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cifs: don't send an echo request unless NegProt has been done

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When the socket to the server is disconnected, the client more or less
immediately calls cifs_reconnect to reconnect the socket. The NegProt
and SessSetup however are not done until an actual call needs to be
made.

With the addition of the SMB echo code, it's possible that the server
will initiate a disconnect on an idle socket. The client will then
reconnect the socket but no NegotiateProtocol request is done. The
SMBEcho workqueue job will then eventually pop, and an SMBEcho will be
sent on the socket. The server will then reject it since no NegProt was
done.

The ideal fix would be to either have the socket not be reconnected
until we plan to use it, or to immediately do a NegProt when the
reconnect occurs. The code is not structured for this however. For now
we must just settle for not sending any echoes until the NegProt is
done.

Reported-by: JG <jg@cms.ac>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2011-02-04 17:09:50 -05:00 committed by Steve French
parent e3f0dadb2b
commit 247ec9b418
1 changed files with 6 additions and 2 deletions
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8
fs/cifs/connect.c
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@ -337,8 +337,12 @@ cifs_echo_request(struct work_struct *work)
struct TCP_Server_Info *server = container_of(work,
struct TCP_Server_Info, echo.work);
/* no need to ping if we got a response recently */
if (time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
/*
* We cannot send an echo until the NEGOTIATE_PROTOCOL request is done.
* Also, no need to ping if we got a response recently
*/
if (server->tcpStatus != CifsGood ||
time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
goto requeue_echo;
rc = CIFSSMBEcho(server);