File autofs-5-1-1-use-monotonic-clock-for-direct-mount-condition.patch of Package autofs.6209

From: Yu Ning <ning.yu@ubuntu.com>
Subject: autofs-5.1.1 - use monotonic clock for direct mount condition
Git-repo: git://git.kernel.org/pub/scm/linux/storage/autofs/autofs.git
Git-commit: ebfd6834999c3dd25e1b323bdd4908c77caef930
Patch-mainline: 5.1.2
References: bsc#1046493

The time returned by gettimeofday() is affected by discontinuous jumps
in the system time, so it causes an issue that autofs may not auto
unmount a mount point if system time is manually changed by the system
administrator.

To fix the issue we need to convert to using a monotonic clock source
instead of the clock source used by gettimeofday().

Change the direct mount and expire thread creation to use a monotonic
clock source.

Signed-off-by: Yu Ning <ning.yu@ubuntu.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Acked-by: Jeff Mahoney <jeffm@suse.com>
---
 daemon/direct.c |   20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

--- a/daemon/direct.c
+++ b/daemon/direct.c
@@ -1041,7 +1041,6 @@ int handle_packet_expire_direct(struct a
 	char buf[MAX_ERR_BUF];
 	pthread_t thid;
 	struct timespec wait;
-	struct timeval now;
 	int status, state;
 
 	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
@@ -1111,9 +1110,7 @@ int handle_packet_expire_direct(struct a
 		return 1;
 	}
 
-	status = pthread_cond_init(&mt->cond, NULL);
-	if (status)
-		fatal(status);
+	pending_cond_init(mt);
 
 	status = pthread_mutex_init(&mt->mutex, NULL);
 	if (status)
@@ -1159,9 +1156,8 @@ int handle_packet_expire_direct(struct a
 
 	mt->signaled = 0;
 	while (!mt->signaled) {
-		gettimeofday(&now, NULL);
-		wait.tv_sec = now.tv_sec + 2;
-		wait.tv_nsec = now.tv_usec * 1000;
+		clock_gettime(CLOCK_MONOTONIC, &wait);
+		wait.tv_sec += 2;
 		status = pthread_cond_timedwait(&mt->cond, &mt->mutex, &wait);
 		if (status && status != ETIMEDOUT)
 			fatal(status);
@@ -1296,7 +1292,6 @@ int handle_packet_missing_direct(struct
 	char buf[MAX_ERR_BUF];
 	int status = 0;
 	struct timespec wait;
-	struct timeval now;
 	int ioctlfd, len, state;
 	unsigned int kver_major = get_kver_major();
 	unsigned int kver_minor = get_kver_minor();
@@ -1427,9 +1422,7 @@ int handle_packet_missing_direct(struct
 	}
 	memset(mt, 0, sizeof(struct pending_args));
 
-	status = pthread_cond_init(&mt->cond, NULL);
-	if (status)
-		fatal(status);
+	pending_cond_init(mt);
 
 	status = pthread_mutex_init(&mt->mutex, NULL);
 	if (status)
@@ -1478,9 +1471,8 @@ int handle_packet_missing_direct(struct
 
 	mt->signaled = 0;
 	while (!mt->signaled) {
-		gettimeofday(&now, NULL);
-		wait.tv_sec = now.tv_sec + 2;
-		wait.tv_nsec = now.tv_usec * 1000;
+		clock_gettime(CLOCK_MONOTONIC, &wait);
+		wait.tv_sec += 2;
 		status = pthread_cond_timedwait(&mt->cond, &mt->mutex, &wait);
 		if (status && status != ETIMEDOUT)
 			fatal(status);