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+/*
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+ * blk-integrity.c - Block layer data integrity extensions
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+ *
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+ * Copyright (C) 2007, 2008 Oracle Corporation
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+ * Written by: Martin K. Petersen <martin.petersen@oracle.com>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License version
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+ * 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; see the file COPYING. If not, write to
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+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
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+ * USA.
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+ *
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+ */
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+
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+#include <linux/blkdev.h>
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+#include <linux/mempool.h>
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+#include <linux/bio.h>
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+#include <linux/scatterlist.h>
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+#include <linux/export.h>
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+#include <linux/slab.h>
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+
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+#include "blk.h"
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+
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+static struct kmem_cache *integrity_cachep;
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+
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+static const char *bi_unsupported_name = "unsupported";
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+
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+/**
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+ * blk_rq_count_integrity_sg - Count number of integrity scatterlist elements
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+ * @q: request queue
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+ * @bio: bio with integrity metadata attached
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+ *
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+ * Description: Returns the number of elements required in a
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+ * scatterlist corresponding to the integrity metadata in a bio.
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+ */
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+int blk_rq_count_integrity_sg(struct request_queue *q, struct bio *bio)
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+{
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+ struct bio_vec *iv, *ivprv = NULL;
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+ unsigned int segments = 0;
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+ unsigned int seg_size = 0;
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+ unsigned int i = 0;
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+
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+ bio_for_each_integrity_vec(iv, bio, i) {
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+
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+ if (ivprv) {
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+ if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
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