From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D09330F819; Tue, 31 Mar 2026 17:09:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774976972; cv=none; b=FqVGoZcQrIp5e4XOsqH1+MYYq3smJJlgwQ09R0iQ19NxtHrP+UOgGku9BdbO6QngmQETYuY7Bhs3eCebvU1TIHzzwsw3EYRP2G5Tji3m3ljP/1VCxeNRrIme8sGJKlnoLQIkdYP78Fvui75DolAOokTEHgwgNzX8LqmTZPrh4AY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774976972; c=relaxed/simple; bh=5gYU4EQcgP+RWXRqsC+0Fs8VjMapzBDpbwF98NmvEaY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=FEryZ2nPYypPk8uPnDVxJW9afSDWkxWft6jollJKR1rpWbo8tE1ezVxYblF2PxfkQfYaf5MrNu8iUPy7DiSwGhpXF7zWwTNwD+wUZOQcIuWG+xMZcFRI7o4dmktIVviq5SbcdoOPB4VtKH/2JpH5twyWTKhH2zKAGKoRlIm1OsQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iYMOVdYp; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="iYMOVdYp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 67048C19423; Tue, 31 Mar 2026 17:09:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774976972; bh=5gYU4EQcgP+RWXRqsC+0Fs8VjMapzBDpbwF98NmvEaY=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=iYMOVdYpJmWPBv12xUtPpnYfp/uND4u4R4korCSVfzZe0Ng6nSyYA1cFBOWGlxTVn hW2So/dLWQHDT7gvaQIzTxJixxMIU8/qVISBaGzMeddGhgcxiSMnpBdjMNJoRrqLSs KQe9en40tZKCUNCW/DzU1BdQjgTAWK/SCvy+8TOG8BpzwWEWZngfGcH2AYlNEuCaUC +XK/iiN7q8duhsH0CVi7+SHtDTSvE4YOyJKZC13Di5NDhp5q3+phY1X/A660DQP1+G lIiJKC38/s1iyb6R6tOxcY+fDCXSA6TKwtXyvD1XhP4iqxd9XxnZLqQTLJovFkgT7Q smtnenk+mlcaw== Message-ID: <47bf9653ce304f973cef6248e10a7dba4d958140.camel@kernel.org> Subject: Re: [PATCH 1/4] nfsd/blocklayout: always ignore loca_time_modify From: Jeff Layton To: Christoph Hellwig , Chuck Lever , Amir Goldstein Cc: NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Date: Tue, 31 Mar 2026 13:09:28 -0400 In-Reply-To: <20260331153406.4049290-2-hch@lst.de> References: <20260331153406.4049290-1-hch@lst.de> <20260331153406.4049290-2-hch@lst.de> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Tue, 2026-03-31 at 17:33 +0200, Christoph Hellwig wrote: > RFC 8881 Section 18.42 makes it clear that the client provided timestamp > is a "may" condition, and clients that want to force a specific timestamp > should send a separate SETATTR in the compound. >=20 > Since commit b82f92d5dd1a ("fs: have setattr_copy handle multigrain > timestamps appropriately") the ia_mtime value is ignored by file > systems using multi-grain timestamps like XFS, which is the only > file system supporting blocklayout exports right now, so make that > explicit in NFSD as well. >=20 > Signed-off-by: Christoph Hellwig > --- > fs/nfsd/blocklayout.c | 15 ++++++++++----- > 1 file changed, 10 insertions(+), 5 deletions(-) >=20 > diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c > index a7cfba29990e..5ee5735b39bb 100644 > --- a/fs/nfsd/blocklayout.c > +++ b/fs/nfsd/blocklayout.c > @@ -179,15 +179,20 @@ static __be32 > nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit= *lcp, > struct iomap *iomaps, int nr_iomaps) > { > - struct timespec64 mtime =3D inode_get_mtime(inode); > struct iattr iattr =3D { .ia_valid =3D 0 }; > int error; > =20 > - if (lcp->lc_mtime.tv_nsec =3D=3D UTIME_NOW || > - timespec64_compare(&lcp->lc_mtime, &mtime) < 0) > - lcp->lc_mtime =3D current_time(inode); > + /* > + * This ignores the client provided mtime in loca_time_modify, as a > + * fully client specified mtime doesn't really fit into the Linux > + * multi-grain timestamp architecture. > + * > + * RFC 8881 Section 18.42 makes it clear that the client provided > + * timestamp is a "may" condition, and clients that want to force a > + * specific timestamp should send a separate SETATTR in the compound. > + */ > iattr.ia_valid |=3D ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; > - iattr.ia_atime =3D iattr.ia_ctime =3D iattr.ia_mtime =3D lcp->lc_mtime; > + iattr.ia_atime =3D iattr.ia_ctime =3D iattr.ia_mtime =3D current_time(i= node); Technically, these fields are completely ignored by notify_change, unless their counterpart ATTR_?TIME_SET flag is set, so you could just leave them unset. =20 > =20 > if (lcp->lc_size_chg) { > iattr.ia_valid |=3D ATTR_SIZE; Reviewed-by: Jeff Layton