1 files changed, 91 insertions, 0 deletions

diff --git a/include/linux/nbd.h b/include/linux/nbd.h
new file mode 100644
index 000000000000..090e210e98f0
--- /dev/null
+++ b/include/linux/nbd.h
@@ -0,0 +1,91 @@
+/*
+ * 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
+
+#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 )
+
+enum {
+        NBD_CMD_READ = 0,
+        NBD_CMD_WRITE = 1,
+        NBD_CMD_DISC = 2
+};
+
+#define nbd_cmd(req) ((req)->cmd[0])
+#define MAX_NBD 128
+
+/* userspace doesn't need the nbd_device structure */
+#ifdef __KERNEL__
+
+/* values for flags field */
+#define NBD_READ_ONLY 0x0001
+#define NBD_WRITE_NOCHK 0x0002
+
+struct nbd_device {
+        int flags;
+        int harderror;          /* Code of hard error                   */
+        struct socket * sock;
+        struct file * file;     /* If == NULL, device is not ready, yet */
+        int magic;
+        spinlock_t queue_lock;
+        struct list_head queue_head;/* Requests are added here...       */
+        struct semaphore tx_lock;
+        struct gendisk *disk;
+        int blksize;
+        u64 bytesize;
+};
+
+#endif
+
+/* 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 {
+        u32 magic;
+        u32 type;       /* == READ || == WRITE  */
+        char handle[8];
+        u64 from;
+        u32 len;
+}
+#ifdef __GNUC__
+        __attribute__ ((packed))
+#endif
+;
+
+/*
+ * 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 {
+        u32 magic;
+        u32 error;              /* 0 = ok, else error   */
+        char handle[8];         /* handle you got from request  */
+};
+#endif