Xiaoguang Wang | 31c39f7 | 2014-07-27 17:00:54 +0800 | [diff] [blame] | 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 |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 13 | * the GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | /* |
| 17 | * Note: this test has already been in xfstests generic/028 test case, |
| 18 | * I just port it to LTP. |
| 19 | * |
| 20 | * Kernel commit '232d2d60aa5469bb097f55728f65146bd49c1d25' introduced a race |
| 21 | * condition that causes getcwd(2) to return "/" instead of correct path. |
| 22 | * 232d2d6 dcache: Translating dentry into pathname without |
| 23 | * taking rename_lock |
| 24 | * |
| 25 | * And these two kernel commits fixed the bug: |
| 26 | * ede4cebce16f5643c61aedd6d88d9070a1d23a68 |
| 27 | * prepend_path() needs to reinitialize dentry/vfsmount/mnt on restarts |
| 28 | * f6500801522c61782d4990fa1ad96154cb397cd4 |
| 29 | * f650080 __dentry_path() fixes |
| 30 | * |
| 31 | * This test is to check whether this bug exists in the running kernel, |
| 32 | * or whether this bug has been fixed. |
| 33 | * |
| 34 | */ |
| 35 | |
| 36 | #include <stdio.h> |
| 37 | #include <errno.h> |
| 38 | #include <fcntl.h> |
| 39 | #include <sys/types.h> |
| 40 | #include <unistd.h> |
Xiaoguang Wang | 31c39f7 | 2014-07-27 17:00:54 +0800 | [diff] [blame] | 41 | #include "test.h" |
| 42 | #include "safe_macros.h" |
| 43 | |
| 44 | #define TIMEOUT 5 |
| 45 | |
| 46 | static void setup(void); |
| 47 | static void cleanup(void); |
| 48 | static void do_child(void); |
| 49 | static void sigproc(int sig); |
| 50 | static volatile sig_atomic_t end; |
| 51 | static char init_cwd[PATH_MAX]; |
| 52 | |
| 53 | char *TCID = "getcwd04"; |
| 54 | int TST_TOTAL = 1; |
| 55 | |
| 56 | int main(int ac, char **av) |
| 57 | { |
| 58 | int status; |
| 59 | const char *msg; |
| 60 | char cur_cwd[PATH_MAX]; |
| 61 | pid_t child; |
| 62 | |
| 63 | msg = parse_opts(ac, av, NULL, NULL); |
| 64 | if (msg != NULL) |
| 65 | tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| 66 | |
| 67 | setup(); |
| 68 | |
| 69 | child = tst_fork(); |
| 70 | if (child < 0) |
| 71 | tst_brkm(TBROK | TERRNO, cleanup, "fork failed"); |
| 72 | |
| 73 | if (child == 0) |
| 74 | do_child(); |
| 75 | |
| 76 | while (1) { |
| 77 | SAFE_GETCWD(cleanup, cur_cwd, PATH_MAX); |
| 78 | if (strncmp(init_cwd, cur_cwd, PATH_MAX)) { |
| 79 | tst_resm(TFAIL, "initial current work directory is " |
| 80 | "%s, now is %s. Bug is reproduced!", |
| 81 | init_cwd, cur_cwd); |
| 82 | break; |
| 83 | } |
| 84 | |
| 85 | if (end) { |
| 86 | tst_resm(TPASS, "Bug is not reproduced!"); |
| 87 | break; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | SAFE_KILL(cleanup, child, SIGKILL); |
| 92 | SAFE_WAITPID(cleanup, child, &status, 0); |
| 93 | |
| 94 | cleanup(); |
| 95 | tst_exit(); |
| 96 | } |
| 97 | |
| 98 | static void setup(void) |
| 99 | { |
| 100 | tst_sig(FORK, DEF_HANDLER, cleanup); |
| 101 | |
| 102 | TEST_PAUSE; |
| 103 | |
| 104 | if (tst_ncpus() == 1) |
| 105 | tst_brkm(TCONF, NULL, "This test needs two cpus at least"); |
| 106 | |
| 107 | tst_tmpdir(); |
| 108 | |
| 109 | if (signal(SIGALRM, sigproc) == SIG_ERR) |
| 110 | tst_brkm(TBROK | TERRNO, cleanup, "signal(SIGALRM) failed"); |
| 111 | |
| 112 | alarm(TIMEOUT); |
| 113 | |
| 114 | SAFE_GETCWD(cleanup, init_cwd, PATH_MAX); |
| 115 | } |
| 116 | |
| 117 | static void sigproc(int sig) |
| 118 | { |
| 119 | end = sig; |
| 120 | } |
| 121 | |
| 122 | static void do_child(void) |
| 123 | { |
| 124 | unsigned int i = 0; |
| 125 | char c_name[PATH_MAX] = "testfile", n_name[PATH_MAX]; |
| 126 | |
| 127 | SAFE_TOUCH(NULL, c_name, 0644, NULL); |
| 128 | |
| 129 | while (1) { |
| 130 | snprintf(n_name, PATH_MAX, "testfile%u", i++); |
| 131 | SAFE_RENAME(NULL, c_name, n_name); |
| 132 | strncpy(c_name, n_name, PATH_MAX); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | static void cleanup(void) |
| 137 | { |
Xiaoguang Wang | 31c39f7 | 2014-07-27 17:00:54 +0800 | [diff] [blame] | 138 | tst_rmdir(); |
| 139 | } |