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/*
* Copyright (C) 2013-2017 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"
/*
* stress_rename()
* stress system by renames
*/
int stress_rename(
uint64_t *const counter,
const uint32_t instance,
const uint64_t max_ops,
const char *name)
{
char name1[PATH_MAX], name2[PATH_MAX];
char *oldname = name1, *newname = name2, *tmpname;
FILE *fp;
uint64_t i = 0;
const pid_t pid = getpid();
const uint32_t inst1 = instance * 2;
const uint32_t inst2 = inst1 + 1;
if (stress_temp_dir_mk(name, pid, inst1) < 0)
return EXIT_FAILURE;
if (stress_temp_dir_mk(name, pid, inst2) < 0) {
(void)stress_temp_dir_rm(name, pid, inst1);
return EXIT_FAILURE;
}
restart:
(void)stress_temp_filename(oldname, PATH_MAX,
name, pid, inst1, i++);
if ((fp = fopen(oldname, "w+")) == NULL) {
int rc = exit_status(errno);
pr_err(stderr, "%s: fopen failed: errno=%d: (%s)\n",
name, errno, strerror(errno));
(void)stress_temp_dir_rm(name, pid, inst1);
(void)stress_temp_dir_rm(name, pid, inst2);
return rc;
}
(void)fclose(fp);
for (;;) {
(void)stress_temp_filename(newname, PATH_MAX,
name, pid, inst2, i++);
if (rename(oldname, newname) < 0) {
(void)unlink(oldname);
(void)unlink(newname);
goto restart;
}
tmpname = oldname;
oldname = newname;
newname = tmpname;
(*counter)++;
if (!opt_do_run || (max_ops && *counter >= max_ops))
break;
(void)stress_temp_filename(newname, PATH_MAX,
name, pid, inst1, i++);
if (rename(oldname, newname) < 0) {
(void)unlink(oldname);
(void)unlink(newname);
goto restart;
}
tmpname = oldname;
oldname = newname;
newname = tmpname;
(*counter)++;
if (!opt_do_run || (max_ops && *counter >= max_ops))
break;
}
(void)unlink(oldname);
(void)unlink(newname);
(void)stress_temp_dir_rm(name, pid, inst1);
(void)stress_temp_dir_rm(name, pid, inst2);
return EXIT_SUCCESS;
}
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