cifs: add function to set file disposition

cifs: add function to set file disposition

The proper way to set the delete on close bit on an already existing
file is to use SET_FILE_INFO with an infolevel of
SMB_FILE_DISPOSITION_INFO. Add a function to do that and have the
silly-rename code use it.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifsproto.h

@@ -179,6 +179,8 @@ extern int CIFSSMBSetPathInfo(const int xid, struct cifsTconInfo *tcon,
 extern int CIFSSMBSetFileInfo(const int xid, struct cifsTconInfo *tcon,
 			const FILE_BASIC_INFO *data, __u16 fid,
 			__u32 pid_of_opener);
+extern int CIFSSMBSetFileDisposition(const int xid, struct cifsTconInfo *tcon,
+			bool delete_file, __u16 fid, __u32 pid_of_opener);
 #if 0
 extern int CIFSSMBSetAttrLegacy(int xid, struct cifsTconInfo *tcon,
 			char *fileName, __u16 dos_attributes,