106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/*
|
|
* 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. 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 <ldl@aros.net>
|
|
* 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/types.h>
|
|
|
|
#define NBD_SET_SOCK _IO( 0xab, 0 )
|
|
#define NBD_SET_BLKSIZE _IO( 0xab, 1 )
|
|
#define NBD_SET_SIZE _IO( 0xab, 2 )
|
|
#define NBD_DO_IT _IO( 0xab, 3 )
|
|
#define NBD_CLEAR_SOCK _IO( 0xab, 4 )
|
|
#define NBD_CLEAR_QUE _IO( 0xab, 5 )
|
|
#define NBD_PRINT_DEBUG _IO( 0xab, 6 )
|
|
#define NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 )
|
|
#define NBD_DISCONNECT _IO( 0xab, 8 )
|
|
#define NBD_SET_TIMEOUT _IO( 0xab, 9 )
|
|
|
|
enum {
|
|
NBD_CMD_READ = 0,
|
|
NBD_CMD_WRITE = 1,
|
|
NBD_CMD_DISC = 2
|
|
};
|
|
|
|
#define nbd_cmd(req) ((req)->cmd[0])
|
|
#define MAX_NBD 128
|
|
|
|
/* userspace doesn't need the nbd_device structure */
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/wait.h>
|
|
#include <linux/mutex.h>
|
|
|
|
/* values for flags field */
|
|
#define NBD_READ_ONLY 0x0001
|
|
#define NBD_WRITE_NOCHK 0x0002
|
|
|
|
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 are added here... */
|
|
struct request *active_req;
|
|
wait_queue_head_t active_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
|
|
|
|
/* These are sent over the network in the request/reply magic fields */
|
|
|
|
#define NBD_REQUEST_MAGIC 0x25609513
|
|
#define NBD_REPLY_MAGIC 0x67446698
|
|
/* Do *not* use magics: 0x12560953 0x96744668. */
|
|
|
|
/*
|
|
* This is the packet used for communication between client and
|
|
* server. All data are in network byte order.
|
|
*/
|
|
struct nbd_request {
|
|
__be32 magic;
|
|
__be32 type; /* == READ || == WRITE */
|
|
char handle[8];
|
|
__be64 from;
|
|
__be32 len;
|
|
}
|
|
#ifdef __GNUC__
|
|
__attribute__ ((packed))
|
|
#endif
|
|
;
|
|
|
|
/*
|
|
* This is the reply packet that nbd-server sends back to the client after
|
|
* it has completed an I/O request (or an error occurs).
|
|
*/
|
|
struct nbd_reply {
|
|
__be32 magic;
|
|
__be32 error; /* 0 = ok, else error */
|
|
char handle[8]; /* handle you got from request */
|
|
};
|
|
#endif
|