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libceph: encapsulate out message data setup

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Move the code that prepares to write the data portion of a message
into its own function.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Alex Elder 2012-06-11 14:57:13 -05:00 committed by Sage Weil
parent d59315ca8c
commit 739c905baa
1 changed files with 23 additions and 14 deletions
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37
net/ceph/messenger.c
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@ -565,6 +565,24 @@ static void con_out_kvec_add(struct ceph_connection *con,
con->out_kvec_bytes += size;
}
static void prepare_write_message_data(struct ceph_connection *con)
{
struct ceph_msg *msg = con->out_msg;
BUG_ON(!msg);
BUG_ON(!msg->hdr.data_len);
/* initialize page iterator */
con->out_msg_pos.page = 0;
if (msg->pages)
con->out_msg_pos.page_pos = msg->page_alignment;
else
con->out_msg_pos.page_pos = 0;
con->out_msg_pos.data_pos = 0;
con->out_msg_pos.did_page_crc = false;
con->out_more = 1; /* data + footer will follow */
}
/*
* Prepare footer for currently outgoing message, and finish things
* off. Assumes out_kvec* are already valid.. we just add on to the end.
@ -657,26 +675,17 @@ static void prepare_write_message(struct ceph_connection *con)
con->out_msg->footer.middle_crc = cpu_to_le32(crc);
} else
con->out_msg->footer.middle_crc = 0;
con->out_msg->footer.data_crc = 0;
dout("prepare_write_message front_crc %u data_crc %u\n",
dout("%s front_crc %u middle_crc %u\n", __func__,
le32_to_cpu(con->out_msg->footer.front_crc),
le32_to_cpu(con->out_msg->footer.middle_crc));
/* is there a data payload? */
if (le32_to_cpu(m->hdr.data_len) > 0) {
/* initialize page iterator */
con->out_msg_pos.page = 0;
if (m->pages)
con->out_msg_pos.page_pos = m->page_alignment;
else
con->out_msg_pos.page_pos = 0;
con->out_msg_pos.data_pos = 0;
con->out_msg_pos.did_page_crc = false;
con->out_more = 1; /* data + footer will follow */
} else {
con->out_msg->footer.data_crc = 0;
if (m->hdr.data_len)
prepare_write_message_data(con);
else
/* no, queue up footer too and be done */
prepare_write_message_footer(con);
}
set_bit(WRITE_PENDING, &con->flags);
}