[PATCH v2 1/4] packfile: close and free packs upon releasing an object store

[Stefan Beller <sbeller@google.com>]

In d0b59866223 (object-store: close all packs upon clearing the object
store, 2018-03-23), we made sure to close all packfiles on releasing
an object store, but we also have to free the memory of the closed packs.

Signed-off-by: Stefan Beller <sbeller@google.com>
---

Notes:
    > Should that INIT_LIST_HEAD get moved down into that function?
    
    done.
    
    > Probably the same applies to setting NULL here; you're left with a
    > dangling pointer if you just call close_and_free_packs(). Should
    > that helper maybe just be a static function in object.c?
    
    I just realize that
    
    	while (o->packed_git) {
    		...
    		o->packed_git = p->next;
    		...
    	}
    
    will make sure that o->packed_git is NULL afterwards,
    hence I removed the explicit set to NULL in object.c
    and we rely on the code in replace-object.c
    
    Thanks,
    Stefan

 object.c   |  4 +---
 packfile.c | 13 +++++++++++++
 packfile.h |  1 +
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/object.c b/object.c
index 66cffaf6e51..242d922d953 100644
--- a/object.c
+++ b/object.c
@@ -484,7 +484,5 @@ void raw_object_store_clear(struct raw_object_store *o)
 	free_alt_odbs(o);
 	o->alt_odb_tail = NULL;
 
-	INIT_LIST_HEAD(&o->packed_git_mru);
-	close_all_packs(o);
-	o->packed_git = NULL;
+	close_and_free_packs(o);
 }
diff --git a/packfile.c b/packfile.c
index 6c3ddc3c31d..7f2a9e28a2b 100644
--- a/packfile.c
+++ b/packfile.c
@@ -322,6 +322,19 @@ void close_all_packs(struct raw_object_store *o)
 			close_pack(p);
 }
 
+void close_and_free_packs(struct raw_object_store *o)
+{
+	close_all_packs(o);
+
+	INIT_LIST_HEAD(&o->packed_git_mru);
+
+	while (o->packed_git) {
+		struct packed_git *p = o->packed_git;
+		o->packed_git = p->next;
+		free(p);
+	}
+}
+
 /*
  * The LRU pack is the one with the oldest MRU window, preferring packs
  * with no used windows, or the oldest mtime if it has no windows allocated.
diff --git a/packfile.h b/packfile.h
index 9c2f8859945..cdab0557979 100644
--- a/packfile.h
+++ b/packfile.h
@@ -67,6 +67,7 @@ extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t
 extern void close_pack_windows(struct packed_git *);
 extern void close_pack(struct packed_git *);
 extern void close_all_packs(struct raw_object_store *o);
+extern void close_and_free_packs(struct raw_object_store *o);
 extern void unuse_pack(struct pack_window **);
 extern void clear_delta_base_cache(void);
 extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
-- 
2.17.0.255.g8bfb7c0704