From e6ed042c280b0e40185490a9a69cccbcdf75bbf4 Mon Sep 17 00:00:00 2001
From: Benjamin Marzinski <bmarzins@redhat.com>
Date: Wed, 2 Jul 2014 12:49:53 -0500
Subject: [PATCH] RH: Remove the property blacklist exception builtin

Multipath set the default property blacklist exceptions to
(ID_SCSI_VPD|ID_WWN).  This has the effect of blacklisting some internal
devices.  These devices may never have multiple paths, but it is nice
to be able to set multipath up on them all the same.  This patch simply
removes the default, and makes it so that if no property
blacklist_exception is given, then devices aren't failed for not matching
it.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
---
 libmultipath/blacklist.c   | 12 ++++--------
 multipath/multipath.conf.5 | 12 ++++++------
 2 files changed, 10 insertions(+), 14 deletions(-)

diff --git a/libmultipath/blacklist.c b/libmultipath/blacklist.c
index 00e8dbd..a8e0311 100644
--- a/libmultipath/blacklist.c
+++ b/libmultipath/blacklist.c
@@ -204,12 +204,6 @@ setup_default_blist (struct config * conf)
 	if (store_ble(conf->blist_devnode, str, ORIGIN_DEFAULT))
 		return 1;
 
-	str = STRDUP("(SCSI_IDENT_|ID_WWN)");
-	if (!str)
-		return 1;
-	if (store_ble(conf->elist_property, str, ORIGIN_DEFAULT))
-		return 1;
-
 	vector_foreach_slot (conf->hwtable, hwe, i) {
 		if (hwe->bl_product) {
 			if (find_blacklist_device(conf->blist_device,
@@ -395,7 +389,8 @@ filter_property(struct config *conf, struct udev_device *udev, int lvl,
 	if (udev) {
 		/*
 		 * This is the inverse of the 'normal' matching;
-		 * the environment variable _has_ to match.
+		 * the environment variable _has_ to match
+		 * if a whitelist is present.
 		 * But only if the uid_attribute used for determining the WWID
 		 * of the path is is present in the environment
 		 * (uid_attr_seen). If this is not the case, udev probably
@@ -411,7 +406,8 @@ filter_property(struct config *conf, struct udev_device *udev, int lvl,
 			*uid_attribute != '\0';
 		bool uid_attr_seen = false;
 
-		r = MATCH_PROPERTY_BLIST_MISSING;
+		if (VECTOR_SIZE(conf->elist_property))
+			r = MATCH_PROPERTY_BLIST_MISSING;
 		udev_list_entry_foreach(list_entry,
 				udev_device_get_properties_list_entry(udev)) {
 
diff --git a/multipath/multipath.conf.5 b/multipath/multipath.conf.5
index 05a5e8f..2f2d8cc 100644
--- a/multipath/multipath.conf.5
+++ b/multipath/multipath.conf.5
@@ -1286,7 +1286,8 @@ keywords. Both are regular expressions. For a full description of these keywords
 Regular expression for an udev property. All
 devices that have matching udev properties will be excluded/included.
 The handling of the \fIproperty\fR keyword is special,
-because devices \fBmust\fR have at least one whitelisted udev property;
+because if a property blacklist_exception is set, devices \fBmust\fR have at
+least one whitelisted udev property;
 otherwise they're treated as blacklisted, and the message
 "\fIblacklisted, udev property missing\fR" is displayed in the logs.
 .
@@ -1299,11 +1300,10 @@ Blacklisting by missing properties is only applied to devices which do have the
 property specified by \fIuid_attribute\fR (e.g. \fIID_SERIAL\fR)
 set. Previously, it was applied to every device, possibly causing devices to be
 blacklisted because of temporary I/O error conditions.
-.PP
-The default \fIblacklist exception\fR is: \fB(SCSI_IDENT_|ID_WWN)\fR, causing
-well-behaved SCSI devices and devices that provide a WWN (World Wide Number)
-to be included, and all others to be excluded.
-.RE
+For example, setting the property blacklist_exception to
+\fB(SCSI_IDENT_|ID_WWN)\fR, will cause well-behaved SCSI devices and devices
+that provide a WWN (World Wide Number) to be included, and all others to be
+excluded. This works to exclude most non-multipathable devices.
 .TP
 .B protocol
 Regular expression for the protocol of a device to be excluded/included.
-- 
1.8.3.1