This may, on its face, sound like a stupid question, but I'm going over the rules to ensure that our cap handling rules will be able to properly support buffered creates/unlinks. Dentry leases seem to be really poorly documented. The "rules" for them are unclear, but also the rationale. What was the supposed benefit of the dentry leases in ceph over just relying on appropriate caps on the parent directory? In principle I suppose it would allow you to continue caching most of your dentries when only some small subset changes. Was that it or was there some other reason to add them? If that was the reason, what was the rationale for making them time- based (they all have a lease_ttl)? -- Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
