[dm-devel] [PATCH] multipath: and wwids_file multipath.conf option

[Benjamin Marzinski]

This patch adds a wwids_file multipath.conf option, so that users can
move the wwids file from its default location at /etc/multipath/wwids.
It also corrects the default bindings file location in the multipath.conf
manpage and makes the bindings_file value always print out when you 
display the configuration, like is done with the other default values.

Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
---
 libmultipath/config.c      |    6 +++++-
 libmultipath/config.h      |    1 +
 libmultipath/dict.c        |   24 ++++++++++++++++++++----
 libmultipath/wwids.c       |    3 ++-
 multipath/multipath.conf.5 |    8 +++++++-
 5 files changed, 35 insertions(+), 7 deletions(-)

Index: multipath-tools-120817/libmultipath/config.c
===================================================================
--- multipath-tools-120817.orig/libmultipath/config.c
+++ multipath-tools-120817/libmultipath/config.c
@@ -455,6 +455,8 @@ free_config (struct config * conf)
 	if (conf->bindings_file)
 		FREE(conf->bindings_file);
 
+	if (conf->wwids_file)
+		FREE(conf->wwids_file);
 	if (conf->prio_name)
 		FREE(conf->prio_name);
 
@@ -505,6 +507,7 @@ load_config (char * file)
 	conf->minio_rq = DEFAULT_MINIO_RQ;
 	get_sys_max_fds(&conf->max_fds);
 	conf->bindings_file = set_default(DEFAULT_BINDINGS_FILE);
+	conf->wwids_file = set_default(DEFAULT_WWIDS_FILE);
 	conf->bindings_read_only = 0;
 	conf->multipath_dir = set_default(DEFAULT_MULTIPATHDIR);
 	conf->features = set_default(DEFAULT_FEATURES);
@@ -603,7 +606,8 @@ load_config (char * file)
 	if (conf->bindings_file == NULL)
 		conf->bindings_file = set_default(DEFAULT_BINDINGS_FILE);
 
-	if (!conf->multipath_dir || !conf->bindings_file)
+	if (!conf->multipath_dir || !conf->bindings_file ||
+	    !conf->wwids_file)
 		goto out;
 
 	return 0;
Index: multipath-tools-120817/libmultipath/config.h
===================================================================
--- multipath-tools-120817.orig/libmultipath/config.h
+++ multipath-tools-120817/libmultipath/config.h
@@ -117,6 +117,7 @@ struct config {
 	char * features;
 	char * hwhandler;
 	char * bindings_file;
+	char * wwids_file;
 	char * prio_name;
 	char * prio_args;
 	char * checker_name;
Index: multipath-tools-120817/libmultipath/dict.c
===================================================================
--- multipath-tools-120817.orig/libmultipath/dict.c
+++ multipath-tools-120817/libmultipath/dict.c
@@ -618,6 +618,17 @@ bindings_file_handler(vector strvec)
 	return 0;
 }
 
+static int
+wwids_file_handler(vector strvec)
+{
+	conf->wwids_file = set_value(strvec);
+
+	if (!conf->wwids_file)
+		return 1;
+
+	return 0;
+}
+
 /*
  * blacklist block handlers
  */
@@ -2570,14 +2581,18 @@ snprint_def_bindings_file (char * buff,
 {
 	if (conf->bindings_file == NULL)
 		return 0;
-	if (strlen(conf->bindings_file) == strlen(DEFAULT_BINDINGS_FILE) &&
-	    !strcmp(conf->bindings_file, DEFAULT_BINDINGS_FILE))
-		return 0;
-
 	return snprintf(buff, len, "%s", conf->bindings_file);
 }
 
 static int
+snprint_def_wwids_file (char * buff, int len, void * data)
+{
+	if (conf->wwids_file == NULL)
+		return 0;
+	return snprintf(buff, len, "%s", conf->wwids_file);
+}
+
+static int
 snprint_def_reservation_key(char * buff, int len, void * data)
 {
 	return snprintf(buff, len, "%s", conf->reservation_key);
@@ -2644,6 +2659,7 @@ init_keywords(void)
 	install_keyword("fast_io_fail_tmo", &def_fast_io_fail_handler, &snprint_def_fast_io_fail);
 	install_keyword("dev_loss_tmo", &def_dev_loss_handler, &snprint_def_dev_loss);
 	install_keyword("bindings_file", &bindings_file_handler, &snprint_def_bindings_file);
+	install_keyword("wwids_file", &wwids_file_handler, &snprint_def_wwids_file);
 	install_keyword("log_checker_err", &def_log_checker_err_handler, &snprint_def_log_checker_err);
 	install_keyword("reservation_key", &def_reservation_key_handler, &snprint_def_reservation_key);
 	__deprecated install_keyword("default_selector", &def_selector_handler, NULL);
Index: multipath-tools-120817/libmultipath/wwids.c
===================================================================
--- multipath-tools-120817.orig/libmultipath/wwids.c
+++ multipath-tools-120817/libmultipath/wwids.c
@@ -13,6 +13,7 @@
 #include "file.h"
 #include "wwids.h"
 #include "defaults.h"
+#include "config.h"
 
 /*
  * Copyright (c) 2010 Benjamin Marzinski, Redhat
@@ -85,7 +86,7 @@ check_wwids_file(char *wwid, int write_w
 {
 	int fd, can_write, found, ret;
 	FILE *f;
-	fd = open_file(DEFAULT_WWIDS_FILE, &can_write, WWIDS_FILE_HEADER);
+	fd = open_file(conf->wwids_file, &can_write, WWIDS_FILE_HEADER);
 	if (fd < 0)
 		return -1;
 
Index: multipath-tools-120817/multipath/multipath.conf.5
===================================================================
--- multipath-tools-120817.orig/multipath/multipath.conf.5
+++ multipath-tools-120817/multipath/multipath.conf.5
@@ -353,7 +353,13 @@ cannot be told to stop queueing IO. Sett
 .TP
 .B bindings_file
 The full pathname of the binding file to be used when the user_friendly_names option is set. Defaults to
-.I /var/lib/multipath/bindings
+.I /etc/multipath/bindings
+.TP
+.B wwids_file
+The full pathname of the wwids file, which is used by multipath to keep track
+of the wwids for LUNs it has created multipath devices on in the past.
+Defaults to
+.I /etc/multipath/wwids
 .TP
 .B log_checker_err
 If set to