cluster: RHEL59 - Fix bug in cmirror that caused incorrect status info to print on some nodes.

[Jonathan Brassow]

Gitweb:       
http://git.fedorahosted.org/git/cluster.git?p=cluster.git;a=commitdiff;h=...
Commit:        bdf7691f84eac400323c84a490f0147ec851afdf
Parent:        c6fca5e49ad1c8a6e1bce1874d0688aab3ccac26
Author:        Jonathan Brassow <jbrassow(a)redhat.com&gt;
AuthorDate:    Thu Apr 26 12:39:47 2012 -0500
Committer:     Jonathan Brassow <jbrassow(a)redhat.com&gt;
CommitterDate: Thu Apr 26 12:39:47 2012 -0500

Fix bug in cmirror that caused incorrect status info to print on some nodes.

Here's the upstream commit message:

commit 172a9457bf8dcc1e5c3a607be2e8d1ac80ac619b
Author: Jonathan Earl Brassow <jbrassow(a)redhat.com&gt;
Date:   Thu Apr 26 17:30:49 2012 +0000

    Fix bug in cmirror that caused incorrect status info to print on some nodes.

    Looking at the code in cmirrord/local.c, we can see the various different
    request types handled in different ways.  Some information that is non-changin
    does not need to go around the cluster and can be short-circuited.  For
    example, once the cluster mirror is in-sync, it is pointless to continue
    sending that query around the cluster.  We can save network bandwidth and repl
    directly back to the kernel.  When it comes to status information, there are
    two types 'TABLE' and 'INFO'.  The 'TABLE' information never
changes and
    belongs to the group of requests that can be safely short-circuited.  The
    'STATUS' information can change - and will change if a device fails.  Thus it
    cannot be short-circuited, but this is exactly what was found.  The 'STATUS'
    information request was being short-circuited and therefore never reporting th
    failure condition to anyone other than the "server" that experienced it
    directly.
---
 cmirror/src/local.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/cmirror/src/local.c b/cmirror/src/local.c
index 3e6d74a..29184a0 100644
--- a/cmirror/src/local.c
+++ b/cmirror/src/local.c
@@ -209,7 +209,6 @@ static int do_local_work(void *data)
 	case DM_CLOG_DTR:
 	case DM_CLOG_IN_SYNC:
 	case DM_CLOG_GET_SYNC_COUNT:
-	case DM_CLOG_STATUS_INFO:
 	case DM_CLOG_STATUS_TABLE:
 	case DM_CLOG_PRESUSPEND:
 		/* We do not specify ourselves as server here */
@@ -245,6 +244,7 @@ static int do_local_work(void *data)
 	case DM_CLOG_MARK_REGION:
 	case DM_CLOG_GET_RESYNC_WORK:
 	case DM_CLOG_SET_REGION_SYNC:
+	case DM_CLOG_STATUS_INFO:
 	case DM_CLOG_IS_REMOTE_RECOVERING:
 	case DM_CLOG_POSTSUSPEND:
 		r = cluster_send(tfr);