/* Get the current 'next-key' value and bump the record. */
static svn_error_t *
get_key_and_bump(svn_fs_t *fs,
const char **key,
trail_t *trail,
apr_pool_t *pool)
{
base_fs_data_t *bfd = fs->fsap_data;
DBC *cursor;
char next_key[MAX_KEY_SIZE];
apr_size_t key_len;
int db_err;
DBT query;
DBT result;
/* ### todo: see issue #409 for why bumping the key as part of this
trail is problematic. */
/* Open a cursor and move it to the 'next-key' value. We can then fetch
the contents and use the cursor to overwrite those contents. Since
this database allows duplicates, we can't do an arbitrary 'put' to
write the new value -- that would append, not overwrite. */
svn_fs_base__trail_debug(trail, "strings", "cursor");
SVN_ERR(BDB_WRAP(fs, N_("creating cursor for reading a string"),
bfd->strings->cursor(bfd->strings, trail->db_txn,
&cursor, 0)));
/* Advance the cursor to 'next-key' and read it. */
db_err = svn_bdb_dbc_get(cursor,
svn_fs_base__str_to_dbt(&query, NEXT_KEY_KEY),
svn_fs_base__result_dbt(&result),
DB_SET);
if (db_err)
{
svn_bdb_dbc_close(cursor);
return BDB_WRAP(fs, N_("getting next-key value"), db_err);
}
svn_fs_base__track_dbt(&result, pool);
*key = apr_pstrmemdup(pool, result.data, result.size);
/* Bump to future key. */
key_len = result.size;
svn_fs_base__next_key(result.data, &key_len, next_key);
/* Shove the new key back into the database, at the cursor position. */
db_err = svn_bdb_dbc_put(cursor, &query,
svn_fs_base__str_to_dbt(&result, next_key),
DB_CURRENT);
if (db_err)
{
svn_bdb_dbc_close(cursor); /* ignore the error, the original is
more important. */
return BDB_WRAP(fs, N_("bumping next string key"), db_err);
}
return BDB_WRAP(fs, N_("closing string-reading cursor"),
svn_bdb_dbc_close(cursor));
}
svn_error_t *
svn_fs_bdb__write_new_rep(const char **key,
svn_fs_t *fs,
const representation_t *rep,
trail_t *trail,
apr_pool_t *pool)
{
base_fs_data_t *bfd = fs->fsap_data;
DBT query, result;
int db_err;
apr_size_t len;
char next_key[MAX_KEY_SIZE];
/* ### todo: see issue #409 for why bumping the key as part of this
trail is problematic. */
/* Get the current value associated with `next-key'. */
svn_fs_base__str_to_dbt(&query, NEXT_KEY_KEY);
svn_fs_base__trail_debug(trail, "representations", "get");
SVN_ERR(BDB_WRAP(fs, _("allocating new representation (getting next-key)"),
bfd->representations->get
(bfd->representations, trail->db_txn, &query,
svn_fs_base__result_dbt(&result), 0)));
svn_fs_base__track_dbt(&result, pool);
/* Store the new rep. */
*key = apr_pstrmemdup(pool, result.data, result.size);
SVN_ERR(svn_fs_bdb__write_rep(fs, *key, rep, trail, pool));
/* Bump to future key. */
len = result.size;
svn_fs_base__next_key(result.data, &len, next_key);
svn_fs_base__trail_debug(trail, "representations", "put");
db_err = bfd->representations->put
(bfd->representations, trail->db_txn,
svn_fs_base__str_to_dbt(&query, NEXT_KEY_KEY),
svn_fs_base__str_to_dbt(&result, next_key),
0);
SVN_ERR(BDB_WRAP(fs, _("bumping next representation key"), db_err));
return SVN_NO_ERROR;
}
svn_error_t *
svn_fs_bdb__new_node_id(svn_fs_id_t **id_p,
svn_fs_t *fs,
const char *copy_id,
const char *txn_id,
trail_t *trail,
apr_pool_t *pool)
{
base_fs_data_t *bfd = fs->fsap_data;
DBT query, result;
apr_size_t len;
char next_key[MAX_KEY_SIZE];
int db_err;
const char *next_node_id;
SVN_ERR_ASSERT(txn_id);
/* Get the current value associated with the `next-key' key in the table. */
svn_fs_base__str_to_dbt(&query, NEXT_KEY_KEY);
svn_fs_base__trail_debug(trail, "nodes", "get");
SVN_ERR(BDB_WRAP(fs, N_("allocating new node ID (getting 'next-key')"),
bfd->nodes->get(bfd->nodes, trail->db_txn,
&query,
svn_fs_base__result_dbt(&result),
0)));
svn_fs_base__track_dbt(&result, pool);
/* Squirrel away our next node id value. */
next_node_id = apr_pstrmemdup(pool, result.data, result.size);
/* Bump to future key. */
len = result.size;
svn_fs_base__next_key(result.data, &len, next_key);
svn_fs_base__trail_debug(trail, "nodes", "put");
db_err = bfd->nodes->put(bfd->nodes, trail->db_txn,
svn_fs_base__str_to_dbt(&query, NEXT_KEY_KEY),
svn_fs_base__str_to_dbt(&result, next_key),
0);
SVN_ERR(BDB_WRAP(fs, N_("bumping next node ID key"), db_err));
/* Create and return the new node id. */
*id_p = svn_fs_base__id_create(next_node_id, copy_id, txn_id, pool);
return SVN_NO_ERROR;
}
svn_error_t *svn_fs_bdb__reserve_rep_reuse_id(const char **id_p,
svn_fs_t *fs,
trail_t *trail,
apr_pool_t *pool)
{
base_fs_data_t *bfd = fs->fsap_data;
DBT query, result;
apr_size_t len;
char next_key[MAX_KEY_SIZE];
int db_err;
svn_fs_base__str_to_dbt(&query, NEXT_KEY_KEY);
/* Get the current value associated with the `next-key' key in the
`checksum-reps' table. */
svn_fs_base__trail_debug(trail, "checksum-reps", "get");
SVN_ERR(BDB_WRAP(fs, _("allocating new representation reuse ID "
"(getting 'next-key')"),
bfd->checksum_reps->get(bfd->checksum_reps, trail->db_txn,
&query,
svn_fs_base__result_dbt(&result),
0)));
svn_fs_base__track_dbt(&result, pool);
/* Set our return value. */
*id_p = apr_pstrmemdup(pool, result.data, result.size);
/* Bump to future key. */
len = result.size;
svn_fs_base__next_key(result.data, &len, next_key);
svn_fs_base__trail_debug(trail, "checksum_reps", "put");
db_err = bfd->checksum_reps->put(bfd->checksum_reps, trail->db_txn,
svn_fs_base__str_to_dbt(&query,
NEXT_KEY_KEY),
svn_fs_base__str_to_dbt(&result, next_key),
0);
return BDB_WRAP(fs, _("bumping next copy key"), db_err);
}
/* Allocate a Subversion transaction ID in FS, as part of TRAIL. Set
*ID_P to the new transaction ID, allocated in POOL. */
static svn_error_t *
allocate_txn_id(const char **id_p,
svn_fs_t *fs,
trail_t *trail,
apr_pool_t *pool)
{
base_fs_data_t *bfd = fs->fsap_data;
DBT query, result;
apr_size_t len;
char next_key[MAX_KEY_SIZE];
int db_err;
svn_fs_base__str_to_dbt(&query, NEXT_KEY_KEY);
/* Get the current value associated with the `next-key' key in the table. */
svn_fs_base__trail_debug(trail, "transactions", "get");
SVN_ERR(BDB_WRAP(fs, "allocating new transaction ID (getting 'next-key')",
bfd->transactions->get(bfd->transactions, trail->db_txn,
&query,
svn_fs_base__result_dbt(&result),
0)));
svn_fs_base__track_dbt(&result, pool);
/* Set our return value. */
*id_p = apr_pstrmemdup(pool, result.data, result.size);
/* Bump to future key. */
len = result.size;
svn_fs_base__next_key(result.data, &len, next_key);
svn_fs_base__str_to_dbt(&query, NEXT_KEY_KEY);
svn_fs_base__str_to_dbt(&result, next_key);
svn_fs_base__trail_debug(trail, "transactions", "put");
db_err = bfd->transactions->put(bfd->transactions, trail->db_txn,
&query, &result, 0);
return BDB_WRAP(fs, "bumping next transaction key", db_err);
}
