[CIFS] Reduce CIFS tcp congestion timeout (it was too long) and backoff

ever longer amounts (up to 15 seconds).  This improves performance
especially when using large wsize.

Signed-off-by: Steve French (sfrench@us.ibm.com)

fs/cifs/cifs_debug.c

@@ -114,7 +114,7 @@ cifs_debug_data_read(char *buf, char **beginBuffer, off_t offset,
 				atomic_read(&ses->server->inFlight));
 
 #ifdef CONFIG_CIFS_STATS2
-			buf += sprintf(buf, "\tIn Send: %d In MaxReq Wait: %d",
+			buf += sprintf(buf, " In Send: %d In MaxReq Wait: %d",
 				atomic_read(&ses->server->inSend), 
 				atomic_read(&ses->server->num_waiters));
 #endif
@@ -267,7 +267,7 @@ cifs_stats_read(char *buf, char **beginBuffer, off_t offset,
 			atomic_read(&tcon->num_oplock_brks));
 		buf += item_length;
 		length += item_length;
-		item_length = sprintf(buf, "\nReads: %d Bytes %lld",
+		item_length = sprintf(buf, "\nReads:  %d Bytes %lld",
 			atomic_read(&tcon->num_reads),
 			(long long)(tcon->bytes_read));
 		buf += item_length;

fs/cifs/cifsfs.c

@@ -405,6 +405,16 @@ static struct quotactl_ops cifs_quotactl_ops = {
 };
 #endif
 
+static void cifs_umount_begin(struct super_block * sblock)
+{
+	cERROR(1,("kill all tasks now - umount begin not implemented yet"));
+
+/* BB FIXME - finish BB */
+
+	return;
+}
+
+
 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 {
 	*flags |= MS_NODIRATIME;
@@ -422,7 +432,7 @@ struct super_operations cifs_super_ops = {
    unless later we add lazy close of inodes or unless the kernel forgets to call
    us with the same number of releases (closes) as opens */
 	.show_options = cifs_show_options,
-/*    .umount_begin   = cifs_umount_begin, *//* consider adding in the future */
+/*	.umount_begin   = cifs_umount_begin, */ /* BB finish in the future */
 	.remount_fs = cifs_remount,
 };
 
@@ -790,9 +800,7 @@ static int cifs_oplock_thread(void * dummyarg)
 	do {
 		if(try_to_freeze()) 
 			continue;
-		set_current_state(TASK_INTERRUPTIBLE);
 
-		schedule_timeout(1*HZ);  
 		spin_lock(&GlobalMid_Lock);
 		if(list_empty(&GlobalOplock_Q)) {
 			spin_unlock(&GlobalMid_Lock);
@@ -841,6 +849,8 @@ static int cifs_oplock_thread(void * dummyarg)
 				}
 			} else
 				spin_unlock(&GlobalMid_Lock);
+			set_current_state(TASK_INTERRUPTIBLE);
+			schedule_timeout(1);  /* yield in case q were corrupt */
 		}
 	} while(!signal_pending(current));
 	oplockThread = NULL;

fs/cifs/transport.c

@@ -157,14 +157,14 @@ smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer,
 		/* smaller timeout here than send2 since smaller size */
 		/* Although it may not be required, this also is smaller 
 		   oplock break time */  
-			if(i > 30) {
+			if(i > 12) {
 				cERROR(1,
-				   ("sends on sock %p stuck for 15 seconds",
+				   ("sends on sock %p stuck for 7 seconds",
 				    ssocket));
 				rc = -EAGAIN;
 				break;
 			}
-			msleep(500);
+			msleep(1 << i);
 			continue;
 		}
 		if (rc < 0) 
@@ -224,14 +224,14 @@ smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec,
 				    n_vec - first_vec, total_len);
 		if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
 			i++;
-			if(i > 40) {
+			if(i >= 14) {
 				cERROR(1,
-				   ("sends on sock %p stuck for 20 seconds",
+				   ("sends on sock %p stuck for 15 seconds",
 				    ssocket));
 				rc = -EAGAIN;
 				break;
 			}
-			msleep(500);
+			msleep(1 << i);
 			continue;
 		}
 		if (rc < 0) 
@@ -249,6 +249,7 @@ smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec,
 			continue;
 		}
 		total_len -= rc;
+		/* the line below resets i */
 		for (i = first_vec; i < n_vec; i++) {
 			if (iov[i].iov_len) {
 				if (rc > iov[i].iov_len) {