From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E6DF7FCA177 for ; Mon, 9 Mar 2026 19:00:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BE5B96B0005; Mon, 9 Mar 2026 15:00:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B9C5F6B0089; Mon, 9 Mar 2026 15:00:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AC8BB6B008A; Mon, 9 Mar 2026 15:00:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 9A21C6B0005 for ; Mon, 9 Mar 2026 15:00:18 -0400 (EDT) Received: from smtpin16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 486EC1A0310 for ; Mon, 9 Mar 2026 19:00:18 +0000 (UTC) X-FDA: 84527440116.16.74CD6CF Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by imf01.hostedemail.com (Postfix) with ESMTP id 93C1E4000A for ; Mon, 9 Mar 2026 19:00:15 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=d2IgH4d2; dmarc=pass (policy=none) header.from=ibm.com; spf=pass (imf01.hostedemail.com: domain of zohar@linux.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=zohar@linux.ibm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1773082815; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=5swsN0rUxxavDq9zMYnPJS2Jv47BUk07HnZRz0pbh40=; b=wRoaU7CgAPJOvWk8PnpKuwbcHl7j5mAIkOdtdx+nZKThx2O1GdFr5NYVShsbVYTTq/Jih7 6ZZY4YXmAUCYJF3rX0cJMIjuJsmSXxe56KAlRfJUGa9L4iY4shYBEfa5T+X72OP0GURShM UehxeFO+/fAyAc2cqLmE2kyDeDuu/qw= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1773082815; a=rsa-sha256; cv=none; b=66x2Gh57NtXep51IRV9E/Lye6BxBhPVYdUS3Rrr6+jGD2eBsyS51SUHbUQ9C4Fk9UeSINf jmJhk5bKzbYLxwNxvk1xw/TyfZjS24mnp2Ew/wofmrBg8wQy2MidLDYcMZOpm3ckX0MJUe lnwR3kVs8QfVcVr2/GC3gAmhK4gDOHc= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=d2IgH4d2; dmarc=pass (policy=none) header.from=ibm.com; spf=pass (imf01.hostedemail.com: domain of zohar@linux.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=zohar@linux.ibm.com Received: from pps.filterd (m0356516.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 629BiYp9402979; Mon, 9 Mar 2026 19:00:10 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=pp1; bh=5swsN0 rUxxavDq9zMYnPJS2Jv47BUk07HnZRz0pbh40=; b=d2IgH4d2cI76xjXosS08+5 z7p4cmRM3+vsUQToHiG2nB8DP/joMF596z7727f61cqMRXeNJJpaPHxOajT8sUoA 4hdB+fd4u1HsuNVMFr3OsadtAG1CKvM35tVtsMpgaqqCM2ZBMMXJkpG++BlAdorh a25OzV7jJWb6oFmtakhiLNn+qzaAmqYeRhvuloIidiB6X0BgKDL71O4yfuzN3RUh AoqpvZ653XjMWMMwrSPrZbVK8uRNsl6RplSUCc6nWvYsnXyDf2A2VF2Up7qZowSZ aJlNA2A77/MP8caSRZkmC6D9PsUx9bOXT5BvUfyuxzfxj3qWmymQF0ir3jH77L1w == Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4crcun7rdb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 09 Mar 2026 19:00:09 +0000 (GMT) Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 629FvaW1015771; Mon, 9 Mar 2026 19:00:08 GMT Received: from smtprelay05.wdc07v.mail.ibm.com ([172.16.1.72]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 4cs121ww0t-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 09 Mar 2026 19:00:08 +0000 Received: from smtpav03.dal12v.mail.ibm.com (smtpav03.dal12v.mail.ibm.com [10.241.53.102]) by smtprelay05.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 629J079s4915810 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 9 Mar 2026 19:00:08 GMT Received: from smtpav03.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B444C58064; Mon, 9 Mar 2026 19:00:07 +0000 (GMT) Received: from smtpav03.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E09F35805A; Mon, 9 Mar 2026 19:00:04 +0000 (GMT) Received: from li-43857255-d5e6-4659-90f1-fc5cee4750ad.ibm.com (unknown [9.61.72.80]) by smtpav03.dal12v.mail.ibm.com (Postfix) with ESMTP; Mon, 9 Mar 2026 19:00:04 +0000 (GMT) Message-ID: Subject: Re: [PATCH v3 00/12] vfs: change inode->i_ino from unsigned long to u64 From: Mimi Zohar To: Jeff Layton 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, audit@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-can@vger.kernel.org, linux-sctp@vger.kernel.org, bpf@vger.kernel.org In-Reply-To: References: <20260304-iino-u64-v3-0-2257ad83d372@kernel.org> <05b5d55c49b5a1bbc43a5315e3c84872e7e634b3.camel@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Date: Mon, 09 Mar 2026 15:00:04 -0400 MIME-Version: 1.0 User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: IXXixi4WEaMt5ZLipHNyYmLY2v6HWLsd X-Authority-Analysis: v=2.4 cv=Hp172kTS c=1 sm=1 tr=0 ts=69af18ba cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VwQbUJbxAAAA:8 a=o9bg_TheAfZNAX0b3qsA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzA5MDE2NSBTYWx0ZWRfX6z/xa1oiKPHE y5EqU++9e+D9gbPsThEA40KAIQaMNONuQFv6rphXC4UXK9hbuizpabscJIBcCstT+gR2HtuKysP juuUkxGaMl7wxMTZHQleqdpaj1BApzfJEmhJlxbY5TY+zaAhKCE7FmRzIMEIOEQTi0cM+UreNNn frwDdmfnFwh4sJREHHlQDdGWVECyjZbYar7Sfrv1WmeMPxeeCh8/LcWzrRHQxRnw2tvA2a4D8NR c7ma8KolSpfVjNgJ0OleioMQBwEZGtoJr7jBKqVpvCDiflI9IHYr2EnI/OMDVmsDQcjOAtzHE2E Cqs2ZZL0dk00OuX7g/sw5bXFEAXaWjWvfls2vJrY4HNOaz6u97184uDaehJuW5B2dmjBv87lTJU mdY20MyhE/Ql/CExB+A/Xcl6KkN3u1kmsdTu44KKD0LP1RVDdsR5dGWPIvWKEchoHvJnuy6WqMG FGu2ZyF+vBxNE+HNtfg== X-Proofpoint-ORIG-GUID: IXXixi4WEaMt5ZLipHNyYmLY2v6HWLsd X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-09_05,2026-03-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 malwarescore=0 impostorscore=0 suspectscore=0 spamscore=0 phishscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603090165 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 93C1E4000A X-Stat-Signature: 5ni9w4ndpop7fr73o3p9b6thrw8sdinn X-Rspam-User: X-HE-Tag: 1773082815-614366 X-HE-Meta: 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 iBem6qUG i4JSlTIlYAf9eqeBOi3iZ0Q0nZhJusDL8O+83147cBye0KJfmWFDSdOJo2XywCNfZ27KX3WIXatkkZcTlwPRhdWXvbpIpmJ5Yw5g85Nb0CY1KU/R8icS0DwsHvc4Ig9ieqRzmpiKAui65vUoicVoz0YMM+krDswjYKslb7aA8Zuw4PWUcERlJj89FsPV5NwKBuV1WLN5cBRcNaVhfSZJm5aIZO0iOoySgSbX1pbGNHfEA0zJp3kJrN+Zatq+HgTn425CE3JJIw2f20lQ0Gqr35ZgxOAqDNNHKBP7fIl16xLU2wnr9T/7875fXqsHNwzjiSNODBX3qRTEEFWDuOr9XANRsMgA1jB3SZSCH Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 2026-03-09 at 13:59 -0400, Jeff Layton wrote: > On Mon, 2026-03-09 at 13:47 -0400, Mimi Zohar wrote: > > [ I/O socket time out. Trimming the To list.] > >=20 > > On Wed, 2026-03-04 at 10:32 -0500, Jeff Layton wrote: > > > This version squashes all of the format-string changes and the i_ino > > > type change into the same patch. This results in a giant 600+ line pa= tch > > > at the end of the series, but it does remain bisectable. Because the > > > patchset was reorganized (again) some of the R-b's and A-b's have bee= n > > > dropped. > > >=20 > > > The entire pile is in the "iino-u64" branch of my tree, if anyone is > > > interested in testing this. > > >=20 > > > https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git= / > > >=20 > > > Original cover letter follows: > > >=20 > > > ----------------------8<----------------------- > > >=20 > > > Christian said [1] to "just do it" when I proposed this, so here we a= re! > > >=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 cause= d 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 = for > > > 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 cou= ld > > > have effects on slabcache sizes and field alignment. > > >=20 > > > The bulk of the changes are to format strings and tracepoints, since = the > > > 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 eliminate= d. > > > 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 usa= ge. > > >=20 > > > [1]: https://lore.kernel.org/linux-fsdevel/20260219-portrait-winkt-95= 9070cee42f@brauner/ > > >=20 > > > Signed-off-by: Jeff Layton > >=20 > > Jeff, missing from this patch set is EVM. In hmac_add_misc() EVM copie= s the > > i_ino and calculates either an HMAC or file meta-data hash, which is th= en > > signed.=20 > >=20 > >=20 >=20 > Thanks Mimi, good catch. >=20 > It looks like we should just be able to change the ino field to a u64 > alongside everything else. Something like this: >=20 > diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm= /evm_crypto.c > index c0ca4eedb0fe..77b6c2fa345e 100644 > --- a/security/integrity/evm/evm_crypto.c > +++ b/security/integrity/evm/evm_crypto.c > @@ -144,7 +144,7 @@ static void hmac_add_misc(struct shash_desc *desc, st= ruct inode *inode, > char type, char *digest) > { > struct h_misc { > - unsigned long ino; > + u64 ino; > __u32 generation; > uid_t uid; > gid_t gid; >=20 Agreed. >=20 > That should make no material difference on 64-bit hosts. What's the > effect on 32-bit? Will they just need to remeasure everything or would > the consequences be more dire? Do we have any clue whether anyone is > using EVM in 32-bit environments? All good questions. Unfortunately I don't know the answer to most of them. = What we do know: changing the size of the i_ino field would affect EVM file meta= data verification and would require relabeling the filesystem. Even packages containing EVM portable signatures, which don't include or verify the i_ino number, would be affected. Mimi