[ 3.5.yuz extended stable ] Patch "libceph: don't use bio_iter as a flag" has been added to staging queue

Herton Ronaldo Krzesinski herton.krzesinski at canonical.com
Tue Nov 20 17:16:53 UTC 2012

This is a note to let you know that I have just added a patch titled

    libceph: don't use bio_iter as a flag

to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.yuz tree, see



>From 282f152ee1eab0457e4f64f65f106dac7ab9a988 Mon Sep 17 00:00:00 2001
From: Alex Elder <elder at inktank.com>
Date: Mon, 11 Jun 2012 14:57:13 -0500
Subject: [PATCH 31/78] libceph: don't use bio_iter as a flag

commit abdaa6a849af1d63153682c11f5bbb22dacb1f6b upstream.

Recently a bug was fixed in which the bio_iter field in a ceph
message was not being properly re-initialized when a message got
    commit 43643528cce60ca184fe8197efa8e8da7c89a037
    Author: Yan, Zheng <zheng.z.yan at intel.com>
    rbd: Clear ceph_msg->bio_iter for retransmitted message

We are now only initializing the bio_iter field when we are about to
start to write message data (in prepare_write_message_data()),
rather than every time we are attempting to write any portion of the
message data (in write_partial_msg_pages()).  This means we no
longer need to use the msg->bio_iter field as a flag.

So just don't do that any more.  Trust prepare_write_message_data()
to ensure msg->bio_iter is properly initialized, every time we are
about to begin writing (or re-writing) a message's bio data.

Signed-off-by: Alex Elder <elder at inktank.com>
Reviewed-by: Sage Weil <sage at inktank.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
 net/ceph/messenger.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index b83c963..d47305a 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -604,7 +604,7 @@ static void prepare_write_message_data(struct ceph_connection *con)
 		con->out_msg_pos.page_pos = 0;
-	if (msg->bio && !msg->bio_iter)
+	if (msg->bio)
 		init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
 	con->out_msg_pos.data_pos = 0;
@@ -672,10 +672,6 @@ static void prepare_write_message(struct ceph_connection *con)
 		m->hdr.seq = cpu_to_le64(++con->out_seq);
 		m->needs_out_seq = false;
-	else
-		m->bio_iter = NULL;

 	dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
 	     m, con->out_seq, le16_to_cpu(m->hdr.type),

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