[PATCH 4/4] pack-bitmap: drop "loaded" flag

[Jeff King]

In the early days of the bitmap code, there was a single
static bitmap_index struct that was used behind the scenes,
and any bitmap-related functions could lazily check
bitmap_git.loaded to see if they needed to read the on-disk
data.

But since 3ae5fa0768 (pack-bitmap: remove bitmap_git global
variable, 2018-06-07), the caller is responsible for the
lifetime of the bitmap_index struct, and we return it from
prepare_bitmap_git() and prepare_bitmap_walk(), both of
which load the on-disk data (or return NULL).

So outside of these functions, it's not possible to have a
bitmap_index for which the loaded flag is not true. Nor is
it possible to accidentally pass an already-loaded
bitmap_index to the loading function (which is static-local
to the file).

We can drop this unnecessary and confusing flag.

Signed-off-by: Jeff King <p...@peff.net>
---
 pack-bitmap.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/pack-bitmap.c b/pack-bitmap.c
index 8c1af1cca2..40debd5e20 100644
--- a/pack-bitmap.c
+++ b/pack-bitmap.c
@@ -91,8 +91,6 @@ struct bitmap_index {
 
        /* Version of the bitmap index */
        unsigned int version;
-
-       unsigned loaded : 1;
 };
 
 static struct ewah_bitmap *lookup_stored_bitmap(struct stored_bitmap *st)
@@ -306,7 +304,7 @@ static int open_pack_bitmap_1(struct bitmap_index 
*bitmap_git, struct packed_git
 
 static int load_pack_bitmap(struct bitmap_index *bitmap_git)
 {
-       assert(bitmap_git->map && !bitmap_git->loaded);
+       assert(bitmap_git->map);
 
        bitmap_git->bitmaps = kh_init_sha1();
        bitmap_git->ext_index.positions = kh_init_sha1_pos();
@@ -321,7 +319,6 @@ static int load_pack_bitmap(struct bitmap_index *bitmap_git)
        if (load_bitmap_entries_v1(bitmap_git) < 0)
                goto failed;
 
-       bitmap_git->loaded = 1;
        return 0;
 
 failed:
@@ -336,7 +333,7 @@ static int open_pack_bitmap(struct bitmap_index *bitmap_git)
        struct packed_git *p;
        int ret = -1;
 
-       assert(!bitmap_git->map && !bitmap_git->loaded);
+       assert(!bitmap_git->map);
 
        for (p = get_packed_git(the_repository); p; p = p->next) {
                if (open_pack_bitmap_1(bitmap_git, p) == 0)
@@ -738,7 +735,7 @@ struct bitmap_index *prepare_bitmap_walk(struct rev_info 
*revs)
         * 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 (!bitmap_git->loaded && load_pack_bitmap(bitmap_git) < 0)
+       if (load_pack_bitmap(bitmap_git) < 0)
                goto cleanup;
 
        object_array_clear(&revs->pending);
-- 
2.19.0.rc1.549.g6ce4dc0f08