t_renamerace.c revision 314817 
1/*	$NetBSD: t_renamerace.c,v 1.34 2017/01/13 21:30:40 christos Exp $	*/
2
3/*
4 * Modified for rump and atf from a program supplied
5 * by Nicolas Joly in kern/40948
6 */
7
8#include <sys/types.h>
9#include <sys/mount.h>
10#include <sys/utsname.h>
11
12#include <atf-c.h>
13#include <errno.h>
14#include <fcntl.h>
15#include <pthread.h>
16#include <stdio.h>
17#include <stdlib.h>
18#include <string.h>
19#include <unistd.h>
20
21#include <rump/rump.h>
22#include <rump/rump_syscalls.h>
23
24/* Bump the size of the test file system image to a larger value.
25 *
26 * These tests cause a lot of churn in the file system by creating and
27 * deleting files/directories in quick succession.  A faster CPU will cause
28 * more churn because the tests are capped by a run time period in seconds,
29 * not number of operations.
30 *
31 * This is all fine except for LFS, because the lfs_cleanerd cannot keep up
32 * with the churn and thus causes the test to fail on fast machines.  Hence
33 * the reason for this hack. */
34#define FSTEST_IMGSIZE (50000 * 512)
35
36#include "../common/h_fsmacros.h"
37#include "h_macros.h"
38
39static volatile int quittingtime;
40pid_t wrkpid;
41
42static void *
43w1(void *arg)
44{
45	int fd;
46
47	rump_pub_lwproc_newlwp(wrkpid);
48
49	while (!quittingtime) {
50		fd = rump_sys_open("rename.test1",
51		    O_WRONLY|O_CREAT|O_TRUNC, 0666);
52		if (fd == -1 && errno != EEXIST)
53			atf_tc_fail_errno("create");
54		rump_sys_unlink("rename.test1");
55		rump_sys_close(fd);
56	}
57
58	return NULL;
59}
60
61static void *
62w1_dirs(void *arg)
63{
64
65	rump_pub_lwproc_newlwp(wrkpid);
66
67	while (!quittingtime) {
68		if (rump_sys_mkdir("rename.test1", 0777) == -1)
69			atf_tc_fail_errno("mkdir");
70		rump_sys_rmdir("rename.test1");
71	}
72
73	return NULL;
74}
75
76static void *
77w2(void *arg)
78{
79
80	rump_pub_lwproc_newlwp(wrkpid);
81
82	while (!quittingtime) {
83		rump_sys_rename("rename.test1", "rename.test2");
84	}
85
86	return NULL;
87}
88
89#define NWRK 8
90static void
91renamerace(const atf_tc_t *tc, const char *mp)
92{
93	pthread_t pt1[NWRK], pt2[NWRK];
94	int i;
95
96	/*
97	 * Sysvbfs supports only 8 inodes so this test would exhaust
98	 * the inode table and creating files would fail with ENOSPC.
99	 */
100	if (FSTYPE_SYSVBFS(tc))
101		atf_tc_skip("filesystem has not enough inodes");
102	if (FSTYPE_RUMPFS(tc))
103		atf_tc_skip("rename not supported by file system");
104	if (FSTYPE_UDF(tc))
105		atf_tc_expect_fail("PR kern/49046");
106
107	RZ(rump_pub_lwproc_rfork(RUMP_RFCFDG));
108	RL(wrkpid = rump_sys_getpid());
109
110	RL(rump_sys_chdir(mp));
111	for (i = 0; i < NWRK; i++)
112		pthread_create(&pt1[i], NULL, w1, NULL);
113
114	for (i = 0; i < NWRK; i++)
115		pthread_create(&pt2[i], NULL, w2, NULL);
116
117	sleep(5);
118	quittingtime = 1;
119
120	for (i = 0; i < NWRK; i++)
121		pthread_join(pt1[i], NULL);
122	for (i = 0; i < NWRK; i++)
123		pthread_join(pt2[i], NULL);
124	RL(rump_sys_chdir("/"));
125
126	if (FSTYPE_UDF(tc))
127		atf_tc_fail("race did not trigger this time");
128
129	if (FSTYPE_MSDOS(tc)) {
130		atf_tc_expect_fail("PR kern/43626");
131		/*
132		 * XXX: race does not trigger every time at least
133		 * on amd64/qemu.
134		 */
135		if (msdosfs_fstest_unmount(tc, mp, 0) != 0) {
136			rump_pub_vfs_mount_print(mp, 1);
137			atf_tc_fail_errno("unmount failed");
138		}
139		atf_tc_fail("race did not trigger this time");
140	}
141}
142
143static void
144renamerace_dirs(const atf_tc_t *tc, const char *mp)
145{
146	pthread_t pt1, pt2;
147
148	if (FSTYPE_SYSVBFS(tc))
149		atf_tc_skip("directories not supported by file system");
150
151	if (FSTYPE_RUMPFS(tc))
152		atf_tc_skip("rename not supported by file system");
153
154	/* XXX: msdosfs also sometimes hangs */
155	if (FSTYPE_MSDOS(tc))
156		atf_tc_expect_signal(-1, "PR kern/43626");
157
158	RZ(rump_pub_lwproc_rfork(RUMP_RFCFDG));
159	RL(wrkpid = rump_sys_getpid());
160
161	RL(rump_sys_chdir(mp));
162	pthread_create(&pt1, NULL, w1_dirs, NULL);
163	pthread_create(&pt2, NULL, w2, NULL);
164
165	sleep(5);
166	quittingtime = 1;
167
168	pthread_join(pt1, NULL);
169	pthread_join(pt2, NULL);
170	RL(rump_sys_chdir("/"));
171
172	/*
173	 * Doesn't always trigger when run on a slow backend
174	 * (i.e. not on tmpfs/mfs).  So do the usual kludge.
175	 */
176	if (FSTYPE_MSDOS(tc))
177		abort();
178}
179
180ATF_TC_FSAPPLY(renamerace, "rename(2) race with file unlinked mid-operation");
181ATF_TC_FSAPPLY(renamerace_dirs, "rename(2) race with directories");
182
183ATF_TP_ADD_TCS(tp)
184{
185
186	ATF_TP_FSAPPLY(renamerace); /* PR kern/41128 */
187	ATF_TP_FSAPPLY(renamerace_dirs);
188
189	return atf_no_error();
190}
191