g_fs_transaction_handler_start_status g_fs_transaction_handler_write::start_transaction(g_thread* thread) {
// create a context-bound wrapper for the data buffer
g_contextual<uint8_t*> bound_buffer(data()->buffer, thread->process->pageDirectory);
// check for the driver delegate
g_fs_delegate* delegate = node->get_delegate();
if (delegate == 0) {
g_log_warn("%! writing of '%i' failed due to missing delegate on underlying node %i", "filesystem", fd->id, node->id);
return G_FS_TRANSACTION_START_FAILED;
}
// check if the transaction is repeated only
if (wants_repeat_transaction()) {
// when a transaction is repeated, the waiter is still on the requesters task
delegate->request_write(thread, node, data()->length, bound_buffer, fd, this);
return G_FS_TRANSACTION_START_WITH_WAITER;
}
// start transaction by requesting the delegate
g_fs_transaction_id transaction = delegate->request_write(thread, node, data()->length, bound_buffer, fd, this);
// initially check status
if (g_waiter_fs_transaction::is_transaction_waiting(thread, this, transaction, delegate)) {
thread->wait(new g_waiter_fs_transaction(this, transaction, delegate));
return G_FS_TRANSACTION_START_WITH_WAITER;
}
return G_FS_TRANSACTION_START_IMMEDIATE_FINISH;
}
g_fs_transaction_handler_start_status g_fs_transaction_handler_read::start_transaction(g_thread* thread) {
// bind the target buffer to the requesters context
g_contextual<uint8_t*> bound_buffer(data()->buffer, thread->process->pageDirectory);
// ask the filesystem to perform a read
return g_filesystem::read(thread, node, fd, data()->length, bound_buffer, this);
}
bool vertex_buffer<Scalar, Target>::bound() const {
return bound_buffer() == handle_;
}
