glusterfsd: dump the in-memory graph rather than volfile

Currently we have been printing in the logfile, the volfile
verbatim as received from the server. However we perform
pre-processing on the graph we receive from the server, like
adding ACL translator, applying --xlator-option cli params,
etc.

So print the serialized in-memory graph as the "volfile" in
the log. This can be very handy to double check if certain
--xlator-option param actually got applied or not, and in
general is showing a "truer" representation of the real graph
actually used.

Change-Id: I0221dc56e21111b48a1ee3e5fe17a5ef820dc0c6
BUG: 924504
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.org/4708
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@redhat.com>

glusterfsd/src/glusterfsd.c

@@ -1765,7 +1765,7 @@ glusterfs_process_volfp (glusterfs_ctx_t *ctx, FILE *fp)
                 goto out;
         }
 
-        gf_log_volume_file (fp);
+        gf_log_dump_graph (fp, graph);
 
         ret = 0;
 out:

libglusterfs/src/common-utils.c

@@ -268,30 +268,101 @@ err:
 }
 
 
-void
-gf_log_volume_file (FILE *specfp)
+struct xldump {
+	int lineno;
+	FILE *logfp;
+};
+
+
+static int
+nprintf (struct xldump *dump, const char *fmt, ...)
+{
+	va_list ap;
+	int ret = 0;
+
+
+	ret += fprintf (dump->logfp, "%3d: ", ++dump->lineno);
+
+	va_start (ap, fmt);
+	ret += vfprintf (dump->logfp, fmt, ap);
+	va_end (ap);
+
+	ret += fprintf (dump->logfp, "\n");
+
+	return ret;
+}
+
+
+static int
+xldump_options (dict_t *this, char *key, data_t *value,	void *d)
+{
+	nprintf (d, "    option %s %s", key, value->data);
+	return 0;
+}
+
+
+static void
+xldump_subvolumes (xlator_t *this, void *d)
+{
+	xlator_list_t *subv = NULL;
+	int len = 0;
+	char *subvstr = NULL;
+
+	subv = this->children;
+	if (!this->children)
+		return;
+
+	for (subv = this->children; subv; subv = subv->next)
+		len += (strlen (subv->xlator->name) + 1);
+
+	subvstr = GF_CALLOC (1, len, gf_common_mt_strdup);
+
+	len = 0;
+	for (subv = this->children; subv; subv= subv->next)
+		len += sprintf (subvstr + len, "%s%s", subv->xlator->name,
+				subv->next ? " " : "");
+
+	nprintf (d, "    subvolumes %s", subvstr);
+
+	GF_FREE (subvstr);
+}
+
+
+static void
+xldump (xlator_t *each, void *d)
+{
+	nprintf (d, "volume %s", each->name);
+	nprintf (d, "    type %s", each->type);
+	dict_foreach (each->options, xldump_options, d);
+
+	xldump_subvolumes (each, d);
+
+	nprintf (d, "end-volume");
+	nprintf (d, "");
+}
+
+
+void
+gf_log_dump_graph (FILE *specfp, glusterfs_graph_t *graph)
 {
-        int          lcount = 0;
-        char         data[GF_UNIT_KB];
         glusterfs_ctx_t *ctx;
+	struct xldump xld = {0, };
+
 
         ctx = THIS->ctx;
+	xld.logfp = ctx->log.gf_log_logfile;
 
-        fseek (specfp, 0L, SEEK_SET);
-
-        fprintf (ctx->log.gf_log_logfile, "Given volfile:\n");
+        fprintf (ctx->log.gf_log_logfile, "Final graph:\n");
         fprintf (ctx->log.gf_log_logfile,
                  "+---------------------------------------"
                  "---------------------------------------+\n");
-        while (fgets (data, GF_UNIT_KB, specfp) != NULL){
-                lcount++;
-                fprintf (ctx->log.gf_log_logfile, "%3d: %s", lcount, data);
-        }
+
+	xlator_foreach_depth_first (graph->top, xldump, &xld);
+
         fprintf (ctx->log.gf_log_logfile,
-                 "\n+---------------------------------------"
+                 "+---------------------------------------"
                  "---------------------------------------+\n");
         fflush (ctx->log.gf_log_logfile);
-        fseek (specfp, 0L, SEEK_SET);
 }
 
 static void

libglusterfs/src/common-utils.h

@@ -107,7 +107,7 @@ void gf_global_variable_init(void);
 
 in_addr_t gf_resolve_ip (const char *hostname, void **dnscache);
 
-void gf_log_volume_file (FILE *specfp);
+void gf_log_dump_graph (FILE *specfp, glusterfs_graph_t *graph);
 void gf_print_trace (int32_t signal, glusterfs_ctx_t *ctx);
 
 #define VECTORSIZE(count) (count * (sizeof (struct iovec)))

libglusterfs/src/xlator.c

@@ -322,6 +322,24 @@ out:
 }
 
 
+void
+xlator_foreach_depth_first (xlator_t *this,
+			    void (*fn)(xlator_t *each, void *data),
+			    void *data)
+{
+	xlator_list_t *subv = NULL;
+
+	subv = this->children;
+
+	while (subv) {
+		xlator_foreach_depth_first (subv->xlator, fn, data);
+		subv = subv->next;
+	}
+
+	fn (this, data);
+}
+
+
 xlator_t *
 xlator_search_by_name (xlator_t *any, const char *name)
 {

libglusterfs/src/xlator.h

@@ -864,6 +864,11 @@ void xlator_foreach (xlator_t *this,
                                  void *data),
                      void *data);
 
+void xlator_foreach_depth_first (xlator_t *this,
+				 void (*fn) (xlator_t *each,
+					     void *data),
+				 void *data);
+
 xlator_t *xlator_search_by_name (xlator_t *any, const char *name);
 xlator_t *xlator_search_by_xl_type (xlator_t *any, const char *type);