?? nbd.h
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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 * 2001 Copyright (C) Steven Whitehouse * New nbd_end_request() for compatibility with new linux block * layer code. */#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 PARANOIAextern int requests_in;extern int requests_out;#endifstatic voidnbd_end_request(struct request *req){ struct buffer_head *bh; unsigned nsect; unsigned long flags; int uptodate = (req->errors == 0) ? 1 : 0;#ifdef PARANOIA requests_out++;#endif spin_lock_irqsave(&io_request_lock, flags); while((bh = req->bh) != NULL) { nsect = bh->b_size >> 9; blk_finished_io(nsect); req->bh = bh->b_reqnext; bh->b_reqnext = NULL; bh->b_end_io(bh, uptodate); } blkdev_release_request(req); spin_unlock_irqrestore(&io_request_lock, flags);}#define MAX_NBD 128struct 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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