trans/fakeroot: rework node caching

Instead of the FAKE_REFERENCE flag, rework node caching so that nodes are
retained only if their attributes are actually changed. In addition, don't
remove unreferenced nodes from the hash table at protid release, since
their reference counter is unstable. Do it on node destruction, once the
reference counter has reached 0. This means lookups can return nodes not
referenced (other than by the hash table), a condition for which a check
is added. By never acquiring a reference on such nodes, their counter is
guaranteed to remain stable once unreferenced.

* trans/fakeroot.c (FAKE_REFERENCE): Remove macro.
(FAKE_DEFAULT): New macro.
(set_default_attributes): New function.
(set_faked_attribute): Likewise.
(netfs_node_norefs): Remove node from hash table, properly taking care
of all the locks involved.
(fakeroot_netfs_release_protid): Remove node handling code, merely call
netfs_release_protid.
(netfs_S_dir_lookup): Handle unreferenced nodes, call set_default_attributes
on node creation, remove call to netfs_attempt_chown.
(netfs_attempt_chown): Call set_faked_attribute instead of accessing faked
flags directly.
(netfs_attempt_chauthor): Likewise.
(netfs_attempt_chmod): Likewise.
(main): Likewise.

0 files changed, 0 insertions, 0 deletions