quota: quota.conf backward compatibility fix

In release-3.7 the format of quota.conf is changed.
There is a backward compatibility issues during upgrade
1) There can be an issue when peer sync between node-3.6 and node-3.7
2) If the user sets/removes limit, there is will different format of
   file in node-3.6 and node-3.7

This patch fixes the issue:
1) restrict the user to execute command quota enable, limit-usage, remove
2) write quota.conf in older format if op-version is less than 3.6

Change-Id: Ib76f5a0a85394642159607a105cacda743e7d26b
BUG: 1223739
Signed-off-by: vmallika <vmallika@redhat.com>
Reviewed-on: http://review.gluster.org/10889
Tested-by: NetBSD Build System
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>

2 files changed, 2 insertions, 57 deletions

diff --git a/libglusterfs/src/quota-common-utils.c b/libglusterfs/src/quota-common-utils.c
index 97965b09947..012f80fab48 100644
--- a/libglusterfs/src/quota-common-utils.c
+++ b/libglusterfs/src/quota-common-utils.c
@@ -177,57 +177,6 @@ out:
 }
 
 int32_t
-quota_conf_write_header (int fd)
-{
-        int    header_len    = 0;
-        int    ret           = 0;
-
-        header_len = strlen (QUOTA_CONF_HEADER);
-
-        ret = gf_nwrite (fd, QUOTA_CONF_HEADER, header_len);
-        if (ret != header_len) {
-                ret = -1;
-                goto out;
-        }
-
-        ret = 0;
-
-out:
-        if (ret < 0)
-                gf_log_callingfn ("quota", GF_LOG_ERROR, "failed to write "
-                                  "header to a quota conf");
-
-        return ret;
-}
-
-int32_t
-quota_conf_write_gfid (int fd, void *buf, char type)
-{
-        int ret        = 0;
-
-        ret = gf_nwrite (fd, buf, 16);
-        if (ret != 16) {
-                ret = -1;
-                goto out;
-        }
-
-        ret = gf_nwrite (fd, &type, 1);
-        if (ret != 1) {
-                ret = -1;
-                goto out;
-        }
-
-        ret = 0;
-
-out:
-        if (ret < 0)
-                gf_log_callingfn ("quota", GF_LOG_ERROR, "failed to write "
-                                  "gfid %s to a quota conf", uuid_utoa (buf));
-
-        return ret;
-}
-
-int32_t
 quota_conf_read_gfid (int fd, void *buf, char *type, float version)
 {
         int           ret         = 0;
diff --git a/libglusterfs/src/quota-common-utils.h b/libglusterfs/src/quota-common-utils.h
index e80c74cba72..2c3632b903c 100644
--- a/libglusterfs/src/quota-common-utils.h
+++ b/libglusterfs/src/quota-common-utils.h
@@ -16,6 +16,8 @@
 #define GF_QUOTA_CONF_VERSION 1.2
 #define QUOTA_CONF_HEADER                           \
         "GlusterFS Quota conf | version: v1.2\n"
+#define QUOTA_CONF_HEADER_1_1                       \
+        "GlusterFS Quota conf | version: v1.1\n"
 
 typedef enum {
         GF_QUOTA_CONF_TYPE_USAGE = 1,
@@ -52,12 +54,6 @@ int32_t
 quota_conf_read_version (int fd, float *version);
 
 int32_t
-quota_conf_write_header (int fd);
-
-int32_t
-quota_conf_write_gfid (int fd, void *buf, char type);
-
-int32_t
 quota_conf_read_gfid (int fd, void *buf, char *type, float version);
 
 int32_t