files-backend: move `lock` member to `files_ref_store`

Move the `lock` member from `packed_ref_cache` to `files_ref_store`,
since at most one cache can have a locked "packed-refs" file
associated with it. Rename it to `packed_refs_lock` to make its
purpose clearer in its new home. More changes are coming here shortly.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/refs/files-backend.c b/refs/files-backend.c
index fce8265aa730d0ff80e46d44f8e7a4f2f7b7d30d..bfc555a417d5d12da0e926d2cca09d5ef0369594 100644 (file)
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -43,15 +43,6 @@ struct packed_ref_cache {
         */
        unsigned int referrers;
 
-       /*
-        * Iff the packed-refs file associated with this instance is
-        * currently locked for writing, this points at the associated
-        * lock (which is owned by somebody else).  The referrer count
-        * is also incremented when the file is locked and decremented
-        * when it is unlocked.
-        */
-       struct lock_file *lock;
-
        /* The metadata from when this packed-refs cache was read */
        struct stat_validity validity;
 };
@@ -70,6 +61,13 @@ struct files_ref_store {
 
        struct ref_cache *loose;
        struct packed_ref_cache *packed;
+
+       /*
+        * Iff the packed-refs file associated with this instance is
+        * currently locked for writing, this points at the associated
+        * lock (which is owned by somebody else).
+        */
+       struct lock_file *packed_refs_lock;
 };
 
 /* Lock used for the main packed-refs file: */
@@ -104,7 +102,7 @@ static void clear_packed_ref_cache(struct files_ref_store *refs)
        if (refs->packed) {
                struct packed_ref_cache *packed_refs = refs->packed;
 
-               if (packed_refs->lock)
+               if (refs->packed_refs_lock)
                        die("BUG: packed-ref cache cleared while locked");
                refs->packed = NULL;
                release_packed_ref_cache(packed_refs);
@@ -396,7 +394,7 @@ static void add_packed_ref(struct files_ref_store *refs,
 {
        struct packed_ref_cache *packed_ref_cache = get_packed_ref_cache(refs);
 
-       if (!packed_ref_cache->lock)
+       if (!refs->packed_refs_lock)
                die("BUG: packed refs not locked");
        add_ref_entry(get_packed_ref_dir(packed_ref_cache),
                      create_ref_entry(refname, oid, REF_ISPACKED, 1));
@@ -1300,7 +1298,7 @@ static int lock_packed_refs(struct files_ref_store *refs, int flags)
         * the packed-refs file.
         */
        packed_ref_cache = get_packed_ref_cache(refs);
-       packed_ref_cache->lock = &packlock;
+       refs->packed_refs_lock = &packlock;
        /* Increment the reference count to prevent it from being freed: */
        acquire_packed_ref_cache(packed_ref_cache);
        return 0;
@@ -1323,10 +1321,10 @@ static int commit_packed_refs(struct files_ref_store *refs)
 
        files_assert_main_repository(refs, "commit_packed_refs");
 
-       if (!packed_ref_cache->lock)
+       if (!refs->packed_refs_lock)
                die("BUG: packed-refs not locked");
 
-       out = fdopen_lock_file(packed_ref_cache->lock, "w");
+       out = fdopen_lock_file(refs->packed_refs_lock, "w");
        if (!out)
                die_errno("unable to fdopen packed-refs descriptor");
 
@@ -1344,11 +1342,11 @@ static int commit_packed_refs(struct files_ref_store *refs)
        if (ok != ITER_DONE)
                die("error while iterating over references");
 
-       if (commit_lock_file(packed_ref_cache->lock)) {
+       if (commit_lock_file(refs->packed_refs_lock)) {
                save_errno = errno;
                error = -1;
        }
-       packed_ref_cache->lock = NULL;
+       refs->packed_refs_lock = NULL;
        release_packed_ref_cache(packed_ref_cache);
        errno = save_errno;
        return error;
@@ -1366,10 +1364,10 @@ static void rollback_packed_refs(struct files_ref_store *refs)
 
        files_assert_main_repository(refs, "rollback_packed_refs");
 
-       if (!packed_ref_cache->lock)
+       if (!refs->packed_refs_lock)
                die("BUG: packed-refs not locked");
-       rollback_lock_file(packed_ref_cache->lock);
-       packed_ref_cache->lock = NULL;
+       rollback_lock_file(refs->packed_refs_lock);
+       refs->packed_refs_lock = NULL;
        release_packed_ref_cache(packed_ref_cache);
        clear_packed_ref_cache(refs);
 }