> On Feb 2, 2022, at 2:55 PM, Chuck Lever III <chuck.lever@xxxxxxxxxx> wrote: > > > >> On Feb 1, 2022, at 8:41 PM, Simon Kirby <sim@xxxxxxxxxx> wrote: >> >> How far off would we be from write delegations happening here? > > We are tracking a "feature request" for write delegation support > in the Linux NFS server: > > https://bugzilla.linux-nfs.org/show_bug.cgi?id=348 > > At this point the effort is not resourced. It's not clear how > much benefit it would be. > > That said, it seems to me that your use case might benefit if > the Linux NFS server offered a READ delegation for the SQLite > database file even when it is open R/W. It might be appropriate > if the server offered such a delegation when there are no other > clients that have the file open for write or that hold write > delegations. > > Patches and performance data are, as always, welcome. You didn't mention which version of the server you are using. In fact, commit aba2072f4523 ("nfsd: grant read delegations to clients holding writes") ought to make the server offer a READ delegation in this situation. It appears in v5.13, if I'm reading my "git describe" output correctly. -- Chuck Lever
