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object-file: move loose object cache into loose source

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Our loose objects use a cache that (optionally) stores all objects for
each of the opened sharding directories. This cache is located in the
`struct odb_source`, but now that we have `struct odb_source_loose` it
makes sense to move it into the latter structure so that all state that
relates to loose objects is entirely self-contained.

Do so. While at it, rename corresponding functions to have a prefix that
relates to `struct odb_source_loose`.

Note that despite this prefix, the functions still accept a `struct
odb_source` as input. This is done intentionally: once we introduce
pluggable object databases, we will continue to accept this struct but
then do a cast inside these functions to `struct odb_source_loose`. This
design is similar to how we do it for our ref backends.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2025-11-03 08:42:01 +01:00
committed by Junio C Hamano
parent ece43d9dc7
commit 90a93f9dea
6 changed files with 39 additions and 36 deletions
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16
object-file.h
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@@ -20,6 +20,18 @@ struct odb_source;
struct odb_source_loose {
struct odb_source *source;
/*
* Used to store the results of readdir(3) calls when we are OK
* sacrificing accuracy due to races for speed. That includes
* object existence with OBJECT_INFO_QUICK, as well as
* our search for unique abbreviated hashes. Don't use it for tasks
* requiring greater accuracy!
*
* Be sure to call odb_load_loose_cache() before using.
*/
uint32_t subdir_seen[8]; /* 256 bits */
struct oidtree *cache;
};
struct odb_source_loose *odb_source_loose_new(struct odb_source *source);
@@ -29,8 +41,8 @@ void odb_source_loose_free(struct odb_source_loose *loose);
* Populate and return the loose object cache array corresponding to the
* given object ID.
*/
struct oidtree *odb_loose_cache(struct odb_source *source,
const struct object_id *oid);
struct oidtree *odb_source_loose_cache(struct odb_source *source,
const struct object_id *oid);
/* Empty the loose object cache for the specified object directory. */
void odb_clear_loose_cache(struct odb_source *source);