smb3: add trace point for tree connection

In debugging certain scenarios, especially reconnect cases,
it can be helpful to have a dynamic trace point for the
result of tree connect.  See sample output below
from a reconnect event. The new event is 'smb3_tcon'

            TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
               | |       |   ||||       |         |
           cifsd-6071  [001] ....  2659.897923: smb3_reconnect: server=localhost current_mid=0xa
     kworker/1:1-71    [001] ....  2666.026342: smb3_cmd_done: 	sid=0x0 tid=0x0 cmd=0 mid=0
     kworker/1:1-71    [001] ....  2666.026576: smb3_cmd_err: 	sid=0xc49e1787 tid=0x0 cmd=1 mid=1 status=0xc0000016 rc=-5
     kworker/1:1-71    [001] ....  2666.031677: smb3_cmd_done: 	sid=0xc49e1787 tid=0x0 cmd=1 mid=2
     kworker/1:1-71    [001] ....  2666.031921: smb3_cmd_done: 	sid=0xc49e1787 tid=0x6e78f05f cmd=3 mid=3
     kworker/1:1-71    [001] ....  2666.031923: smb3_tcon: xid=0 sid=0xc49e1787 tid=0x0 unc_name=\\localhost\test rc=0
     kworker/1:1-71    [001] ....  2666.032097: smb3_cmd_done: 	sid=0xc49e1787 tid=0x6e78f05f cmd=11 mid=4
     kworker/1:1-71    [001] ....  2666.032265: smb3_cmd_done: 	sid=0xc49e1787 tid=0x7912332f cmd=3 mid=5
     kworker/1:1-71    [001] ....  2666.032266: smb3_tcon: xid=0 sid=0xc49e1787 tid=0x0 unc_name=\\localhost\IPC$ rc=0
     kworker/1:1-71    [001] ....  2666.032386: smb3_cmd_done: 	sid=0xc49e1787 tid=0x7912332f cmd=11 mid=6

Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 7d7b016fe8bb0e9edd5523a739e94e37db7291d6..a92d3840db9d5273ff2978eac326fd5e0bc36f67 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1512,7 +1512,7 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
        rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
        cifs_small_buf_release(req);
        rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
-
+       trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
        if (rc != 0) {
                if (tcon) {
                        cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
@@ -1559,6 +1559,7 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
        if (tcon->ses->server->ops->validate_negotiate)
                rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
 tcon_exit:
+
        free_rsp_buf(resp_buftype, rsp);
        kfree(unc_path);
        return rc;

diff --git a/fs/cifs/trace.h b/fs/cifs/trace.h
index cce8414fe7ec2b5e3af9c0660c6db033828cb86f..fb049809555fea9b3e2cc072b735ac0adfdfe1ae 100644 (file)
--- a/fs/cifs/trace.h
+++ b/fs/cifs/trace.h
@@ -373,6 +373,48 @@ DEFINE_EVENT(smb3_enter_exit_class, smb3_##name,  \
 DEFINE_SMB3_ENTER_EXIT_EVENT(enter);
 DEFINE_SMB3_ENTER_EXIT_EVENT(exit_done);
 
+/*
+ * For SMB2/SMB3 tree connect
+ */
+
+DECLARE_EVENT_CLASS(smb3_tcon_class,
+       TP_PROTO(unsigned int xid,
+               __u32   tid,
+               __u64   sesid,
+               const char *unc_name,
+               int     rc),
+       TP_ARGS(xid, tid, sesid, unc_name, rc),
+       TP_STRUCT__entry(
+               __field(unsigned int, xid)
+               __field(__u32, tid)
+               __field(__u64, sesid)
+               __field(const char *,  unc_name)
+               __field(int, rc)
+       ),
+       TP_fast_assign(
+               __entry->xid = xid;
+               __entry->tid = tid;
+               __entry->sesid = sesid;
+               __entry->unc_name = unc_name;
+               __entry->rc = rc;
+       ),
+       TP_printk("xid=%u sid=0x%llx tid=0x%x unc_name=%s rc=%d",
+               __entry->xid, __entry->sesid, __entry->tid,
+               __entry->unc_name, __entry->rc)
+)
+
+#define DEFINE_SMB3_TCON_EVENT(name)          \
+DEFINE_EVENT(smb3_tcon_class, smb3_##name,    \
+       TP_PROTO(unsigned int xid,              \
+               __u32   tid,                    \
+               __u64   sesid,                  \
+               const char *unc_name,           \
+               int     rc),                    \
+       TP_ARGS(xid, tid, sesid, unc_name, rc))
+
+DEFINE_SMB3_TCON_EVENT(tcon);
+
+
 /*
  * For smb2/smb3 open call
  */