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+/*-
+ * Copyright (c) 2000 Michael Smith
+ * Copyright (c) 2000 BSDi
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+/*
+ * Backwards compatibility support.
+ */
+
+#if __FreeBSD_version < 500003 /* old buf style */
+# include <sys/buf.h>
+
+# define FREEBSD_4
+# define bio buf
+# define bioq_init(x) bufq_init(x)
+# define bioq_insert_tail(x, y) bufq_insert_tail(x, y)
+# define bioq_remove(x, y) bufq_remove(x, y)
+# define bioq_first(x) bufq_first(x)
+# define bio_queue_head buf_queue_head
+# define bio_bcount b_bcount
+# define bio_blkno b_blkno
+# define bio_caller1 b_caller1
+# define bio_data b_data
+# define bio_dev b_dev
+# define bio_driver1 b_driver1
+# define bio_driver2 b_driver2
+# define bio_error b_error
+# define bio_flags b_flags
+# define bio_pblkno b_pblkno
+# define bio_resid b_resid
+# define BIO_ERROR B_ERROR
+# define devstat_end_transaction_bio(x, y) devstat_end_transaction_buf(x, y)
+# define BIO_IS_READ(x) ((x)-b_flags & B_READ)
+
+#else
+# include <sys/bio.h>
+# define BIO_IS_READ(x) ((x)->bio_cmd == BIO_READ)
+#endif