cifs: Fix the target file was deleted when rename failed.

When xfstest generic/035, we found the target file was deleted
if the rename return -EACESS.

In cifs_rename2, we unlink the positive target dentry if rename
failed with EACESS or EEXIST, even if the target dentry is positived
before rename. Then the existing file was deleted.

We should just delete the target file which created during the
rename.

Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Zhang Xiaoxu <[email protected]>
Cc: [email protected]
Signed-off-by: Steve French <[email protected]>
Reviewed-by: Aurelien Aptel <[email protected]>

Author: z00467499

fs/cifs/inode.c

@@ -2044,6 +2044,7 @@ cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
 	FILE_UNIX_BASIC_INFO *info_buf_target;
 	unsigned int xid;
 	int rc, tmprc;
+	bool new_target = d_really_is_negative(target_dentry);
 
 	if (flags & ~RENAME_NOREPLACE)
 		return -EINVAL;
@@ -2120,8 +2121,13 @@ cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
 	 */
 
 unlink_target:
-	/* Try unlinking the target dentry if it's not negative */
-	if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
+	/*
+	 * If the target dentry was created during the rename, try
+	 * unlinking it if it's not negative
+	 */
+	if (new_target &&
+	    d_really_is_positive(target_dentry) &&
+	    (rc == -EACCES || rc == -EEXIST)) {
 		if (d_is_dir(target_dentry))
 			tmprc = cifs_rmdir(target_dir, target_dentry);
 		else