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Message-Id: <20121122004044.397270484@linuxfoundation.org>
Date: Wed, 21 Nov 2012 16:40:56 -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: [ 110/171] libceph: make ceph_con_revoke_message() a msg op
3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alex Elder <elder@...tank.com>
(cherry picked from commit 8921d114f5574c6da2cdd00749d185633ecf88f3)
ceph_con_revoke_message() is passed both a message and a ceph
connection. A ceph_msg allocated for incoming messages on a
connection always has a pointer to that connection, so there's no
need to provide the connection when revoking such a message.
Note that the existing logic does not preclude the message supplied
being a null/bogus message pointer. The only user of this interface
is the OSD client, and the only value an osd client passes is a
request's r_reply field. That is always non-null (except briefly in
an error path in ceph_osdc_alloc_request(), and that drops the
only reference so the request won't ever have a reply to revoke).
So we can safely assume the passed-in message is non-null, but add a
BUG_ON() to make it very obvious we are imposing this restriction.
Rename the function ceph_msg_revoke_incoming() to reflect that it is
really an operation on an incoming message.
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 | 4 ++--
net/ceph/messenger.c | 22 ++++++++++++++++------
net/ceph/osd_client.c | 9 ++++-----
3 files changed, 22 insertions(+), 13 deletions(-)
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -233,8 +233,8 @@ extern void ceph_con_close(struct ceph_c
extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
extern void ceph_msg_revoke(struct ceph_msg *msg);
-extern void ceph_con_revoke_message(struct ceph_connection *con,
- struct ceph_msg *msg);
+extern void ceph_msg_revoke_incoming(struct ceph_msg *msg);
+
extern void ceph_con_keepalive(struct ceph_connection *con);
extern struct ceph_connection *ceph_con_get(struct ceph_connection *con);
extern void ceph_con_put(struct ceph_connection *con);
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -2460,17 +2460,27 @@ void ceph_msg_revoke(struct ceph_msg *ms
/*
* Revoke a message that we may be reading data into
*/
-void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
+void ceph_msg_revoke_incoming(struct ceph_msg *msg)
{
+ struct ceph_connection *con;
+
+ BUG_ON(msg == NULL);
+ if (!msg->con) {
+ dout("%s msg %p null con\n", __func__, msg);
+
+ return; /* Message not in our possession */
+ }
+
+ con = msg->con;
mutex_lock(&con->mutex);
- if (con->in_msg && con->in_msg == msg) {
+ if (con->in_msg == msg) {
unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
/* skip rest of message */
- dout("con_revoke_pages %p msg %p revoked\n", con, msg);
- con->in_base_pos = con->in_base_pos -
+ dout("%s %p msg %p revoked\n", __func__, con, msg);
+ con->in_base_pos = con->in_base_pos -
sizeof(struct ceph_msg_header) -
front_len -
middle_len -
@@ -2481,8 +2491,8 @@ void ceph_con_revoke_message(struct ceph
con->in_tag = CEPH_MSGR_TAG_READY;
con->in_seq++;
} else {
- dout("con_revoke_pages %p msg %p pages %p no-op\n",
- con, con->in_msg, msg);
+ dout("%s %p in_msg %p msg %p no-op\n",
+ __func__, con, con->in_msg, msg);
}
mutex_unlock(&con->mutex);
}
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -140,10 +140,9 @@ void ceph_osdc_release_request(struct kr
if (req->r_request)
ceph_msg_put(req->r_request);
if (req->r_con_filling_msg) {
- dout("release_request revoking pages %p from con %p\n",
+ dout("%s revoking pages %p from con %p\n", __func__,
req->r_pages, req->r_con_filling_msg);
- ceph_con_revoke_message(req->r_con_filling_msg,
- req->r_reply);
+ ceph_msg_revoke_incoming(req->r_reply);
req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
}
if (req->r_reply)
@@ -2022,9 +2021,9 @@ static struct ceph_msg *get_reply(struct
}
if (req->r_con_filling_msg) {
- dout("get_reply revoking msg %p from old con %p\n",
+ dout("%s revoking msg %p from old con %p\n", __func__,
req->r_reply, req->r_con_filling_msg);
- ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
+ ceph_msg_revoke_incoming(req->r_reply);
req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
req->r_con_filling_msg = NULL;
}
--
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