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
  22 struct request;
  23
  24 struct 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