cifs: add cifs_call_async
Jeff Layton [Tue, 11 Jan 2011 12:24:21 +0000 (07:24 -0500)]
Add a function that will send a request, and set up the mid for an
async reply.

Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifsproto.h
fs/cifs/transport.c

index 95d5dbb..7f2988b 100644 (file)
@@ -61,6 +61,11 @@ extern char *cifs_compose_mount_options(const char *sb_mountdata,
                const char *fullpath, const struct dfs_info3_param *ref,
                char **devname);
 /* extern void renew_parental_timestamps(struct dentry *direntry);*/
+extern struct mid_q_entry *AllocMidQEntry(const struct smb_hdr *smb_buffer,
+                                       struct TCP_Server_Info *server);
+extern int cifs_call_async(struct TCP_Server_Info *server,
+                          struct smb_hdr *in_buf, mid_callback_t *callback,
+                          void *cbdata);
 extern int SendReceive(const unsigned int /* xid */ , struct cifsSesInfo *,
                        struct smb_hdr * /* input */ ,
                        struct smb_hdr * /* out */ ,
index d77b615..166b65a 100644 (file)
@@ -42,7 +42,7 @@ wake_up_task(struct mid_q_entry *mid)
        wake_up_process(mid->callback_data);
 }
 
-static struct mid_q_entry *
+struct mid_q_entry *
 AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
 {
        struct mid_q_entry *temp;
@@ -345,6 +345,62 @@ wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
 
 
 /*
+ * Send a SMB request and set the callback function in the mid to handle
+ * the result. Caller is responsible for dealing with timeouts.
+ */
+int
+cifs_call_async(struct TCP_Server_Info *server, struct smb_hdr *in_buf,
+               mid_callback_t *callback, void *cbdata)
+{
+       int rc;
+       struct mid_q_entry *mid;
+
+       rc = wait_for_free_request(server, CIFS_ASYNC_OP);
+       if (rc)
+               return rc;
+
+       mutex_lock(&server->srv_mutex);
+       mid = AllocMidQEntry(in_buf, server);
+       if (mid == NULL) {
+               mutex_unlock(&server->srv_mutex);
+               return -ENOMEM;
+       }
+
+       /* put it on the pending_mid_q */
+       spin_lock(&GlobalMid_Lock);
+       list_add_tail(&mid->qhead, &server->pending_mid_q);
+       spin_unlock(&GlobalMid_Lock);
+
+       rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
+       if (rc) {
+               mutex_unlock(&server->srv_mutex);
+               goto out_err;
+       }
+
+       mid->callback = callback;
+       mid->callback_data = cbdata;
+       mid->midState = MID_REQUEST_SUBMITTED;
+#ifdef CONFIG_CIFS_STATS2
+       atomic_inc(&server->inSend);
+#endif
+       rc = smb_send(server, in_buf, in_buf->smb_buf_length);
+#ifdef CONFIG_CIFS_STATS2
+       atomic_dec(&server->inSend);
+       mid->when_sent = jiffies;
+#endif
+       mutex_unlock(&server->srv_mutex);
+       if (rc)
+               goto out_err;
+
+       return rc;
+out_err:
+       delete_mid(mid);
+       atomic_dec(&server->inFlight);
+       wake_up(&server->request_q);
+       return rc;
+}
+
+/*
  *
  * Send an SMB Request.  No response info (other than return code)
  * needs to be parsed.