[PATCH 13/44] pack: move approximate object count to object store

[Nguyễn Thái Ngọc Duy]

From: Stefan Beller <sbel...@google.com>

The approximate_object_count() function maintains a rough count of
objects in a repository to estimate how long object name abbreviates
should be.  Object names are scoped to a repository and the
appropriate length may differ by repository, so the object count
should not be global.

Signed-off-by: Stefan Beller <sbel...@google.com>
Signed-off-by: Jonathan Nieder <jrnie...@gmail.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 object-store.h |  8 ++++++++
 packfile.c     | 11 +++++------
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/object-store.h b/object-store.h
index b954396615..56ed4bd9e9 100644
--- a/object-store.h
+++ b/object-store.h
@@ -93,6 +93,14 @@ struct raw_object_store {
        struct alternate_object_database *alt_odb_list;
        struct alternate_object_database **alt_odb_tail;
 
+       /*
+        * A fast, rough count of the number of objects in the repository.
+        * These two fields are not meant for direct access. Use
+        * approximate_object_count() instead.
+        */
+       unsigned long approximate_object_count;
+       unsigned approximate_object_count_valid : 1;
+
        /*
         * Whether packed_git has already been populated with this repository's
         * packs.
diff --git a/packfile.c b/packfile.c
index caeab0f68c..ce4cd7d5c9 100644
--- a/packfile.c
+++ b/packfile.c
@@ -802,8 +802,6 @@ static void prepare_packed_git_one(char *objdir, int local)
        strbuf_release(&path);
 }
 
-static int approximate_object_count_valid;
-
 /*
  * Give a fast, rough count of the number of objects in the repository. This
  * ignores loose objects completely. If you have a lot of them, then either
@@ -813,8 +811,8 @@ static int approximate_object_count_valid;
  */
 unsigned long approximate_object_count(void)
 {
-       static unsigned long count;
-       if (!approximate_object_count_valid) {
+       if (!the_repository->objects.approximate_object_count_valid) {
+               unsigned long count;
                struct packed_git *p;
 
                prepare_packed_git();
@@ -824,8 +822,9 @@ unsigned long approximate_object_count(void)
                                continue;
                        count += p->num_objects;
                }
+               the_repository->objects.approximate_object_count = count;
        }
-       return count;
+       return the_repository->objects.approximate_object_count;
 }
 
 static void *get_next_packed_git(const void *p)
@@ -900,7 +899,7 @@ void prepare_packed_git(void)
 
 void reprepare_packed_git(void)
 {
-       approximate_object_count_valid = 0;
+       the_repository->objects.approximate_object_count_valid = 0;
        the_repository->objects.packed_git_initialized = 0;
        prepare_packed_git();
 }
-- 
2.16.1.435.g8f24da2e1a