static void mfd_assert_shrink(int fd)
{
int r, fd2;
r = ftruncate(fd, MFD_DEF_SIZE / 2);
if (r < 0) {
printf("ftruncate(SHRINK) failed: %m\n");
abort();
}
mfd_assert_size(fd, MFD_DEF_SIZE / 2);
fd2 = mfd_assert_open(fd,
O_RDWR | O_CREAT | O_TRUNC,
S_IRUSR | S_IWUSR);
close(fd2);
mfd_assert_size(fd, 0);
}
static void mfd_assert_grow_write(int fd)
{
static char buf[MFD_DEF_SIZE * 8];
ssize_t l;
l = pwrite(fd, buf, sizeof(buf), 0);
if (l != sizeof(buf)) {
printf("pwrite() failed: %m\n");
abort();
}
mfd_assert_size(fd, MFD_DEF_SIZE * 8);
}
static void mfd_assert_grow(int fd)
{
int r;
r = ftruncate(fd, MFD_DEF_SIZE * 2);
if (r < 0) {
printf("ftruncate(GROW) failed: %m\n");
abort();
}
mfd_assert_size(fd, MFD_DEF_SIZE * 2);
r = fallocate(fd,
0,
0,
MFD_DEF_SIZE * 4);
if (r < 0) {
printf("fallocate(ALLOC) failed: %m\n");
abort();
}
mfd_assert_size(fd, MFD_DEF_SIZE * 4);
}
static void mfd_assert_grow_write(int fd)
{
static char *buf;
ssize_t l;
/* hugetlbfs does not support write */
if (hugetlbfs_test)
return;
buf = malloc(mfd_def_size * 8);
if (!buf) {
printf("malloc(%zu) failed: %m\n", mfd_def_size * 8);
abort();
}
l = pwrite(fd, buf, mfd_def_size * 8, 0);
if (l != (mfd_def_size * 8)) {
printf("pwrite() failed: %m\n");
abort();
}
mfd_assert_size(fd, mfd_def_size * 8);
}