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Commit 98ad5ebd authored by Ilya Dryomov's avatar Ilya Dryomov
Browse files

libceph: ceph_connection_operations::reencode_message() method 



Give upper layers a chance to reencode the message after the connection
is negotiated and ->peer_features is set.  OSD client will use this to
support both luminous and pre-luminous OSDs (in a single cluster): the
former need MOSDOp v8; the latter will continue to be sent MOSDOp v4.

Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 2e59ffd1

include/linux/ceph/messenger.h

+2 −0
Original line number Diff line number Diff line
@@ -44,6 +44,8 @@ struct ceph_connection_operations { 
					struct ceph_msg_header *hdr,

					int *skip);



	void (*reencode_message) (struct ceph_msg *msg);



	int (*sign_message) (struct ceph_msg *msg);

	int (*check_message_signature) (struct ceph_msg *msg);

};

net/ceph/messenger.c

+5 −2
Original line number Diff line number Diff line
@@ -1288,13 +1288,16 @@ static void prepare_write_message(struct ceph_connection *con) 
		m->hdr.seq = cpu_to_le64(++con->out_seq);

		m->needs_out_seq = false;

	}

	WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));



	if (con->ops->reencode_message)

		con->ops->reencode_message(m);



	dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",

	     m, con->out_seq, le16_to_cpu(m->hdr.type),

	     le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),

	     m->data_length);

	BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);

	WARN_ON(m->front.iov_len != le32_to_cpu(m->hdr.front_len));

	WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));



	/* tag + hdr + front + middle */

	con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);