int ftfs_directory_is_empty(DB *meta_db, struct ftfs_meta_key *meta_key,
DB_TXN *txn, int *is_empty)
{
int ret, r;
struct ftfs_meta_key *start_meta_key;
struct ftfs_die_cb_info info;
DBT key;
DBC *cursor;
start_meta_key = alloc_child_meta_key_from_meta_key(meta_key, "");
if (!start_meta_key)
return -ENOMEM;
dbt_init(&key, start_meta_key, SIZEOF_KEY(*start_meta_key));
ret = meta_db->cursor(meta_db, txn, &cursor, DB_CURSOR_FLAGS);
if (ret)
goto out;
info.meta_key = meta_key;
info.is_empty = is_empty;
ret = cursor->c_getf_set_range(cursor, 0, &key, ftfs_die_cb, &info);
if (ret == DB_NOTFOUND) {
ret = 0;
*is_empty = 1;
}
r = cursor->c_close(cursor);
BUG_ON(r);
out:
meta_key_free(start_meta_key);
return ret;
}
int ftfs_bstore_scan_pages(DB *data_db, struct ftfs_meta_key *meta_key,
DB_TXN *txn, struct ftio *ftio)
{
int ret, r;
uint64_t block_num;
struct ftfs_scan_pages_cb_info info;
struct ftfs_data_key *data_key, *prefetch_data_key;
DBT key_dbt, prefetch_key_dbt;
DBC *cursor;
if (ftio_job_done(ftio))
return 0;
block_num = ftio_current_page(ftio)->index;
data_key = alloc_data_key_from_meta_key(meta_key, block_num);
if (!data_key)
return -ENOMEM;
block_num = ftio_last_page(ftio)->index;
prefetch_data_key = alloc_data_key_from_meta_key(meta_key, block_num);
if (!prefetch_data_key) {
ret = -ENOMEM;
goto out;
}
dbt_init(&key_dbt, data_key, SIZEOF_KEY(*data_key));
dbt_init(&prefetch_key_dbt, prefetch_data_key, SIZEOF_KEY(*prefetch_data_key));
ret = data_db->cursor(data_db, txn, &cursor, DB_CURSOR_FLAGS);
if (ret)
goto free_out;
ret = cursor->c_set_bounds(cursor, &key_dbt, &prefetch_key_dbt, true, 0);
if (ret)
goto close_cursor;
info.meta_key = meta_key;
info.ftio = ftio;
r = cursor->c_getf_set_range(cursor, 0, &key_dbt, ftfs_scan_pages_cb, &info);
while (info.do_continue && !r)
r = cursor->c_getf_next(cursor, 0, ftfs_scan_pages_cb, &info);
if (r && r != DB_NOTFOUND)
ret = r;
if (!ret)
ftfs_bstore_fill_rest_page(ftio);
close_cursor:
r = cursor->c_close(cursor);
BUG_ON(r);
free_out:
data_key_free(prefetch_data_key);
out:
data_key_free(data_key);
return ret;
}
void IndexCursor::setPosition(const BSONObj &key, const BSONObj &pk) {
TOKULOG(3) << toString() << ": setPosition(): getf " << key << ", pk " << pk << ", direction " << _direction << endl;
// Empty row buffer, reset fetch iteration, go get more rows.
_buffer.empty();
_getf_iteration = 0;
storage::Key sKey( key, !pk.isEmpty() ? &pk : NULL );
DBT key_dbt = sKey.dbt();;
int r;
const int rows_to_fetch = getf_fetch_count();
struct cursor_getf_extra extra(&_buffer, rows_to_fetch);
DBC *cursor = _cursor.dbc();
if ( forward() ) {
r = cursor->c_getf_set_range(cursor, getf_flags(), &key_dbt, cursor_getf, &extra);
} else {
r = cursor->c_getf_set_range_reverse(cursor, getf_flags(), &key_dbt, cursor_getf, &extra);
}
if ( extra.ex != NULL ) {
throw *extra.ex;
}
if (r == TOKUDB_INTERRUPTED) {
_interrupt_extra.throwException();
}
if ( r != 0 && r != DB_NOTFOUND ) {
extra.throwException();
storage::handle_ydb_error(r);
}
_getf_iteration++;
_ok = extra.rows_fetched > 0 ? true : false;
if ( ok() ) {
getCurrentFromBuffer();
}
TOKULOG(3) << "setPosition hit K, PK, Obj " << _currKey << _currPK << _currObj << endl;
}