linux-kernel - Re: [PATCH v2] NFSD: Disallow layoutget during grace period

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Message-ID: <aLki9rH7p13PPiRy@infradead.org>
Date: Wed, 3 Sep 2025 22:26:14 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Sergey Bashirov <sergeybashirov@...il.com>
Cc: Chuck Lever <chuck.lever@...cle.com>, Jeff Layton <jlayton@...nel.org>,
	NeilBrown <neil@...wn.name>,
	Olga Kornievskaia <okorniev@...hat.com>,
	Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey <tom@...pey.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Konstantin Evtushenko <koevtushenko@...dex.com>
Subject: Re: [PATCH v2] NFSD: Disallow layoutget during grace period

On Wed, Sep 03, 2025 at 10:34:24PM +0300, Sergey Bashirov wrote:
> When the block/scsi layout server is recovering from a reboot and is in a
> grace period, any operation that may result in deletion or reallocation of
> block extents should not be allowed. See RFC 8881, section 18.43.3.
> 
> If multiple clients write data to the same file, rebooting the server
> during writing can result in the file corruption. Observed this behavior
> while testing pNFS block volume setup.

Looks good:

Reviewed-by: Christoph Hellwig <hch@....de>