From 0f54b3120ca06ff3168cdbf901a27b68c4638398 Mon Sep 17 00:00:00 2001
From: Changqing Li <changqing.li@windriver.com>
Date: Thu, 26 Sep 2019 16:29:48 +0800
Subject: [PATCH] From 0000000000000000000000000000000000000000 Mon Sep
17
 00:00:00 2001 From: Benjamin Marzinski <bmarzins@redhat.com> Date: Fri,
17
 Oct 2014 11:20:34 -0500 Subject: [PATCH] RH: add wwids from kernel
cmdline
 mpath.wwids with -A

This patch adds another option to multipath, "-A", which reads
/proc/cmdline for mpath.wwid=<WWID> options, and adds any wwids it finds
to /etc/multipath/wwids.  While this isn't usually important during
normal operation, since these wwids should already be added, it can be
helpful during installation, to make sure that multipath can claim
devices as its own, before LVM or something else makes use of them.  The
patch also execs "/sbin/multipath -A" before running multipathd in
multipathd.service

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>

Upstream-Status: Pending

Update this patch to new version 0.8.2

Signed-off-by: Changqing Li <changqing.li@windriver.com>
---
 libmultipath/wwids.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 libmultipath/wwids.h |  1 +
 2 files changed, 45 insertions(+)

diff --git a/libmultipath/wwids.c b/libmultipath/wwids.c
index 28a2150d..a0bfa851 100644
--- a/libmultipath/wwids.c
+++ b/libmultipath/wwids.c
@@ -454,3 +454,47 @@ int op ## _wwid(const char *wwid) \
 declare_failed_wwid_op(is_failed, false)
 declare_failed_wwid_op(mark_failed, true)
 declare_failed_wwid_op(unmark_failed, true)
+
+int remember_cmdline_wwid(void)
+{
+       FILE *f = NULL;
+       char buf[LINE_MAX], *next, *ptr;
+       int ret = 0;
+
+       f = fopen("/proc/cmdline", "re");
+       if (!f) {
+               condlog(0, "can't open /proc/cmdline : %s", strerror(errno));
+               return -1;
+       }
+
+       if (!fgets(buf, sizeof(buf), f)) {
+               if (ferror(f))
+                       condlog(0, "read of /proc/cmdline failed : %s",
+                               strerror(errno));
+               else
+                       condlog(0, "couldn't read /proc/cmdline");
+               fclose(f);
+               return -1;
+       }
+       fclose(f);
+       next = buf;
+       while((ptr = strstr(next, "mpath.wwid="))) {
+               ptr += 11;
+               next = strpbrk(ptr, " \t\n");
+               if (next) {
+                       *next = '\0';
+                       next++;
+               }
+               if (strlen(ptr)) {
+                       if (remember_wwid(ptr) != 0)
+                               ret = -1;
+               }
+               else {
+                       condlog(0, "empty mpath.wwid kernel command line option");
+                       ret = -1;
+               }
+               if (!next)
+                       break;
+       }
+       return ret;
+}
diff --git a/libmultipath/wwids.h b/libmultipath/wwids.h
index 0c6ee54d..e32a0b0e 100644
--- a/libmultipath/wwids.h
+++ b/libmultipath/wwids.h
@@ -17,6 +17,7 @@ int remember_wwid(char *wwid);
 int check_wwids_file(char *wwid, int write_wwid);
 int remove_wwid(char *wwid);
 int replace_wwids(vector mp);
+int remember_cmdline_wwid(void);
 
 enum {
 	WWID_IS_NOT_FAILED = 0,
-- 
2.17.1