Add PG structures, begin peer connection handling code

osd_client.cpp

@@ -0,0 +1,40 @@
+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->op.rw.offset / block / 2;
+    uint64_t stripe2 = (cur_op->op.rw.offset + cur_op->op.rw.len + block*2 - 1) / block / 2 - 1;
+    for (uint64_t s = stripe1; s <= stripe2; s++)
+    {
+        uint64_t start = s == stripe1 ? cur_op->op.rw.offset - stripe1*block*2 : 0;
+        uint64_t end = s == stripe2 ? cur_op->op.rw.offset + cur_op->op.rw.len - stripe2*block*2 : block*2;
+        if (start < block)
+        {
+            read_parts.push_back({
+                .role = 1,
+                .oid = {
+                    .inode = cur_op->op.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->op.rw.inode,
+                    .stripe = (s << STRIPE_ROLE_BITS) | 2,
+                },
+                .version = UINT64_MAX,
+                .offset = (start > block ? start-block : 0),
+                .len = end - (start > block ? start-block : 0),
+            });
+        }
+    }
+}