8ed99af4a2
Fix to unmount tracefs if the self-test mounted it to allow testing.
If tracefs was already mounted, this does nothing.
Suggested-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/all/29fce076-746c-4650-8358-b4e0fa215cf7@sirena.org.uk/
Fixes: a06023a8f7 ("selftests/user_events: Fix failures when user_events is not installed")
Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
114 lines
2.1 KiB
C
114 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _USER_EVENTS_SELFTESTS_H
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#define _USER_EVENTS_SELFTESTS_H
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <unistd.h>
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#include <errno.h>
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#include "../kselftest.h"
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static inline void tracefs_unmount(void)
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{
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umount("/sys/kernel/tracing");
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}
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static inline bool tracefs_enabled(char **message, bool *fail, bool *umount)
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{
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struct stat buf;
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int ret;
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*message = "";
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*fail = false;
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*umount = false;
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/* Ensure tracefs is installed */
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ret = stat("/sys/kernel/tracing", &buf);
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if (ret == -1) {
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*message = "Tracefs is not installed";
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return false;
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}
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/* Ensure mounted tracefs */
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ret = stat("/sys/kernel/tracing/README", &buf);
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if (ret == -1 && errno == ENOENT) {
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if (mount(NULL, "/sys/kernel/tracing", "tracefs", 0, NULL) != 0) {
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*message = "Cannot mount tracefs";
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*fail = true;
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return false;
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}
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*umount = true;
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ret = stat("/sys/kernel/tracing/README", &buf);
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}
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if (ret == -1) {
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*message = "Cannot access tracefs";
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*fail = true;
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return false;
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}
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return true;
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}
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static inline bool user_events_enabled(char **message, bool *fail, bool *umount)
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{
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struct stat buf;
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int ret;
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*message = "";
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*fail = false;
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*umount = false;
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if (getuid() != 0) {
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*message = "Must be run as root";
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*fail = true;
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return false;
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}
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if (!tracefs_enabled(message, fail, umount))
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return false;
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/* Ensure user_events is installed */
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ret = stat("/sys/kernel/tracing/user_events_data", &buf);
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if (ret == -1) {
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switch (errno) {
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case ENOENT:
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*message = "user_events is not installed";
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return false;
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default:
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*message = "Cannot access user_events_data";
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*fail = true;
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return false;
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}
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}
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return true;
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}
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#define USER_EVENT_FIXTURE_SETUP(statement, umount) do { \
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char *message; \
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bool fail; \
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if (!user_events_enabled(&message, &fail, &(umount))) { \
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if (fail) { \
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TH_LOG("Setup failed due to: %s", message); \
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ASSERT_FALSE(fail); \
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} \
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SKIP(statement, "Skipping due to: %s", message); \
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} \
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} while (0)
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#define USER_EVENT_FIXTURE_TEARDOWN(umount) do { \
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if ((umount)) \
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tracefs_unmount(); \
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} while (0)
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#endif /* _USER_EVENTS_SELFTESTS_H */
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