[PATCH v6 2/9] cifs: Make smb1's SendReceive() wrap cifs_send_recv()

[David Howells <dhowells@redhat.com>]

Make the smb1 transport's SendReceive() simply wrap cifs_send_recv() as
does SendReceive2().  This will then allow that to pick up the transport
changes there.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Paulo Alcantara <pc@manguebit.org>
cc: Shyam Prasad N <sprasad@microsoft.com>
cc: Tom Talpey <tom@talpey.com>
cc: linux-cifs@vger.kernel.org
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
---
 fs/smb/client/cifstransport.c | 82 +++++------------------------------
 1 file changed, 10 insertions(+), 72 deletions(-)

diff --git a/fs/smb/client/cifstransport.c b/fs/smb/client/cifstransport.c
index d12578b37179..1a28d361b1f7 100644
--- a/fs/smb/client/cifstransport.c
+++ b/fs/smb/client/cifstransport.c
@@ -236,12 +236,12 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
 	    struct smb_hdr *in_buf, unsigned int in_len,
 	    struct smb_hdr *out_buf, int *pbytes_returned, const int flags)
 {
-	int rc = 0;
-	struct mid_q_entry *mid;
+	struct TCP_Server_Info *server;
+	struct kvec resp_iov = {};
 	struct kvec iov = { .iov_base = in_buf, .iov_len = in_len };
 	struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 };
-	struct cifs_credits credits = { .value = 1, .instance = 0 };
-	struct TCP_Server_Info *server;
+	int resp_buf_type;
+	int rc = 0;
 
 	if (WARN_ON_ONCE(in_len > 0xffffff))
 		return -EIO;
@@ -272,77 +272,15 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
 		return -EIO;
 	}
 
-	rc = wait_for_free_request(server, flags, &credits.instance);
-	if (rc)
-		return rc;
-
-	/* make sure that we sign in the same order that we send on this socket
-	   and avoid races inside tcp sendmsg code that could cause corruption
-	   of smb data */
-
-	cifs_server_lock(server);
-
-	rc = allocate_mid(ses, in_buf, &mid);
-	if (rc) {
-		cifs_server_unlock(server);
-		/* Update # of requests on wire to server */
-		add_credits(server, &credits, 0);
-		return rc;
-	}
-
-	rc = cifs_sign_smb(in_buf, in_len, server, &mid->sequence_number);
-	if (rc) {
-		cifs_server_unlock(server);
-		goto out;
-	}
-
-	mid->mid_state = MID_REQUEST_SUBMITTED;
-
-	rc = smb_send(server, in_buf, in_len);
-	cifs_save_when_sent(mid);
-
-	if (rc < 0)
-		server->sequence_number -= 2;
-
-	cifs_server_unlock(server);
-
+	rc = cifs_send_recv(xid, ses, ses->server,
+			    &rqst, &resp_buf_type, flags, &resp_iov);
 	if (rc < 0)
-		goto out;
-
-	rc = wait_for_response(server, mid);
-	if (rc != 0) {
-		send_cancel(server, &rqst, mid);
-		spin_lock(&mid->mid_lock);
-		if (mid->callback) {
-			/* no longer considered to be "in-flight" */
-			mid->callback = release_mid;
-			spin_unlock(&mid->mid_lock);
-			add_credits(server, &credits, 0);
-			return rc;
-		}
-		spin_unlock(&mid->mid_lock);
-	}
-
-	rc = cifs_sync_mid_result(mid, server);
-	if (rc != 0) {
-		add_credits(server, &credits, 0);
 		return rc;
-	}
-
-	if (!mid->resp_buf || !out_buf ||
-	    mid->mid_state != MID_RESPONSE_READY) {
-		rc = -EIO;
-		cifs_server_dbg(VFS, "Bad MID state?\n");
-		goto out;
-	}
-
-	*pbytes_returned = mid->response_pdu_len;
-	memcpy(out_buf, mid->resp_buf, *pbytes_returned);
-	rc = cifs_check_receive(mid, server, 0);
-out:
-	delete_mid(mid);
-	add_credits(server, &credits, 0);
 
+	*pbytes_returned = resp_iov.iov_len;
+	if (resp_iov.iov_len)
+		memcpy(out_buf, resp_iov.iov_base, resp_iov.iov_len);
+	free_rsp_buf(resp_buf_type, resp_iov.iov_base);
 	return rc;
 }