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/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */

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* 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL.

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* Made nbd_end_request() use the io_request_lock

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* 2001 Copyright (C) Steven Whitehouse

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* New nbd_end_request() for compatibility with new linux block

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* layer code.

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* 2003/06/24 Louis D. Langholtz <ldl@aros.net>

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* Removed unneeded blksize_bits field from nbd_device struct.

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* Cleanup PARANOIA usage & code.

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* 2004/02/19 Paul Clements

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* Removed PARANOIA, plus various cleanup and comments

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#ifndef LINUX_NBD_H

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#define LINUX_NBD_H

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#include <linux/types.h>

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#define NBD_SET_SOCK _IO( 0xab, 0 )

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#define NBD_SET_BLKSIZE _IO( 0xab, 1 )

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#define NBD_SET_SIZE _IO( 0xab, 2 )

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#define NBD_DO_IT _IO( 0xab, 3 )

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#define NBD_CLEAR_SOCK _IO( 0xab, 4 )

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#define NBD_CLEAR_QUE _IO( 0xab, 5 )

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#define NBD_PRINT_DEBUG _IO( 0xab, 6 )

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#define NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 )

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#define NBD_DISCONNECT _IO( 0xab, 8 )

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#define NBD_SET_TIMEOUT _IO( 0xab, 9 )

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#define NBD_SET_FLAGS _IO( 0xab, 10)

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enum {

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NBD_CMD_READ = 0,

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NBD_CMD_WRITE = 1,

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NBD_CMD_DISC = 2,

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NBD_CMD_FLUSH = 3,

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NBD_CMD_TRIM = 4

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};

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/* values for flags field, these are server interaction specific. */

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#define NBD_FLAG_HAS_FLAGS (1 << 0) /* nbd-server supports flags */

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#define NBD_FLAG_READ_ONLY (1 << 1) /* device is read-only */

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#define NBD_FLAG_SEND_FLUSH (1 << 2) /* can flush writeback cache */

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#define NBD_FLAG_SEND_FUA (1 << 3) /* send FUA (forced unit access) */

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/* there is a gap here to match userspace */

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#define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */

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#define NBD_FLAG_CAN_MULTI_CONN (1 << 8) /* Server supports multiple connections per export. */

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/* values for cmd flags in the upper 16 bits of request type */

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#define NBD_CMD_FLAG_FUA (1 << 16) /* FUA (forced unit access) op */

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/* These are client behavior specific flags. */

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#define NBD_CFLAG_DESTROY_ON_DISCONNECT (1 << 0) /* delete the nbd device on

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disconnect. */

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#define NBD_CFLAG_DISCONNECT_ON_CLOSE (1 << 1) /* disconnect the nbd device on

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* close by last opener.

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/* userspace doesn't need the nbd_device structure */

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/* These are sent over the network in the request/reply magic fields */

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#define NBD_REQUEST_MAGIC 0x25609513

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#define NBD_REPLY_MAGIC 0x67446698

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/* Do *not* use magics: 0x12560953 0x96744668. */

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* This is the packet used for communication between client and

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* server. All data are in network byte order.

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struct nbd_request {

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__be32 magic;

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__be32 type; /* == READ || == WRITE */

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char handle[8];

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__be64 from;

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__be32 len;

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} __attribute__((packed));

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* This is the reply packet that nbd-server sends back to the client after

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* it has completed an I/O request (or an error occurs).

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struct nbd_reply {

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__be32 magic;

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__be32 error; /* 0 = ok, else error */

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char handle[8]; /* handle you got from request */

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};

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#endif /* LINUX_NBD_H */

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