VFS stub

src/include/kernel/vfs.h

@@ -0,0 +1,74 @@
+#ifndef _VFS_H_INCLUDE
+#define _VFS_H_INCLUDE
+
+#include <sys/stat.h>
+#include <hashtable.h>
+#include <errno.h>
+
+struct _vnode_t;
+struct _fscalls_t;
+struct _dirnode_t;
+
+typedef struct {	
+	struct _dirnode_t* rootvnode;
+	struct _fscalls_t* calls;
+	void* data;
+} fs_t;
+
+
+typedef struct _vnode_t {
+	stat st;
+	fs_t* fs;
+	void* fsdata;
+	size_t refcount;
+	struct _dirnode_t* parent;
+} vnode_t;
+
+// folders are an expansion of vnode_t to save memory
+
+typedef struct _dirnode_t{
+	vnode_t vnode;
+	struct _dirnode_t* mountednode;
+	hashtable children;
+} dirnode_t;
+
+// fs specific calls called by the vfs on filesystems
+
+typedef struct _fscalls_t {
+	// prepares the filesystem using a filesystem data pointer and returns the root node
+	dirnode_t* (*mount)(void*);
+	// cleanup of the filesystem
+	int	 (*umount)();
+	//	 opens a file under a dirnode
+	//	 args: parent, name
+	int	 (*open)(dirnode_t*, char*);
+	//	 cleans up a vfsnode
+	//	 args: the node to clean
+	int	 (*close)(vnode_t*);
+	//	 creates a new directory with the right mode
+	//	 args: parent, name, mode
+	int	 (*mkdir)(dirnode_t* parent, char* name, mode_t mode);
+	//	 create a new file
+	//	 args: parent, name, mode
+	int	 (*create)(dirnode_t* parent, char* name, mode_t mode);
+} fscalls_t;
+
+
+int vfs_mount(dirnode_t* ref, char* device, char* mountpoint, char* fs);
+int vfs_umount(dirnode_t* ref, char* mountpoint);
+int vfs_open(vnode_t* buf, dirnode_t* ref, char* path, int flags, mode_t mode);
+int vfs_close(vnode_t* node);
+int vfs_mkdir(dirnode_t* ref, char* path, mode_t mode);
+int vfs_create(dirnode_t* ref, char* path, mode_t mode);
+
+
+void vfs_init();
+dirnode_t* vfs_root();
+void vfs_acquirenode(vnode_t* node);
+void vfs_releasenode(vnode_t* node);
+vnode_t* vfs_newnode(fs_t* fs, void* fsdata);
+dirnode_t* vfs_newdirnode(fs_t* fs, void* fsdata);
+void vfs_destroynode(vnode_t* node);
+int  vfs_resolvepath(vnode_t** result, dirnode_t* ref, char* path);
+
+#endif