From 39c93f3da3e506cf2f9f852ec0b92a55c9ecd764 Mon Sep 17 00:00:00 2001
From: asomers <asomers@FreeBSD.org>
Date: Mon, 2 Oct 2017 22:39:12 +0000
Subject: [PATCH] MFV r319743:  	8108 zdb -l fails to read labels 2 and 3

illumos/illumos-gate@22c8b9583d07895c16549075a53668d7bc988cf3
https://github.com/illumos/illumos-gate/commit/22c8b9583d07895c16549075a53668d7bc988cf3

https://www.illumos.org/issues/8108

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Igor Kozhukhov <igor@dilos.org>
Reviewed by: Andrew Stormont <andyjstormont@gmail.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Author: Yuri Pankov <yuri.pankov@nexenta.com>

MFC after:	3 weeks
---
 cddl/contrib/opensolaris/cmd/zdb/zdb.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/cddl/contrib/opensolaris/cmd/zdb/zdb.c b/cddl/contrib/opensolaris/cmd/zdb/zdb.c
index 5176efac8a5b..454d2bccae3e 100644
--- a/cddl/contrib/opensolaris/cmd/zdb/zdb.c
+++ b/cddl/contrib/opensolaris/cmd/zdb/zdb.c
@@ -2186,24 +2186,29 @@ dump_label(const char *dev)
 
 		(void) snprintf(path, sizeof (path), "%s%s", ZFS_RDISK_ROOTD,
 		    dev);
-		if ((s = strrchr(dev, 's')) == NULL || !isdigit(*(s + 1)))
+		if (((s = strrchr(dev, 's')) == NULL &&
+		    (s = strchr(dev, 'p')) == NULL) ||
+		    !isdigit(*(s + 1)))
 			(void) strlcat(path, "s0", sizeof (path));
 	}
 
-	if (stat64(path, &statbuf) != 0) {
-		(void) printf("failed to stat '%s': %s\n", path,
+	if ((fd = open64(path, O_RDONLY)) < 0) {
+		(void) fprintf(stderr, "cannot open '%s': %s\n", path,
 		    strerror(errno));
 		exit(1);
 	}
 
-	if (S_ISBLK(statbuf.st_mode)) {
-		(void) printf("cannot use '%s': character device required\n",
-		    path);
+	if (fstat64(fd, &statbuf) != 0) {
+		(void) fprintf(stderr, "failed to stat '%s': %s\n", path,
+		    strerror(errno));
+		(void) close(fd);
 		exit(1);
 	}
 
-	if ((fd = open64(path, O_RDONLY)) < 0) {
-		(void) printf("cannot open '%s': %s\n", path, strerror(errno));
+	if (S_ISBLK(statbuf.st_mode)) {
+		(void) fprintf(stderr,
+		    "cannot use '%s': character device required\n", path);
+		(void) close(fd);
 		exit(1);
 	}