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nbd.h
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nbd.h
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/*
* 1999 Copyright (C) Pavel Machek, [email protected]. 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 <[email protected]>
* 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 )
#define NBD_SET_FLAGS _IO( 0xab, 10 )
enum {
NBD_CMD_READ = 0,
NBD_CMD_WRITE = 1,
NBD_CMD_DISC = 2,
NBD_CMD_FLUSH = 3,
NBD_CMD_TRIM = 4,
NBD_CMD_WRITE_ZEROES = 6
};
#define NBD_CMD_MASK_COMMAND 0x0000ffff
#define NBD_CMD_SHIFT (16)
#define NBD_CMD_FLAG_FUA ((1 << 0) << NBD_CMD_SHIFT)
#define NBD_CMD_FLAG_NO_HOLE ((1 << 1) << NBD_CMD_SHIFT)
/* values for flags field */
#define NBD_FLAG_HAS_FLAGS (1 << 0) /* Flags are there */
#define NBD_FLAG_READ_ONLY (1 << 1) /* Device is read-only */
#define NBD_FLAG_SEND_FLUSH (1 << 2) /* Send FLUSH */
#define NBD_FLAG_SEND_FUA (1 << 3) /* Send FUA (Force Unit Access) */
#define NBD_FLAG_ROTATIONAL (1 << 4) /* Use elevator algorithm - rotational media */
#define NBD_FLAG_SEND_TRIM (1 << 5) /* Send TRIM (discard) */
#define NBD_FLAG_SEND_WRITE_ZEROES (1 << 6) /* Send NBD_CMD_WRITE_ZEROES */
#define NBD_FLAG_CAN_MULTI_CONN (1 << 8) /* multiple connections are okay */
#define nbd_cmd(req) ((req)->cmd[0])
/* userspace doesn't need the nbd_device structure */
/* 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. */
#define NBD_OPT_REPLY_MAGIC 0x3e889045565a9LL
/*
* This is the packet used for communication between client and
* server. All data are in network byte order.
*/
struct nbd_request {
uint32_t magic;
uint32_t type; /* == READ || == WRITE */
char handle[8];
uint64_t from;
uint32_t len;
} __attribute__ ((packed));
/*
* 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 {
uint32_t magic;
uint32_t error; /* 0 = ok, else error */
char handle[8]; /* handle you got from request */
};
#endif