_size);
|
|
ewah_pool_free(b->commits);
|
|
ewah_pool_free(b->trees);
|
|
ewah_pool_free(b->blobs);
|
|
ewah_pool_free(b->tags);
|
|
kh_destroy_oid_map(b->bitmaps);
|
|
free(b->ext_index.objects);
|
|
free(b->ext_index.hashes);
|
|
bitmap_free(b->result);
|
|
bitmap_free(b->haves);
|
|
if (bitmap_is_midx(b)) {
|
|
/*
|
|
* Multi-pack bitmaps need to have resources associated with
|
|
* their on-disk reverse indexes unmapped so that stale .rev and
|
|
* .bitmap files can be removed.
|
|
*
|
|
* Unlike pack-based bitmaps, multi-pack bitmaps can be read and
|
|
* written in the same 'git multi-pack-index write --bitmap'
|
|
* process. Close resources so they can be removed safely on
|
|
* platforms like Windows.
|
|
*/
|
|
close_midx_revindex(b->midx);
|
|
}
|
|
free(b);
|
|
}
|
|
|
|
int bitmap_has_oid_in_uninteresting(struct bitmap_index *bitmap_git,
|
|
const struct object_id *oid)
|
|
{
|
|
return bitmap_git &&
|
|
bitmap_walk_contains(bitmap_git, bitmap_git->haves, oid);
|
|
}
|
|
|
|
static off_t get_disk_usage_for_type(struct bitmap_index *bitmap_git,
|
|
enum object_type object_type)
|
|
{
|
|
struct bitmap *result = bitmap_git->result;
|
|
off_t total = 0;
|
|
struct ewah_iterator it;
|
|
eword_t filter;
|
|
size_t i;
|
|
|
|
init_type_iterator(&it, bitmap_git, object_type);
|
|
for (i = 0; i < result->word_alloc &&
|
|
ewah_iterator_next(&filter, &it); i++) {
|
|
eword_t word = result->words[i] & filter;
|
|
size_t base = (i * BITS_IN_EWORD);
|
|
unsigned offset;
|
|
|
|
if (!word)
|
|
continue;
|
|
|
|
for (offset = 0; offset < BITS_IN_EWORD; offset++) {
|
|
if ((word >> offset) == 0)
|
|
break;
|
|
|
|
offset += ewah_bit_ctz64(word >> offset);
|
|
|
|
if (bitmap_is_midx(bitmap_git)) {
|
|
uint32_t pack_pos;
|
|
uint32_t midx_pos = pack_pos_to_midx(bitmap_git->midx, base + offset);
|
|
off_t offset = nth_midxed_offset(bitmap_git->midx, midx_pos);
|
|
|
|
uint32_t pack_id = nth_midxed_pack_int_id(bitmap_git->midx, midx_pos);
|
|
struct packed_git *pack = bitmap_git->midx->packs[pack_id];
|
|
|
|
if (offset_to_pack_pos(pack, offset, &pack_pos) < 0) {
|
|
struct object_id oid;
|
|
nth_midxed_object_oid(&oid, bitmap_git->midx, midx_pos);
|
|
|
|
die(_("could not find %s in pack %s at offset %"PRIuMAX),
|
|
oid_to_hex(&oid),
|
|
pack->pack_name,
|
|
(uintmax_t)offset);
|
|
}
|
|
|
|
total += pack_pos_to_offset(pack, pack_pos + 1) - offset;
|
|
} else {
|
|
size_t pos = base + offset;
|
|
total += pack_pos_to_offset(bitmap_git->pack, pos + 1) -
|
|
pack_pos_to_offset(bitmap_git->pack, pos);
|
|
}
|
|
}
|
|
}
|
|
|
|
return total;
|
|
}
|
|
|
|
static off_t get_disk_usage_for_extended(struct bitmap_index *bitmap_git)
|
|
{
|
|
struct bitmap *result = bitmap_git->result;
|
|
struct eindex *eindex = &bitmap_git->ext_index;
|
|
off_t total = 0;
|
|
struct object_info oi = OBJECT_INFO_INIT;
|
|
off_t object_size;
|
|
size_t i;
|
|
|
|
oi.disk_sizep = &object_size;
|
|
|
|
for (i = 0; i < eindex->count; i++) {
|
|
struct object *obj = eindex->objects[i];
|
|
|
|
if (!bitmap_get(result, bitmap_num_objects(bitmap_git) + i))
|
|
continue;
|
|
|
|
if (oid_object_info_extended(the_repository, &obj->oid, &oi, 0) < 0)
|
|
die(_("unable to get disk usage of %s"),
|
|
oid_to_hex(&obj->oid));
|
|
|
|
total += object_size;
|
|
}
|
|
return total;
|
|
}
|
|
|
|
off_t get_disk_usage_from_bitmap(struct bitmap_index *bitmap_git,
|
|
struct rev_info *revs)
|
|
{
|
|
off_t total = 0;
|
|
|
|
total += get_disk_usage_for_type(bitmap_git, OBJ_COMMIT);
|
|
if (revs->tree_objects)
|
|
total += get_disk_usage_for_type(bitmap_git, OBJ_TREE);
|
|
if (revs->blob_objects)
|
|
total += get_disk_usage_for_type(bitmap_git, OBJ_BLOB);
|
|
if (revs->tag_objects)
|
|
total += get_disk_usage_for_type(bitmap_git, OBJ_TAG);
|
|
|
|
total += get_disk_usage_for_extended(bitmap_git);
|
|
|
|
return total;
|
|
}
|
|
|
|
int bitmap_is_midx(struct bitmap_index *bitmap_git)
|
|
{
|
|
return !!bitmap_git->midx;
|
|
}
|
|
|
|
const struct string_list *bitmap_preferred_tips(struct repository *r)
|
|
{
|
|
return repo_config_get_value_multi(r, "pack.preferbitmaptips");
|
|
}
|
|
|
|
int bitmap_is_preferred_refname(struct repository *r, const char *refname)
|
|
{
|
|
const struct string_list *preferred_tips = bitmap_preferred_tips(r);
|
|
struct string_list_item *item;
|
|
|
|
if (!preferred_tips)
|
|
return 0;
|
|
|
|
for_each_string_list_item(item, preferred_tips) {
|
|
if (starts_with(refname, item->string))
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|