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 D92B445038; Fri, 27 Feb 2026 11:52:31 +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=1772193152; cv=none; b=j4mlim7iVqodht0c+t4LM/+7ijfYf3vi5QSg6z1xWPV5+0Cncov3AenEOcphHB6p4wmlhGWEWHLU0EN4/8p/4Cz31mmm4BKc3d/vN+vY87nBN60AeD84wfofQwJQM8ah8Z26pLHRfQwg1OJQ7iTalaYNyHyQi1wcf7UYOY3yusA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772193152; c=relaxed/simple; bh=AHIu6hmZ25K7bmjnXab9d2i3pQnGSr88KkWt5FGz11I=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=JSZMy7Enc06cRPbLp0ndWceDGURtGvPsYLI0QnjGvnAs5tPKnByJibfwYZ3187lClvvxf3RZfGrOV5XrmknjJlx4i2GCa+oWMmmS/7XmQXP22E0RZh4zY9Q/EyQ12J13hzBH5NZBSY+KFrTzoj5k7WJILYGw3MWkRbZXuK+CVCc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=diZXoxwf; 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="diZXoxwf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DBFF4C116C6; Fri, 27 Feb 2026 11:52:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772193151; bh=AHIu6hmZ25K7bmjnXab9d2i3pQnGSr88KkWt5FGz11I=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=diZXoxwffaidus7MxAp1Eyu5/08SuGQlJYylv7Tw2kSa+99BefT8wuBY5c7K+J8d/ BWNslUUdscgtZmZ7z2CUgETfnKv/WI97BkPZTtABy4fl/iFRyTUXmiU1mBdhnn4kU2 w1seuO99nMcqTlGkUktPGyGxpfDy1hJF2wl4NnrOKDm9diIz/rWTJRuIfNzRLHo/EY iOqFK6sBWPZBk8Nkumum2ECsuuNmIf+ppg640yLu/SKi8TWWAC/cKffuAM3oTfliIf /51QadZ74qxYRoO+u+30e20c/hMXF/BVjjMcaLegyGlBZboh0UaFLezFJnjZtBPklT Vf8NwwShZt11w== Message-ID: <2185009115e4c8efcb1c94866db4efec4fbcccbf.camel@kernel.org> Subject: Re: [PATCH 00/61] vfs: change inode->i_ino from unsigned long to u64 From: Jeff Layton To: Christian =?ISO-8859-1?Q?K=F6nig?= , Alexander Viro , Christian Brauner , Jan Kara , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Dan Williams , Matthew Wilcox , Eric Biggers , "Theodore Y. Ts'o" , Muchun Song , Oscar Salvador , David Hildenbrand , David Howells , Paulo Alcantara , Andreas Dilger , Jan Kara , Jaegeuk Kim , Chao Yu , Trond Myklebust , Anna Schumaker , Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Steve French , Ronnie Sahlberg , Shyam Prasad N , Bharath SM , Alexander Aring , Ryusuke Konishi , Viacheslav Dubeyko , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , David Sterba , Marc Dionne , Ian Kent , Luis de Bethencourt , Salah Triki , "Tigran A. Aivazian" , Ilya Dryomov , Alex Markuze , Jan Harkes , coda@cs.cmu.edu, Nicolas Pitre , Tyler Hicks , Amir Goldstein , Christoph Hellwig , John Paul Adrian Glaubitz , Yangtao Li , Mikulas Patocka , David Woodhouse , Richard Weinberger , Dave Kleikamp , Konstantin Komarov , Mark Fasheh , Joel Becker , Joseph Qi , Mike Marshall , Martin Brandenburg , Miklos Szeredi , Anders Larsen , Zhihao Cheng , Damien Le Moal , Naohiro Aota , Johannes Thumshirn , John Johansen , Paul Moore , James Morris , "Serge E. Hallyn" , Mimi Zohar , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Fan Wu , Stephen Smalley , Ondrej Mosnacek , Casey Schaufler , Alex Deucher , David Airlie , Simona Vetter , Sumit Semwal , Eric Dumazet , Kuniyuki Iwashima , Paolo Abeni , Willem de Bruijn , "David S. 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Wong" , Martin Schiller Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, nvdimm@lists.linux.dev, fsverity@lists.linux.dev, linux-mm@kvack.org, netfs@lists.linux.dev, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-nilfs@vger.kernel.org, v9fs@lists.linux.dev, linux-afs@lists.infradead.org, autofs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@coda.cs.cmu.edu, ecryptfs@vger.kernel.org, linux-mtd@lists.infradead.org, jfs-discussion@lists.sourceforge.net, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, devel@lists.orangefs.org, linux-unionfs@vger.kernel.org, apparmor@lists.ubuntu.com, linux-security-module@vger.kernel.org, linux-integrity@vger.kernel.org, selinux@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, netdev@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-fscrypt@vger.kernel.org, linux-xfs@vger.kernel.org, linux-hams@vger.kernel.org, linux-x25@vger.kernel.org Date: Fri, 27 Feb 2026 06:52:16 -0500 In-Reply-To: References: <20260226-iino-u64-v1-0-ccceff366db9@kernel.org> 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 VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ cDEsvv5IMmeMe1/qLZ6NaVkNuL3WOXvxaVT9USW1+/SGipO2IpKJjeDZfehlB/kpfF24+RrK+seQf 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Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2026-02-27 at 10:30 +0100, Christian K=C3=B6nig wrote: > On 2/26/26 16:55, Jeff Layton wrote: > > Christian said [1] to "just do it" when I proposed this, so here we are= ! > >=20 > > For historical reasons, the inode->i_ino field is an unsigned long, > > which means that it's 32 bits on 32 bit architectures. This has caused = a > > number of filesystems to implement hacks to hash a 64-bit identifier > > into a 32-bit field, and deprives us of a universal identifier field fo= r > > an inode. > >=20 > > This patchset changes the inode->i_ino field from an unsigned long to a > > u64. This shouldn't make any material difference on 64-bit hosts, but > > 32-bit hosts will see struct inode grow by at least 4 bytes. This could > > have effects on slabcache sizes and field alignment. > >=20 > > The bulk of the changes are to format strings and tracepoints, since th= e > > kernel itself doesn't care that much about the i_ino field. The first > > patch changes some vfs function arguments, so check that one out > > carefully. > >=20 > > With this change, we may be able to shrink some inode structures. For > > instance, struct nfs_inode has a fileid field that holds the 64-bit > > inode number. With this set of changes, that field could be eliminated. > > I'd rather leave that sort of cleanups for later just to keep this > > simple. > >=20 > > Much of this set was generated by LLM, but I attributed it to myself > > since I consider this to be in the "menial tasks" category of LLM usage= . >=20 > Sounds reasonable to me, should get_next_ino() also be changed to return = an 64bit ino? >=20 I'm not opposed to doing that, but I'd probably leave that for a follow-on cleanup. Just doing the i_ino conversion is already making for a huge patchset. --=20 Jeff Layton