linux-kernel - Re: [PATCH v2 2/3] NFSD: Fix last write offset handling in layoutcommit

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Message-ID: <aHeJ9zBd3msrwOGf@infradead.org>
Date: Wed, 16 Jul 2025 04:16:07 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Sergey Bashirov <sergeybashirov@...il.com>
Cc: Chuck Lever <chuck.lever@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	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 2/3] NFSD: Fix last write offset handling in
 layoutcommit

On Tue, Jul 15, 2025 at 06:32:19PM +0300, Sergey Bashirov wrote:
> The data type of loca_last_write_offset is newoffset4 and is switched
> on a boolean value, no_newoffset, that indicates if a previous write
> occurred or not. If no_newoffset is FALSE, an offset is not given.
> This means that client does not try to update the file size. Thus,
> server should not try to calculate new file size and check if it fits
> into the segment range. See RFC 8881, section 12.5.4.2.
> 
> Sometimes the current incorrect logic may cause clients to hang when
> trying to sync an inode. If layoutcommit fails, the client marks the
> inode as dirty again.
> 
> Fixes: 9cf514ccfacb ("nfsd: implement pNFS operations")
> 
> Co-developed-by: Konstantin Evtushenko <koevtushenko@...dex.com>

Nit: The tag should directly follow the Fixes line without whitespaces.

Otherwise looks good:

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