1 /*
2 * Copyright (c) 2014 Fujitsu Ltd.
3 * Author: Xiaoguang Wang <wangxg.fnst@cn.fujitsu.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #include <string.h>
19 #include <errno.h>
20 #include <sys/types.h>
21 #include <sys/stat.h>
22 #include <unistd.h>
23
24 #include "test.h"
25 #include "usctest.h"
26 #include "safe_macros.h"
27
28 #define MAX_SANE_HARD_LINKS 65535
29
30 /*
31 * filesystems whose subdir limit is less than MAX_SANE_HARD_LINKS
32 * XXX: we cannot filter ext4 out, because ext2/ext3/ext4 have the
33 * same magic number
34 */
35 const long subdir_limit_whitelist[] = {
36 TST_EXT2_OLD_MAGIC, TST_EXT234_MAGIC, TST_MINIX_MAGIC,
37 TST_MINIX_MAGIC2, TST_MINIX2_MAGIC, TST_MINIX2_MAGIC2,
38 TST_MINIX3_MAGIC, TST_UDF_MAGIC, TST_SYSV2_MAGIC,
39 TST_SYSV4_MAGIC, TST_UFS_MAGIC, TST_UFS2_MAGIC,
40 TST_F2FS_MAGIC, TST_NILFS_MAGIC, TST_EXOFS_MAGIC
41 };
42
tst_fs_fill_hardlinks_(void (* cleanup)(void),const char * dir)43 int tst_fs_fill_hardlinks_(void (*cleanup) (void), const char *dir)
44 {
45 unsigned int i, j;
46 char base_filename[PATH_MAX], link_filename[PATH_MAX];
47 struct stat s;
48
49 if (stat(dir, &s) == -1 && errno == ENOENT)
50 SAFE_MKDIR(cleanup, dir, 0744);
51
52 SAFE_STAT(cleanup, dir, &s);
53 if (!S_ISDIR(s.st_mode))
54 tst_brkm(TBROK, cleanup, "%s is not directory", dir);
55
56 sprintf(base_filename, "%s/testfile0", dir);
57 SAFE_TOUCH(cleanup, base_filename, 0644, NULL);
58
59 for (i = 1; i < MAX_SANE_HARD_LINKS; i++) {
60 sprintf(link_filename, "%s/testfile%d", dir, i);
61
62 if (link(base_filename, link_filename) == 0)
63 continue;
64
65 switch (errno) {
66 case EMLINK:
67 SAFE_STAT(cleanup, base_filename, &s);
68 if (s.st_nlink != i) {
69 tst_brkm(TBROK, cleanup, "wrong number of "
70 "hard links for %s have %i, should be"
71 " %d", base_filename,
72 (int)s.st_nlink, i);
73 } else {
74 tst_resm(TINFO, "the maximum number of hard "
75 "links to %s is hit: %d",
76 base_filename, (int)s.st_nlink);
77 return s.st_nlink;
78 }
79 case ENOSPC:
80 case EDQUOT:
81 tst_resm(TINFO | TERRNO, "link(%s, %s) failed",
82 base_filename, link_filename);
83 goto max_hardlinks_cleanup;
84 default:
85 tst_brkm(TBROK, cleanup, "link(%s, %s) failed "
86 "unexpectedly: %s", base_filename,
87 link_filename, strerror(errno));
88 }
89 }
90
91 tst_resm(TINFO, "Failed reach the hardlinks limit");
92
93 max_hardlinks_cleanup:
94 for (j = 0; j < i; j++) {
95 sprintf(link_filename, "%s/testfile%d", dir, j);
96 SAFE_UNLINK(cleanup, link_filename);
97 }
98
99 return 0;
100 }
101
tst_fs_fill_subdirs_(void (* cleanup)(void),const char * dir)102 int tst_fs_fill_subdirs_(void (*cleanup) (void), const char *dir)
103 {
104 unsigned int i, j, whitelist_size;
105 char dirname[PATH_MAX];
106 struct stat s;
107 long fs_type;
108
109 if (stat(dir, &s) == -1 && errno == ENOENT)
110 SAFE_MKDIR(cleanup, dir, 0744);
111
112 SAFE_STAT(cleanup, dir, &s);
113 if (!S_ISDIR(s.st_mode))
114 tst_brkm(TBROK, cleanup, "%s is not directory", dir);
115
116 /* for current kernel, subdir limit is not availiable for all fs */
117 fs_type = tst_fs_type(cleanup, dir);
118
119 whitelist_size = ARRAY_SIZE(subdir_limit_whitelist);
120 for (i = 0; i < whitelist_size; i++) {
121 if (fs_type == subdir_limit_whitelist[i])
122 break;
123 }
124 if (i == whitelist_size) {
125 tst_resm(TINFO, "subdir limit is not availiable for "
126 "%s filesystem", tst_fs_type_name(fs_type));
127 return 0;
128 }
129
130 for (i = 0; i < MAX_SANE_HARD_LINKS; i++) {
131 sprintf(dirname, "%s/testdir%d", dir, i);
132
133 if (mkdir(dirname, 0755) == 0)
134 continue;
135
136 switch (errno) {
137 case EMLINK:
138 SAFE_STAT(cleanup, dir, &s);
139 /*
140 * i+2 because there are two links to each newly
141 * created directory (the '.' and link from parent dir)
142 */
143 if (s.st_nlink != (i + 2)) {
144 tst_brkm(TBROK, cleanup, "%s link counts have"
145 "%d, should be %d", dir,
146 (int)s.st_nlink, i + 2);
147 } else {
148 tst_resm(TINFO, "the maximum subdirectories in "
149 "%s is hit: %d", dir, (int)s.st_nlink);
150 return s.st_nlink;
151 }
152 case ENOSPC:
153 case EDQUOT:
154 tst_resm(TINFO | TERRNO, "mkdir(%s, 0755) failed",
155 dirname);
156 goto max_subdirs_cleanup;
157 default:
158 tst_brkm(TBROK, cleanup, "mkdir(%s, 0755) failed "
159 "unexpectedly: %s", dirname,
160 strerror(errno));
161 }
162
163 }
164
165 tst_resm(TINFO, "Failed reach the subdirs limit on %s filesystem",
166 tst_fs_type_name(fs_type));
167
168 max_subdirs_cleanup:
169 for (j = 0; j < i; j++) {
170 sprintf(dirname, "%s/testdir%d", dir, j);
171 SAFE_RMDIR(cleanup, dirname);
172 }
173
174 return 0;
175 }
176