[LTP] [PATCH V5 01/10] tst_device: Add tst_is_mounted() helper

[Viresh Kumar]

This patch moves the ismount() helper added to the fsmount syscall tests
to the standard library and renames it to tst_is_mounted(). The helper
can be used across different files now.

Minor modifications are also done to the helper.

Acked-by: Li Wang <liwang@redhat.com>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 include/tst_device.h                          |  6 +++++
 lib/tst_device.c                              | 14 +++++++++++
 testcases/kernel/syscalls/fsmount/fsmount01.c | 25 +------------------
 3 files changed, 21 insertions(+), 24 deletions(-)

diff --git a/include/tst_device.h b/include/tst_device.h
index f5609f5986bb..bd6910672d2f 100644
--- a/include/tst_device.h
+++ b/include/tst_device.h
@@ -36,6 +36,12 @@ extern struct tst_device *tst_device;
  */
 int tst_umount(const char *path);
 
+/*
+ * Verifies if an earlier mount is successful or not.
+ * @path: Mount path to verify
+ */
+int tst_is_mounted(const char *path);
+
 /*
  * Clears a first few blocks of the device. This is needed when device has
  * already been formatted with a filesystems, subset of mkfs.foo utils aborts
diff --git a/lib/tst_device.c b/lib/tst_device.c
index 8b5459def1cb..8bf6dacf5973 100644
--- a/lib/tst_device.c
+++ b/lib/tst_device.c
@@ -386,6 +386,20 @@ int tst_umount(const char *path)
 	return -1;
 }
 
+int tst_is_mounted(const char *path)
+{
+	char cmd[PATH_MAX];
+	int ret;
+
+	snprintf(cmd, sizeof(cmd), "mountpoint -q %s", path);
+	ret = tst_system(cmd);
+
+	if (ret)
+		tst_resm(TINFO, "No device is mounted at %s", path);
+
+	return !ret;
+}
+
 int find_stat_file(const char *dev, char *path, size_t path_len)
 {
 	const char *devname = strrchr(dev, '/') + 1;
diff --git a/testcases/kernel/syscalls/fsmount/fsmount01.c b/testcases/kernel/syscalls/fsmount/fsmount01.c
index 83185b48aedd..8e29a1537334 100644
--- a/testcases/kernel/syscalls/fsmount/fsmount01.c
+++ b/testcases/kernel/syscalls/fsmount/fsmount01.c
@@ -12,30 +12,10 @@
 #include "tst_test.h"
 #include "lapi/fcntl.h"
 #include "lapi/fsmount.h"
-#include "tst_safe_stdio.h"
 
-#define LINELENGTH 256
 #define MNTPOINT "newmount_point"
 static int sfd, mfd, is_mounted;
 
-static int ismount(char *mntpoint)
-{
-	int ret = 0;
-	FILE *file;
-	char line[LINELENGTH];
-
-	file = SAFE_FOPEN("/proc/mounts", "r");
-
-	while (fgets(line, sizeof(line), file)) {
-		if (strstr(line, mntpoint) != NULL) {
-			ret = 1;
-			break;
-		}
-	}
-	SAFE_FCLOSE(file);
-	return ret;
-}
-
 static void cleanup(void)
 {
 	if (is_mounted)
@@ -76,12 +56,9 @@ static void test_fsmount(void)
 	tst_res(TPASS, "move_mount() attached to the mount point");
 	SAFE_CLOSE(mfd);
 
-	if (ismount(MNTPOINT)) {
-		tst_res(TPASS, "device mounted");
+	if (tst_is_mounted(MNTPOINT)) {
 		SAFE_UMOUNT(MNTPOINT);
 		is_mounted = 0;
-	} else {
-		tst_res(TFAIL, "device not mounted");
 	}
 }
 
-- 
2.21.0.rc0.269.g1a574e7a288b