static uint32_t gen_cksum(char *ptr, int len)
{
int i;
unsigned char *md;
uint32_t ret;
md = malloc(MD5_DIGEST_LENGTH);
if(!md) return 0;
/* Convert L1 table to big endian */
for(i = 0; i < len / sizeof(uint64_t); i++) {
cpu_to_be64s(&((uint64_t*) ptr)[i]);
}
/* Generate checksum */
if (MD5((unsigned char *)ptr, len, md) != md)
ret = 0;
else
memcpy(&ret, md, sizeof(uint32_t));
/* Convert L1 table back to native endianess */
for(i = 0; i < len / sizeof(uint64_t); i++) {
be64_to_cpus(&((uint64_t*) ptr)[i]);
}
free(md);
return ret;
}
static inline void bitmap_dir_entry_to_be(Qcow2BitmapDirEntry *entry)
{
cpu_to_be64s(&entry->bitmap_table_offset);
cpu_to_be32s(&entry->bitmap_table_size);
cpu_to_be32s(&entry->flags);
cpu_to_be16s(&entry->name_size);
cpu_to_be32s(&entry->extra_data_size);
}
static inline void bitmap_table_to_be(uint64_t *bitmap_table, size_t size)
{
size_t i;
for (i = 0; i < size; ++i) {
cpu_to_be64s(&bitmap_table[i]);
}
}
static uint32_t gen_cksum(char *ptr, int len)
{
int i;
uint32_t md[4];
/* Convert L1 table to big endian */
for(i = 0; i < len / sizeof(uint64_t); i++) {
cpu_to_be64s(&((uint64_t*) ptr)[i]);
}
/* Generate checksum */
gcry_md_hash_buffer(GCRY_MD_MD5, md, ptr, len);
/* Convert L1 table back to native endianess */
for(i = 0; i < len / sizeof(uint64_t); i++) {
be64_to_cpus(&((uint64_t*) ptr)[i]);
}
return md[0];
}
static void prepare_read_write (RandomIO * r)
{
/* Do a READ or WRITE? */
if (random () % 2) {
r->type = OP_READ;
} else {
r->type = OP_WRITE;
}
/* Find the next region to perform io. */
do {
if (parallel <= 1 || (random () % 2 == 0)) {
/* Perform a random I/O. */
r->sector_num = rand64 () % total_sectors;
} else {
/* Perform an I/O next to a currently ongoing I/O. */
int id;
do {
id = random () % parallel;
} while (id == r->tester);
RandomIO *p = &testers[id];
r->sector_num =
p->sector_num + 2 * io_size - rand64 () % (4 * io_size);
if (r->sector_num < 0) {
r->sector_num = 0;
} else if (r->sector_num >= total_sectors) {
r->sector_num = total_sectors - 1;
}
}
r->nb_sectors = 1 + rand64 () % io_size;
if (r->sector_num + r->nb_sectors > total_sectors) {
r->nb_sectors = total_sectors - r->sector_num;
}
} while (check_conflict (r));
if (r->type == OP_WRITE) {
/* Fill test_buf with random data. */
int i, j;
for (i = 0; i < r->nb_sectors; i++) {
const uint64_t TEST_MAGIC = 0x0123456789ABCDEFULL;
/* This first 8 bytes of the sector stores the current testing
* round. The next 8 bytes store a magic number. This info helps
* debugging. */
uint64_t *p = (uint64_t *) & r->test_buf[i * 512];
*p = r->uuid;
cpu_to_be64s (p);
p++;
*p = TEST_MAGIC;
cpu_to_be64s (p);
/* The rest of the sector are filled with random data. */
uint32_t *q = (uint32_t *) (p + 1);
int n = (512 - 2 * sizeof (uint64_t)) / sizeof (uint32_t);
for (j = 0; j < n; j++) {
*q++ = random ();
}
}
}
/* Determine the number of iov. */
int niov = 0;
uint8_t *p = r->test_buf;
int left = r->nb_sectors;
do {
if (niov == max_iov - 1) {
r->qiov.iov[niov].iov_len = left * 512;
r->qiov.iov[niov].iov_base = p;
niov++;
break;
}
int nb = 1 + random () % left;
r->qiov.iov[niov].iov_len = nb * 512;
r->qiov.iov[niov].iov_base = p;
p += r->qiov.iov[niov].iov_len;
left -= nb;
niov++;
} while (left > 0);
qemu_iovec_init_external (&r->qiov, r->qiov.iov, niov);
}