The very basic root file system for the boot loader, but should be enough.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4590 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/boot/loader/RootFileSystem.cpp

@@ -0,0 +1,129 @@
+/*
+** Copyright 2003, Axel Dörfler, [email protected]. All rights reserved.
+** Distributed under the terms of the OpenBeOS License.
+*/
+
+
+#include "RootFileSystem.h"
+
+#include <OS.h>
+#include <util/kernel_cpp.h>
+
+#include <string.h>
+#include <fcntl.h>
+
+
+struct file_system_entry {
+	list_link	link;
+	Directory	*root;
+};
+
+struct dir_cookie {
+	file_system_entry *current;
+};
+
+
+RootFileSystem::RootFileSystem()
+{
+	list_init(&fList);
+}
+
+
+RootFileSystem::~RootFileSystem()
+{
+	file_system_entry *entry = NULL;
+
+	while ((entry = (file_system_entry *)list_remove_head_item(&fList)) != NULL) {
+		entry->root->Release();
+		delete entry;
+	}
+}
+
+
+status_t 
+RootFileSystem::Open(void **_cookie, int mode)
+{
+	dir_cookie *cookie = new dir_cookie();
+	if (cookie == NULL)
+		return B_NO_MEMORY;
+	
+	cookie->current = NULL;
+	*_cookie = cookie;
+
+	return B_OK;
+}
+
+
+status_t 
+RootFileSystem::Close(void *cookie)
+{
+	delete (dir_cookie *)cookie;
+	return B_OK;
+}
+
+
+Node *
+RootFileSystem::Lookup(const char *name, bool traverseLinks)
+{
+	file_system_entry *entry = NULL;
+
+	while ((entry = (file_system_entry *)list_get_next_item(&fList, entry)) != NULL) {
+		char entryName[B_OS_NAME_LENGTH];
+		if (entry->root->GetName(entryName, sizeof(entryName)) != B_OK)
+			continue;
+
+		if (!strcmp(entryName, name)) {
+			entry->root->Acquire();
+			return entry->root;
+		}
+	}
+
+	return NULL;
+}
+
+
+status_t 
+RootFileSystem::GetNextNode(void *_cookie, Node **_node)
+{
+	dir_cookie *cookie = (dir_cookie *)_cookie;
+	file_system_entry *entry;
+
+	entry = cookie->current = (file_system_entry *)list_get_next_item(&fList, cookie->current);
+	if (entry != NULL) {
+		*_node = entry->root;
+		return B_OK;
+	}
+
+	return B_ENTRY_NOT_FOUND;
+}
+
+
+status_t 
+RootFileSystem::Rewind(void *_cookie)
+{
+	dir_cookie *cookie = (dir_cookie *)_cookie;
+
+	cookie->current = NULL;
+	return B_OK;	
+}
+
+
+status_t 
+RootFileSystem::AddNode(Node *node)
+{
+	// we don't have RTTI
+	if (node->Type() != S_IFDIR)
+		return B_BAD_TYPE;
+
+	file_system_entry *entry = new file_system_entry();
+	if (entry == NULL)
+		return B_NO_MEMORY;
+
+	node->Acquire();
+	entry->root = (Directory *)node;
+
+	list_add_item(&fList, entry);
+
+	return B_OK;
+}
+

src/kernel/boot/loader/RootFileSystem.h

@@ -0,0 +1,32 @@
+/*
+** Copyright 2003, Axel Dörfler, [email protected]. All rights reserved.
+** Distributed under the terms of the OpenBeOS License.
+*/
+#ifndef ROOT_FILE_SYSTEM_H
+#define ROOT_FILE_SYSTEM_H
+
+
+#include <boot/vfs.h>
+
+
+class RootFileSystem : public Directory {
+	public:
+		RootFileSystem();
+		virtual ~RootFileSystem();
+
+		virtual status_t Open(void **_cookie, int mode);
+		virtual status_t Close(void *cookie);
+
+		virtual Node *Lookup(const char *name, bool traverseLinks);
+
+		virtual status_t GetNextNode(void *cookie, Node **_node);
+		virtual status_t Rewind(void *cookie);
+
+		virtual status_t AddNode(Node *node);
+
+	private:
+		list	fList;
+};
+
+
+#endif	/* ROOT_FILE_SYSTEM_H */