On Mon, Feb 07, 2022 at 08:36:21AM -0800, Paul E. McKenney wrote: > On Mon, Feb 07, 2022 at 08:30:03AM -0500, Brian Foster wrote: > Another approach is to use SLAB_TYPESAFE_BY_RCU. This allows immediate > reuse of freed memory, but also requires pointer traversals to the memory > to do a revalidation operation. (Sorry, no free lunch here!) Can't do that with inodes - newly allocated/reused inodes have to go through inode_init_always() which is the very function that causes the problems we have now with path-walk tripping over inodes in an intermediate re-initialised state because we recycled it inside a RCU grace period. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx
