Now that i_ino is u64, the VFS stat path handles 64-bit inode numbers
natively. The truncation to 32-bit st_ino (with -EOVERFLOW) is handled
by cp_new_stat() and cp_compat_stat() in the generic stat code, so the
NFS-specific XOR-folding hack is no longer needed.

Remove nfs_compat_user_ino64() and have callers pass the full 64-bit
fileid directly to stat->ino and dir_emit(), both of which accept u64.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/nfs/dir.c           |  2 +-
 fs/nfs/inode.c         | 25 +------------------------
 include/linux/nfs_fs.h |  1 -
 3 files changed, 2 insertions(+), 26 deletions(-)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index ddc3789363a5f8a2ef0169e37aa2292d075092c4..a9ef74d0cff8de58a42be9c2c94af428a347bb2e 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1107,7 +1107,7 @@ static void nfs_do_filldir(struct nfs_readdir_descriptor *desc,
 
 		ent = &array->array[i];
 		if (!dir_emit(desc->ctx, ent->name, ent->name_len,
-		    nfs_compat_user_ino64(ent->ino), ent->d_type)) {
+		    ent->ino, ent->d_type)) {
 			desc->eob = true;
 			break;
 		}
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index d88f5689548bcb4e27d6087a49b525762fbaa9e2..1a7d7bafbb623ab603b8c517628343463277e096 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -77,29 +77,6 @@ int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
 }
 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
 
-/**
- * nfs_compat_user_ino64 - returns the user-visible inode number
- * @fileid: 64-bit fileid
- *
- * This function returns a 32-bit inode number if the boot parameter
- * nfs.enable_ino64 is zero.
- */
-u64 nfs_compat_user_ino64(u64 fileid)
-{
-#ifdef CONFIG_COMPAT
-	compat_ulong_t ino;
-#else	
-	unsigned long ino;
-#endif
-
-	if (enable_ino64)
-		return fileid;
-	ino = fileid;
-	if (sizeof(ino) < sizeof(fileid))
-		ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
-	return ino;
-}
-
 int nfs_drop_inode(struct inode *inode)
 {
 	return NFS_STALE(inode) || inode_generic_drop(inode);
@@ -1061,7 +1038,7 @@ int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
 	stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
 
 	generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
-	stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
+	stat->ino = NFS_FILEID(inode);
 	stat->change_cookie = inode_peek_iversion_raw(inode);
 	stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
 	if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED)
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 816670562d17b3f46ec2d22d4f9412e42f7e1a3b..d721a8acbb449666941ec19b18386b42c152db10 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -472,7 +472,6 @@ extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context
 extern void nfs_file_clear_open_context(struct file *flip);
 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
-extern u64 nfs_compat_user_ino64(u64 fileid);
 extern void nfs_fattr_init(struct nfs_fattr *fattr);
 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
 extern unsigned long nfs_inc_attr_generation_counter(void);

-- 
2.53.0