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/*
* Copyright (c) 2014 Fujitsu Ltd.
* Author: Xiaoguang Wang <wangxg.fnst@cn.fujitsu.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "test.h"
#include "usctest.h"
#include "safe_macros.h"
#define MAX_SANE_HARD_LINKS 65535
/*
* filesystems whose subdir limit is less than MAX_SANE_HARD_LINKS
* XXX: we cannot filter ext4 out, because ext2/ext3/ext4 have the
* same magic number
*/
const long subdir_limit_whitelist[] = {
TST_EXT2_OLD_MAGIC, TST_EXT234_MAGIC, TST_MINIX_MAGIC,
TST_MINIX_MAGIC2, TST_MINIX2_MAGIC, TST_MINIX2_MAGIC2,
TST_MINIX3_MAGIC, TST_UDF_MAGIC, TST_SYSV2_MAGIC,
TST_SYSV4_MAGIC, TST_UFS_MAGIC, TST_UFS2_MAGIC,
TST_F2FS_MAGIC, TST_NILFS_MAGIC, TST_EXOFS_MAGIC
};
int tst_fs_fill_hardlinks_(void (*cleanup) (void), const char *dir)
{
unsigned int i, j;
char base_filename[PATH_MAX], link_filename[PATH_MAX];
struct stat s;
if (stat(dir, &s) == -1 && errno == ENOENT)
SAFE_MKDIR(cleanup, dir, 0744);
SAFE_STAT(cleanup, dir, &s);
if (!S_ISDIR(s.st_mode)) {
tst_brkm(TBROK, cleanup, "%s is not directory", dir);
return 0;
}
sprintf(base_filename, "%s/testfile0", dir);
SAFE_TOUCH(cleanup, base_filename, 0644, NULL);
for (i = 1; i < MAX_SANE_HARD_LINKS; i++) {
sprintf(link_filename, "%s/testfile%d", dir, i);
if (link(base_filename, link_filename) == 0)
continue;
switch (errno) {
case EMLINK:
SAFE_STAT(cleanup, base_filename, &s);
if (s.st_nlink != i) {
tst_brkm(TBROK, cleanup, "wrong number of "
"hard links for %s have %i, should be"
" %d", base_filename,
(int)s.st_nlink, i);
return 0;
} else {
tst_resm(TINFO, "the maximum number of hard "
"links to %s is hit: %d",
base_filename, (int)s.st_nlink);
return s.st_nlink;
}
case ENOSPC:
case EDQUOT:
tst_resm(TINFO | TERRNO, "link(%s, %s) failed",
base_filename, link_filename);
goto max_hardlinks_cleanup;
default:
tst_brkm(TBROK, cleanup, "link(%s, %s) failed "
"unexpectedly: %s", base_filename,
link_filename, strerror(errno));
return 0;
}
}
tst_resm(TINFO, "Failed reach the hardlinks limit");
max_hardlinks_cleanup:
for (j = 0; j < i; j++) {
sprintf(link_filename, "%s/testfile%d", dir, j);
SAFE_UNLINK(cleanup, link_filename);
}
return 0;
}
int tst_fs_fill_subdirs_(void (*cleanup) (void), const char *dir)
{
unsigned int i, j, whitelist_size;
char dirname[PATH_MAX];
struct stat s;
long fs_type;
if (stat(dir, &s) == -1 && errno == ENOENT)
SAFE_MKDIR(cleanup, dir, 0744);
SAFE_STAT(cleanup, dir, &s);
if (!S_ISDIR(s.st_mode)) {
tst_brkm(TBROK, cleanup, "%s is not directory", dir);
return 0;
}
/* for current kernel, subdir limit is not availiable for all fs */
fs_type = tst_fs_type(cleanup, dir);
whitelist_size = ARRAY_SIZE(subdir_limit_whitelist);
for (i = 0; i < whitelist_size; i++) {
if (fs_type == subdir_limit_whitelist[i])
break;
}
if (i == whitelist_size) {
tst_resm(TINFO, "subdir limit is not availiable for "
"%s filesystem", tst_fs_type_name(fs_type));
return 0;
}
for (i = 0; i < MAX_SANE_HARD_LINKS; i++) {
sprintf(dirname, "%s/testdir%d", dir, i);
if (mkdir(dirname, 0755) == 0)
continue;
switch (errno) {
case EMLINK:
SAFE_STAT(cleanup, dir, &s);
/*
* i+2 because there are two links to each newly
* created directory (the '.' and link from parent dir)
*/
if (s.st_nlink != (i + 2)) {
tst_brkm(TBROK, cleanup, "%s link counts have"
"%d, should be %d", dir,
(int)s.st_nlink, i + 2);
return 0;
} else {
tst_resm(TINFO, "the maximum subdirectories in "
"%s is hit: %d", dir, (int)s.st_nlink);
return s.st_nlink;
}
case ENOSPC:
case EDQUOT:
tst_resm(TINFO | TERRNO, "mkdir(%s, 0755) failed",
dirname);
goto max_subdirs_cleanup;
default:
tst_brkm(TBROK, cleanup, "mkdir(%s, 0755) failed "
"unexpectedly: %s", dirname,
strerror(errno));
return 0;
}
}
tst_resm(TINFO, "Failed reach the subdirs limit on %s filesystem",
tst_fs_type_name(fs_type));
max_subdirs_cleanup:
for (j = 0; j < i; j++) {
sprintf(dirname, "%s/testdir%d", dir, j);
SAFE_RMDIR(cleanup, dirname);
}
return 0;
}
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