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https://github.com/git-for-windows/git.git
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ef07ec7a90
The packed object source has been refactored into a proper struct odb_source. * ps/odb-source-packed: odb/source-packed: drop pointer to "files" parent source midx: refactor interfaces to work on "packed" source odb/source-packed: stub out remaining functions odb/source-packed: wire up `freshen_object()` callback odb/source-packed: wire up `find_abbrev_len()` callback odb/source-packed: wire up `count_objects()` callback odb/source-packed: wire up `for_each_object()` callback odb/source-packed: wire up `read_object_stream()` callback odb/source-packed: wire up `read_object_info()` callback packfile: use higher-level interface to implement `has_object_pack()` odb/source-packed: wire up `reprepare()` callback odb/source-packed: wire up `close()` callback odb/source-packed: start converting to a proper `struct odb_source` odb/source-packed: store pointer to "files" instead of generic source packfile: move packed source into "odb/" subsystem packfile: split out packfile list logic packfile: rename `struct packfile_store` to `odb_source_packed`
95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
#ifndef ODB_SOURCE_PACKED_H
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#define ODB_SOURCE_PACKED_H
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#include "odb/source.h"
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#include "packfile-list.h"
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#include "strmap.h"
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/*
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* A store that manages packfiles for a given object database.
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*/
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struct odb_source_packed {
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struct odb_source base;
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/*
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* The list of packfiles in the order in which they have been most
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* recently used.
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*/
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struct packfile_list packs;
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/*
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* Cache of packfiles which are marked as "kept", either because there
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* is an on-disk ".keep" file or because they are marked as "kept" in
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* memory.
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*
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* Should not be accessed directly, but via
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* `packfile_store_get_kept_pack_cache()`. The list of packs gets
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* invalidated when the stored flags and the flags passed to
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* `packfile_store_get_kept_pack_cache()` mismatch.
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*/
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struct {
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struct packed_git **packs;
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unsigned flags;
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} kept_cache;
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/* The multi-pack index that belongs to this specific packfile store. */
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struct multi_pack_index *midx;
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/*
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* A map of packfile names to packed_git structs for tracking which
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* packs have been loaded already.
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*/
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struct strmap packs_by_path;
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/*
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* Whether packfiles have already been populated with this store's
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* packs.
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*/
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bool initialized;
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/*
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* Usually, packfiles will be reordered to the front of the `packs`
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* list whenever an object is looked up via them. This has the effect
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* that packs that contain a lot of accessed objects will be located
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* towards the front.
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*
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* This is usually desirable, but there are exceptions. One exception
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* is when the looking up multiple objects in a loop for each packfile.
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* In that case, we may easily end up with an infinite loop as the
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* packfiles get reordered to the front repeatedly.
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*
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* Setting this field to `true` thus disables these reorderings.
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*/
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bool skip_mru_updates;
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};
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/*
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* Allocate and initialize a new empty packfile store for the given object
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* database.
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*/
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struct odb_source_packed *odb_source_packed_new(struct object_database *odb,
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const char *path,
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bool local);
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/*
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* Cast the given object database source to the packed backend. This will cause
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* a BUG in case the source doesn't use this backend.
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*/
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static inline struct odb_source_packed *odb_source_packed_downcast(struct odb_source *source)
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{
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if (source->type != ODB_SOURCE_PACKED)
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BUG("trying to downcast source of type '%d' to packed", source->type);
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return container_of(source, struct odb_source_packed, base);
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}
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/*
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* Prepare the source by loading packfiles and multi-pack indices for
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* all alternates. This becomes a no-op if the source is already prepared.
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*
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* It shouldn't typically be necessary to call this function directly, as
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* functions that access the source know to prepare it.
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*/
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void odb_source_packed_prepare(struct odb_source_packed *source);
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#endif
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