Function svn_fs_set_access 

pub unsafe extern "C" fn svn_fs_set_access(
    fs: *mut svn_fs_t,
    access_ctx: *mut svn_fs_access_t,
) -> *mut svn_error_t

Associate @a access_ctx with an open @a fs.

This function can be run multiple times on the same open filesystem, in order to change the filesystem access context for different filesystem operations. Pass a NULL value for @a access_ctx to disassociate the current access context from the filesystem.