[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)

3 files changed, 22 insertions, 11 deletions

diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index 785239618d89..b7fb064f6548 100644
--- a/fs/cifs/cifs_debug.c
+++ b/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;
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 1f97d39100ee..e3177a031edc 100644
--- a/fs/cifs/cifsfs.c
+++ b/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;
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 893a6fef9853..d9b11690746d 100644
--- a/fs/cifs/transport.c
+++ b/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) {