From 3ae5fa0768f7f9781b40b1d40cb2f9f4c753bad4 Mon Sep 17 00:00:00 2001 From: Jonathan Tan Date: Thu, 7 Jun 2018 12:04:13 -0700 Subject: pack-bitmap: remove bitmap_git global variable 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 Signed-off-by: Jonathan Tan Helped-by: Jeff King Signed-off-by: Junio C Hamano --- pack-bitmap.h | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) (limited to 'pack-bitmap.h') diff --git a/pack-bitmap.h b/pack-bitmap.h index 5ded2f139a..19f70043a8 100644 --- a/pack-bitmap.h +++ b/pack-bitmap.h @@ -34,13 +34,20 @@ typedef int (*show_reachable_fn)( struct packed_git *found_pack, off_t found_offset); -int prepare_bitmap_git(void); -void count_bitmap_commit_list(uint32_t *commits, uint32_t *trees, uint32_t *blobs, uint32_t *tags); -void traverse_bitmap_commit_list(show_reachable_fn show_reachable); +struct bitmap_index; + +struct bitmap_index *prepare_bitmap_git(void); +void count_bitmap_commit_list(struct bitmap_index *, uint32_t *commits, + uint32_t *trees, uint32_t *blobs, uint32_t *tags); +void traverse_bitmap_commit_list(struct bitmap_index *, + show_reachable_fn show_reachable); void test_bitmap_walk(struct rev_info *revs); -int prepare_bitmap_walk(struct rev_info *revs); -int reuse_partial_packfile_from_bitmap(struct packed_git **packfile, uint32_t *entries, off_t *up_to); -int rebuild_existing_bitmaps(struct packing_data *mapping, khash_sha1 *reused_bitmaps, int show_progress); +struct bitmap_index *prepare_bitmap_walk(struct rev_info *revs); +int reuse_partial_packfile_from_bitmap(struct bitmap_index *, + struct packed_git **packfile, + uint32_t *entries, off_t *up_to); +int rebuild_existing_bitmaps(struct bitmap_index *, struct packing_data *mapping, + khash_sha1 *reused_bitmaps, int show_progress); void bitmap_writer_show_progress(int show); void bitmap_writer_set_checksum(unsigned char *sha1); -- cgit v1.2.3