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/*
* 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
*/
#ifndef LINUX_NBD_H
#define LINUX_NBD_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 )
#ifdef MAJOR_NR
#include <linux/locks.h>
#include <asm/semaphore.h>
#define LOCAL_END_REQUEST
#include <linux/blk.h>
#ifdef PARANOIA
extern int requests_in;
extern int requests_out;
#endif
static int
nbd_end_request(struct request *req)
{
unsigned long flags;
int ret = 0;
#ifdef PARANOIA
requests_out++;
#endif
/*
* This is a very dirty hack that we have to do to handle
* merged requests because end_request stuff is a bit
* broken. The fact we have to do this only if there
* aren't errors looks even more silly.
*/
if (!req->errors) {
req->sector += req->current_nr_sectors;
req->nr_sectors -= req->current_nr_sectors;
}
spin_lock_irqsave(&io_request_lock, flags);
if (end_that_request_first( req, !req->errors, "nbd" ))
goto out;
ret = 1;
end_that_request_last( req );
out:
spin_unlock_irqrestore(&io_request_lock, flags);
return ret;
}
#define MAX_NBD 128
struct nbd_device {
int refcnt;
int flags;
int harderror; /* Code of hard error */
#define NBD_READ_ONLY 0x0001
#define NBD_WRITE_NOCHK 0x0002
struct socket * sock;
struct file * file; /* If == NULL, device is not ready, yet */
int magic; /* FIXME: not if debugging is off */
struct list_head queue_head; /* Requests are added here... */
struct semaphore queue_lock;
};
#endif
/* This now IS in some kind of include file... */
/* These are send over network in request/reply magic field */
#define NBD_REQUEST_MAGIC 0x25609513
#define NBD_REPLY_MAGIC 0x67446698
/* Do *not* use magics: 0x12560953 0x96744668. */
/*
* This is packet used for communication between client and
* server. All data are in network byte order.
*/
struct nbd_request {
u32 magic;
u32 type; /* == READ || == WRITE */
char handle[8];
u64 from;
u32 len;
}
#ifdef __GNUC__
__attribute__ ((packed))
#endif
;
struct nbd_reply {
u32 magic;
u32 error; /* 0 = ok, else error */
char handle[8]; /* handle you got from request */
};
#endif
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