[CIFS] CIFS Stats improvements

New cifs_writepages routine was not updated bytes written in cifs stats.
Also added ability to clear /proc/fs/cifs/Stats by writing (0 or 1) to it.
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index d8865fbd876a..981ea0d8b9cd 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -59,7 +59,9 @@ AllocMidQEntry(struct smb_hdr *smb_buffer, struct cifsSesInfo *ses)
                 temp->pid = current->pid;
                 temp->command = smb_buffer->Command;
                 cFYI(1, ("For smb_command %d", temp->command));
-                do_gettimeofday(&temp->when_sent);
+        /*      do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
+                /* when mid allocated can be before when sent */
+                temp->when_alloc = jiffies;
                 temp->ses = ses;
                 temp->tsk = current;
         }
@@ -75,6 +77,9 @@ AllocMidQEntry(struct smb_hdr *smb_buffer, struct cifsSesInfo *ses)
 static void
 DeleteMidQEntry(struct mid_q_entry *midEntry)
 {
+#ifdef CONFIG_CIFS_STATS2
+        unsigned long now;
+#endif
         spin_lock(&GlobalMid_Lock);
         midEntry->midState = MID_FREE;
         list_del(&midEntry->qhead);
@@ -84,6 +89,22 @@ DeleteMidQEntry(struct mid_q_entry *midEntry)
                 cifs_buf_release(midEntry->resp_buf);
         else
                 cifs_small_buf_release(midEntry->resp_buf);
+#ifdef CONFIG_CIFS_STATS2
+        now = jiffies;
+        /* commands taking longer than one second are indications that
+           something is wrong, unless it is quite a slow link or server */
+        if((now - midEntry->when_alloc) > HZ) {
+                if((cifsFYI & CIFS_TIMER) && 
+                   (midEntry->command != SMB_COM_LOCKING_ANDX)) {
+                        printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d",
+                               midEntry->command, midEntry->mid);
+                        printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n",
+                               now - midEntry->when_alloc,
+                               now - midEntry->when_sent,
+                               now - midEntry->when_received);
+                }
+        }
+#endif
         mempool_free(midEntry, cifs_mid_poolp);
 }
 
@@ -382,6 +403,7 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
                       (struct sockaddr *) &(ses->server->addr.sockAddr));
 #ifdef CONFIG_CIFS_STATS2
         atomic_dec(&ses->server->inSend);
+        midQ->when_sent = jiffies;
 #endif
         if(rc < 0) {
                 DeleteMidQEntry(midQ);
@@ -646,6 +668,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
                       (struct sockaddr *) &(ses->server->addr.sockAddr));
 #ifdef CONFIG_CIFS_STATS2
         atomic_dec(&ses->server->inSend);
+        midQ->when_sent = jiffies;
 #endif
         if(rc < 0) {
                 DeleteMidQEntry(midQ);