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stress-dirdeep.c
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stress-dirdeep.c
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/*
* Copyright (C) 2013-2018 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"
#include <dirent.h>
/*
* stress_set_dirdeep_dirs()
* set number of dirdeep directories from given option string
*/
void stress_set_dirdeep_dirs(const char *opt)
{
uint32_t dirdeep_dirs;
dirdeep_dirs = get_uint32(opt);
check_range("dirdeep-dirs", dirdeep_dirs, 1, 10);
set_setting("dirdeep-dirs", TYPE_ID_UINT32, &dirdeep_dirs);
}
/*
* stress_set_dirdeep_inodes()
* set max number of inodes to consume
*/
void stress_set_dirdeep_inodes(const char *opt)
{
uint64_t inodes = stress_get_filesystem_available_inodes();
uint64_t dirdeep_inodes;
dirdeep_inodes = get_uint64_percent(opt, 1, inodes,
"Cannot determine number of available free inodes");
set_setting("dirdeep-inodes", TYPE_ID_UINT64, &dirdeep_inodes);
}
/*
* stress_dir_make()
* depth-first tree creation, create lots of sub-trees with
* dirdeep_dir number of subtress per level.
*/
static void stress_dir_make(
const args_t *args,
const char *linkpath,
char *const path,
const size_t len,
const size_t path_len,
const uint32_t dirdeep_dirs,
const uint64_t dirdeep_inodes,
const uint64_t inodes_target_free,
uint64_t *min_inodes_free,
uint32_t depth)
{
uint32_t i;
int ret;
const uint64_t inodes_avail = stress_get_filesystem_available_inodes();
if (*min_inodes_free > inodes_avail)
*min_inodes_free = inodes_avail;
if (inodes_avail <= inodes_target_free)
return;
if (len + 2 >= path_len)
return;
if (!keep_stressing())
return;
errno = 0;
if (mkdir(path, S_IRUSR | S_IWUSR | S_IXUSR) < 0) {
if ((errno == ENOSPC) || (errno == ENOMEM) ||
(errno == ENAMETOOLONG) || (errno == EDQUOT) ||
(errno == EMLINK)) {
return;
}
pr_fail_err("mkdir");
return;
}
inc_counter(args);
/*
* Top level, create file to symlink and link to
*/
if (!depth) {
int fd;
fd = creat(linkpath, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (fd < 0) {
pr_fail_err("create");
return;
}
(void)close(fd);
}
path[len] = '/';
path[len + 1] = 's'; /* symlink */
path[len + 2] = '\0';
ret = symlink(linkpath, path);
(void)ret;
path[len + 1] = 'h'; /* hardlink */
ret = link(linkpath, path);
(void)ret;
for (i = 0; i < dirdeep_dirs; i++) {
path[len + 1] = '0' + i;
stress_dir_make(args, linkpath, path, len + 2, path_len,
dirdeep_dirs, dirdeep_inodes, inodes_target_free,
min_inodes_free, depth + 1);
}
path[len] = '\0';
}
/*
* stress_dir_exercise()
* exercise files and directories in the tree
*/
static void stress_dir_exercise(
const args_t *args,
char *const path,
const size_t len,
const size_t path_len)
{
struct dirent **namelist;
int n;
#if _POSIX_C_SOURCE >= 200809L
const double now = time_now();
const time_t sec = (time_t)now;
const long nsec = (long)((now - (double)sec) * 1000000000.0);
struct timespec times[2] = {
{ sec, nsec },
{ sec, nsec }
};
#endif
if (len + 2 >= path_len)
return;
n = scandir(path, &namelist, NULL, alphasort);
if (n < 0)
return;
while (n-- && keep_stressing()) {
if (namelist[n]->d_name[0] == '.')
continue;
path[len] = '/';
path[len + 1] = namelist[n]->d_name[0];
path[len + 2] = '\0';
if (isdigit((int)namelist[n]->d_name[0])) {
stress_dir_exercise(args, path, len + 2, path_len);
} else {
int fd;
/* This will update atime only */
fd = open(path, O_RDONLY);
if (fd >= 0) {
const uint16_t rnd = mwc16();
#if _POSIX_C_SOURCE >= 200809L
int ret = futimens(fd, times);
(void)ret;
#endif
/* Occasional flushing */
if (rnd >= 0xfff0) {
#if defined(HAVE_SYNCFS)
(void)syncfs(fd);
#else
(void)sync();
#endif
} else if (rnd > 0xff40) {
(void)fsync(fd);
}
(void)close(fd);
}
inc_counter(args);
}
free(namelist[n]);
}
path[len] = '\0';
free(namelist);
}
/*
* stress_dir_tidy()
* clean up all files and directories in the tree
*/
static void stress_dir_tidy(
const args_t *args,
char *const path,
const size_t len,
const size_t path_len)
{
struct dirent **namelist;
int n;
if (len + 2 >= path_len)
return;
n = scandir(path, &namelist, NULL, alphasort);
if (n < 0)
return;
while (n--) {
if (namelist[n]->d_name[0] == '.')
continue;
path[len] = '/';
path[len + 1] = namelist[n]->d_name[0];
path[len + 2] = '\0';
if (isdigit((int)namelist[n]->d_name[0]))
stress_dir_tidy(args, path, len + 2, path_len);
else
(void)unlink(path);
free(namelist[n]);
}
path[len] = '\0';
free(namelist);
(void)rmdir(path);
}
/*
* stress_dir
* stress deep recursive directory mkdir and rmdir
*/
int stress_dirdeep(const args_t *args)
{
int ret = EXIT_SUCCESS;
char path[PATH_MAX + 16];
char linkpath[sizeof(path)];
char rootpath[PATH_MAX];
size_t path_len;
uint32_t dirdeep_dirs = 1;
uint64_t dirdeep_inodes = ~0ULL;
const uint64_t inodes_avail = stress_get_filesystem_available_inodes();
uint64_t inodes_target_free;
uint64_t min_inodes_free = ~0ULL;
(void)get_setting("dirdeep-dirs", &dirdeep_dirs);
(void)get_setting("dirdeep-inodes", &dirdeep_inodes);
inodes_target_free = (inodes_avail > dirdeep_inodes) ?
inodes_avail - dirdeep_inodes : 0;
(void)stress_temp_dir_args(args, rootpath, sizeof(rootpath));
path_len = strlen(rootpath);
strncpy(linkpath, rootpath, sizeof(linkpath));
strncat(linkpath, "/f", sizeof(linkpath) - 3);
pr_inf("%s: %" PRIu64 " inodes available, exercising up to %" PRIu64 " inodes\n",
args->name, inodes_avail, inodes_avail - inodes_target_free);
strncpy(path, rootpath, sizeof(path));
stress_dir_make(args, linkpath, path, path_len, sizeof(path),
dirdeep_dirs, dirdeep_inodes, inodes_target_free, &min_inodes_free, 0);
do {
strncpy(path, rootpath, sizeof(path));
stress_dir_exercise(args, path, path_len, sizeof(path));
} while (keep_stressing());
strncpy(path, rootpath, sizeof(path));
pr_tidy("%s: removing directories\n", args->name);
stress_dir_tidy(args, path, path_len, sizeof(path));
pr_inf("%s: %" PRIu64 " inodes exercised\n", args->name, inodes_avail - min_inodes_free);
if (inodes_target_free < min_inodes_free)
pr_inf("%s: note: specifying a larger --dirdeep setting or "
"running the stressor for longer will use more "
"inodes\n", args->name);
return ret;
}