3:25 p.m.
Jeremy Allison wrote:
On Wed, Mar 06, 2019 at 03:31:08PM -0500, Jeff Layton wrote:
> On Wed, 2019-03-06 at 10:11 -0500, J. Bruce Fields wrote:
>>
>> Jeff, wasn't there some work (on Ceph maybe?) on a userspace delegation
>> API? Is that close to what's needed?
>>
>
> Here's the C headers for that stuff:
>
>
https://github.com/ceph/ceph/blob/7ba6bece4187eda5d05a9b84211fe6ba8dd287b...
>
> It's simple enough and works for us in ganesha, and I think we can
> probably adapt it to samba without too much difficulty. The callback
> doesn't seem like it'll do for a kernel API though -- you'd almost
> certainly need to do something different there (signals? inotify?).
SMB3 leases have R/RW and Handle-based leases.
Just to be precise: SMB2.1+ has R, RH, RW and RWH leases.
Handle leases allow multiple opens of the same pathname
that get different handles to share the lease, allowing
a client redirector to delay opens or closes locally
so long as it has a handle lease.
That'a a propertly of leases in general, not just H-leases. The client provides a
lease key which is a GUID with each lease request
Here are the semantics:
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-smb2/d8df...
I'm not sure a simple file-descriptor based API is
enough for us. Can he have a uuid or token based
API instead where the server can chose what fd's
to cover with a token ?
Yes, that would be ideal.
-slow