[PATCH opensm] Parse the the partition config in dry-run mode first

[Bernd Schubert <bernd.schubert-97jfqw80gc6171pxa8y+qA@public.gmane.org>]

Hello Hal,

thanks for updating the patch! I had it on my todo list during my vacation 
(still one week left) and didn't have the time to care about it before.

What do you think about the patch below on top of your updated patch?
(So far I only tested if it compiles at all.)


From: Bernd Schubert <bernd.schubert-97jfqw80gc6171pxa8y+qA@public.gmane.org>

When the partition config file is parsed, partitions are created
for each line. If one of the config lines has an error a default
partition is created already by a previous commit, but partitions
from previous lines are not cleaned up. 
Avoid this by doing a dry-run parse first and only if this succeeds 
actually create new partitions. 
This still ignores errors from osm_prtn_make_new(), but these
errors are rather unlikely (i.e. malloc fails) and not really
related to the config file.

Signed-off-by: Bernd Schubert <bernd.schubert-97jfqw80gc6171pxa8y+qA@public.gmane.org>
---
 opensm/osm_prtn_config.c |   47 ++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 41 insertions(+), 6 deletions(-)

diff --git a/opensm/osm_prtn_config.c b/opensm/osm_prtn_config.c
index 9bad7a7..4a2eaab 100644
--- a/opensm/osm_prtn_config.c
+++ b/opensm/osm_prtn_config.c
@@ -212,7 +212,8 @@ static void __create_mgrp(struct part_conf *conf, struct precreate_mgroup *group
 }
 
 static int partition_create(unsigned lineno, struct part_conf *conf,
-			    char *name, char *id, char *flag, char *flag_val)
+			    char *name, char *id, char *flag, char *flag_val,
+			    boolean_t is_dry_run)
 {
 	ib_net16_t pkey;
 
@@ -230,6 +231,9 @@ static int partition_create(unsigned lineno, struct part_conf *conf,
 	} else
 		pkey = 0;
 
+	if (is_dry_run)
+		return 0;
+
 	conf->p_prtn = osm_prtn_make_new(conf->p_log, conf->p_subn,
 					 name, pkey);
 	if (!conf->p_prtn)
@@ -601,7 +605,11 @@ static int flush_part_conf(struct part_conf *conf)
 	return 0;
 }
 
-static int parse_part_conf(struct part_conf *conf, char *str, int lineno)
+/**
+ *@is_dry_run only test if this line is valid
+ */
+static int parse_part_conf(struct part_conf *conf, char *str, int lineno,
+			   boolean_t is_dry_run)
 {
 	int ret, len = 0;
 	char *name, *id, *flag, *flval;
@@ -659,7 +667,8 @@ static int parse_part_conf(struct part_conf *conf, char *str, int lineno)
 	}
 
 	if (p != str || (partition_create(lineno, conf,
-					  name, id, flag, flval) < 0)) {
+					  name, id, flag, flval,
+					  is_dry_run) < 0)) {
 		OSM_LOG(conf->p_log, OSM_LOG_ERROR, "PARSE ERROR: line %d: "
 			"bad partition definition\n", lineno);
 		fprintf(stderr, "\nPARSE ERROR: line %d: "
@@ -697,10 +706,12 @@ done:
 }
 
 /**
+ * @is_dry_run test if the config is valid only
  * @return -1 on error, 0 on success
  */
-int osm_prtn_config_parse_file(osm_log_t * p_log, osm_subn_t * p_subn,
-			       const char *file_name)
+static int _osm_prtn_config_parse_file(osm_log_t * p_log, osm_subn_t * p_subn,
+				       const char *file_name,
+				       boolean_t is_dry_run)
 {
 	char line[4096];
 	struct part_conf *conf = NULL;
@@ -757,7 +768,7 @@ int osm_prtn_config_parse_file(osm_log_t * p_log, osm_subn_t * p_subn,
 			if (q)
 				*q = '\0';
 
-			len = parse_part_conf(conf, p, lineno);
+			len = parse_part_conf(conf, p, lineno, is_dry_run);
 			if (len < 0) {
 				is_parse_success = FALSE;
 				break;
@@ -779,3 +790,27 @@ int osm_prtn_config_parse_file(osm_log_t * p_log, osm_subn_t * p_subn,
 	else
 		return -1;
 }
+
+
+/**
+ * @return -1 on error, 0 on success
+ */
+int osm_prtn_config_parse_file(osm_log_t * p_log, osm_subn_t * p_subn,
+			       const char *file_name)
+{
+	boolean_t is_dry_run = TRUE; // dry-run first
+	int parse_res;
+
+	while (1) {
+		parse_res =_osm_prtn_config_parse_file(p_log, p_subn, file_name,
+						       is_dry_run);
+		if (parse_res != 0);
+			return -1;
+
+		if (!is_dry_run)
+			return 0; // parse / partition create success
+
+		is_dry_run = FALSE;
+	}
+
+}

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