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: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 7788170..e8fa449 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -722,11 +722,9 @@
}
#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 @@
#endif
msg_pos->data_pos = 0;
msg_pos->did_page_crc = false;
- con->out_more = 1; /* data + footer will follow */
}
/*
@@ -840,11 +837,13 @@
/* 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 @@
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 */