glusterd/quota: upgrade quota.conf file during an upgrade

Problem
=======
When quota is enabled on 3.6, it will have quota conf version in quota.conf
as v1.1. This node gets upgraded to 3.7 but it will still have quota conf
version as v1.1 until a quota enable/disable/set limit is initiated. When
this is not initiated and when this node tries to peer probe a node which
is a fresh install of 3.7 (which will have quota conf version as v1.2), then this
will result in "Peer rejected" state. This patch fixes the issue.

Solution
========
When an upgrade happens from 3.6 to 3.7, quota.conf file needs
to be modified as well. With 3.6, in quota.conf the version will be
v1.1 and it needs to be changed to v1.2 from 3.7. This is because in
3.7, inode quota feature is introduced. So when an op-version bumpup
happens quota.conf needs to be upgraded with quota conf version v1.2
and all the 16 byte uuid needs to be changed to 17 bytes uuid as well.

Previously, when the cluster version is upgraded to 3.7, the quota.conf
got upgraded as well. But, the upgradation was done only when quota
enable/disable/set limit is done. With this patch, the upgradation is done
during a cluster op version bump up as well.

> Reviewed-on: http://review.gluster.org/15352
> Tested-by: Atin Mukherjee <amukherj@redhat.com>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
(cherry picked from commit 4b2cff614462508eef529c5d128e0974720e3f50)

Change-Id: Idb5ba29d3e1ea0e45c85d87c952c75da9e0f99f0
BUG: 1392716
Signed-off-by: Manikandan Selvaganesh <mselvaga@redhat.com>
Reviewed-on: http://review.gluster.org/15791
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Manikandan Selvaganesh <manikandancs333@gmail.com>
Tested-by: Manikandan Selvaganesh <manikandancs333@gmail.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>

4 files changed, 60 insertions, 16 deletions

diff --git a/xlators/mgmt/glusterd/src/Makefile.am b/xlators/mgmt/glusterd/src/Makefile.am
index f3381e34930..f938aaf9436 100644
--- a/xlators/mgmt/glusterd/src/Makefile.am
+++ b/xlators/mgmt/glusterd/src/Makefile.am
@@ -30,7 +30,7 @@ endif
 noinst_HEADERS = glusterd.h glusterd-utils.h glusterd-op-sm.h \
 	glusterd-sm.h glusterd-store.h glusterd-mem-types.h \
 	glusterd-pmap.h glusterd-volgen.h glusterd-mountbroker.h \
-	glusterd-syncop.h glusterd-hooks.h glusterd-locks.h \
+	glusterd-syncop.h glusterd-hooks.h glusterd-locks.h glusterd-quota.h \
 	glusterd-mgmt.h glusterd-messages.h glusterd-peer-utils.h \
 	glusterd-statedump.h glusterd-snapshot-utils.h glusterd-geo-rep.h \
 	glusterd-conn-mgmt.h glusterd-conn-helper.h glusterd-proc-mgmt.h \
diff --git a/xlators/mgmt/glusterd/src/glusterd-op-sm.c b/xlators/mgmt/glusterd/src/glusterd-op-sm.c
index 0ff8ebcbe7b..9c26cb50e9b 100644
--- a/xlators/mgmt/glusterd/src/glusterd-op-sm.c
+++ b/xlators/mgmt/glusterd/src/glusterd-op-sm.c
@@ -36,6 +36,7 @@
 #include "glusterd-locks.h"
 #include "glusterd-messages.h"
 #include "glusterd-utils.h"
+#include "glusterd-quota.h"
 #include "syscall.h"
 #include "cli1-xdr.h"
 #include "common-utils.h"
@@ -2247,17 +2248,19 @@ static int
 glusterd_op_set_all_volume_options (xlator_t *this, dict_t *dict,
                                     char **op_errstr)
 {
-        char            *key            = NULL;
-        char            *key_fixed      = NULL;
-        char            *value          = NULL;
-        char            *dup_value      = NULL;
-        int             ret             = -1;
-        glusterd_conf_t *conf           = NULL;
-        dict_t          *dup_opt        = NULL;
-        char            *next_version   = NULL;
-        gf_boolean_t    quorum_action   = _gf_false;
-        uint32_t        op_version      = 0;
-        glusterd_volinfo_t  *volinfo    = NULL;
+        char            *key                    = NULL;
+        char            *key_fixed              = NULL;
+        char            *value                  = NULL;
+        char            *dup_value              = NULL;
+        int             ret                     = -1;
+        glusterd_conf_t *conf                   = NULL;
+        dict_t          *dup_opt                = NULL;
+        char            *next_version           = NULL;
+        gf_boolean_t    quorum_action           = _gf_false;
+        uint32_t        op_version              = 0;
+        glusterd_volinfo_t  *volinfo            = NULL;
+        glusterd_volinfo_t  *tmp_volinfo        = NULL;
+        glusterd_volinfo_t  *voliter            = NULL;
 
         conf = this->private;
         ret = dict_get_str (dict, "key1", &key);
@@ -2303,6 +2306,25 @@ glusterd_op_set_all_volume_options (xlator_t *this, dict_t *dict,
 
                 if (op_version >= conf->op_version) {
                         conf->op_version = op_version;
+
+                        /* When a bump up happens, update the quota.conf file
+                         * as well. This is because, till 3.7 we had a quota
+                         * conf version v1.1 in quota.conf. When inode-quota
+                         * feature is introduced, this needs to be changed to
+                         * v1.2 in quota.conf and 16 bytes uuid in quota.conf
+                         * needs to be changed to 17 bytes. Look
+                         * glusterd_store_quota_config for more details.
+                         */
+                        cds_list_for_each_entry (voliter, &conf->volumes, vol_list) {
+                                tmp_volinfo = voliter;
+                                ret = glusterd_store_quota_config (tmp_volinfo,
+                                                                   NULL, NULL,
+                                                                   GF_QUOTA_OPTION_TYPE_UPGRADE,
+                                                                   NULL);
+                                if (ret)
+                                        goto out;
+                        }
+
                         ret = glusterd_store_global_info (this);
                         if (ret) {
                                 gf_msg (this->name, GF_LOG_ERROR, 0,
diff --git a/xlators/mgmt/glusterd/src/glusterd-quota.c b/xlators/mgmt/glusterd/src/glusterd-quota.c
index 55699cc57a9..08fc74f396b 100644
--- a/xlators/mgmt/glusterd/src/glusterd-quota.c
+++ b/xlators/mgmt/glusterd/src/glusterd-quota.c
@@ -23,6 +23,7 @@
 #include "byte-order.h"
 #include "compat-errno.h"
 #include "quota-common-utils.h"
+#include "glusterd-quota.h"
 
 #include <sys/wait.h>
 #include <dlfcn.h>
@@ -55,12 +56,10 @@ const char *gd_quota_op_list[GF_QUOTA_OPTION_TYPE_MAX + 1] = {
         [GF_QUOTA_OPTION_TYPE_LIST_OBJECTS]       = "list-objects",
         [GF_QUOTA_OPTION_TYPE_REMOVE_OBJECTS]     = "remove-objects",
         [GF_QUOTA_OPTION_TYPE_ENABLE_OBJECTS]     = "enable-objects",
+        [GF_QUOTA_OPTION_TYPE_UPGRADE]            = "upgrade",
         [GF_QUOTA_OPTION_TYPE_MAX]                = NULL
 };
 
-int
-glusterd_store_quota_config (glusterd_volinfo_t *volinfo, char *path,
-                             char *gfid_str, int opcode, char **op_errstr);
 
 gf_boolean_t
 glusterd_is_quota_supported (int32_t type, char **op_errstr)
@@ -1097,9 +1096,15 @@ glusterd_store_quota_config (glusterd_volinfo_t *volinfo, char *path,
         if (ret)
                 goto out;
 
+
         /* Just create empty quota.conf file if create */
         if (GF_QUOTA_OPTION_TYPE_ENABLE == opcode ||
-            GF_QUOTA_OPTION_TYPE_ENABLE_OBJECTS == opcode) {
+            GF_QUOTA_OPTION_TYPE_ENABLE_OBJECTS == opcode ||
+            GF_QUOTA_OPTION_TYPE_UPGRADE == opcode) {
+                /* Opcode will be GF_QUOTA_OPTION_TYPE_UPGRADE when there is
+                 * an upgrade from 3.6 to 3.7. Just upgrade the quota.conf
+                 * file even during an op-version bumpup and exit.
+                 */
                 modified = _gf_true;
                 goto out;
         }
diff --git a/xlators/mgmt/glusterd/src/glusterd-quota.h b/xlators/mgmt/glusterd/src/glusterd-quota.h
new file mode 100644
index 00000000000..9efff41b436
--- /dev/null
+++ b/xlators/mgmt/glusterd/src/glusterd-quota.h
@@ -0,0 +1,17 @@
+/*
+   Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+#ifndef _GLUSTERD_QUOTA_
+#define _GLUSTERD_QUOTA_
+
+int
+glusterd_store_quota_config (glusterd_volinfo_t *volinfo, char *path,
+                             char *gfid_str, int opcode, char **op_errstr);
+
+#endif