[feat][mdsv2] Add file session page and fixup known issues.

Author: rock-git

proto

@@ -336,7 +336,8 @@ Status MDSV2FileSystem::MkNod(Ino parent, const std::string& name, uint32_t uid,
 }
 
 Status MDSV2FileSystem::Open(Ino ino, int flags, uint64_t fh) {
-  LOG(INFO) << fmt::format("[meta.{}] open ino({}).", name_, ino);
+  LOG(INFO) << fmt::format("[meta.{}] open ino({}) flags({}).", name_, ino,
+                           flags);
 
   if ((flags & O_TRUNC) && !(flags & O_WRONLY || flags & O_RDWR)) {
     return Status::NoPermission("O_TRUNC without O_WRONLY or O_RDWR");

src/client/vfs/meta/v2/filesystem.cpp

@@ -607,8 +607,8 @@ Status MDSClient::SetAttr(Ino ino, const Attr& attr, int to_set,
   }
 
   if (to_set & kSetAttrSize) {
-    // todo: Truncate data
     request.set_length(attr.length);
+    temp_to_set |= mdsv2::kSetAttrLength;
   }
 
   request.set_to_set(temp_to_set);

src/client/vfs/meta/v2/mds_client.cpp

@@ -243,7 +243,14 @@ Status VFSImpl::Write(Ino ino, const char* buf, uint64_t size, uint64_t offset,
 
 Status VFSImpl::Flush(Ino ino, uint64_t fh) { return Status::OK(); }
 
-Status VFSImpl::Release(Ino ino, uint64_t fh) { return Status::OK(); }
+Status VFSImpl::Release(Ino ino, uint64_t fh) {
+  auto s = meta_system_->Close(ino, fh);
+  if (!s.ok()) {
+    handle_manager_->ReleaseHandler(fh);
+  }
+
+  return Status::OK();
+}
 
 Status VFSImpl::Fsync(Ino ino, int datasync, uint64_t fh) {
   return Status::OK();