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@b...
Signed-off-by: Jeff Layton jlayton@kernel.org --- 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,