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#pragma once
#include <shared/flags.h>
#include <shared/types.h>
#include <stdbool.h>
#include <stddef.h>
enum vfs_backend_type {
VFS_BACK_ROOT,
VFS_BACK_USER,
};
// describes something which can act as an access function
struct vfs_backend {
size_t refcount;
/* references:
* struct vfs_mount
* struct vfs_request
* struct process
* struct handle
*/
enum vfs_backend_type type;
size_t potential_handlers; // 0 - orphaned
// only used with VFS_BACK_USER
struct process *handler;
struct vfs_request *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;
};
size_t len;
} input;
struct {
char __user *buf;
size_t len;
} output;
int id; // handle.file.id
int offset;
struct process *caller;
struct vfs_backend *backend;
struct vfs_request *queue_next;
};
/** Assigns the vfs_request to the caller, and dispatches the call */
int vfsreq_create(struct vfs_request);
int vfsreq_finish(struct vfs_request *, int ret);
/** Try to accept an enqueued request */
int vfs_backend_accept(struct vfs_backend *);
void vfs_backend_refdown(struct vfs_backend *);
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