LXR linux/include/linux/nbd.h

   1/*
   2 * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL.
   3 * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne)
   4 *            Made nbd_end_request() use the io_request_lock
   5 * 2001 Copyright (C) Steven Whitehouse
   6 *            New nbd_end_request() for compatibility with new linux block
   7 *            layer code.
   8 * 2003/06/24 Louis D. Langholtz <ldl@aros.net>
   9 *            Removed unneeded blksize_bits field from nbd_device struct.
  10 *            Cleanup PARANOIA usage & code.
  11 * 2004/02/19 Paul Clements
  12 *            Removed PARANOIA, plus various cleanup and comments
  13 */
  14#ifndef LINUX_NBD_H
  15#define LINUX_NBD_H
  16
  17
  18#include <linux/wait.h>
  19#include <linux/mutex.h>
  20#include <uapi/linux/nbd.h>
  21
  22struct request;
  23
  24struct nbd_device {
  25        int flags;
  26        int harderror;          /* Code of hard error                   */
  27        struct socket * sock;   /* If == NULL, device is not ready, yet */
  28        int magic;
  29
  30        spinlock_t queue_lock;
  31        struct list_head queue_head;    /* Requests waiting result */
  32        struct request *active_req;
  33        wait_queue_head_t active_wq;
  34        struct list_head waiting_queue; /* Requests to be sent */
  35        wait_queue_head_t waiting_wq;
  36
  37        struct mutex tx_lock;
  38        struct gendisk *disk;
  39        int blksize;
  40        u64 bytesize;
  41        pid_t pid; /* pid of nbd-client, if attached */
  42        int xmit_timeout;
  43        int disconnect; /* a disconnect has been requested by user */
  44};
  45
  46#endif
  47