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>
diff --git a/fs/libfs.c b/fs/libfs.c
index 74dc8b9..4758353 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -349,11 +349,15 @@
EXPORT_SYMBOL(simple_rmdir);
int simple_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
+ struct inode *new_dir, struct dentry *new_dentry,
+ unsigned int flags)
{
struct inode *inode = d_inode(old_dentry);
int they_are_dirs = d_is_dir(old_dentry);
+ if (flags & ~RENAME_NOREPLACE)
+ return -EINVAL;
+
if (!simple_empty(new_dentry))
return -ENOTEMPTY;