cifs: add cifs_call_async
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>
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 95d5dbb..7f2988b 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -61,6 +61,11 @@
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 */ ,
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index d77b615..166b65a 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -42,7 +42,7 @@
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 @@
/*
+ * 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.