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 740A8226D02 for ; Mon, 10 Mar 2025 12:12:28 +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=1741608748; cv=none; b=mzl68+zXoh9Hl5MOo53GXXvc5WrmD4IS4ANF37LdXEYr8Ub7KrcZ44/EnlYmbnxHDdNzUcJ6duna3tQHBk/0w64vvaKyeBswbOSsopPd153XOtot3VSU65wONgVOG7RT3NKwmuYGEsg/PdnlFnqtz2gIG73/k/WY7Ihh4N99ZqU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741608748; c=relaxed/simple; bh=cVlWc26GZpGyYrwIKYW75tRjAQZt5Hz1vnG8jmAF0O4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=soHgPv82lHEAuwqD5DhvOV6IjacdeY7Q9fIgDUg6RbVJ/Ao5WlprUTJgdT17qKWB2SLsfDAnjtjobKNNdyDgEa4O8uRyqSc46H3GXsA5M3g6IJpEXjPfEVI5ECi/8ZxOkNTidmrDTzpq1xYDbWkgZU9BF3z9k4ST9wNq9C9S+Oo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bNm+uUpV; 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="bNm+uUpV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A1324C4CEE5; Mon, 10 Mar 2025 12:12:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741608747; bh=cVlWc26GZpGyYrwIKYW75tRjAQZt5Hz1vnG8jmAF0O4=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=bNm+uUpVbpwjy2dm4Nt7VKEoHpZGIV4bBBU2FWUTeXfQnleFCurPcAe+sta1763PU 9Fe3EPeHOxhxrc+grahysXotKZDWuHxLIL6fyHo9hhujDz9zUBK0rX9duSgnfVlqBa 50KBVFSblWqQKFwJXDg22NPlBbXTv256fa9utUyRbG+JFGYMAdalfBlDWGFaTbB0uZ bT+mof3aJ+H3gwXFqiunanQOnZQ2kdeEvv3c5/Kzkr8N6ngq9bP7vvknZ4vd3/iF74 5HnZZDdFHn4jxZZ8HJY8ST6zETLd3jUCfZO8muicTMadIJAQkkLSeDGpxnwuYWOh+T tPlX3ynY0LA+w== Message-ID: Subject: Re: [PATCH] utils/mount/nfs.man: add noalignwrite From: Jeff Layton To: Dan Aloni , steved@redhat.com Cc: linux-nfs@vger.kernel.org Date: Mon, 10 Mar 2025 08:12:26 -0400 In-Reply-To: <20250310120414.2515090-1-dan.aloni@vastdata.com> References: <20250310120414.2515090-1-dan.aloni@vastdata.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn 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eab4692a87de..744411688641 100644 > --- a/utils/mount/nfs.man > +++ b/utils/mount/nfs.man > @@ -618,6 +618,17 @@ option is not specified, > the default behavior depends on the kernel version, > but is usually equivalent to > .BR "xprtsec=3Dnone" . > +.TP 1.5i > +.BI noalignwrite > +This option disables the default behavior of extending write operations = to full > +page boundaries. > +.IP > +Normally, the NFS client rounds non-aligned writes up to the system page= size, Isn't that only true for buffered writes? That should probably be made clear if so. > +which can lead to "lost writes" when multiple clients write concurrently > +to distinct non-overlapping regions. Use this option when your > +applications perform non-aligned writes and you can guarantee that file > +regions do not overlap, thus avoiding the need for file locking. > +.IP > .SS "Options for NFS versions 2 and 3 only" > Use these options, along with the options in the above subsection, > for NFS versions 2 and 3 only. --=20 Jeff Layton