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/*
* Copyright (C) 2013-2019 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* This code is a complete clean re-write of the stress tool by
* Colin Ian King <colin.king@canonical.com> and attempts to be
* backwardly compatible with the stress tool by Amos Waterland
* <apw@rossby.metr.ou.edu> but has more stress tests and more
* functionality.
*
*/
#include "stress-ng.h"
#if defined(F_SETLEASE) && defined(F_WRLCK) && defined(F_UNLCK)
static uint64_t lease_sigio;
#endif
int stress_set_lease_breakers(const char *opt)
{
uint64_t lease_breakers;
lease_breakers = get_uint64(opt);
check_range("lease-breakers", lease_breakers,
MIN_LEASE_BREAKERS, MAX_LEASE_BREAKERS);
return set_setting("lease-breakers", TYPE_ID_UINT64, &lease_breakers);
}
#if defined(F_SETLEASE) && defined(F_WRLCK) && defined(F_UNLCK)
/*
* stress_lease_handler()
* lease signal handler
*/
static void MLOCKED_TEXT stress_lease_handler(int dummy)
{
(void)dummy;
lease_sigio++;
}
/*
* stress_lease_spawn()
* spawn a process
*/
static pid_t stress_lease_spawn(
const args_t *args,
const char *filename)
{
pid_t pid;
again:
pid = fork();
if (pid < 0) {
if (g_keep_stressing_flag && (errno == EAGAIN))
goto again;
return -1;
}
if (pid == 0) {
(void)setpgid(0, g_pgrp);
stress_parent_died_alarm();
do {
int fd;
errno = 0;
fd = open(filename, O_NONBLOCK | O_WRONLY, S_IRUSR | S_IWUSR);
if (fd < 0) {
if (errno != EWOULDBLOCK && errno != EACCES) {
pr_dbg("%s: open failed (child): errno=%d: (%s)\n",
args->name, errno, strerror(errno));
}
continue;
}
(void)close(fd);
} while (keep_stressing());
_exit(EXIT_SUCCESS);
}
(void)setpgid(pid, g_pgrp);
return pid;
}
/*
* stress_lease
* stress by fcntl lease activity
*/
static int stress_lease(const args_t *args)
{
char filename[PATH_MAX];
int ret, fd, status;
pid_t l_pids[MAX_LEASE_BREAKERS];
uint64_t i, lease_breakers = DEFAULT_LEASE_BREAKERS;
if (!get_setting("lease-breakers", &lease_breakers)) {
if (g_opt_flags & OPT_FLAGS_MAXIMIZE)
lease_breakers = MAX_LEASE_BREAKERS;
if (g_opt_flags & OPT_FLAGS_MINIMIZE)
lease_breakers = MIN_LEASE_BREAKERS;
}
(void)memset(l_pids, 0, sizeof(l_pids));
if (stress_sighandler(args->name, SIGIO, stress_lease_handler, NULL) < 0)
return EXIT_FAILURE;
ret = stress_temp_dir_mk_args(args);
if (ret < 0)
return exit_status(-ret);
(void)stress_temp_filename_args(args,
filename, sizeof(filename), mwc32());
fd = creat(filename, S_IRUSR | S_IWUSR);
if (fd < 0) {
ret = exit_status(errno);
pr_err("%s: creat failed: errno=%d: (%s)\n",
args->name, errno, strerror(errno));
(void)stress_temp_dir_rm_args(args);
return ret;
}
(void)close(fd);
for (i = 0; i < lease_breakers; i++) {
l_pids[i] = stress_lease_spawn(args, filename);
if (l_pids[i] < 0) {
pr_err("%s: failed to start all the lease breaker processes\n", args->name);
goto reap;
}
}
do {
fd = open(filename, O_WRONLY | O_APPEND, S_IRUSR | S_IWUSR);
if (fd < 0) {
ret = exit_status(errno);
pr_err("%s: open failed (parent): errno=%d: (%s)\n",
args->name, errno, strerror(errno));
goto reap;
}
while (fcntl(fd, F_SETLEASE, F_WRLCK) < 0) {
if (!g_keep_stressing_flag) {
(void)close(fd);
goto reap;
}
}
inc_counter(args);
(void)shim_sched_yield();
if (fcntl(fd, F_SETLEASE, F_UNLCK) < 0) {
pr_err("%s: fcntl failed: errno=%d: (%s)\n",
args->name, errno, strerror(errno));
(void)close(fd);
break;
}
(void)close(fd);
} while (keep_stressing());
ret = EXIT_SUCCESS;
reap:
for (i = 0; i < lease_breakers; i++) {
if (l_pids[i]) {
(void)kill(l_pids[i], SIGKILL);
(void)waitpid(l_pids[i], &status, 0);
}
}
(void)unlink(filename);
(void)stress_temp_dir_rm_args(args);
pr_dbg("%s: %" PRIu64 " lease sigio interrupts caught\n", args->name, lease_sigio);
return ret;
}
stressor_info_t stress_lease_info = {
.stressor = stress_lease,
.class = CLASS_FILESYSTEM | CLASS_OS
};
#else
stressor_info_t stress_lease_info = {
.stressor = stress_not_implemented,
.class = CLASS_FILESYSTEM | CLASS_OS
};
#endif
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