[PATCH 00/61] vfs: change inode->i_ino from unsigned long to u64

From: Jeff Layton

Date: Thu Feb 26 2026 - 10:58:43 EST

Christian said [1] to "just do it" when I proposed this, so here we are!

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.

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.

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.

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.

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.

[1]: https://lore.kernel.org/linux-fsdevel/20260219-portrait-winkt-959070cee42f@brauner/

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
Jeff Layton (61):
vfs: widen inode hash/lookup functions to u64
vfs: change i_ino from unsigned long to u64
trace: update VFS-layer trace events for u64 i_ino
ext4: update for u64 i_ino
jbd2: update format strings for u64 i_ino
f2fs: update for u64 i_ino
lockd: update format strings for u64 i_ino
nfs: update for u64 i_ino
nfs: remove nfs_fattr_to_ino_t() and nfs_fileid_to_ino_t()
nfs: remove nfs_compat_user_ino64()
nfs: remove enable_ino64 module parameter
nfsd: update format strings for u64 i_ino
smb: store full 64-bit uniqueid in i_ino
smb: remove cifs_uniqueid_to_ino_t()
locks: update /proc/locks format for u64 i_ino
proc: update /proc/PID/maps for u64 i_ino
nilfs2: update for u64 i_ino
9p: update format strings for u64 i_ino
affs: update format strings for u64 i_ino
afs: update format strings for u64 i_ino
autofs: update format strings for u64 i_ino
befs: update format strings for u64 i_ino
bfs: update format strings for u64 i_ino
cachefiles: update format strings for u64 i_ino
ceph: update format strings for u64 i_ino
coda: update format strings for u64 i_ino
cramfs: update format strings for u64 i_ino
ecryptfs: update format strings for u64 i_ino
efs: update format strings for u64 i_ino
exportfs: update format strings for u64 i_ino
ext2: update format strings for u64 i_ino
freevxfs: update format strings for u64 i_ino
hfs: update format strings for u64 i_ino
hfsplus: update format strings for u64 i_ino
hpfs: update format strings for u64 i_ino
isofs: update format strings for u64 i_ino
jffs2: update format strings for u64 i_ino
jfs: update format strings for u64 i_ino
minix: update format strings for u64 i_ino
nsfs: update format strings for u64 i_ino
ntfs3: update format strings for u64 i_ino
ocfs2: update format strings for u64 i_ino
orangefs: update format strings for u64 i_ino
overlayfs: update format strings for u64 i_ino
qnx4: update format strings for u64 i_ino
qnx6: update format strings for u64 i_ino
ubifs: update format strings for u64 i_ino
udf: update format strings for u64 i_ino
ufs: update format strings for u64 i_ino
zonefs: update format strings for u64 i_ino
security: update audit format strings for u64 i_ino
drm/amdgpu: update for u64 i_ino
fsnotify: update fdinfo format strings for u64 i_ino
net: update socket dname format for u64 i_ino
uprobes: update format strings for u64 i_ino
dma-buf: update format string for u64 i_ino
fscrypt: update format strings for u64 i_ino
fsverity: update format string for u64 i_ino
iomap: update format string for u64 i_ino
net: update legacy protocol format strings for u64 i_ino
vfs: update core format strings for u64 i_ino

drivers/dma-buf/dma-buf.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 +-
fs/9p/vfs_addr.c | 4 +-
fs/9p/vfs_inode.c | 6 +-
fs/9p/vfs_inode_dotl.c | 6 +-
fs/affs/amigaffs.c | 8 +-
fs/affs/bitmap.c | 2 +-
fs/affs/dir.c | 2 +-
fs/affs/file.c | 20 +-
fs/affs/inode.c | 12 +-
fs/affs/namei.c | 14 +-
fs/affs/symlink.c | 2 +-
fs/afs/dir.c | 10 +-
fs/afs/dir_search.c | 2 +-
fs/afs/dynroot.c | 2 +-
fs/afs/inode.c | 2 +-
fs/autofs/inode.c | 2 +-
fs/befs/linuxvfs.c | 28 +-
fs/bfs/dir.c | 4 +-
fs/cachefiles/io.c | 6 +-
fs/cachefiles/namei.c | 12 +-
fs/cachefiles/xattr.c | 2 +-
fs/ceph/crypto.c | 4 +-
fs/coda/dir.c | 2 +-
fs/coda/inode.c | 2 +-
fs/cramfs/inode.c | 2 +-
fs/crypto/crypto.c | 2 +-
fs/crypto/hooks.c | 2 +-
fs/crypto/keysetup.c | 2 +-
fs/dcache.c | 4 +-
fs/ecryptfs/crypto.c | 6 +-
fs/ecryptfs/file.c | 2 +-
fs/efs/inode.c | 6 +-
fs/eventpoll.c | 2 +-
fs/exportfs/expfs.c | 4 +-
fs/ext2/dir.c | 10 +-
fs/ext2/ialloc.c | 9 +-
fs/ext2/inode.c | 2 +-
fs/ext2/xattr.c | 14 +-
fs/ext4/dir.c | 2 +-
fs/ext4/ext4.h | 4 +-
fs/ext4/extents.c | 8 +-
fs/ext4/extents_status.c | 28 +-
fs/ext4/fast_commit.c | 8 +-
fs/ext4/ialloc.c | 10 +-
fs/ext4/indirect.c | 2 +-
fs/ext4/inline.c | 14 +-
fs/ext4/inode.c | 22 +-
fs/ext4/ioctl.c | 4 +-
fs/ext4/mballoc.c | 6 +-
fs/ext4/migrate.c | 2 +-
fs/ext4/move_extent.c | 20 +-
fs/ext4/namei.c | 10 +-
fs/ext4/orphan.c | 16 +-
fs/ext4/page-io.c | 10 +-
fs/ext4/super.c | 22 +-
fs/ext4/xattr.c | 10 +-
fs/f2fs/compress.c | 4 +-
fs/f2fs/dir.c | 2 +-
fs/f2fs/extent_cache.c | 8 +-
fs/f2fs/f2fs.h | 6 +-
fs/f2fs/file.c | 12 +-
fs/f2fs/gc.c | 2 +-
fs/f2fs/inline.c | 4 +-
fs/f2fs/inode.c | 48 ++--
fs/f2fs/namei.c | 8 +-
fs/f2fs/node.c | 12 +-
fs/f2fs/recovery.c | 10 +-
fs/f2fs/xattr.c | 10 +-
fs/freevxfs/vxfs_bmap.c | 4 +-
fs/fserror.c | 2 +-
fs/hfs/catalog.c | 2 +-
fs/hfs/extent.c | 4 +-
fs/hfs/inode.c | 4 +-
fs/hfsplus/attributes.c | 10 +-
fs/hfsplus/catalog.c | 2 +-
fs/hfsplus/dir.c | 6 +-
fs/hfsplus/extents.c | 6 +-
fs/hfsplus/inode.c | 8 +-
fs/hfsplus/super.c | 6 +-
fs/hfsplus/xattr.c | 10 +-
fs/hpfs/dir.c | 4 +-
fs/hpfs/dnode.c | 4 +-
fs/hpfs/ea.c | 4 +-
fs/hpfs/inode.c | 4 +-
fs/inode.c | 46 ++--
fs/iomap/ioend.c | 2 +-
fs/isofs/compress.c | 2 +-
fs/isofs/dir.c | 2 +-
fs/isofs/inode.c | 6 +-
fs/isofs/namei.c | 2 +-
fs/jbd2/journal.c | 4 +-
fs/jbd2/transaction.c | 2 +-
fs/jffs2/dir.c | 4 +-
fs/jffs2/file.c | 4 +-
fs/jffs2/fs.c | 18 +-
fs/jfs/inode.c | 2 +-
fs/jfs/jfs_imap.c | 2 +-
fs/jfs/jfs_metapage.c | 2 +-
fs/lockd/svclock.c | 8 +-
fs/lockd/svcsubs.c | 2 +-
fs/locks.c | 6 +-
fs/minix/inode.c | 10 +-
fs/nfs/dir.c | 22 +-
fs/nfs/file.c | 8 +-
fs/nfs/filelayout/filelayout.c | 8 +-
fs/nfs/flexfilelayout/flexfilelayout.c | 8 +-
fs/nfs/inode.c | 54 +---
fs/nfs/nfs4proc.c | 4 +-
fs/nfs/pnfs.c | 12 +-
fs/nfsd/export.c | 2 +-
fs/nfsd/nfs4state.c | 4 +-
fs/nfsd/nfsfh.c | 4 +-
fs/nfsd/vfs.c | 2 +-
fs/nilfs2/alloc.c | 10 +-
fs/nilfs2/bmap.c | 2 +-
fs/nilfs2/btnode.c | 2 +-
fs/nilfs2/btree.c | 12 +-
fs/nilfs2/dir.c | 12 +-
fs/nilfs2/direct.c | 4 +-
fs/nilfs2/gcinode.c | 2 +-
fs/nilfs2/inode.c | 8 +-
fs/nilfs2/mdt.c | 2 +-
fs/nilfs2/namei.c | 2 +-
fs/nilfs2/segment.c | 2 +-
fs/notify/fdinfo.c | 4 +-
fs/nsfs.c | 4 +-
fs/ntfs3/super.c | 2 +-
fs/ocfs2/alloc.c | 2 +-
fs/ocfs2/aops.c | 4 +-
fs/ocfs2/dir.c | 8 +-
fs/ocfs2/dlmfs/dlmfs.c | 10 +-
fs/ocfs2/extent_map.c | 12 +-
fs/ocfs2/inode.c | 2 +-
fs/ocfs2/quota_local.c | 2 +-
fs/ocfs2/refcounttree.c | 10 +-
fs/ocfs2/xattr.c | 4 +-
fs/orangefs/inode.c | 2 +-
fs/overlayfs/export.c | 2 +-
fs/overlayfs/namei.c | 4 +-
fs/overlayfs/util.c | 2 +-
fs/pipe.c | 2 +-
fs/proc/fd.c | 2 +-
fs/proc/task_mmu.c | 4 +-
fs/qnx4/inode.c | 4 +-
fs/qnx6/inode.c | 2 +-
fs/smb/client/cifsfs.h | 17 --
fs/smb/client/inode.c | 6 +-
fs/smb/client/readdir.c | 2 +-
fs/ubifs/debug.c | 8 +-
fs/ubifs/dir.c | 28 +-
fs/ubifs/file.c | 28 +-
fs/ubifs/journal.c | 6 +-
fs/ubifs/super.c | 16 +-
fs/ubifs/tnc.c | 4 +-
fs/ubifs/xattr.c | 14 +-
fs/udf/directory.c | 18 +-
fs/udf/file.c | 2 +-
fs/udf/inode.c | 12 +-
fs/udf/namei.c | 8 +-
fs/udf/super.c | 2 +-
fs/ufs/balloc.c | 6 +-
fs/ufs/dir.c | 10 +-
fs/ufs/ialloc.c | 6 +-
fs/ufs/inode.c | 18 +-
fs/ufs/ufs_fs.h | 6 +-
fs/ufs/util.c | 2 +-
fs/verity/init.c | 2 +-
fs/zonefs/super.c | 8 +-
include/linux/fs.h | 28 +-
include/linux/nfs_fs.h | 10 -
include/trace/events/cachefiles.h | 18 +-
include/trace/events/ext4.h | 427 +++++++++++++++--------------
include/trace/events/f2fs.h | 172 ++++++------
include/trace/events/filelock.h | 16 +-
include/trace/events/filemap.h | 20 +-
include/trace/events/fs_dax.h | 20 +-
include/trace/events/fsverity.h | 30 +-
include/trace/events/hugetlbfs.h | 28 +-
include/trace/events/netfs.h | 4 +-
include/trace/events/nilfs2.h | 12 +-
include/trace/events/readahead.h | 12 +-
include/trace/events/timestamp.h | 12 +-
include/trace/events/writeback.h | 148 +++++-----
kernel/events/uprobes.c | 4 +-
net/netrom/af_netrom.c | 4 +-
net/rose/af_rose.c | 4 +-
net/socket.c | 2 +-
net/x25/x25_proc.c | 4 +-
security/apparmor/apparmorfs.c | 4 +-
security/integrity/integrity_audit.c | 2 +-
security/ipe/audit.c | 2 +-
security/lsm_audit.c | 10 +-
security/selinux/hooks.c | 4 +-
security/smack/smack_lsm.c | 12 +-
195 files changed, 1101 insertions(+), 1166 deletions(-)
---
base-commit: 2bf35e96cf6c6c3a290b69b777d34be15888e364
change-id: 20260224-iino-u64-b44a3a72543c

Best regards,
--
Jeff Layton <jlayton@xxxxxxxxxx>