cifs: send an NT_CANCEL request when a process is signalled

Use the new send_nt_cancel function to send an NT_CANCEL when the
process is delivered a fatal signal. This is a "best effort" enterprise
however, so don't bother to check the return code. There's nothing we
can reasonably do if it fails anyway.

Reviewed-by: Pavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 9b2d037..bdaa4aa 100644 (file)
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -570,20 +570,25 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
 #endif
 
        mutex_unlock(&ses->server->srv_mutex);
-       cifs_small_buf_release(in_buf);
 
-       if (rc < 0)
+       if (rc < 0) {
+               cifs_small_buf_release(in_buf);
                goto out;
+       }
 
-       if (long_op == CIFS_ASYNC_OP)
+       if (long_op == CIFS_ASYNC_OP) {
+               cifs_small_buf_release(in_buf);
                goto out;
+       }
 
        rc = wait_for_response(ses->server, midQ);
        if (rc != 0) {
+               send_nt_cancel(ses->server, in_buf, midQ);
                spin_lock(&GlobalMid_Lock);
                if (midQ->midState == MID_REQUEST_SUBMITTED) {
                        midQ->callback = DeleteMidQEntry;
                        spin_unlock(&GlobalMid_Lock);
+                       cifs_small_buf_release(in_buf);
                        atomic_dec(&ses->server->inFlight);
                        wake_up(&ses->server->request_q);
                        return rc;
@@ -591,6 +596,8 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
                spin_unlock(&GlobalMid_Lock);
        }
 
+       cifs_small_buf_release(in_buf);
+
        rc = sync_mid_result(midQ, ses->server);
        if (rc != 0) {
                atomic_dec(&ses->server->inFlight);
@@ -734,6 +741,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
 
        rc = wait_for_response(ses->server, midQ);
        if (rc != 0) {
+               send_nt_cancel(ses->server, in_buf, midQ);
                spin_lock(&GlobalMid_Lock);
                if (midQ->midState == MID_REQUEST_SUBMITTED) {
                        /* no longer considered to be "in-flight" */
@@ -943,6 +951,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
 
                rc = wait_for_response(ses->server, midQ);
                if (rc) {
+                       send_nt_cancel(ses->server, in_buf, midQ);
                        spin_lock(&GlobalMid_Lock);
                        if (midQ->midState == MID_REQUEST_SUBMITTED) {
                                /* no longer considered to be "in-flight" */