On 04/22/2013 01:34 PM, Josh Durgin wrote:
>> + * We need to zero anything beyond the parent overlap
>> + * boundary. Since rbd_img_obj_request_read_callback()
>> + * will zero anything beyond the end of a short read, an
>> + * easy way to do this is to pretend the data from the
>> + * parent came up short--ending at the overlap boundary.
>> + */
Sorry, I missed this one.
>> + rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length);
>> + obj_end = obj_request->img_offset + obj_request->length;
>> + rbd_dev = obj_request->img_request->rbd_dev;
>> + if (obj_end > rbd_dev->parent_overlap) {
>
> Shouldn't this be >=, since the overlap is a size?
Does the overlap define the maximum byte offste included in
the overlap, or does it define the first offset not included?
If it's the former, then I agree with you (and it's not
what I thought).
-Alex
>> + u64 xferred = 0;
>> +
>> + if (obj_request->img_offset < rbd_dev->parent_overlap)
>> + xferred = rbd_dev->parent_overlap -
>> + obj_request->img_offset;
>> +
>> + obj_request->xferred = min(img_request->xferred, xferred);
>> + } else {
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