Change the type of i_ino in struct inode from unsigned long to u64. 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 <[email protected]> --- include/linux/fs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/fs.h b/include/linux/fs.h index dfa1f475b1c480c503ab6f00e891aa9b051607fa..097443bf12e289c347651e5f3da5b67eb6b53121 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -783,7 +783,7 @@ struct inode { #endif /* Stat data, not accessed from path walking */ - unsigned long i_ino; + u64 i_ino; /* * Filesystems may only read i_nlink directly. They shall use the * following functions for modification: -- 2.53.0
