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refs: record the ref_store in ref_cache, not ref_dir

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Instead of keeping a pointer to the `ref_store` in every `ref_dir`
entry, store it once in `struct ref_cache`, and change `struct
ref_dir` to include a pointer to its containing `ref_cache` instead.
This makes it easier to add to the information that is accessible from
a `ref_dir` without increasing the size of every `ref_dir` instance.

Note that previously, every `ref_dir` pointed at the containing
`files_ref_store` regardless of whether it was a part of the loose or
packed reference cache. Now we have to be sure to initialize the
instances to point at the correct containing `ref_cache`. So change
`create_dir_entry()` to take a `ref_cache` parameter, and change its
callers to pass the correct `ref_cache` depending on the purpose of
the new `dir_entry`.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael Haggerty 2017-04-16 08:41:33 +02:00 committed by Junio C Hamano
parent 7c22bc8a18
commit e00d1a4ff7
3 changed files with 16 additions and 11 deletions
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6
refs/files-backend.c
View file

@ -432,7 +432,7 @@ static void add_packed_ref(struct files_ref_store *refs,
*/
void read_loose_refs(const char *dirname, struct ref_dir *dir)
{
struct files_ref_store *refs = dir->ref_store;
struct files_ref_store *refs = dir->cache->ref_store;
DIR *d;
struct dirent *de;
int dirnamelen = strlen(dirname);
@ -468,7 +468,7 @@ void read_loose_refs(const char *dirname, struct ref_dir *dir)
} else if (S_ISDIR(st.st_mode)) {
strbuf_addch(&refname, '/');
add_entry_to_dir(dir,
create_dir_entry(refs, refname.buf,
create_dir_entry(dir->cache, refname.buf,
refname.len, 1));
} else {
if (!refs_resolve_ref_unsafe(&refs->base,
@ -525,7 +525,7 @@ static struct ref_dir *get_loose_refs(struct files_ref_store *refs)
* lazily):
*/
add_entry_to_dir(get_ref_dir(refs->loose->root),
create_dir_entry(refs, "refs/", 5, 1));
create_dir_entry(refs->loose, "refs/", 5, 1));
}
return get_ref_dir(refs->loose->root);
}

12
refs/ref-cache.c
View file

@ -36,7 +36,7 @@ struct ref_dir *get_ref_dir(struct ref_entry *entry)
int pos = search_ref_dir(dir, "refs/bisect/", 12);
if (pos < 0) {
struct ref_entry *child_entry;
child_entry = create_dir_entry(dir->ref_store,
child_entry = create_dir_entry(dir->cache,
"refs/bisect/",
12, 1);
add_entry_to_dir(dir, child_entry);
@ -67,7 +67,8 @@ struct ref_cache *create_ref_cache(struct files_ref_store *refs)
{
struct ref_cache *ret = xcalloc(1, sizeof(*ret));
ret->root = create_dir_entry(refs, "", 0, 1);
ret->ref_store = refs;
ret->root = create_dir_entry(ret, "", 0, 1);
return ret;
}
@ -104,13 +105,14 @@ static void clear_ref_dir(struct ref_dir *dir)
dir->entries = NULL;
}
struct ref_entry *create_dir_entry(struct files_ref_store *ref_store,
struct ref_entry *create_dir_entry(struct ref_cache *cache,
const char *dirname, size_t len,
int incomplete)
{
struct ref_entry *direntry;
FLEX_ALLOC_MEM(direntry, name, dirname, len);
direntry->u.subdir.ref_store = ref_store;
direntry->u.subdir.cache = cache;
direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0);
return direntry;
}
@ -181,7 +183,7 @@ static struct ref_dir *search_for_subdir(struct ref_dir *dir,
* therefore, create an empty record for it but mark
* the record complete.
*/
entry = create_dir_entry(dir->ref_store, subdirname, len, 0);
entry = create_dir_entry(dir->cache, subdirname, len, 0);
add_entry_to_dir(dir, entry);
} else {
entry = dir->entries[entry_index];

9
refs/ref-cache.h
View file

@ -3,6 +3,9 @@
struct ref_cache {
struct ref_entry *root;
/* A pointer to the files_ref_store whose cache this is: */
struct files_ref_store *ref_store;
};
/*
@ -66,8 +69,8 @@ struct ref_dir {
*/
int sorted;
/* A pointer to the files_ref_store that contains this ref_dir. */
struct files_ref_store *ref_store;
/* The ref_cache containing this entry: */
struct ref_cache *cache;
struct ref_entry **entries;
};
@ -161,7 +164,7 @@ struct ref_dir *get_ref_dir(struct ref_entry *entry);
* dirname is the name of the directory with a trailing slash (e.g.,
* "refs/heads/") or "" for the top-level directory.
*/
struct ref_entry *create_dir_entry(struct files_ref_store *ref_store,
struct ref_entry *create_dir_entry(struct ref_cache *cache,
const char *dirname, size_t len,
int incomplete);