cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / linux / nbd.h

diff --git a/i686-linux-gnu-4.7/usr/include/linux/nbd.h b/i686-linux-gnu-4.7/usr/include/linux/nbd.h
new file mode 100644 (file)
index 0000000..f4eed87
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/linux/nbd.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
+/*
+ * 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 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
+};
+
+/* values for flags field, these are server interaction specific. */
+#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 */
+#define NBD_FLAG_SEND_FUA      (1 << 3) /* send FUA (forced unit access) */
+/* there is a gap here to match userspace */
+#define NBD_FLAG_SEND_TRIM     (1 << 5) /* send trim/discard */
+#define NBD_FLAG_CAN_MULTI_CONN        (1 << 8)        /* Server supports multiple connections per export. */
+
+/* values for cmd flags in the upper 16 bits of request type */
+#define NBD_CMD_FLAG_FUA       (1 << 16) /* FUA (forced unit access) op */
+
+/* These are client behavior specific flags. */
+#define NBD_CFLAG_DESTROY_ON_DISCONNECT        (1 << 0) /* delete the nbd device on
+                                                   disconnect. */
+#define NBD_CFLAG_DISCONNECT_ON_CLOSE (1 << 1) /* disconnect the nbd device on
+                                               *  close by last opener.
+                                               */
+
+/* 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 /* LINUX_NBD_H */