libceph: add, don't set data for a message

Change the names of the functions that put data on a pagelist to
reflect that we're adding to whatever's already there rather than
just setting it to the one thing.  Currently only one data item is
ever added to a message, but that's about to change.

This resolves:
    http://tracker.ceph.com/issues/2770

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

fs/ceph/mds_client.c

@@ -1724,7 +1724,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
 	if (req->r_data_len) {
 		/* outbound data set only by ceph_sync_setxattr() */
 		BUG_ON(!req->r_pages);
-		ceph_msg_data_set_pages(msg, req->r_pages, req->r_data_len, 0);
+		ceph_msg_data_add_pages(msg, req->r_pages, req->r_data_len, 0);
 	}
 
 	msg->hdr.data_len = cpu_to_le32(req->r_data_len);
@@ -2608,7 +2608,7 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
 	if (pagelist->length) {
 		/* set up outbound data if we have any */
 		reply->hdr.data_len = cpu_to_le32(pagelist->length);
-		ceph_msg_data_set_pagelist(reply, pagelist);
+		ceph_msg_data_add_pagelist(reply, pagelist);
 	}
 	ceph_con_send(&session->s_con, reply);
 

include/linux/ceph/messenger.h

@@ -275,12 +275,12 @@ extern void ceph_msg_revoke_incoming(struct ceph_msg *msg);
 
 extern void ceph_con_keepalive(struct ceph_connection *con);
 
-extern void ceph_msg_data_set_pages(struct ceph_msg *msg, struct page **pages,
+extern void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
 				size_t length, size_t alignment);
-extern void ceph_msg_data_set_pagelist(struct ceph_msg *msg,
+extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
 				struct ceph_pagelist *pagelist);
 #ifdef CONFIG_BLOCK
-extern void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio,
+extern void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
 				size_t length);
 #endif /* CONFIG_BLOCK */
 

net/ceph/messenger.c

@@ -3005,7 +3005,7 @@ static void ceph_msg_data_destroy(struct ceph_msg_data *data)
 	kfree(data);
 }
 
-void ceph_msg_data_set_pages(struct ceph_msg *msg, struct page **pages,
+void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
 		size_t length, size_t alignment)
 {
 	struct ceph_msg_data *data;
@@ -3023,9 +3023,9 @@ void ceph_msg_data_set_pages(struct ceph_msg *msg, struct page **pages,
 	list_add_tail(&data->links, &msg->data);
 	msg->data_length += length;
 }
-EXPORT_SYMBOL(ceph_msg_data_set_pages);
+EXPORT_SYMBOL(ceph_msg_data_add_pages);
 
-void ceph_msg_data_set_pagelist(struct ceph_msg *msg,
+void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
 				struct ceph_pagelist *pagelist)
 {
 	struct ceph_msg_data *data;
@@ -3040,10 +3040,10 @@ void ceph_msg_data_set_pagelist(struct ceph_msg *msg,
 	list_add_tail(&data->links, &msg->data);
 	msg->data_length += pagelist->length;
 }
-EXPORT_SYMBOL(ceph_msg_data_set_pagelist);
+EXPORT_SYMBOL(ceph_msg_data_add_pagelist);
 
 #ifdef	CONFIG_BLOCK
-void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio,
+void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
 		size_t length)
 {
 	struct ceph_msg_data *data;
@@ -3058,7 +3058,7 @@ void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio,
 	list_add_tail(&data->links, &msg->data);
 	msg->data_length += length;
 }
-EXPORT_SYMBOL(ceph_msg_data_set_bio);
+EXPORT_SYMBOL(ceph_msg_data_add_bio);
 #endif	/* CONFIG_BLOCK */
 
 /*

net/ceph/osd_client.c

@@ -550,22 +550,22 @@ void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
 }
 EXPORT_SYMBOL(osd_req_op_watch_init);
 
-static void ceph_osdc_msg_data_set(struct ceph_msg *msg,
+static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
 				struct ceph_osd_data *osd_data)
 {
 	u64 length = ceph_osd_data_length(osd_data);
 
 	if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
 		BUG_ON(length > (u64) SIZE_MAX);
 		if (length)
-			ceph_msg_data_set_pages(msg, osd_data->pages,
+			ceph_msg_data_add_pages(msg, osd_data->pages,
 					length, osd_data->alignment);
 	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
 		BUG_ON(!length);
-		ceph_msg_data_set_pagelist(msg, osd_data->pagelist);
+		ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
 #ifdef CONFIG_BLOCK
 	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
-		ceph_msg_data_set_bio(msg, osd_data->bio, length);
+		ceph_msg_data_add_bio(msg, osd_data->bio, length);
 #endif
 	} else {
 		BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
@@ -600,18 +600,18 @@ static u64 osd_req_encode_op(struct ceph_osd_request *req,
 		dst->extent.truncate_seq =
 			cpu_to_le32(src->extent.truncate_seq);
 		if (src->op == CEPH_OSD_OP_WRITE)
-			ceph_osdc_msg_data_set(req->r_request,
+			ceph_osdc_msg_data_add(req->r_request,
 						&src->extent.osd_data);
 		else
-			ceph_osdc_msg_data_set(req->r_reply,
+			ceph_osdc_msg_data_add(req->r_reply,
 						&src->extent.osd_data);
 		break;
 	case CEPH_OSD_OP_CALL:
 		dst->cls.class_len = src->cls.class_len;
 		dst->cls.method_len = src->cls.method_len;
 		dst->cls.indata_len = cpu_to_le32(src->cls.request_data_len);
-		ceph_osdc_msg_data_set(req->r_reply, &src->cls.response_data);
-		ceph_osdc_msg_data_set(req->r_request, &src->cls.request_info);
+		ceph_osdc_msg_data_add(req->r_reply, &src->cls.response_data);
+		ceph_osdc_msg_data_add(req->r_request, &src->cls.request_info);
 		BUG_ON(src->cls.request_info.type !=
 					CEPH_OSD_DATA_TYPE_PAGELIST);
 		request_data_len = src->cls.request_info.pagelist->length;