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#pragma once
#include <shared/flags.h>
#include <shared/types.h>
#include <stdbool.h>
#include <stddef.h>
// 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
*/
size_t potential_handlers; // 0 - orphaned
struct vfs_request *queue;
bool is_user;
union {
struct {
struct process *handler;
} user;
struct {
bool (*ready)(struct vfs_backend *);
// return value might be passed to caller
// TODO make return void
int (*accept)(struct vfs_request *);
} kern;
};
};
// 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
* @return same as _syscall_fs_wait, passed to it. except on calls to kern backend, where it returns the result of the fs op - also gets directly passed to caller. it's a mess */
// TODO fix the return value mess
int vfs_backend_tryaccept(struct vfs_backend *);
int vfs_backend_user_accept(struct vfs_request *req);
void vfs_backend_refdown(struct vfs_backend *);
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