Function svn_fs_begin_txn 

pub unsafe extern "C" fn svn_fs_begin_txn(
    txn_p: *mut *mut svn_fs_txn_t,
    fs: *mut svn_fs_t,
    rev: svn_revnum_t,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

Same as svn_fs_begin_txn2(), but with @a flags set to 0.

@deprecated Provided for backward compatibility with the 1.1 API.