cifs: convert send_nt_cancel into a version specific op
For SMB2, this should be a no-op. Obviously if we wanted to do something
for the SMB2 case, we could also define an operation here for it.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index d2850d1..fa486f0 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -18,8 +18,49 @@
*/
#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+
+/*
+ * An NT cancel request header looks just like the original request except:
+ *
+ * The Command is SMB_COM_NT_CANCEL
+ * The WordCount is zeroed out
+ * The ByteCount is zeroed out
+ *
+ * This function mangles an existing request buffer into a
+ * SMB_COM_NT_CANCEL request and then sends it.
+ */
+static int
+send_nt_cancel(struct TCP_Server_Info *server, void *buf,
+ struct mid_q_entry *mid)
+{
+ int rc = 0;
+ struct smb_hdr *in_buf = (struct smb_hdr *)buf;
+
+ /* -4 for RFC1001 length and +2 for BCC field */
+ in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
+ in_buf->Command = SMB_COM_NT_CANCEL;
+ in_buf->WordCount = 0;
+ put_bcc(0, in_buf);
+
+ mutex_lock(&server->srv_mutex);
+ rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
+ if (rc) {
+ mutex_unlock(&server->srv_mutex);
+ return rc;
+ }
+ rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
+ mutex_unlock(&server->srv_mutex);
+
+ cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
+ in_buf->Mid, rc);
+
+ return rc;
+}
struct smb_version_operations smb1_operations = {
+ .send_cancel = send_nt_cancel,
};
struct smb_version_values smb1_values = {