[victoriafalls] Read some of the ext2 superblock as a POC

sys/victoriafalls/CMakeLists.txt

@@ -8,6 +8,7 @@ target_include_directories(victoriafalls
 target_link_libraries(victoriafalls
   glacier
   mammoth
+  yellowstone_stub
   )
 
 set_target_properties(victoriafalls PROPERTIES

sys/victoriafalls/victoriafalls.cpp

@@ -1,9 +1,28 @@
 #include <mammoth/debug.h>
 #include <mammoth/init.h>
+#include <yellowstone_stub.h>
+
+struct Superblock {
+  uint32_t inode_count;
+  uint32_t blocks_count;
+  uint32_t reserved_blocks_count;
+  uint32_t free_blocks_count;
+  uint32_t free_inodes_count;
+};
 
 uint64_t main(uint64_t init_cap) {
   ParseInitPort(init_cap);
 
   dbgln("VFs Started");
+
+  YellowstoneStub yellowstone(gInitEndpointCap);
+  ASSIGN_OR_RETURN(ScopedDenaliClient denali, yellowstone.GetDenali());
+
+  ASSIGN_OR_RETURN(MappedMemoryRegion region, denali.ReadSectors(2, 2));
+  Superblock* super = reinterpret_cast<Superblock*>(region.vaddr());
+
+  dbgln("Inodes: %x / %x", super->free_inodes_count, super->inode_count);
+  dbgln("Blocks: %x / %x", super->free_blocks_count, super->blocks_count);
+
   return 0;
 }

sys/yellowstone/yellowstone_server.cpp

@@ -98,6 +98,7 @@ void YellowstoneServer::ServerThread() {
         };
         check(ZReplyPortSend(reply_port_cap, sizeof(resp), &resp, 1,
                              &new_denali));
+        break;
       }
       default:
         dbgln("Unknown request type: %x", req->type);