ceph: simplify ceph_msg_new

We only need to pass in front_len.  Callers can attach any other payload
pieces (middle, data) as they see fit.
Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/caps.c

@@ -938,7 +938,7 @@ static int send_cap_msg(struct ceph_mds_session *session,
 	     seq, issue_seq, mseq, follows, size, max_size,
 	     xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
 
-	msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), 0, 0, NULL);
+	msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc));
 	if (!msg)
 		return -ENOMEM;
 

fs/ceph/mds_client.c

@@ -665,7 +665,7 @@ static struct ceph_msg *create_session_msg(u32 op, u64 seq)
 	struct ceph_msg *msg;
 	struct ceph_mds_session_head *h;
 
-	msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), 0, 0, NULL);
+	msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h));
 	if (!msg) {
 		pr_err("create_session_msg ENOMEM creating msg\n");
 		return NULL;
@@ -1051,8 +1051,7 @@ static int add_cap_releases(struct ceph_mds_client *mdsc,
 
 	while (session->s_num_cap_releases < session->s_nr_caps + extra) {
 		spin_unlock(&session->s_cap_lock);
-		msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
-				   0, 0, NULL);
+		msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE);
 		if (!msg)
 			goto out_unlocked;
 		dout("add_cap_releases %p msg %p now %d\n", session, msg,
@@ -1418,7 +1417,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
 	if (req->r_old_dentry_drop)
 		len += req->r_old_dentry->d_name.len;
 
-	msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, 0, 0, NULL);
+	msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len);
 	if (!msg) {
 		msg = ERR_PTR(-ENOMEM);
 		goto out_free2;
@@ -2154,7 +2153,7 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc, int mds)
 	ceph_pagelist_init(pagelist);
 
 	err = -ENOMEM;
-	reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, 0, 0, NULL);
+	reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0);
 	if (!reply)
 		goto fail_nomsg;
 
@@ -2462,7 +2461,7 @@ void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
 	dnamelen = dentry->d_name.len;
 	len += dnamelen;
 
-	msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, 0, 0, NULL);
+	msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len);
 	if (!msg)
 		return;
 	lease = msg->front.iov_base;

fs/ceph/messenger.c

@@ -2081,8 +2081,7 @@ void ceph_con_keepalive(struct ceph_connection *con)
  * construct a new message with given type, size
  * the new msg has a ref count of 1.
  */
-struct ceph_msg *ceph_msg_new(int type, int front_len,
-			      int page_len, int page_off, struct page **pages)
+struct ceph_msg *ceph_msg_new(int type, int front_len)
 {
 	struct ceph_msg *m;
 
@@ -2098,8 +2097,8 @@ struct ceph_msg *ceph_msg_new(int type, int front_len,
 	m->hdr.version = 0;
 	m->hdr.front_len = cpu_to_le32(front_len);
 	m->hdr.middle_len = 0;
-	m->hdr.data_len = cpu_to_le32(page_len);
-	m->hdr.data_off = cpu_to_le16(page_off);
+	m->hdr.data_len = 0;
+	m->hdr.data_off = 0;
 	m->hdr.reserved = 0;
 	m->footer.front_crc = 0;
 	m->footer.middle_crc = 0;
@@ -2133,18 +2132,17 @@ struct ceph_msg *ceph_msg_new(int type, int front_len,
 	m->middle = NULL;
 
 	/* data */
-	m->nr_pages = calc_pages_for(page_off, page_len);
-	m->pages = pages;
+	m->nr_pages = 0;
+	m->pages = NULL;
 	m->pagelist = NULL;
 
-	dout("ceph_msg_new %p page %d~%d -> %d\n", m, page_off, page_len,
-	     m->nr_pages);
+	dout("ceph_msg_new %p front %d\n", m, front_len);
 	return m;
 
 out2:
 	ceph_msg_put(m);
 out:
-	pr_err("msg_new can't create type %d len %d\n", type, front_len);
+	pr_err("msg_new can't create type %d front %d\n", type, front_len);
 	return NULL;
 }
 
@@ -2193,7 +2191,7 @@ static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
 	}
 	if (!msg) {
 		*skip = 0;
-		msg = ceph_msg_new(type, front_len, 0, 0, NULL);
+		msg = ceph_msg_new(type, front_len);
 		if (!msg) {
 			pr_err("unable to allocate msg type %d len %d\n",
 			       type, front_len);
@@ -2202,7 +2200,7 @@ static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
 	}
 	memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
 
-	if (middle_len) {
+	if (middle_len && !msg->middle) {
 		ret = ceph_alloc_middle(con, msg);
 		if (ret < 0) {
 			ceph_msg_put(msg);

fs/ceph/messenger.h

@@ -234,9 +234,7 @@ extern void ceph_con_keepalive(struct ceph_connection *con);
 extern struct ceph_connection *ceph_con_get(struct ceph_connection *con);
 extern void ceph_con_put(struct ceph_connection *con);
 
-extern struct ceph_msg *ceph_msg_new(int type, int front_len,
-				     int page_len, int page_off,
-				     struct page **pages);
+extern struct ceph_msg *ceph_msg_new(int type, int front_len);
 extern void ceph_msg_kfree(struct ceph_msg *m);
 
 

fs/ceph/mon_client.c

@@ -191,7 +191,7 @@ static void __send_subscribe(struct ceph_mon_client *monc)
 		struct ceph_mon_subscribe_item *i;
 		void *p, *end;
 
-		msg = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, 0, 0, NULL);
+		msg = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96);
 		if (!msg)
 			return;
 
@@ -491,10 +491,10 @@ int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
 	init_completion(&req->completion);
 
 	err = -ENOMEM;
-	req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), 0, 0, NULL);
+	req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h));
 	if (!req->request)
 		goto out;
-	req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, 0, 0, NULL);
+	req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024);
 	if (!req->reply)
 		goto out;
 
@@ -633,17 +633,15 @@ int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
 	/* msg pools */
 	err = -ENOMEM;
 	monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
-				     sizeof(struct ceph_mon_subscribe_ack),
-				     0, 0, NULL);
+				     sizeof(struct ceph_mon_subscribe_ack));
 	if (!monc->m_subscribe_ack)
 		goto out_monmap;
 
-	monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, 0, 0,
-					  NULL);
+	monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096);
 	if (!monc->m_auth_reply)
 		goto out_subscribe_ack;
 
-	monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, 0, 0, NULL);
+	monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096);
 	monc->pending_auth = 0;
 	if (!monc->m_auth)
 		goto out_auth_reply;
@@ -818,7 +816,7 @@ static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
 	case CEPH_MSG_MON_MAP:
 	case CEPH_MSG_MDS_MAP:
 	case CEPH_MSG_OSD_MAP:
-		m = ceph_msg_new(type, front_len, 0, 0, NULL);
+		m = ceph_msg_new(type, front_len);
 		break;
 	}
 

fs/ceph/msgpool.c

@@ -11,7 +11,7 @@ static void *alloc_fn(gfp_t gfp_mask, void *arg)
 {
 	struct ceph_msgpool *pool = arg;
 
-	return ceph_msg_new(0, pool->front_len, 0, 0, NULL);
+	return ceph_msg_new(0, pool->front_len);
 }
 
 static void free_fn(void *element, void *arg)
@@ -43,7 +43,7 @@ struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
 		WARN_ON(1);
 
 		/* try to alloc a fresh message */
-		return ceph_msg_new(0, front_len, 0, 0, NULL);
+		return ceph_msg_new(0, front_len);
 	}
 
 	return mempool_alloc(pool->pool, GFP_NOFS);

fs/ceph/osd_client.c

@@ -164,7 +164,7 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 		msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 	else
 		msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
-				   OSD_OPREPLY_FRONT_LEN, 0, 0, NULL);
+				   OSD_OPREPLY_FRONT_LEN);
 	if (!msg) {
 		ceph_osdc_put_request(req);
 		return NULL;
@@ -178,7 +178,7 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 	if (use_mempool)
 		msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 	else
-		msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, 0, 0, NULL);
+		msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size);
 	if (!msg) {
 		ceph_osdc_put_request(req);
 		return NULL;
@@ -1392,7 +1392,7 @@ static struct ceph_msg *get_reply(struct ceph_connection *con,
 	if (front > req->r_reply->front.iov_len) {
 		pr_warning("get_reply front %d > preallocated %d\n",
 			   front, (int)req->r_reply->front.iov_len);
-		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, 0, 0, NULL);
+		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front);
 		if (!m)
 			goto out;
 		ceph_msg_put(req->r_reply);
@@ -1435,7 +1435,7 @@ static struct ceph_msg *alloc_msg(struct ceph_connection *con,
 
 	switch (type) {
 	case CEPH_MSG_OSD_MAP:
-		return ceph_msg_new(type, front, 0, 0, NULL);
+		return ceph_msg_new(type, front);
 	case CEPH_MSG_OSD_OPREPLY:
 		return get_reply(con, hdr, skip);
 	default: