From: Christoph Hellwig <hch@lst.de>
To: Dai Ngo <dai.ngo@oracle.com>
Cc: Chuck Lever <chuck.lever@oracle.com>,
jlayton@kernel.org, neilb@ownmail.net, okorniev@redhat.com,
tom@talpey.com, hch@lst.de, alex.aring@gmail.com,
viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz,
linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org
Subject: Re: [PATCH v4 3/3] FSD: Fix NFS server hang when there are multiple layout conflicts
Date: Wed, 19 Nov 2025 11:05:26 +0100 [thread overview]
Message-ID: <20251119100526.GA25962@lst.de> (raw)
In-Reply-To: <18135047-8695-4190-b7ca-b7575d9e4c6c@oracle.com>
On Mon, Nov 17, 2025 at 11:40:22AM -0800, Dai Ngo wrote:
>> If a .fence_client callback is optional for a layout to provide,
>> timeouts for such layout types won't trigger any fencing action. I'm not
>> certain yet that's good behavior.
>
> Some layout implementation is in experimental state such as block
> layout and should not be used in production environment. I don't
> know what should we do for that case. Does adding a trace point to
> warn the user sufficient?
The block layout isn't really experimental, but really a broken protocol
because there is no way to even fence a client except when there is
a side channel mapping between the client identities for NFS and the
storage protocol.
I'd be all in favour of deprecating the support ASAP and then removing
it aggressively.
next prev parent reply other threads:[~2025-11-19 10:05 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-15 19:16 [Patch v4 0/3] NFSD: Fix server hang when there are multiple layout conflicts Dai Ngo
2025-11-15 19:16 ` [PATCH v4 1/3] locks: Introduce lm_breaker_timedout operation to lease_manager_operations Dai Ngo
2025-11-17 15:39 ` Chuck Lever
2025-11-17 19:17 ` Dai Ngo
2025-11-17 18:02 ` Jeff Layton
2025-11-17 19:41 ` Dai Ngo
2025-11-19 13:52 ` Jeff Layton
2025-11-19 16:32 ` Dai Ngo
2025-11-19 9:54 ` Christoph Hellwig
2025-11-19 14:04 ` Chuck Lever
2025-11-15 19:16 ` [PATCH v4 2/3] locks: Threads with layout conflict must wait until client was fenced Dai Ngo
2025-11-17 15:47 ` Chuck Lever
2025-11-17 19:21 ` Dai Ngo
2025-11-17 18:21 ` Jeff Layton
2025-11-17 19:49 ` Dai Ngo
2025-11-19 9:53 ` Christoph Hellwig
2025-11-15 19:16 ` [PATCH v4 3/3] FSD: Fix NFS server hang when there are multiple layout conflicts Dai Ngo
2025-11-15 19:44 ` Chuck Lever
2025-11-15 20:20 ` Dai Ngo
2025-11-19 9:56 ` Christoph Hellwig
2025-11-19 16:35 ` Dai Ngo
2025-11-17 15:55 ` Chuck Lever
2025-11-17 19:40 ` Dai Ngo
2025-11-17 21:13 ` Benjamin Coddington
2025-11-17 22:00 ` Dai Ngo
2025-11-19 10:08 ` Christoph Hellwig
2025-11-19 16:52 ` Dai Ngo
2025-11-20 6:50 ` Christoph Hellwig
2025-11-19 10:05 ` Christoph Hellwig [this message]
2025-11-19 14:04 ` Benjamin Coddington
2025-11-19 14:09 ` Chuck Lever
2025-11-19 14:12 ` Jeff Layton
2025-11-19 17:06 ` Dai Ngo
2025-11-20 6:52 ` Christoph Hellwig
2025-11-20 6:59 ` Christoph Hellwig
2025-11-19 9:57 ` Christoph Hellwig
2025-11-19 10:08 ` Christoph Hellwig
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