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 77DB96EB4A; Sun, 13 Oct 2024 10:17:46 +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=1728814666; cv=none; b=n714xnuvOiTrpRGJK2S4Ebf3xKwn8YAOs1A2KsmhLibs0QPnaATVki8rfs8fFlMyfzmdzRVqnPsg0UhZVaNlW8qu+6Ok9DtyaHLMRjIFefzhCxb9tfVjFKHSg39TzHB09vYgdCOgShXYZp9catGkphMEumwkpIJBJ9XbRPx0Itg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728814666; c=relaxed/simple; bh=5nSOxXXZgFsZDq3IroaVosM7x8jRNeBekbSkhi0mlHs=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=T1hUwER/gu5GMMeZ1V0aYHfAqBdIoc4bnS0USV29R7CMjtY+oTur/zTMLuo9sG22OQ4WT/Kd3t4Fx0VFI4vZyYJFVmlq2hIy9fNB9vzdB9mnYXgas4R6PCPjR9hmwTAgfGGrjo2ISChYQBoPsTO2ktkQaOGe+kEbj5+Ravj4koQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DpAUftCQ; 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="DpAUftCQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DBB3DC4CEC5; Sun, 13 Oct 2024 10:17:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728814665; bh=5nSOxXXZgFsZDq3IroaVosM7x8jRNeBekbSkhi0mlHs=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=DpAUftCQakX/N3QBnBmmHbLRmEpwn/HXZt9Gpy5Mq+1ju4zEDuR6OIf1CQsU9SQgm 2xroY8vMpZMV3wt/to6R9mwCT1IE9yPa8UDI3pT7G1ZxB4m7EWQMPi5k7I3c5DQusa jIEuaKgw+iFwjys2+Z8fq1fkbnG7Y0jF0Orj41FR9du7pEwJHj3+a4bMiOqZa90mXh 9lhifchuu29EcvU2ENvoTVfaGHnRmjrvh5bJ8QZiESVjl0YefXWHPfQvMar6QcaDhS /zwvOkK/7D2ic+6+SFg96xK5rxNJQPfAUW0ByUXeJV4rMswY9AvdqI3RIJlv7bfLMC WG0bh//K5g8fw== Message-ID: <05cb94c0dda9e1b23fe566c6ecd71b3d1739b95b.camel@kernel.org> Subject: Re: [RFC PATCH v1 1/7] fs: Add inode_get_ino() and implement get_ino() for NFS From: Jeff Layton To: =?ISO-8859-1?Q?Micka=EBl_Sala=FCn?= , Christoph Hellwig Cc: Christian Brauner , Paul Moore , linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-security-module@vger.kernel.org, audit@vger.kernel.org, Trond Myklebust , Anna Schumaker , Alexander Viro , Jan Kara Date: Sun, 13 Oct 2024 06:17:43 -0400 In-Reply-To: <20241011.uu1Bieghaiwu@digikod.net> References: <20241010152649.849254-1-mic@digikod.net> <20241011.ieghie3Aiye4@digikod.net> <20241011.yai6KiDa7ieg@digikod.net> <20241011.aetou9haeCah@digikod.net> <20241011.uu1Bieghaiwu@digikod.net> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.4 (3.52.4-1.fc40app2) Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2024-10-11 at 17:30 +0200, Micka=C3=ABl Sala=C3=BCn wrote: > On Fri, Oct 11, 2024 at 07:39:33AM -0700, Christoph Hellwig wrote: > > On Fri, Oct 11, 2024 at 03:52:42PM +0200, Micka=C3=ABl Sala=C3=BCn wrot= e: > > > > > Yes, but how do you call getattr() without a path? > > > >=20 > > > > You don't because inode numbers are irrelevant without the path. > > >=20 > > > They are for kernel messages and audit logs. Please take a look at t= he > > > use cases with the other patches. > >=20 > > It still is useless. E.g. btrfs has duplicate inode numbers due to > > subvolumes. >=20 > At least it reflects what users see. >=20 > >=20 > > If you want a better pretty but not useful value just work on making > > i_ino 64-bits wide, which is long overdue. >=20 > That would require too much work for me, and this would be a pain to > backport to all stable kernels. >=20 Would it though? Adding this new inode operation seems sub-optimal. Inode numbers are static information. Once an inode number is set on an inode it basically never changes. This patchset will turn all of those direct inode->i_ino fetches into a pointer chase for the new inode operation, which will then almost always just result in a direct fetch. A better solution here would be to make inode->i_ino a u64, and just fix up all of the places that touch it to expect that. Then, just ensure that all of the filesystems set it properly when instantiating new inodes. Even on 32-bit arch, you likely wouldn't need a seqcount loop or anything to fetch this since the chance of a torn read there is basically zero. If there are places where we need to convert i_ino down to 32-bits, then we can just use some scheme like nfs_fattr_to_ino_t(), or just cast i_ino to a u32. Yes, it'd be a larger patchset, but that seems like it would be a better solution. --=20 Jeff Layton