Jeff Layton <jlayton@xxxxxxxxxx> wrote: > Given the indexing changes, what sort of behavior should we expect when > upgrading from old-style to new-style indexes? Do they just not match, > and we end up downloading new copies of all the data and the old stale > stuff eventually gets culled? Correct: they don't match. The names of the directories and files will be quite different - and so will the attached xattrs. However, no filesystems currently store locally-modified data in the cache, so you shouldn't lose any data after upgrading. > Ditto for downgrades -- can we expect sane behavior if someone runs an > old kernel on top of an existing fscache that was populated by a new > kernel? Correct. With this branch, filesystems now store locally-modified data into the cache - but they also upload it to the server at the same time. If there's a disagreement between what's in the cache and what's on the server with this branch, the cache is discarded, so simply discarding the cache on a download shouldn't be a problem. It's currently operating as a write-through cache, not a write-back cache. That will change if I get round to implementing disconnected operation, but it's not there yet. David
