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t_renamerace.c revision 1.24.2.1 
      1 /*	$NetBSD: t_renamerace.c,v 1.24.2.1 2012/04/17 00:09:04 yamt 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 #include "../common/h_fsmacros.h"
     25 #include "../../h_macros.h"
     26 
     27 static volatile int quittingtime;
     28 pid_t wrkpid;
     29 
     30 static void *
     31 w1(void *arg)
     32 {
     33 	int fd;
     34 
     35 	rump_pub_lwproc_newlwp(wrkpid);
     36 
     37 	while (!quittingtime) {
     38 		fd = rump_sys_open("rename.test1",
     39 		    O_WRONLY|O_CREAT|O_TRUNC, 0666);
     40 		if (fd == -1 && errno != EEXIST)
     41 			atf_tc_fail_errno("create");
     42 		rump_sys_unlink("rename.test1");
     43 		rump_sys_close(fd);
     44 	}
     45 
     46 	return NULL;
     47 }
     48 
     49 static void *
     50 w1_dirs(void *arg)
     51 {
     52 
     53 	rump_pub_lwproc_newlwp(wrkpid);
     54 
     55 	while (!quittingtime) {
     56 		if (rump_sys_mkdir("rename.test1", 0777) == -1)
     57 			atf_tc_fail_errno("mkdir");
     58 		rump_sys_rmdir("rename.test1");
     59 	}
     60 
     61 	return NULL;
     62 }
     63 
     64 static void *
     65 w2(void *arg)
     66 {
     67 
     68 	rump_pub_lwproc_newlwp(wrkpid);
     69 
     70 	while (!quittingtime) {
     71 		rump_sys_rename("rename.test1", "rename.test2");
     72 	}
     73 
     74 	return NULL;
     75 }
     76 
     77 #define NWRK 8
     78 static void
     79 renamerace(const atf_tc_t *tc, const char *mp)
     80 {
     81 	pthread_t pt1[NWRK], pt2[NWRK];
     82 	int i;
     83 
     84 	if (FSTYPE_RUMPFS(tc))
     85 		atf_tc_skip("rename not supported by file system");
     86 
     87 	RZ(rump_pub_lwproc_rfork(RUMP_RFCFDG));
     88 	RL(wrkpid = rump_sys_getpid());
     89 
     90 	RL(rump_sys_chdir(mp));
     91 	for (i = 0; i < NWRK; i++)
     92 		pthread_create(&pt1[i], NULL, w1, NULL);
     93 
     94 	for (i = 0; i < NWRK; i++)
     95 		pthread_create(&pt2[i], NULL, w2, NULL);
     96 
     97 	sleep(5);
     98 	quittingtime = 1;
     99 
    100 	for (i = 0; i < NWRK; i++)
    101 		pthread_join(pt1[i], NULL);
    102 	for (i = 0; i < NWRK; i++)
    103 		pthread_join(pt2[i], NULL);
    104 	RL(rump_sys_chdir("/"));
    105 
    106 	if (FSTYPE_MSDOS(tc)) {
    107 		atf_tc_expect_fail("PR kern/44661");
    108 		/*
    109 		 * XXX: race does not trigger every time at least
    110 		 * on amd64/qemu.
    111 		 */
    112 		if (msdosfs_fstest_unmount(tc, mp, 0) != 0) {
    113 			rump_pub_vfs_mount_print(mp, 1);
    114 			atf_tc_fail_errno("unmount failed");
    115 		}
    116 		atf_tc_fail("race did not trigger this time");
    117 	}
    118 }
    119 
    120 static void
    121 renamerace_dirs(const atf_tc_t *tc, const char *mp)
    122 {
    123 	pthread_t pt1, pt2;
    124 
    125 	if (FSTYPE_SYSVBFS(tc))
    126 		atf_tc_skip("directories not supported by file system");
    127 
    128 	if (FSTYPE_RUMPFS(tc))
    129 		atf_tc_skip("rename not supported by file system");
    130 
    131 	/* XXX: msdosfs also sometimes hangs */
    132 	if (FSTYPE_EXT2FS(tc) || FSTYPE_MSDOS(tc))
    133 		atf_tc_expect_signal(-1, "PR kern/43626");
    134 
    135 	/* XXX: unracy execution not caught */
    136 	if (FSTYPE_P2K_FFS(tc))
    137 		atf_tc_expect_fail("PR kern/44336"); /* child dies */
    138 
    139 	RZ(rump_pub_lwproc_rfork(RUMP_RFCFDG));
    140 	RL(wrkpid = rump_sys_getpid());
    141 
    142 	RL(rump_sys_chdir(mp));
    143 	pthread_create(&pt1, NULL, w1_dirs, NULL);
    144 	pthread_create(&pt2, NULL, w2, NULL);
    145 
    146 	sleep(5);
    147 	quittingtime = 1;
    148 
    149 	pthread_join(pt1, NULL);
    150 	pthread_join(pt2, NULL);
    151 	RL(rump_sys_chdir("/"));
    152 
    153 	/*
    154 	 * Doesn't always trigger when run on a slow backend
    155 	 * (i.e. not on tmpfs/mfs).  So do the usual kludge.
    156 	 */
    157 	if (FSTYPE_EXT2FS(tc) || FSTYPE_MSDOS(tc))
    158 		abort();
    159 
    160 	if (FSTYPE_P2K_FFS(tc)) {
    161 		/* XXX: some races may hang test run if we don't unmount */
    162 		puffs_fstest_unmount(tc, mp, MNT_FORCE);
    163 		atf_tc_fail("problem did not trigger");
    164 	}
    165 }
    166 
    167 ATF_TC_FSAPPLY(renamerace, "rename(2) race with file unlinked mid-operation");
    168 ATF_TC_FSAPPLY(renamerace_dirs, "rename(2) race with directories");
    169 
    170 ATF_TP_ADD_TCS(tp)
    171 {
    172 
    173 	ATF_TP_FSAPPLY(renamerace); /* PR kern/41128 */
    174 	ATF_TP_FSAPPLY(renamerace_dirs);
    175 
    176 	return atf_no_error();
    177 }
    178