Simplified distributed block storage with strong consistency, like in Ceph
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void slice()
{
// Slice the request into blockstore requests to individual objects
// Primary OSD still operates individual stripes, except they're twice the size of the blockstore's stripe.
std::vector read_parts;
int block = bs->get_block_size();
uint64_t stripe1 = cur_op->req.rw.offset / block / 2;
uint64_t stripe2 = (cur_op->req.rw.offset + cur_op->req.rw.len + block*2 - 1) / block / 2 - 1;
for (uint64_t s = stripe1; s <= stripe2; s++)
{
uint64_t start = s == stripe1 ? cur_op->req.rw.offset - stripe1*block*2 : 0;
uint64_t end = s == stripe2 ? cur_op->req.rw.offset + cur_op->req.rw.len - stripe2*block*2 : block*2;
if (start < block)
{
read_parts.push_back({
.role = 1,
.oid = {
.inode = cur_op->req.rw.inode,
.stripe = (s << STRIPE_ROLE_BITS) | 1,
},
.version = UINT64_MAX,
.offset = start,
.len = (block < end ? block : end) - start,
});
}
if (end > block)
{
read_parts.push_back({
.role = 2,
.oid = {
.inode = cur_op->req.rw.inode,
.stripe = (s << STRIPE_ROLE_BITS) | 2,
},
.version = UINT64_MAX,
.offset = (start > block ? start-block : 0),
.len = end - (start > block ? start-block : 0),
});
}
}
}