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Mon, 9 Mar 2026 17:47:09 +0000 (GMT) Message-ID: <05b5d55c49b5a1bbc43a5315e3c84872e7e634b3.camel@linux.ibm.com> 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: <20260304-iino-u64-v3-0-2257ad83d372@kernel.org> References: <20260304-iino-u64-v3-0-2257ad83d372@kernel.org> Content-Type: text/plain; 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Trimming the To list.] 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 patch > 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 been > 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 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 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 could > 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 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 > [1]: https://lore.kernel.org/linux-fsdevel/20260219-portrait-winkt-959070= cee42f@brauner/ >=20 > Signed-off-by: Jeff Layton Jeff, missing from this patch set is EVM. In hmac_add_misc() EVM copies th= e i_ino and calculates either an HMAC or file meta-data hash, which is then signed.=20 Mimi