diff options
Diffstat (limited to 'kernel/tests/lib/tst_fs_link_count.c')
| -rw-r--r-- | kernel/tests/lib/tst_fs_link_count.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/kernel/tests/lib/tst_fs_link_count.c b/kernel/tests/lib/tst_fs_link_count.c new file mode 100644 index 0000000..860510d --- /dev/null +++ b/kernel/tests/lib/tst_fs_link_count.c @@ -0,0 +1,183 @@ +/* + * 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; +} |