Got it.
2012/10/25 David Sterba <dave@xxxxxxxx>:
> On Wed, Oct 24, 2012 at 10:04:47AM +0800, Rock Lee wrote:
>> @@ -572,7 +576,7 @@ int btrfs_prepare_device(int fd, char *file, int
>> zero_end, u64 *block_count_ret,
>> discard_blocks(fd, 0, block_count);
>> }
>>
>> - ret = zero_dev_start(fd);
>> + ret = zero_dev_start(fd, block_count);
>> if (ret) {
>> fprintf(stderr, "failed to zero device start %d\n", ret);
>> exit(1);
>
> Please add a separate check for a minimal image size instead, right after
>
> 553 block_count = device_size(fd, &st);
> 554 if (block_count == 0) {
> 555 fprintf(stderr, "unable to find %s size\n", file);
> 556 exit(1);
> 557 }
> 558 if (max_block_count)
> 559 block_count = min(block_count, max_block_count);
>
> if (block_count < 2 MB ) {
> fprintf(stderr, "Image too small (less than 2MB)");
> exit
> }
>
> thanks,
> david
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