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pack-bitmap: remove bitmap_git global variable

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Remove the bitmap_git global variable. Instead, generate on demand an
instance of struct bitmap_index for code that needs to access it.

This allows us significant control over the lifetime of instances of
struct bitmap_index. In particular, packs can now be closed without
worrying if an unnecessarily long-lived "pack" field in struct
bitmap_index still points to it.

The bitmap API is also clearer in that we need to first obtain a struct
bitmap_index, then we use it.

This patch raises two potential issues: (1) memory for the struct
bitmap_index is allocated without being freed, and (2)
prepare_bitmap_git() and prepare_bitmap_walk() can reuse a previously
loaded bitmap. For (1), this will be dealt with in a subsequent patch in
this patch set that also deals with freeing the contents of the struct
bitmap_index (which were not freed previously, because they have global
scope). For (2), current bitmap users only load the bitmap once at most
(note that pack-objects can use bitmaps or write bitmaps, but not both
at the same time), so support for reuse has no effect - and future users
can pass around the struct bitmap_index * obtained if they need to do 2
or more things with the same bitmap.

Helped-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan
2018-06-07 12:04:13 -07:00
committed by Junio C Hamano
parent 53f9a3e157
commit 3ae5fa0768
5 changed files with 201 additions and 158 deletions
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6
pack-bitmap-write.c
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@@ -360,11 +360,13 @@ static int date_compare(const void *_a, const void *_b)
void bitmap_writer_reuse_bitmaps(struct packing_data *to_pack)
{
if (prepare_bitmap_git() < 0)
struct bitmap_index *bitmap_git;
if (!(bitmap_git = prepare_bitmap_git()))
return;
writer.reused = kh_init_sha1();
rebuild_existing_bitmaps(to_pack, writer.reused, writer.show_progress);
rebuild_existing_bitmaps(bitmap_git, to_pack, writer.reused,
writer.show_progress);
}
static struct ewah_bitmap *find_reused_bitmap(const unsigned char *sha1)