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Thu, 6 Aug 2020 13:46:45 -0400 (EDT) Date: Thu, 6 Aug 2020 13:46:45 -0400 From: Vivek Goyal To: "Dr. David Alan Gilbert" Subject: Re: [Virtio-fs] [PATCH] virtiofsd: Disable remote posix locks by default Message-ID: <20200806174645.GG367847@redhat.com> References: <20200727161841.GA54539@redhat.com> <20200806174129.GK2711@work-vm> MIME-Version: 1.0 In-Reply-To: <20200806174129.GK2711@work-vm> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vgoyal@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=63.128.21.124; envelope-from=vgoyal@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/06 13:48:01 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "misono.tomohiro@fujitsu.com" , virtio-fs-list , "qemu-devel@nongnu.org" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, Aug 06, 2020 at 06:41:29PM +0100, Dr. David Alan Gilbert wrote: > * misono.tomohiro@fujitsu.com (misono.tomohiro@fujitsu.com) wrote: > > > Right now we enable remote posix locks by default. That means when guest does a posix lock it sends request to server > > > (virtiofsd). But currently we only support non-blocking posix lock and return -EOPNOTSUPP for blocking version. > > > > > > This means that existing applications which are doing blocking posix locks get -EOPNOTSUPP and fail. To avoid this, > > > people have been running virtiosd with option "-o no_posix_lock". For new users it is still a surprise and trial and error > > > takes them to this option. > > > > > > Given posix lock implementation is not complete in virtiofsd, disable it by default. This means that posix locks will work > > > with-in applications in a guest but not across guests. Anyway we don't support sharing filesystem among different guests > > > yet in virtiofs so this should not lead to any kind of surprise or regression and will make life little easier for virtiofs users. > > > > > > Reported-by: Aa Aa > > > Suggested-by: Miklos Szeredi > > > Signed-off-by: Vivek Goyal > > > --- > > > tools/virtiofsd/passthrough_ll.c | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > We should update docs/tools/virtiofsd.rst as well. Given that: > > Reviewed-by: Misono Tomohiro > > Fixed up the doc. Aha.. Looks like we were looking at this at the same time. Thanks for taking care of this Dave. Vivek