int main() {
int fd;
int ret;
char *p;
char *q;
char buf[10000];
struct pagestat ps;
if ((p = mmap((void *)0x700000000000, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)) == MAP_FAILED)
err("mmap");
p[0] = 'a';
printf("p %p\n", p);
if ((q = mmap((void *)0x700000204000, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)) == MAP_FAILED)
err("mmap");
q[0] = 'a';
printf("q %p\n", q);
get_pagestat(p, &ps);
get_pagestat(p+8192, &ps);
sprintf(buf, "/proc/%d/pagemap", getpid());
fd = open(buf, O_RDONLY);
ret = pread(fd, buf, 513*8, (0x700000000 * 8));
printf("%s\n", buf);
}
int main(int argc, char *argv[]) {
int fd;
int sem;
int nrpages = 1;
int ret = 0;
int tmp = 0;
int offset = 0;
char c;
char *filename;
char *actype;
char *onerror;
char *p;
pid_t pid;
int wait_status;
uint64_t pflag;
struct sembuf sembuf;
struct pagestat pgstat;
if (argc != 5) {
printf("Usage: %s filename nrpages accesstype onerror\n", argv[0]);
exit(EXIT_FAILURE);
}
filename = argv[1];
nrpages = strtol(argv[2], NULL, 10);
actype = argv[3];
onerror = argv[4];
DEB("filename = %s, nrpages = %d, actype = %s, onerror = %s\n",
filename, nrpages, actype, onerror);
if (strcmp(onerror, "onerror") == 0)
offset = 0;
else
offset = PS;
sem = create_and_init_semaphore();
fd = open_check(filename, O_RDWR, 0);
tmp = pread(fd, rbuf, nrpages*PS, 0);
DEB("parent first read %d [%c,%c]\n", tmp, rbuf[0], rbuf[PS]);
get_semaphore(sem, &sembuf);
if ((pid = fork()) == 0) {
get_semaphore(sem, &sembuf); /* wait parent to dirty page */
p = mmap_check((void *)REFADDR, nrpages * PS,
PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (p != (void *)REFADDR)
err("mmap");
if (nrpages == 1) {
DEB("child read (after dirty) [%c]\n", p[0]);
#ifdef DEBUG
get_pagestat(p, &pgstat);
#endif
} else {
DEB("child read (after dirty) [%c,%c]\n", p[0], p[PS]);
#ifdef DEBUG
get_pagestat(p, &pgstat);
get_pagestat(p+PS, &pgstat);
#endif
}
DEB("child hwpoison to vaddr %p\n", p);
madvise(&p[0], PS, 100); /* hwpoison */
put_semaphore(sem, &sembuf);
get_semaphore(sem, &sembuf);
DEB("child terminated\n");
put_semaphore(sem, &sembuf);
get_pflags(pgstat.pfn, &pflag, 1);
exit(EXIT_SUCCESS);
} else {
DEB("parent dirty\n");
usleep(1000);
memset(wbuf, 49, nrpages * PS);
pwrite(fd, wbuf, nrpages * PS, 0);
tmp = pread(fd, rbuf, nrpages * PS, 0);
DEB("parent second read (after dirty) %d [%c,%c]\n",
tmp, rbuf[0], rbuf[PS]);
put_semaphore(sem, &sembuf); /* kick child to inject error */
get_semaphore(sem, &sembuf); /* pagecache should be hwpoison */
DEB("parent check\n");
if (strcmp(actype, "read") == 0) {
tmp = pread(fd, rbuf, PS, offset);
if (tmp < 0)
DEB("parent first read failed.\n");
tmp = pread(fd, rbuf, PS, offset);
DEB("parent read after hwpoison %d [%c,%c]\n",
tmp, rbuf[0], rbuf[PS]);
if (tmp < 0) {
ret = -1;
perror("read");
} else {
ret = 0;
}
} else if (strcmp(actype, "writefull") == 0) {
memset(wbuf, 50, nrpages * PS);
tmp = pwrite(fd, wbuf, PS, offset);
tmp = pwrite(fd, wbuf, PS, offset);
DEB("parent write after hwpoison %d\n", tmp);
if (tmp < 0) {
ret = -1;
perror("writefull");
} else {
ret = 0;
}
} else if (strcmp(actype, "writepart") == 0) {
memset(wbuf, 50, nrpages * PS);
tmp = pwrite(fd, wbuf, PS / 2, offset);
tmp = pwrite(fd, wbuf, PS / 2, offset);
DEB("parent write after hwpoison %d\n", tmp);
if (tmp < 0) {
ret = -1;
perror("writefull");
} else {
ret = 0;
}
} else if (strcmp(actype, "fsync") == 0) {
ret = fsync(fd);
ret = fsync(fd);
DEB("parent fsync after hwpoison [ret %d]\n", ret);
if (ret)
perror("fsync");
} else if (strcmp(actype, "sync_range_write") == 0) {
ret = sync_file_range(fd, offset, PS, SYNC_FILE_RANGE_WRITE);
ret = sync_file_range(fd, offset, PS, SYNC_FILE_RANGE_WRITE);
if (ret)
perror("sync_range_write");
} else if (strcmp(actype, "sync_range_wait") == 0) {
ret = sync_file_range(fd, offset, PS, SYNC_FILE_RANGE_WAIT_BEFORE);
ret = sync_file_range(fd, offset, PS, SYNC_FILE_RANGE_WAIT_BEFORE);
if (ret)
perror("sync_range_wait");
} else if (strcmp(actype, "mmapread") == 0) {
/*
* If mmap access failed, this program should be
* terminated by segmentation fault with non-zero
* returned value. So we don't set ret here.
*/
p = mmap_check((void *)REFADDR, nrpages * PS,
PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (p != (void *)REFADDR)
err("mmap");
c = p[offset];
DEB("parent mmap() read after hwpoison [%c]\n", p[offset]);
} else if (strcmp(actype, "mmapwrite") == 0) {
p = mmap_check((void *)REFADDR, nrpages * PS,
PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (p != (void *)REFADDR)
err("mmap");
memset(&p[offset], 50, PS);
DEB("parent mmap() write after hwpoison [%c]\n", p[offset]);
}
}
put_semaphore(sem, &sembuf);
waitpid(pid, &wait_status, 0);
if (!WIFEXITED(wait_status))
err("waitpid");
delete_semaphore(sem);
DEB("parent exit %d.\n", ret);
return ret;
}