haiku/headers/private/kernel/boot/vfs.h

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/*
** Copyright 2003, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
** Distributed under the terms of the OpenBeOS License.
*/
#ifndef KERNEL_BOOT_VFS_H
#define KERNEL_BOOT_VFS_H
#include <SupportDefs.h>
#include <util/list.h>
#include <boot/stage2_args.h>
#ifdef __cplusplus
/** This is the base class for all VFS nodes */
class Node {
public:
Node();
virtual ~Node();
virtual status_t Open(void **_cookie, int mode);
virtual status_t Close(void *cookie);
virtual ssize_t ReadAt(void *cookie, off_t pos, void *buffer, size_t bufferSize) = 0;
virtual ssize_t WriteAt(void *cookie, off_t pos, const void *buffer, size_t bufferSize) = 0;
virtual status_t GetName(char *nameBuffer, size_t bufferSize) const;
virtual int32 Type() const;
virtual off_t Size() const;
status_t Acquire();
status_t Release();
protected:
list_link fLink;
int32 fRefCount;
};
class Directory : public Node {
public:
Directory();
virtual ssize_t ReadAt(void *cookie, off_t pos, void *buffer, size_t bufferSize);
virtual ssize_t WriteAt(void *cookie, off_t pos, const void *buffer, size_t bufferSize);
virtual int32 Type() const;
virtual Node *Lookup(const char *name, bool traverseLinks) = 0;
virtual status_t GetNextEntry(void *cookie, char *nameBuffer, size_t bufferSize) = 0;
virtual status_t GetNextNode(void *cookie, Node **_node) = 0;
virtual status_t Rewind(void *cookie) = 0;
virtual status_t AddNode(Node *node);
};
/** The console based nodes don't need cookies for I/O, they
* also don't support to change the stream position.
* Live is simple in the boot loader :-)
*/
class ConsoleNode : public Node {
public:
ConsoleNode();
virtual ssize_t Read(void *buffer, size_t bufferSize);
virtual ssize_t Write(const void *buffer, size_t bufferSize);
};
/** The root file system */
extern Directory *gRoot;
extern "C" {
#endif /* __cplusplus */
extern status_t vfs_init(stage2_args *args);
extern status_t mount_boot_file_systems();
extern status_t add_partitions_for(int fd);
#ifdef __cplusplus
// this function is only available in C++
extern int open_node(Node *node, int mode);
extern int open_from(Directory *directory, const char *path, int mode);
}
#endif
#endif /* KERNEL_BOOT_VFS_H */