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Commit 78625051 authored by Alex Elder's avatar Alex Elder Committed by Sage Weil
Browse files

libceph: consolidate message prep code 



In prepare_write_message_data(), various fields are initialized in
preparation for writing message data out.  Meanwhile, in
read_partial_message(), there is essentially the same block of code,
operating on message variables associated with an incoming message.

Generalize prepare_write_message_data() so it works for both
incoming and outcoming messages, and use it in both spots.  The
did_page_crc is not used for input (so it's harmless to initialize
it).

Signed-off-by: default avatarAlex Elder <elder@inktank.com>
Reviewed-by: default avatarJosh Durgin <josh.durgin@inktank.com>
parent bae6acd9

net/ceph/messenger.c

+10 −18
Original line number Diff line number Diff line
@@ -722,11 +722,9 @@ static void iter_bio_next(struct bio **bio_iter, unsigned int *seg) 
}

#endif



static void prepare_write_message_data(struct ceph_connection *con)

static void prepare_message_data(struct ceph_msg *msg,

				struct ceph_msg_pos *msg_pos)

{

	struct ceph_msg *msg = con->out_msg;

	struct ceph_msg_pos *msg_pos = &con->out_msg_pos;



	BUG_ON(!msg);

	BUG_ON(!msg->hdr.data_len);
@@ -742,7 +740,6 @@ static void prepare_write_message_data(struct ceph_connection *con) 
#endif

	msg_pos->data_pos = 0;

	msg_pos->did_page_crc = false;

	con->out_more = 1;  /* data + footer will follow */

}



/*
@@ -840,11 +837,13 @@ static void prepare_write_message(struct ceph_connection *con) 


	/* is there a data payload? */

	con->out_msg->footer.data_crc = 0;

	if (m->hdr.data_len)

		prepare_write_message_data(con);

	else

	if (m->hdr.data_len) {

		prepare_message_data(con->out_msg, &con->out_msg_pos);

		con->out_more = 1;  /* data + footer will follow */

	} else {

		/* no, queue up footer too and be done */

		prepare_write_message_footer(con);

	}



	con_flag_set(con, CON_FLAG_WRITE_PENDING);

}
@@ -1956,17 +1955,10 @@ static int read_partial_message(struct ceph_connection *con) 
		if (m->middle)

			m->middle->vec.iov_len = 0;



		msg_pos->page = 0;

		if (m->pages)

			msg_pos->page_pos = m->page_alignment;

		else

			msg_pos->page_pos = 0;

		msg_pos->data_pos = 0;

		/* prepare for data payload, if any */



#ifdef CONFIG_BLOCK

		if (m->bio)

			init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);

#endif

		if (data_len)

			prepare_message_data(con->in_msg, &con->in_msg_pos);

	}



	/* front */