nbd.h

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/*
 * 1999 Copyright (C) Pavel Machek, [email protected]. This code is GPL.
 * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne)
 *            Made nbd_end_request() use the io_request_lock
 * 2001 Copyright (C) Steven Whitehouse
 *            New nbd_end_request() for compatibility with new linux block
 *            layer code.
 * 2003/06/24 Louis D. Langholtz <[email protected]>
 *            Removed unneeded blksize_bits field from nbd_device struct.
 *            Cleanup PARANOIA usage & code.
 * 2004/02/19 Paul Clements
 *            Removed PARANOIA, plus various cleanup and comments
 */
#ifndef LINUX_NBD_H
#define LINUX_NBD_H


#include <linux/wait.h>
#include <linux/mutex.h>
#include <uapi/linux/nbd.h>

struct request;

struct nbd_device {
    int flags;
    int harderror;      /* Code of hard error           */
    struct socket * sock;
    struct file * file;     /* If == NULL, device is not ready, yet */
    int magic;

    spinlock_t queue_lock;
    struct list_head queue_head;    /* Requests waiting result */
    struct request *active_req;
    wait_queue_head_t active_wq;
    struct list_head waiting_queue; /* Requests to be sent */
    wait_queue_head_t waiting_wq;

    struct mutex tx_lock;
    struct gendisk *disk;
    int blksize;
    u64 bytesize;
    pid_t pid; /* pid of nbd-client, if attached */
    int xmit_timeout;
};

#endif