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Date: Wed, 21 Nov 2012 16:40:53 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
alan@...rguk.ukuu.org.uk, Alex Elder <elder@...tank.com>,
Sage Weil <sage@...tank.com>
Subject: [ 107/171] libceph: have messages point to their connection
3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alex Elder <elder@...tank.com>
(cherry picked from commit 38941f8031bf042dba3ced6394ba3a3b16c244ea)
When a ceph message is queued for sending it is placed on a list of
pending messages (ceph_connection->out_queue). When they are
actually sent over the wire, they are moved from that list to
another (ceph_connection->out_sent). When acknowledgement for the
message is received, it is removed from the sent messages list.
During that entire time the message is "in the possession" of a
single ceph connection. Keep track of that connection in the
message. This will be used in the next patch (and is a helpful
bit of information for debugging anyway).
Signed-off-by: Alex Elder <elder@...tank.com>
Reviewed-by: Sage Weil <sage@...tank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
include/linux/ceph/messenger.h | 3 +++
net/ceph/messenger.c | 27 +++++++++++++++++++++++++--
2 files changed, 28 insertions(+), 2 deletions(-)
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -77,7 +77,10 @@ struct ceph_msg {
unsigned nr_pages; /* size of page array */
unsigned page_alignment; /* io offset in first page */
struct ceph_pagelist *pagelist; /* instead of pages */
+
+ struct ceph_connection *con;
struct list_head list_head;
+
struct kref kref;
struct bio *bio; /* instead of pages/pagelist */
struct bio *bio_iter; /* bio iterator */
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -414,6 +414,9 @@ static int con_close_socket(struct ceph_
static void ceph_msg_remove(struct ceph_msg *msg)
{
list_del_init(&msg->list_head);
+ BUG_ON(msg->con == NULL);
+ msg->con = NULL;
+
ceph_msg_put(msg);
}
static void ceph_msg_remove_list(struct list_head *head)
@@ -433,6 +436,8 @@ static void reset_connection(struct ceph
ceph_msg_remove_list(&con->out_sent);
if (con->in_msg) {
+ BUG_ON(con->in_msg->con != con);
+ con->in_msg->con = NULL;
ceph_msg_put(con->in_msg);
con->in_msg = NULL;
}
@@ -625,8 +630,10 @@ static void prepare_write_message(struct
&con->out_temp_ack);
}
+ BUG_ON(list_empty(&con->out_queue));
m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
con->out_msg = m;
+ BUG_ON(m->con != con);
/* put message on sent list */
ceph_msg_get(m);
@@ -1810,6 +1817,8 @@ static int read_partial_message(struct c
"error allocating memory for incoming message";
return -ENOMEM;
}
+
+ BUG_ON(con->in_msg->con != con);
m = con->in_msg;
m->front.iov_len = 0; /* haven't read it yet */
if (m->middle)
@@ -1905,6 +1914,8 @@ static void process_message(struct ceph_
{
struct ceph_msg *msg;
+ BUG_ON(con->in_msg->con != con);
+ con->in_msg->con = NULL;
msg = con->in_msg;
con->in_msg = NULL;
@@ -2264,6 +2275,8 @@ static void ceph_fault(struct ceph_conne
con_close_socket(con);
if (con->in_msg) {
+ BUG_ON(con->in_msg->con != con);
+ con->in_msg->con = NULL;
ceph_msg_put(con->in_msg);
con->in_msg = NULL;
}
@@ -2382,6 +2395,8 @@ void ceph_con_send(struct ceph_connectio
/* queue */
mutex_lock(&con->mutex);
+ BUG_ON(msg->con != NULL);
+ msg->con = con;
BUG_ON(!list_empty(&msg->list_head));
list_add_tail(&msg->list_head, &con->out_queue);
dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
@@ -2407,13 +2422,16 @@ void ceph_con_revoke(struct ceph_connect
{
mutex_lock(&con->mutex);
if (!list_empty(&msg->list_head)) {
- dout("con_revoke %p msg %p - was on queue\n", con, msg);
+ dout("%s %p msg %p - was on queue\n", __func__, con, msg);
list_del_init(&msg->list_head);
+ BUG_ON(msg->con == NULL);
+ msg->con = NULL;
+
ceph_msg_put(msg);
msg->hdr.seq = 0;
}
if (con->out_msg == msg) {
- dout("con_revoke %p msg %p - was sending\n", con, msg);
+ dout("%s %p msg %p - was sending\n", __func__, con, msg);
con->out_msg = NULL;
if (con->out_kvec_is_msg) {
con->out_skip = con->out_kvec_bytes;
@@ -2482,6 +2500,8 @@ struct ceph_msg *ceph_msg_new(int type,
if (m == NULL)
goto out;
kref_init(&m->kref);
+
+ m->con = NULL;
INIT_LIST_HEAD(&m->list_head);
m->hdr.tid = 0;
@@ -2602,6 +2622,8 @@ static bool ceph_con_in_msg_alloc(struct
mutex_unlock(&con->mutex);
con->in_msg = con->ops->alloc_msg(con, hdr, &skip);
mutex_lock(&con->mutex);
+ if (con->in_msg)
+ con->in_msg->con = con;
if (skip)
con->in_msg = NULL;
@@ -2615,6 +2637,7 @@ static bool ceph_con_in_msg_alloc(struct
type, front_len);
return false;
}
+ con->in_msg->con = con;
con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
}
memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
--
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