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Commit 8a166d05 authored by Alex Elder's avatar Alex Elder Committed by Sage Weil
Browse files

libceph: more cleanup of write_partial_msg_pages() 



Basically all cases in write_partial_msg_pages() use the cursor, and
as a result we can simplify that function quite a bit.

Signed-off-by: default avatarAlex Elder <elder@inktank.com>
Reviewed-by: default avatarJosh Durgin <josh.durgin@inktank.com>
parent 9d2a06c2

net/ceph/messenger.c

+7 −14
Original line number Diff line number Diff line
@@ -1476,7 +1476,6 @@ static int write_partial_message_data(struct ceph_connection *con) 
	unsigned int data_len = le32_to_cpu(msg->hdr.data_len);

	bool do_datacrc = !con->msgr->nocrc;

	int ret;

	int total_max_write;



	dout("%s %p msg %p page %d offset %d\n", __func__,

	     con, msg, msg_pos->page, msg_pos->page_pos);
@@ -1490,36 +1489,30 @@ static int write_partial_message_data(struct ceph_connection *con) 
	 * been revoked, so use the zero page.

	 */

	while (data_len > msg_pos->data_pos) {

		struct page *page = NULL;

		struct page *page;

		size_t page_offset;

		size_t length;

		bool use_cursor = false;

		bool last_piece = true;	/* preserve existing behavior */



		total_max_write = data_len - msg_pos->data_pos;

		bool last_piece;



		if (ceph_msg_has_pages(msg)) {

			use_cursor = true;

			page = ceph_msg_data_next(&msg->p, &page_offset,

							&length, &last_piece);

		} else if (ceph_msg_has_pagelist(msg)) {

			use_cursor = true;

			page = ceph_msg_data_next(&msg->l, &page_offset,

							&length, &last_piece);

#ifdef CONFIG_BLOCK

		} else if (ceph_msg_has_bio(msg)) {

			use_cursor = true;

			page = ceph_msg_data_next(&msg->b, &page_offset,

							&length, &last_piece);

#endif

		} else {

			page = zero_page;

		}

		if (!use_cursor) {

			length = min_t(int, PAGE_SIZE - msg_pos->page_pos,

					    total_max_write);

			size_t resid = data_len - msg_pos->data_pos;



			page = zero_page;

			page_offset = msg_pos->page_pos;

			length = PAGE_SIZE - page_offset;

			length = min(resid, length);

			last_piece = length == resid;

		}

		if (do_datacrc && !msg_pos->did_page_crc) {

			u32 crc = le32_to_cpu(msg->footer.data_crc);