Initial import

1 files changed, 78 insertions, 0 deletions

diff --git a/include/uapi/linux/nbd.h b/include/uapi/linux/nbd.h
new file mode 100644
index 000000000..4f52549b2
--- /dev/null
+++ b/include/uapi/linux/nbd.h
@@ -0,0 +1,78 @@
+/*
+ * 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 _UAPILINUX_NBD_H
+#define _UAPILINUX_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
+};
+
+/* values for flags field */
+#define NBD_FLAG_HAS_FLAGS    (1 << 0) /* nbd-server supports flags */
+#define NBD_FLAG_READ_ONLY    (1 << 1) /* device is read-only */
+#define NBD_FLAG_SEND_FLUSH   (1 << 2) /* can flush writeback cache */
+/* there is a gap here to match userspace */
+#define NBD_FLAG_SEND_TRIM    (1 << 5) /* send trim/discard */
+
+#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. */
+
+/*
+ * 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;
+} __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 {
+	__be32 magic;
+	__be32 error;		/* 0 = ok, else error	*/
+	char handle[8];		/* handle you got from request	*/
+};
+#endif /* _UAPILINUX_NBD_H */