Am 24.09.21 um 05:35 schrieb Trond Myklebust:
Not if you set the "kernel oplocks" parameter in the smb.conf file. We just added support for this in the Linux 5.14 kernel NFSv4 client. Now that said, "kernel oplocks" will currently only support basic level I oplocks, and cannot support level II or leases. According to the smb.conf manpage, this is due to some incompleteness in the current VFS lease implementation. I'd love to get some more info from the Samba team about what is missing from the kernel lease implementation that prevents us from implementing these more advanced oplock/lease features. From the description in Microsoft's docs, I'm pretty sure that NFSv4 delegations should be able to provide all the guarantees that are required.
leases can be shared among file handles. When someone requests a lease he passes a cookie. Then when he opens the same file with the same cookie the lease is not broken.
Maybe others can comment on the level II oplock problem. Afaik this was more a lack of testing.
-slow -- Ralph Boehme, Samba Team https://samba.org/ SerNet Samba Team Lead https://sernet.de/en/team-samba
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