[PATCH v2 2/2] resctrl: Use exclusive lock for /sys/fs/resctrl

[Martin Kletzander]

That's the way it should've been all the time.  It was originally the case, but
then the rework to virFileFlock() made the function ambiguous when it was
created in commit 5a0a5f7fb5f5, and due to that it was misused in commit
657ddeff2313 and since then the lock being taken was shared rather than
exclusive.

Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
Reviewed-by: Andrea Bolognani <abologna at redhat.com>
---
 src/util/virresctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index b685b8bb6f7b..784a8d43bb2f 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -463,7 +463,7 @@ virResctrlLockWrite(void)
         return -1;
     }
 
-    if (virFileFlock(fd, VIR_FILE_FLOCK_SHARED) < 0) {
+    if (virFileFlock(fd, VIR_FILE_FLOCK_EXCLUSIVE) < 0) {
         virReportSystemError(errno, "%s", _("Cannot lock resctrl"));
         VIR_FORCE_CLOSE(fd);
         return -1;
-- 
2.27.0