From: Martin Wilck <mwi...@suse.com>
If the nvme native multipath driver is enabled, blacklist nvme devices
for dm-multipath by default. This is particularly useful with
"find_multipaths greedy".
Signed-off-by: Martin Wilck <mwi...@suse.com>
---
libmultipath/blacklist.c | 35 ++++++++++++++++++++++++++++++++---
tests/blacklist.c | 30 ++++++++++++++++++++++++++++--
2 files changed, 60 insertions(+), 5 deletions(-)
diff --git a/libmultipath/blacklist.c b/libmultipath/blacklist.c
index 8d15d2e..75100b2 100644
--- a/libmultipath/blacklist.c
+++ b/libmultipath/blacklist.c
@@ -2,6 +2,8 @@
* Copyright (c) 2004, 2005 Christophe Varoqui
*/
#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
#include <libudev.h>
#include "checkers.h"
@@ -191,6 +193,27 @@ find_blacklist_device (const struct _vector *blist, const
char *vendor,
return 0;
}
+/*
+ * Test if nvme native multipath is enabled. If the sysfs file can't
+ * be accessed, multipath is either disabled at compile time, or no
+ * nvme driver is loaded at all. Thus treat errors as "no".
+ */
+static bool nvme_multipath_enabled(void)
+{
+ static const char fn[] = "/sys/module/nvme_core/parameters/multipath";
+ int fd, len;
+ char buf[2];
+
+ fd = open(fn, O_RDONLY);
+ if (fd == -1)
+ return false;
+
+ len = read(fd, buf, sizeof(buf));
+ close(fd);
+
+ return (len >= 1 && buf[0] == 'Y');
+}
+
int
setup_default_blist (struct config * conf)
{
@@ -198,9 +221,15 @@ setup_default_blist (struct config * conf)
struct hwentry *hwe;
int i;
- if (store_ble(conf->blist_devnode, "!^(sd[a-z]|dasd[a-z]|nvme[0-9])",
ORIGIN_DEFAULT))
- return 1;
-
+ if (nvme_multipath_enabled()) {
+ if (store_ble(conf->blist_devnode, "!^(sd[a-z]|dasd[a-z])",
+ ORIGIN_DEFAULT))
+ return 1;
+ } else {
+ if (store_ble(conf->blist_devnode,
"!^(sd[a-z]|dasd[a-z]|nvme[0-9])",
+ ORIGIN_DEFAULT))
+ return 1;
+ }
if (store_ble(conf->elist_property, "(SCSI_IDENT_|ID_WWN)",
ORIGIN_DEFAULT))
return 1;
diff --git a/tests/blacklist.c b/tests/blacklist.c
index 882aa3a..65002eb 100644
--- a/tests/blacklist.c
+++ b/tests/blacklist.c
@@ -17,6 +17,8 @@
*/
#include <stdarg.h>
#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
#include <setjmp.h>
#include <cmocka.h>
#include "globals.c"
@@ -220,12 +222,36 @@ static void test_devnode_missing(void **state)
MATCH_NOTHING);
}
+/* copy of the same function in libmultipath/blacklist.c */
+static bool nvme_multipath_enabled(void)
+{
+ static const char fn[] = "/sys/module/nvme_core/parameters/multipath";
+ int fd, len;
+ char buf[2];
+
+ fd = open(fn, O_RDONLY);
+ if (fd == -1)
+ return false;
+
+ len = read(fd, buf, sizeof(buf));
+ close(fd);
+
+ return (len >= 1 && buf[0] == 'Y');
+}
+
static void test_devnode_default(void **state)
{
assert_int_equal(filter_devnode(blist_devnode_default, NULL, "sdaa"),
MATCH_NOTHING);
- assert_int_equal(filter_devnode(blist_devnode_default, NULL, "nvme0n1"),
- MATCH_NOTHING);
+ if (nvme_multipath_enabled()) {
+ expect_condlog(3, "nvme0n1: device node name blacklisted\n");
+ assert_int_equal(filter_devnode(blist_devnode_default, NULL,
+ "nvme0n1"),
+ MATCH_DEVNODE_BLIST);
+ } else
+ assert_int_equal(filter_devnode(blist_devnode_default, NULL,
+ "nvme0n1"),
+ MATCH_NOTHING);
assert_int_equal(filter_devnode(blist_devnode_default, NULL, "dasda"),
MATCH_NOTHING);
expect_condlog(3, "hda: device node name blacklisted\n");
--
2.41.0
--
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