7:14 a.m.
Is will try, but there's no guarantee, as FDs on entries that are ref'd
will be skipped. So, ongoing traffic can mean that there's never one
time when all FDs are guaranteed to be closed. In addition, it's
non-deterministic, so the FS would need some way to detect that all FDs
are closed, you couldn't just trigger it.
Daniel
On 12/22/20 12:38 AM, Malahal Naineni wrote:
I thought setting the low percentage (FD_LWMark_Percent) to zero
makes
it close all anonymous fds periodically. Also, Madhu from IBM has a
patch with a config setting where NFS-Ganesha opens and closes
temp/anonympus fds without caching them at all. You may hit a perf hit
for not cashing fds based on your FSAL/fs implementation though.
On Mon, Dec 21, 2020 at 7:18 PM Daniel Gryniewicz <dang(a)redhat.com
<mailto:dang@redhat.com>> wrote:
Okay, I understand the reasoning. This is inherently impossible with
NFSv4, since the protocol specification itself requires that FDs remain
open as long as the client is using them. Similarly, it's impossible
with any kind of locking (either NFSv3 or NFSv4), since, on linux, you
must keep your FD open for the lock to continue to exist.
For straight, non-locking NFSv3, it's possible, but it's not currently
implemented. The FD closing threads in Ganesha are not designed to
close all anonymous FDs, but rather to keep the number of open
anonymous
FDs low. Work could be done to close them all, but no code exists
currently.
Daniel
On 12/19/20 11:45 AM, gershon geva wrote:
> Hi Daniel,
>
> We run Ganesha on top of our proprietary filesystem WekaFS. Some
of our filesystem background cleanup tasks requires that all FDs on
a given export be closed. Our current NFS implementation closes all
open anonymous FDs after a pre-configured time period and allow
those tasks to run when the NFS activity is relatively idle. We wish
to have more or less the same behavior with Ganesha.
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