> My plan is (when I get time) to make the writeback journal work. An entry > recorded in this will be allowed to pin a cachefs data file on disc. A netfs > will be able to ask for an enumeration of the wbj entries that belong to it, > and will be notified upon the attachment of a cookie to a pinned data file. > > The netfs would then be permitted to ask fscache to record or remove a > writeback mark against a file. Does this have to have file granurality? Is pinning individual pages not possible? > Actually, the reverse approach might be easier - allowing the > swapper to make use of slack space in cachefs. That sounds good too. But optimally swap would have a higher priority, so for example cached data should be thrown away when the OOM killer would be invoked otherwise. Miklos
