Bug #40284
Updated by Patrick Donnelly over 3 years ago
ceph-fuse now supports lazyio [2, #20598] but I don't believe we ever checked what needed to be done for the kernel client. Also, I got a question from Dan @ CERN about how lazyio interacts with the page cache (or for ceph-fuse, the osdc cache). In particular, if a client 1 reads some file blocks and another client 2 updates those blocks, how does client 1 expire its page cache? Does it need to reopen the file? It seems we're missing the lazyio_propagate/lazyio_synchronize interfaces to resolve this which do exist in the Client userspace library [1], but untested (#40283). Targeting v15.0.0 just so this ticket is visible in searches. [1] http://www.pdsw.org/pdsw09/resources/pdsw-pnfsmpiio-hildebrand-public.pdf [2] https://github.com/ceph/ceph/pull/22450