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Merge branch 'tb/reverse-midx'

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An on-disk reverse-index to map the in-pack location of an object
back to its object name across multiple packfiles is introduced.

* tb/reverse-midx:
  midx.c: improve cache locality in midx_pack_order_cmp()
  pack-revindex: write multi-pack reverse indexes
  pack-write.c: extract 'write_rev_file_order'
  pack-revindex: read multi-pack reverse indexes
  Documentation/technical: describe multi-pack reverse indexes
  midx: make some functions non-static
  midx: keep track of the checksum
  midx: don't free midx_name early
  midx: allow marking a pack as preferred
  t/helper/test-read-midx.c: add '--show-objects'
  builtin/multi-pack-index.c: display usage on unrecognized command
  builtin/multi-pack-index.c: don't enter bogus cmd_mode
  builtin/multi-pack-index.c: split sub-commands
  builtin/multi-pack-index.c: define common usage with a macro
  builtin/multi-pack-index.c: don't handle 'progress' separately
  builtin/multi-pack-index.c: inline 'flags' with options
This commit is contained in:
Junio C Hamano
2021-04-08 13:23:25 -07:00
parent a0dda6023e 3007752461
commit e6b971fcf5
14 changed files with 741 additions and 76 deletions
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36
pack-write.c
View File

@ -201,21 +201,12 @@ static void write_rev_header(struct hashfile *f)
}
static void write_rev_index_positions(struct hashfile *f,
struct pack_idx_entry **objects,
uint32_t *pack_order,
uint32_t nr_objects)
{
uint32_t *pack_order;
uint32_t i;
ALLOC_ARRAY(pack_order, nr_objects);
for (i = 0; i < nr_objects; i++)
pack_order[i] = i;
QSORT_S(pack_order, nr_objects, pack_order_cmp, objects);
for (i = 0; i < nr_objects; i++)
hashwrite_be32(f, pack_order[i]);
free(pack_order);
}
static void write_rev_trailer(struct hashfile *f, const unsigned char *hash)
@ -228,6 +219,29 @@ const char *write_rev_file(const char *rev_name,
uint32_t nr_objects,
const unsigned char *hash,
unsigned flags)
{
uint32_t *pack_order;
uint32_t i;
const char *ret;
ALLOC_ARRAY(pack_order, nr_objects);
for (i = 0; i < nr_objects; i++)
pack_order[i] = i;
QSORT_S(pack_order, nr_objects, pack_order_cmp, objects);
ret = write_rev_file_order(rev_name, pack_order, nr_objects, hash,
flags);
free(pack_order);
return ret;
}
const char *write_rev_file_order(const char *rev_name,
uint32_t *pack_order,
uint32_t nr_objects,
const unsigned char *hash,
unsigned flags)
{
struct hashfile *f;
int fd;
@ -262,7 +276,7 @@ const char *write_rev_file(const char *rev_name,
write_rev_header(f);
write_rev_index_positions(f, objects, nr_objects);
write_rev_index_positions(f, pack_order, nr_objects);
write_rev_trailer(f, hash);
if (rev_name && adjust_shared_perm(rev_name) < 0)