Sean Christopherson <seanjc@xxxxxxxxxx> writes:
> Add a selftest to verify the basic functionality of guest_memfd():
>
> + file descriptor created with the guest_memfd() ioctl does not allow
> read/write/mmap operations
> + file size and block size as returned from fstat are as expected
> + fallocate on the fd checks that offset/length on
> fallocate(FALLOC_FL_PUNCH_HOLE) should be page aligned
>
> <snip>
> +
> +static void test_fallocate(int fd, size_t page_size, size_t total_size)
> +{
> + int ret;
> +
> + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, 0, total_size);
> + TEST_ASSERT(!ret, "fallocate with aligned offset and size should succeed");
> +
> + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
> + page_size - 1, page_size);
> + TEST_ASSERT(ret, "fallocate with unaligned offset should fail");
> +
> + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, total_size, page_size);
> + TEST_ASSERT(ret, "fallocate beginning at total_size should fail");
> +
> + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, total_size + page_size, page_size);
> + TEST_ASSERT(ret, "fallocate beginning at total_size should fail");
This should be
TEST_ASSERT(ret, "fallocate beginning after total_size should fail");
> +
> + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
> + total_size, page_size);
> + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) at total_size should succeed");
> +
> + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
> + total_size + page_size, page_size);
> + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) after total_size should succeed");
> +
> + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
> + page_size, page_size - 1);
> + TEST_ASSERT(ret, "fallocate with unaligned size should fail");
> +
> + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
> + page_size, page_size);
> + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) with aligned offset and size should succeed");
> +
> + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, page_size, page_size);
> + TEST_ASSERT(!ret, "fallocate to restore punched hole should succeed");
> +}
> <snip>
