Patchwork [3.5.yuz,extended,stable] Patch "libceph: set CLOSED state bit in con_init" has been added to staging queue

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Submitter Herton Ronaldo Krzesinski
Date Nov. 20, 2012, 5:15 p.m.
Message ID <1353431725-7440-1-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/200416/
State New
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Comments

Herton Ronaldo Krzesinski - Nov. 20, 2012, 5:15 p.m.
This is a note to let you know that I have just added a patch titled

    libceph: set CLOSED state bit in con_init

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

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

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
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

From c87d5dcc64e89009a18a32cd4f8f8bfa4293f4c8 Mon Sep 17 00:00:00 2001
From: Alex Elder <elder@inktank.com>
Date: Tue, 29 May 2012 11:04:58 -0500
Subject: [PATCH 09/78] libceph: set CLOSED state bit in con_init

commit a5988c490ef66cb04ea2f610681949b25c773b3c upstream.

Once a connection is fully initialized, it is really in a CLOSED
state, so make that explicit by setting the bit in its state field.

It is possible for a connection in NEGOTIATING state to get a
failure, leading to ceph_fault() and ultimately ceph_con_close().
Clear that bits if it is set in that case, to reflect that the
connection truly is closed and is no longer participating in a
connect sequence.

Issue a warning if ceph_con_open() is called on a connection that
is not in CLOSED state.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 net/ceph/messenger.c |   15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

--
1.7.9.5

Patch

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 3239d3d..603d8b5 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -454,11 +454,14 @@  void ceph_con_close(struct ceph_connection *con)
 {
 	dout("con_close %p peer %s\n", con,
 	     ceph_pr_addr(&con->peer_addr.in_addr));
-	set_bit(CLOSED, &con->state);  /* in case there's queued work */
+	clear_bit(NEGOTIATING, &con->state);
 	clear_bit(STANDBY, &con->state);  /* avoid connect_seq bump */
+	set_bit(CLOSED, &con->state);
+
 	clear_bit(LOSSYTX, &con->flags);  /* so we retry next connect */
 	clear_bit(KEEPALIVE_PENDING, &con->flags);
 	clear_bit(WRITE_PENDING, &con->flags);
+
 	mutex_lock(&con->mutex);
 	reset_connection(con);
 	con->peer_global_seq = 0;
@@ -475,7 +478,8 @@  void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
 {
 	dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
 	set_bit(OPENING, &con->state);
-	clear_bit(CLOSED, &con->state);
+	WARN_ON(!test_and_clear_bit(CLOSED, &con->state));
+
 	memcpy(&con->peer_addr, addr, sizeof(*addr));
 	con->delay = 0;      /* reset backoff memory */
 	queue_con(con);
@@ -530,6 +534,8 @@  void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
 	INIT_LIST_HEAD(&con->out_queue);
 	INIT_LIST_HEAD(&con->out_sent);
 	INIT_DELAYED_WORK(&con->work, con_work);
+
+	set_bit(CLOSED, &con->state);
 }
 EXPORT_SYMBOL(ceph_con_init);

@@ -1937,14 +1943,15 @@  more:

 	/* open the socket first? */
 	if (con->sock == NULL) {
+		clear_bit(NEGOTIATING, &con->state);
+		set_bit(CONNECTING, &con->state);
+
 		con_out_kvec_reset(con);
 		prepare_write_banner(con);
 		ret = prepare_write_connect(con);
 		if (ret < 0)
 			goto out;
 		prepare_read_banner(con);
-		set_bit(CONNECTING, &con->state);
-		clear_bit(NEGOTIATING, &con->state);

 		BUG_ON(con->in_msg);
 		con->in_tag = CEPH_MSGR_TAG_READY;