From a1cbd7d053e034bbfcf337bc9ee7b92ec4c6f6c0 Mon Sep 17 00:00:00 2001
From: Neil Brown <neilb@suse.de>
Date: Fri, 19 May 2006 07:19:04 +0000
Subject: [PATCH] Include homehost information in --examine as appropriate

Signed-off-by: Neil Brown <neilb@suse.de>
---
 Examine.c |  6 ++++--
 mdadm.c   |  2 +-
 mdadm.h   |  4 ++--
 super0.c  | 16 ++++++++++++----
 super1.c  | 11 ++++++++---
 5 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/Examine.c b/Examine.c
index b5a6f13..16b1b9b 100644
--- a/Examine.c
+++ b/Examine.c
@@ -35,7 +35,9 @@
 #endif
 #include	"md_u.h"
 #include	"md_p.h"
-int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust, struct supertype *forcest)
+int Examine(mddev_dev_t devlist, int brief, int scan,
+	    int SparcAdjust, struct supertype *forcest,
+	    char *homehost)
 {
 
 	/* Read the raid superblock from a device and
@@ -124,7 +126,7 @@ int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust, struct su
 			dl_add(ap->devs, d);
 		} else {
 			printf("%s:\n",devlist->devname);
-			st->ss->examine_super(super);
+			st->ss->examine_super(super, homehost);
 			free(super);
 		}
 	}
diff --git a/mdadm.c b/mdadm.c
index de0a503..dc3e282 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1054,7 +1054,7 @@ int main(int argc, char *argv[])
 				fprintf(stderr, Name ": No devices listed in %s\n", configfile?configfile:DefaultConfFile);
 				exit(1);
 			}
-			rv = Examine(devlist, scan?(verbose>1?0:verbose+1):brief, scan, SparcAdjust, ss);
+			rv = Examine(devlist, scan?(verbose>1?0:verbose+1):brief, scan, SparcAdjust, ss, homehost);
 		} else {
 			if (devlist == NULL) {
 				if (devmode=='D' && scan) {
diff --git a/mdadm.h b/mdadm.h
index 2a2529f..25c8b8f 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -272,7 +272,7 @@ extern char *map_dev(int major, int minor, int create);
 
 
 extern struct superswitch {
-	void (*examine_super)(void *sbv);
+	void (*examine_super)(void *sbv, char *homehost);
 	void (*brief_examine_super)(void *sbv);
 	void (*detail_super)(void *sbv, char *homehost);
 	void (*brief_detail_super)(void *sbv);
@@ -361,7 +361,7 @@ extern int Create(struct supertype *st, char *mddev, int mdfd,
 extern int Detail(char *dev, int brief, int test, char *homehost);
 extern int Query(char *dev);
 extern int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust,
-		   struct supertype *forcest);
+		   struct supertype *forcest, char *homehost);
 extern int Monitor(mddev_dev_t devlist,
 		   char *mailaddr, char *alert_cmd,
 		   int period, int daemonise, int scan, int oneshot,
diff --git a/super0.c b/super0.c
index d1fbfae..dbf59c8 100644
--- a/super0.c
+++ b/super0.c
@@ -84,7 +84,7 @@ void super0_swap_endian(struct mdp_superblock_s *sb)
 
 #ifndef MDASSEMBLE
 
-static void examine_super0(void *sbv)
+static void examine_super0(void *sbv, char *homehost)
 {
 	mdp_super_t *sb = sbv;
 	time_t atime;
@@ -94,10 +94,18 @@ static void examine_super0(void *sbv)
 	printf("          Magic : %08x\n", sb->md_magic);
 	printf("        Version : %02d.%02d.%02d\n", sb->major_version, sb->minor_version,
 	       sb->patch_version);
-	if (sb->minor_version >= 90)
-		printf("           UUID : %08x:%08x:%08x:%08x\n", sb->set_uuid0, sb->set_uuid1,
+	if (sb->minor_version >= 90) {
+		printf("           UUID : %08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 		       sb->set_uuid2, sb->set_uuid3);
-	else
+		if (homehost) {
+			unsigned char *hash = SHA1((unsigned char *)homehost,
+						   strlen(homehost),
+						   NULL);
+			if (memcmp(&sb->set_uuid2, hash, 8)==0)
+				printf(" (local to host %s)", homehost);
+		}
+		printf("\n");
+	} else
 		printf("           UUID : %08x\n", sb->set_uuid0);
 
 	atime = sb->ctime;
diff --git a/super1.c b/super1.c
index 77118d4..b1ea298 100644
--- a/super1.c
+++ b/super1.c
@@ -136,7 +136,7 @@ static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
 }
 
 #ifndef MDASSEMBLE
-static void examine_super1(void *sbv)
+static void examine_super1(void *sbv, char *homehost)
 {
 	struct mdp_superblock_1 *sb = sbv;
 	time_t atime;
@@ -144,6 +144,7 @@ static void examine_super1(void *sbv)
 	int faulty;
 	int i;
 	char *c;
+	int l = homehost ? strlen(homehost) : 0;
 
 	printf("          Magic : %08x\n", __le32_to_cpu(sb->magic));
 	printf("        Version : %02d\n", 1);
@@ -154,8 +155,12 @@ static void examine_super1(void *sbv)
 		printf("%02x", sb->set_uuid[i]);
 	}
 	printf("\n");
-	printf("           Name : %.32s\n", sb->set_name);
-
+	printf("           Name : %.32s", sb->set_name);
+	if (l > 0 && l < 32 &&
+	    sb->set_name[l] == ':' &&
+	    strncmp(sb->set_name, homehost, l) == 0)
+		printf("  (local to host %s)", homehost);
+	printf("\n");
 	atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL;
 	printf("  Creation Time : %.24s\n", ctime(&atime));
 	c=map_num(pers, __le32_to_cpu(sb->level));