From 24f6f99b3630b1a89aaa57930c5c9de8a3df9ded Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Thu, 4 Feb 2010 16:47:21 +1100
Subject: [PATCH 1/1] Having single function to read mdmon pid file.

We don't need three.
One (signal_mdmon) wasn't even being used.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 mdadm.h |  2 +-
 mdmon.c | 24 +++---------------------
 util.c  | 26 +++++++-------------------
 3 files changed, 11 insertions(+), 41 deletions(-)

diff --git a/mdadm.h b/mdadm.h
index 836c64d8..eec5c0c8 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -883,7 +883,7 @@ extern int open_mddev(char *dev, int report_errors);
 extern int open_container(int fd);
 
 extern int mdmon_running(int devnum);
-extern int signal_mdmon(int devnum);
+extern int mdmon_pid(int devnum);
 extern int check_env(char *name);
 extern __u32 random32(void);
 extern int start_mdmon(int devnum);
diff --git a/mdmon.c b/mdmon.c
index 1cdbde1d..d20bb3e4 100644
--- a/mdmon.c
+++ b/mdmon.c
@@ -148,24 +148,6 @@ int is_container_member(struct mdstat_ent *mdstat, char *container)
 	return 1;
 }
 
-pid_t devname2mdmon(char *devname)
-{
-	char buf[100];
-	pid_t pid = -1;
-	int fd;
-
-	sprintf(buf, "/var/run/mdadm/%s.pid", devname);
-	fd = open(buf, O_RDONLY|O_NOATIME);
-	if (fd < 0)
-		return -1;
-
-	if (read(fd, buf, sizeof(buf)) > 0)
-		sscanf(buf, "%d\n", &pid);
-	close(fd);
-
-	return pid;
-}
-
 static void try_kill_monitor(pid_t pid, char *devname, int sock)
 {
 	char buf[100];
@@ -373,7 +355,7 @@ static int mdmon(char *devname, int devnum, int must_fork, char *switchroot)
 
 		switch (fork()) {
 		case 0:
-			victim = devname2mdmon(devname);
+			victim = mdmon_pid(devnum);
 			victim_sock = connect_monitor(devname);
 			if (chroot(switchroot) != 0) {
 				fprintf(stderr, "mdmon: failed to chroot to '%s': %s\n",
@@ -511,7 +493,7 @@ static int mdmon(char *devname, int devnum, int must_fork, char *switchroot)
 		 * the new root
 		 */
 		if (switchroot[0] == '/') {
-			victim = devname2mdmon(container->devname);
+			victim = mdmon_pid(container->devnum);
 			victim_sock = connect_monitor(container->devname);
 		} else {
 			victim = atoi(switchroot);
@@ -527,7 +509,7 @@ static int mdmon(char *devname, int devnum, int must_fork, char *switchroot)
 			exit(3);
 		}
 		/* if there is a pid file, kill whoever is there just in case */
-		victim = devname2mdmon(container->devname);
+		victim = mdmon_pid(container->devnum);
 	}
 	if (container->ss->load_super(container, mdfd, devname)) {
 		fprintf(stderr, "mdmon: Cannot load metadata for %s\n",
diff --git a/util.c b/util.c
index 5feec43b..e5b0c1f5 100644
--- a/util.c
+++ b/util.c
@@ -1463,14 +1463,14 @@ int fd2devnum(int fd)
 	return NoMdDev;
 }
 
-int mdmon_running(int devnum)
+int mdmon_pid(int devnum)
 {
 	char path[100];
 	char pid[10];
 	int fd;
 	int n;
 	sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum));
-	fd = open(path, O_RDONLY, 0);
+	fd = open(path, O_RDONLY | O_NOATIME, 0);
 
 	if (fd < 0)
 		return 0;
@@ -1478,27 +1478,15 @@ int mdmon_running(int devnum)
 	close(fd);
 	if (n <= 0)
 		return 0;
-	if (kill(atoi(pid), 0) == 0)
-		return 1;
-	return 0;
+	return atoi(pid);
 }
 
-int signal_mdmon(int devnum)
+int mdmon_running(int devnum)
 {
-	char path[100];
-	char pid[10];
-	int fd;
-	int n;
-	sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum));
-	fd = open(path, O_RDONLY, 0);
-
-	if (fd < 0)
-		return 0;
-	n = read(fd, pid, 9);
-	close(fd);
-	if (n <= 0)
+	int pid = mdmon_pid(devnum);
+	if (pid <= 0)
 		return 0;
-	if (kill(atoi(pid), SIGUSR1) == 0)
+	if (kill(pid, 0) == 0)
 		return 1;
 	return 0;
 }
-- 
2.39.2