cifs: support RENAME_NOREPLACE
This flag gives CIFS the ability to support its native rename semantics.
Implementation is simple: just bail out before trying to hack around the
noreplace semantics.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Steve French <smfrench@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index a174605..bec0a08 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1627,8 +1627,9 @@
}
int
-cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
- struct inode *target_dir, struct dentry *target_dentry)
+cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
+ struct inode *target_dir, struct dentry *target_dentry,
+ unsigned int flags)
{
char *from_name = NULL;
char *to_name = NULL;
@@ -1640,6 +1641,9 @@
unsigned int xid;
int rc, tmprc;
+ if (flags & ~RENAME_NOREPLACE)
+ return -EINVAL;
+
cifs_sb = CIFS_SB(source_dir->i_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
@@ -1667,6 +1671,12 @@
rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
to_name);
+ /*
+ * No-replace is the natural behavior for CIFS, so skip unlink hacks.
+ */
+ if (flags & RENAME_NOREPLACE)
+ goto cifs_rename_exit;
+
if (rc == -EEXIST && tcon->unix_ext) {
/*
* Are src and dst hardlinks of same inode? We can only tell
