diff options
Diffstat (limited to 'fs/cifs/cifssmb.c')
| -rw-r--r-- | fs/cifs/cifssmb.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 3652cc60314..54b9f5d8d1d 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -706,6 +706,53 @@ CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon) return rc; } +/* + * This is a no-op for now. We're not really interested in the reply, but + * rather in the fact that the server sent one and that server->lstrp + * gets updated. + * + * FIXME: maybe we should consider checking that the reply matches request? + */ +static void +cifs_echo_callback(struct mid_q_entry *mid) +{ + struct TCP_Server_Info *server = mid->callback_data; + + DeleteMidQEntry(mid); + atomic_dec(&server->inFlight); + wake_up(&server->request_q); +} + +int +CIFSSMBEcho(struct TCP_Server_Info *server) +{ + ECHO_REQ *smb; + int rc = 0; + + cFYI(1, "In echo request"); + + rc = small_smb_init(SMB_COM_ECHO, 0, NULL, (void **)&smb); + if (rc) + return rc; + + /* set up echo request */ + smb->hdr.Tid = cpu_to_le16(0xffff); + smb->hdr.WordCount = cpu_to_le16(1); + smb->EchoCount = cpu_to_le16(1); + smb->ByteCount = cpu_to_le16(1); + smb->Data[0] = 'a'; + smb->hdr.smb_buf_length += 3; + + rc = cifs_call_async(server, (struct smb_hdr *)smb, + cifs_echo_callback, server); + if (rc) + cFYI(1, "Echo request failed: %d", rc); + + cifs_small_buf_release(smb); + + return rc; +} + int CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses) { |