lib: fs: implement mounting filesystems; reading, writing from files

lib/libfs/file.h

@@ -3,7 +3,9 @@
 
 #include "btree.h"
 
+#include <fs/dentry.h>
 #include <fs/file.h>
+#include <fs/inode.h>
 
 struct fs_file {
 	/* id of the open file, equal to the koid of the port being used to
@@ -12,6 +14,10 @@ struct fs_file {
 	struct btree_node f_node;
 
 	const struct fs_file_ops *f_ops;
+
+	off_t f_seek;
+	struct fs_inode *f_inode;
+	struct fs_dentry *f_dent;
 };
 
 #endif