X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=backend.c;h=1c1f2f9a1e603c084160165eb6596945de344d7a;hb=a0cb220bbb28c68fab0b175d01dcfce38a6f835c;hp=fc647098d5792e5e4aaf5e366ffcb363e01921ca;hpb=248c94366c4e5806d7356b50e39438b4ac32f8b8;p=fio.git

diff --git a/backend.c b/backend.c
index fc647098..1c1f2f9a 100644
--- a/backend.c
+++ b/backend.c
@@ -1261,6 +1261,10 @@ static int init_io_u(struct thread_data *td)
 	return 0;
 }
 
+/*
+ * This function is Linux specific.
+ * FIO_HAVE_IOSCHED_SWITCH enabled currently means it's Linux.
+ */
 static int switch_ioscheduler(struct thread_data *td)
 {
 #ifdef FIO_HAVE_IOSCHED_SWITCH
@@ -1271,7 +1275,8 @@ static int switch_ioscheduler(struct thread_data *td)
 	if (td_ioengine_flagged(td, FIO_DISKLESSIO))
 		return 0;
 
-	sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
+	assert(td->files && td->files[0]);
+	sprintf(tmp, "%s/queue/scheduler", td->files[0]->du->sysfs_root);
 
 	f = fopen(tmp, "r+");
 	if (!f) {
@@ -1359,7 +1364,7 @@ static bool keep_running(struct thread_data *td)
 		uint64_t diff;
 
 		/*
-		 * If the difference is less than the minimum IO size, we
+		 * If the difference is less than the maximum IO size, we
 		 * are done.
 		 */
 		diff = limit - ddir_rw_sum(td->io_bytes);