When nfsd starts requesting directory delegations, setlease handlers may see requests for leases on directories. Push the !S_ISREG check down into the non-trivial setlease handlers, so we can selectively enable them where they're supported. FUSE is special: It's the only filesystem that supports atomic_open and allows kernel-internal leases. atomic_open is issued when the VFS doesn't know the state of the dentry being opened. If the file doesn't exist, it may be created, in which case the dir lease should be broken. The existing kernel-internal lease implementation has no provision for this. Ensure that we don't allow directory leases by default going forward by explicitly disabling them there. Reviewed-by: NeilBrown <neil@brown.name> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Jeff Layton <jlayton@kernel.org> Link: https://patch.msgid.link/20251111-dir-deleg-ro-v6-4-52f3feebb2f2@kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org>