questions about rbd_discard, python API

questions about rbd_discard, python API

[Will Zhao]

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Hi all: extern "C" int rbd_discard(rbd_image_t image, uint64_t ofs, uint64_t
len)
{
librbd::ImageCtx *ictx = (librbd::ImageCtx *)image;
tracepoint(librbd, discard_enter, ictx, ictx->name.c_str(),
ictx->snap_name.c_str(), ictx->read_only, ofs, len);
if (len > std::numeric_limits<int>::max()) {
tracepoint(librbd, discard_exit, -EINVAL);
return -EINVAL;
}
int r = ictx->io_work_queue->discard(ofs, len, ictx->skip_partial_discard);
tracepoint(librbd, discard_exit, r);
return r;
} I tried to call rbd python api, rbd.Image.discard , and I found there is
limit to the parameter len , it is a uint64, but is limited by
std::numeric_limits<int>::max(), so that I can't discard too large space at
a time. So I wonder what the considerations are about this?

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