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 3942D1E0B70; Thu, 17 Oct 2024 17:05:56 +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=1729184757; cv=none; b=badJLBQ3Mwz0wx2dfL6Oluk0EcFFfRjy8cow9pjtru5krtS/W9zx0HVIHS0aCVxETXAVlSgyiA6GGiAodYZ5KhxEbe12v5UiKD5gklxaZniEk0zR49l8MABXC2KiNf+HM0wXy4cDxl3fUInTFT59TfLpQNBQfVl/+Sg1dTRB9hw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729184757; c=relaxed/simple; bh=Hi6D8KVRTUMeLAnvMukvPh1ulybVUJ8y+rk+DUP+VPc=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=anTg7gaSDRGlcPcTl4LB0r3wSENwmjbZR3cL1bfh5Nbcc9vC4M9ZhePfqFlk1Em/qb3+i3x2EEOhrmCT+tUe6p1jVtQlsZ3/WstvEA30cOnXAyl6P/QL3ekyE0a6ALWgwykxFem/IalsLAhPU/wMT7WSysRrArHxrcLf6Zk/ddQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EqR+SY3Y; 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="EqR+SY3Y" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AB147C4AF0F; Thu, 17 Oct 2024 17:05:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729184756; bh=Hi6D8KVRTUMeLAnvMukvPh1ulybVUJ8y+rk+DUP+VPc=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=EqR+SY3YKbAH7x5UhQdz1sEp5ImzYJXcJQ2ZN2/+ywXAi4c1+QrwFpHfJ0rLBDE2K ZMLDcuNQa38guer1hl+0/2Qn71065nHoKHFOejD3r96zGkCgDJTvmzYn42cZNQslfA 25m7hSd5y32Wv2wiir2xlDgKSdZgN3I8Btg4Z8pJCAy7WKRlLJ83Wtsrr+kbDIszDH vJdZfRTMR2PW7L8MRo8foqPQpngxB+94VTpMwrKPj9+hpeRZ4WYW2o8ANtBLxl9KJf BJUT0hek6+Hul/goYhlx7fwM/HIRUYUbnFltuVSSYgynUHsXXl/JnVQL+u/EgOXktw Vu/+Ig3Dj4GUA== Message-ID: <5a5cfe8cb8155c2bb91780cc75816751213e28d7.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: Paul Moore , Christoph Hellwig Cc: Trond Myklebust , "brauner@kernel.org" , "jack@suse.cz" , "mic@digikod.net" , "linux-fsdevel@vger.kernel.org" , "anna@kernel.org" , "linux-security-module@vger.kernel.org" , "audit@vger.kernel.org" , "linux-nfs@vger.kernel.org" , "viro@zeniv.linux.org.uk" Date: Thu, 17 Oct 2024 13:05:54 -0400 In-Reply-To: References: <20241010152649.849254-1-mic@digikod.net> <20241016-mitdenken-bankdaten-afb403982468@brauner> <5bbddc8ba332d81cbea3fce1ca7b0270093b5ee0.camel@hammerspace.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw 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Evolution 3.52.4 (3.52.4-1.fc40) Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2024-10-17 at 11:15 -0400, Paul Moore wrote: > On Thu, Oct 17, 2024 at 10:58=E2=80=AFAM Christoph Hellwig wrote: > > On Thu, Oct 17, 2024 at 10:54:12AM -0400, Paul Moore wrote: > > > Okay, good to know, but I was hoping that there we could come up with > > > an explicit list of filesystems that maintain their own private inode > > > numbers outside of inode-i_ino. > >=20 > > Anything using iget5_locked is a good start. Add to that file systems > > implementing their own inode cache (at least xfs and bcachefs). >=20 > Also good to know, thanks. However, at this point the lack of a clear > answer is making me wonder a bit more about inode numbers in the view > of VFS developers; do you folks care about inode numbers? I'm not > asking to start an argument, it's a genuine question so I can get a > better understanding about the durability and sustainability of > inode->i_no. If all of you (the VFS folks) aren't concerned about > inode numbers, I suspect we are going to have similar issues in the > future and we (the LSM folks) likely need to move away from reporting > inode numbers as they aren't reliably maintained by the VFS layer. >=20 Like Christoph said, the kernel doesn't care much about inode numbers. People care about them though, and sometimes we have things in the kernel that report them in some fashion (tracepoints, procfiles, audit events, etc.). Having those match what the userland stat() st_ino field tells you is ideal, and for the most part that's the way it works. The main exception is when people use 32-bit interfaces (somewhat rare these days), or they have a 32-bit kernel with a filesystem that has a 64-bit inode number space (NFS being one of those). The NFS client has basically hacked around this for years by tracking its own fileid field in its inode. That's really a waste though. That could be converted over to use i_ino instead if it were always wide enough. It'd be better to stop with these sort of hacks and just fix this the right way once and for all, by making i_ino 64 bits everywhere. A lot of the changes can probably be automated via coccinelle. I'd probably start by turning all of the direct i_ino accesses into static inline wrapper function calls. The hard part will be parceling out that work into digestable chunks. If you can avoid "flag day" changes, then that's ideal. You'd want a patch per subsystem so you can collect ACKs.=20 The hardest part will probably be the format string changes. I'm not sure you can easily use coccinelle for that, so that may need to be done by hand or scripted with python or something. --=20 Jeff Layton