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#pragma once
#include <shared/flags.h>
#include <shared/types.h>
#include <stdbool.h>
enum vfs_backend_type {
VFS_BACK_ROOT,
VFS_BACK_USER,
};
// describes something which can act as an access function
struct vfs_backend {
enum vfs_backend_type type;
// only used with VFS_BACK_USER
struct process *handler;
struct process *queue;
};
// describes an in-process vfs call
struct vfs_request {
enum vfs_operation type;
struct {
bool kern; // if false: use .buf ; if true: use .buf_kern
union {
char __user *buf;
char *buf_kern;
};
int len;
} input;
struct {
char __user *buf;
int len;
} output;
int id; // handle.file.id
int offset;
struct process *caller;
struct vfs_backend *backend;
};
/** Assigns the vfs_request to the caller, and calls the backend. Might not
* return - can switch processes! */
int vfs_request_create(struct vfs_request);
_Noreturn void vfs_request_pass2handler(struct vfs_request *);
int vfs_request_finish(struct vfs_request *, int ret);
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