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odb: prepare struct odb_transaction to become generic

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An ODB transaction handles how objects are stored temporarily and
eventually committed. Due to object storage being implemented
differently for a given ODB source, the ODB transactions must be
implemented in a manner specific to the source the objects are being
written to. To provide generic transactions, `struct odb_transaction` is
updated to store a commit callback that can be configured to support a
specific ODB source. For now `struct odb_transaction_files` is the
only transaction type and what is always returned when starting a
transaction.

Signed-off-by: Justin Tobler <jltobler@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Justin Tobler
2026-02-02 18:10:01 -06:00
committed by Junio C Hamano
parent 8bf06d05a5
commit fa7d067923
4 changed files with 65 additions and 43 deletions
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80
object-file.c
View File

@@ -710,15 +710,17 @@ struct transaction_packfile {
uint32_t nr_written;
};
struct odb_transaction {
struct odb_source *source;
struct odb_transaction_files {
struct odb_transaction base;
struct tmp_objdir *objdir;
struct transaction_packfile packfile;
};
static void prepare_loose_object_transaction(struct odb_transaction *transaction)
static void prepare_loose_object_transaction(struct odb_transaction *base)
{
struct odb_transaction_files *transaction = (struct odb_transaction_files *)base;
/*
* We lazily create the temporary object directory
* the first time an object might be added, since
@@ -728,14 +730,16 @@ static void prepare_loose_object_transaction(struct odb_transaction *transaction
if (!transaction || transaction->objdir)
return;
transaction->objdir = tmp_objdir_create(transaction->source->odb->repo, "bulk-fsync");
transaction->objdir = tmp_objdir_create(base->source->odb->repo, "bulk-fsync");
if (transaction->objdir)
tmp_objdir_replace_primary_odb(transaction->objdir, 0);
}
static void fsync_loose_object_transaction(struct odb_transaction *transaction,
static void fsync_loose_object_transaction(struct odb_transaction *base,
int fd, const char *filename)
{
struct odb_transaction_files *transaction = (struct odb_transaction_files *)base;
/*
* If we have an active ODB transaction, we issue a call that
* cleans the filesystem page cache but avoids a hardware flush
@@ -754,7 +758,7 @@ static void fsync_loose_object_transaction(struct odb_transaction *transaction,
/*
* Cleanup after batch-mode fsync_object_files.
*/
static void flush_loose_object_transaction(struct odb_transaction *transaction)
static void flush_loose_object_transaction(struct odb_transaction_files *transaction)
{
struct strbuf temp_path = STRBUF_INIT;
struct tempfile *temp;
@@ -772,7 +776,7 @@ static void flush_loose_object_transaction(struct odb_transaction *transaction)
* the final name is visible.
*/
strbuf_addf(&temp_path, "%s/bulk_fsync_XXXXXX",
repo_get_object_directory(transaction->source->odb->repo));
repo_get_object_directory(transaction->base.source->odb->repo));
temp = xmks_tempfile(temp_path.buf);
fsync_or_die(get_tempfile_fd(temp), get_tempfile_path(temp));
delete_tempfile(&temp);
@@ -1340,11 +1344,11 @@ static int index_core(struct index_state *istate,
return ret;
}
static int already_written(struct odb_transaction *transaction,
static int already_written(struct odb_transaction_files *transaction,
struct object_id *oid)
{
/* The object may already exist in the repository */
if (odb_has_object(transaction->source->odb, oid,
if (odb_has_object(transaction->base.source->odb, oid,
HAS_OBJECT_RECHECK_PACKED | HAS_OBJECT_FETCH_PROMISOR))
return 1;
@@ -1358,14 +1362,14 @@ static int already_written(struct odb_transaction *transaction,
}
/* Lazily create backing packfile for the state */
static void prepare_packfile_transaction(struct odb_transaction *transaction,
static void prepare_packfile_transaction(struct odb_transaction_files *transaction,
unsigned flags)
{
struct transaction_packfile *state = &transaction->packfile;
if (!(flags & INDEX_WRITE_OBJECT) || state->f)
return;
state->f = create_tmp_packfile(transaction->source->odb->repo,
state->f = create_tmp_packfile(transaction->base.source->odb->repo,
&state->pack_tmp_name);
reset_pack_idx_option(&state->pack_idx_opts);
@@ -1466,10 +1470,10 @@ static int stream_blob_to_pack(struct transaction_packfile *state,
return 0;
}
static void flush_packfile_transaction(struct odb_transaction *transaction)
static void flush_packfile_transaction(struct odb_transaction_files *transaction)
{
struct transaction_packfile *state = &transaction->packfile;
struct repository *repo = transaction->source->odb->repo;
struct repository *repo = transaction->base.source->odb->repo;
unsigned char hash[GIT_MAX_RAWSZ];
struct strbuf packname = STRBUF_INIT;
char *idx_tmp_name = NULL;
@@ -1494,7 +1498,7 @@ static void flush_packfile_transaction(struct odb_transaction *transaction)
}
strbuf_addf(&packname, "%s/pack/pack-%s.",
repo_get_object_directory(transaction->source->odb->repo),
repo_get_object_directory(transaction->base.source->odb->repo),
hash_to_hex_algop(hash, repo->hash_algo));
stage_tmp_packfiles(repo, &packname, state->pack_tmp_name,
@@ -1534,7 +1538,7 @@ clear_exit:
* binary blobs, they generally do not want to get any conversion, and
* callers should avoid this code path when filters are requested.
*/
static int index_blob_packfile_transaction(struct odb_transaction *transaction,
static int index_blob_packfile_transaction(struct odb_transaction_files *transaction,
struct object_id *result_oid, int fd,
size_t size, const char *path,
unsigned flags)
@@ -1553,7 +1557,7 @@ static int index_blob_packfile_transaction(struct odb_transaction *transaction,
header_len = format_object_header((char *)obuf, sizeof(obuf),
OBJ_BLOB, size);
transaction->source->odb->repo->hash_algo->init_fn(&ctx);
transaction->base.source->odb->repo->hash_algo->init_fn(&ctx);
git_hash_update(&ctx, obuf, header_len);
/* Note: idx is non-NULL when we are writing */
@@ -1629,10 +1633,11 @@ int index_fd(struct index_state *istate, struct object_id *oid,
ret = index_core(istate, oid, fd, xsize_t(st->st_size),
type, path, flags);
} else {
struct object_database *odb = the_repository->objects;
struct odb_transaction *transaction;
transaction = odb_transaction_begin(the_repository->objects);
ret = index_blob_packfile_transaction(the_repository->objects->transaction,
transaction = odb_transaction_begin(odb);
ret = index_blob_packfile_transaction((struct odb_transaction_files *)odb->transaction,
oid, fd,
xsize_t(st->st_size),
path, flags);
@@ -1985,33 +1990,36 @@ out:
return ret;
}
static void odb_transaction_files_commit(struct odb_transaction *base)
{
struct odb_transaction_files *transaction = (struct odb_transaction_files *)base;
/*
* Ensure the transaction ending matches the pending transaction.
*/
ASSERT(base == base->source->odb->transaction);
flush_loose_object_transaction(transaction);
flush_packfile_transaction(transaction);
base->source->odb->transaction = NULL;
free(transaction);
}
struct odb_transaction *odb_transaction_files_begin(struct odb_source *source)
{
struct odb_transaction_files *transaction;
struct object_database *odb = source->odb;
if (odb->transaction)
return NULL;
CALLOC_ARRAY(odb->transaction, 1);
odb->transaction->source = source;
transaction = xcalloc(1, sizeof(*transaction));
transaction->base.source = source;
transaction->base.commit = odb_transaction_files_commit;
return odb->transaction;
}
odb->transaction = &transaction->base;
void odb_transaction_files_commit(struct odb_transaction *transaction)
{
if (!transaction)
return;
/*
* Ensure the transaction ending matches the pending transaction.
*/
ASSERT(transaction == transaction->source->odb->transaction);
flush_loose_object_transaction(transaction);
flush_packfile_transaction(transaction);
transaction->source->odb->transaction = NULL;
free(transaction);
return &transaction->base;
}
struct odb_source_loose *odb_source_loose_new(struct odb_source *source)

6
object-file.h
View File

@@ -208,10 +208,4 @@ struct odb_transaction;
*/
struct odb_transaction *odb_transaction_files_begin(struct odb_source *source);
/*
* Tell the object database to make any objects from the
* current transaction visible.
*/
void odb_transaction_files_commit(struct odb_transaction *transaction);
#endif /* OBJECT_FILE_H */

5
odb.c
View File

@@ -1158,5 +1158,8 @@ struct odb_transaction *odb_transaction_begin(struct object_database *odb)
void odb_transaction_commit(struct odb_transaction *transaction)
{
odb_transaction_files_commit(transaction);
if (!transaction)
return;
transaction->commit(transaction);
}

17
odb.h
View File

@@ -77,7 +77,24 @@ struct odb_source {
struct packed_git;
struct packfile_store;
struct cached_object_entry;
/*
* A transaction may be started for an object database prior to writing new
* objects via odb_transaction_begin(). These objects are not committed until
* odb_transaction_commit() is invoked. Only a single transaction may be pending
* at a time.
*
* Each ODB source is expected to implement its own transaction handling.
*/
struct odb_transaction;
typedef void (*odb_transaction_commit_fn)(struct odb_transaction *transaction);
struct odb_transaction {
/* The ODB source the transaction is opened against. */
struct odb_source *source;
/* The ODB source specific callback invoked to commit a transaction. */
odb_transaction_commit_fn commit;
};
/*
* The object database encapsulates access to objects in a repository. It