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This is the actual type widening of i_ino. All format strings have already been converted to use PRIino, so this change compiles warning-free on both 32-bit and 64-bit architectures. On 64-bit architectures, unsigned long is already 64 bits, so this is effectively a type alias change with no runtime impact. On 32-bit architectures, this widens i_ino from 32 to 64 bits, allowing filesystems like NFS, CIFS, XFS, Ceph, and FUSE to store their native 64-bit inode numbers without folding/hashing. The VFS already handles 64-bit inode numbers in kstat.ino (u64) and statx.stx_ino (__u64). The existing overflow checks in cp_new_stat(), cp_old_stat(), and cp_compat_stat() handle narrowing to 32-bit st_ino with -EOVERFLOW, so userspace ABI is preserved. struct inode will grow by 4 bytes on 32-bit architectures. Signed-off-by: Jeff Layton --- include/linux/fs.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/fs.h b/include/linux/fs.h index d0c4789838b5852111583a3e4cced88999496e68..4193817e02e8bf94f29514ca43379af21f37ac61 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -758,8 +758,8 @@ struct inode_state_flags { enum inode_state_flags_enum __state; }; -typedef unsigned long kino_t; -#define PRIino "l" +typedef u64 kino_t; +#define PRIino "ll" /* * Keep mostly read-only and often accessed (especially for -- 2.53.0