libfs: support RENAME_NOREPLACE in simple_rename()

This is trivial to do:

 - add flags argument to simple_rename()
 - check if flags doesn't have any other than RENAME_NOREPLACE
 - assign simple_rename() to .rename2 instead of .rename

Filesystems converted:

hugetlbfs, ramfs, bpf.

Debugfs uses simple_rename() to implement debugfs_rename(), which is for
debugfs instances to rename files internally, not for userspace filesystem
access.  For this case pass zero flags to simple_rename().

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Alexei Starovoitov <ast@kernel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 5967b870a895..c92fd8936d33 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -189,7 +189,7 @@ static const struct inode_operations bpf_dir_iops = {
 	.mknod		= bpf_mkobj,
 	.mkdir		= bpf_mkdir,
 	.rmdir		= simple_rmdir,
-	.rename		= simple_rename,
+	.rename2	= simple_rename,
 	.link		= simple_link,
 	.unlink		= simple_unlink,
 };