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#
# Makefile for the kernel block layer
#

obj-$(CONFIG_BLOCK) := bio.o elevator.o blk-core.o blk-tag.o blk-sysfs.o \
			blk-flush.o blk-settings.o blk-ioc.o blk-map.o \
			blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \
			blk-lib.o blk-mq.o blk-mq-tag.o blk-stat.o \
			blk-mq-sysfs.o blk-mq-cpumap.o blk-mq-sched.o ioctl.o \
			genhd.o partition-generic.o ioprio.o \
			badblocks.o partitions/

obj-$(CONFIG_BOUNCE)		+= bounce.o
obj-$(CONFIG_BLK_SCSI_REQUEST)	+= scsi_ioctl.o
obj-$(CONFIG_BLK_DEV_BSG)	+= bsg.o
obj-$(CONFIG_BLK_DEV_BSGLIB)	+= bsg-lib.o
obj-$(CONFIG_BLK_CGROUP)	+= blk-cgroup.o
obj-$(CONFIG_BLK_DEV_THROTTLING)	+= blk-throttle.o
obj-$(CONFIG_IOSCHED_NOOP)	+= noop-iosched.o
obj-$(CONFIG_IOSCHED_DEADLINE)	+= deadline-iosched.o
obj-$(CONFIG_IOSCHED_CFQ)	+= cfq-iosched.o
obj-$(CONFIG_MQ_IOSCHED_DEADLINE)	+= mq-deadline.o

obj-$(CONFIG_BLOCK_COMPAT)	+= compat_ioctl.o
obj-$(CONFIG_BLK_CMDLINE_PARSER)	+= cmdline-parser.o
obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o
obj-$(CONFIG_BLK_MQ_PCI)	+= blk-mq-pci.o
obj-$(CONFIG_BLK_MQ_VIRTIO)	+= blk-mq-virtio.o
obj-$(CONFIG_BLK_DEV_ZONED)	+= blk-zoned.o
obj-$(CONFIG_BLK_WBT)		+= blk-wbt.o
obj-$(CONFIG_BLK_DEBUG_FS)	+= blk-mq-debugfs.o
obj-$(CONFIG_BLK_SED_OPAL)	+= sed-opal.o
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/*
 * bio-integrity.c - bio data integrity extensions
 *
 * Copyright (C) 2007, 2008, 2009 Oracle Corporation
 * Written by: Martin K. Petersen <martin.petersen@oracle.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
 * USA.
 *
 */

#include <linux/blkdev.h>
#include <linux/mempool.h>
#include <linux/export.h>
#include <linux/bio.h>
#include <linux/workqueue.h>
#include <linux/slab.h>

#define BIP_INLINE_VECS	4

static struct kmem_cache *bip_slab;
static struct workqueue_struct *kintegrityd_wq;

/**
 * bio_integrity_alloc - Allocate integrity payload and attach it to bio
 * @bio:	bio to attach integrity metadata to
 * @gfp_mask:	Memory allocation mask
 * @nr_vecs:	Number of integrity metadata scatter-gather elements
 *
 * Description: This function prepares a bio for attaching integrity
 * metadata.  nr_vecs specifies the maximum number of pages containing
 * integrity metadata that can be attached.
 */
struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
						  gfp_t gfp_mask,
						  unsigned int nr_vecs)
{
	struct bio_integrity_payload *bip;
	struct bio_set *bs = bio->bi_pool;
	unsigned long idx = BIO_POOL_NONE;
	unsigned inline_vecs;

	if (!bs) {
		bip = kmalloc(sizeof(struct bio_integrity_payload) +
			      sizeof(struct bio_vec) * nr_vecs, gfp_mask);
		inline_vecs = nr_vecs;
	} else {
		bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask);
		inline_vecs = BIP_INLINE_VECS;
	}

	if (unlikely(!bip))
		return NULL;

	memset(bip, 0, sizeof(*bip));

	if (nr_vecs > inline_vecs) {
		bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx,
					  bs->bvec_integrity_pool);
		if (!bip->bip_vec)
			goto err;
		bip->bip_max_vcnt = bvec_nr_vecs(idx);
	} else {
		bip->bip_vec = bip->bip_inline_vecs;
		bip->bip_max_vcnt = inline_vecs;
	}

	bip->bip_slab = idx;
	bip->bip_bio = bio;
	bio->bi_integrity = bip;
	bio->bi_rw |= REQ_INTEGRITY;

	return bip;
err:
	mempool_free(bip, bs->bio_integrity_pool);
	return NULL;
}
EXPORT_SYMBOL(bio_integrity_alloc);

/**
 * bio_integrity_free - Free bio integrity payload
 * @bio:	bio containing bip to be freed
 *
 * Description: Used to free the integrity portion of a bio. Usually
 * called from bio_free().
 */
void bio_integrity_free(struct bio *bio)
{
	struct bio_integrity_payload *bip = bio_integrity(bio);
	struct bio_set *bs = bio->bi_pool;

	if (bip->bip_flags & BIP_BLOCK_INTEGRITY)
		kfree(page_address(bip->bip_vec->bv_page) +
		      bip->bip_vec->bv_offset);

	if (bs) {
		if (bip->bip_slab != BIO_POOL_NONE)
			bvec_free(bs->bvec_integrity_pool, bip->bip_vec,
				  bip->bip_slab);

		mempool_free(bip, bs->bio_integrity_pool);
	} else {
		kfree(bip);
	}

	bio->bi_integrity = NULL;
}
EXPORT_SYMBOL(bio_integrity_free);

/**
 * bio_integrity_add_page - Attach integrity metadata
 * @bio:	bio to update
 * @page:	page containing integrity metadata
 * @len:	number of bytes of integrity metadata in page
 * @offset:	start offset within page
 *
 * Description: Attach a page containing integrity metadata to bio.
 */
int bio_integrity_add_page(struct bio *bio, struct page *page,
			   unsigned int len, unsigned int offset)
{
	struct bio_integrity_payload *bip = bio_integrity(bio);
	struct bio_vec *iv;

	if (bip->bip_vcnt >= bip->bip_max_vcnt) {
		printk(KERN_ERR "%s: bip_vec full\n", __func__);
		return 0;
	}

	iv = bip->bip_vec + bip->bip_vcnt;

	iv->bv_page = page;
	iv->bv_len = len;
	iv->bv_offset = offset;
	bip->bip_vcnt++;

	return len;
}
EXPORT_SYMBOL(bio_integrity_add_page);

/**
 * bio_integrity_enabled - Check whether integrity can be passed
 * @bio:	bio to check
 *
 * Description: Determines whether bio_integrity_prep() can be called
 * on this bio or not.	bio data direction and target device must be
 * set prior to calling.  The functions honors the write_generate and
 * read_verify flags in sysfs.
 */
bool bio_integrity_enabled(struct bio *bio)
{
	struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);

	if (!bio_is_rw(bio))
		return false;

	/* Already protected? */
	if (bio_integrity(bio))
		return false;

	if (bi == NULL)
		return false;

	if (bio_data_dir(bio) == READ && bi->verify_fn != NULL &&
	    (bi->flags & BLK_INTEGRITY_VERIFY))
		return true;

	if (bio_data_dir(bio) == WRITE && bi->generate_fn != NULL &&
	    (bi->flags & BLK_INTEGRITY_GENERATE))
		return true;

	return false;
}
EXPORT_SYMBOL(bio_integrity_enabled);

/**
 * bio_integrity_intervals - Return number of integrity intervals for a bio
 * @bi:		blk_integrity profile for device
 * @sectors:	Size of the bio in 512-byte sectors
 *
 * Description: The block layer calculates everything in 512 byte
 * sectors but integrity metadata is done in terms of the data integrity
 * interval size of the storage device.  Convert the block layer sectors
 * to the appropriate number of integrity intervals.
 */
static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
						   unsigned int sectors)
{
	return sectors >> (ilog2(bi->interval) - 9);
}

static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
					       unsigned int sectors)
{
	return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
}

/**
 * bio_integrity_process - Process integrity metadata for a bio
 * @bio:	bio to generate/verify integrity metadata for
 * @proc_fn:	Pointer to the relevant processing function
 */
static int bio_integrity_process(struct bio *bio,
				 integrity_processing_fn *proc_fn)
{
	struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
	struct blk_integrity_iter iter;
	struct bvec_iter bviter;
	struct bio_vec bv;
	struct bio_integrity_payload *bip = bio_integrity(bio);
	unsigned int ret = 0;
	void *prot_buf = page_address(bip->bip_vec->bv_page) +
		bip->bip_vec->bv_offset;

	iter.disk_name = bio->bi_bdev->bd_disk->disk_name;
	iter.interval = bi->interval;
	iter.seed = bip_get_seed(bip);
	iter.prot_buf = prot_buf;

	bio_for_each_segment(bv, bio, bviter) {
		void *kaddr = kmap_atomic(bv.bv_page);

		iter.data_buf = kaddr + bv.bv_offset;
		iter.data_size = bv.bv_len;

		ret = proc_fn(&iter);
		if (ret) {
			kunmap_atomic(kaddr);
			return ret;
		}

		kunmap_atomic(kaddr);
	}
	return ret;
}

/**
 * bio_integrity_prep - Prepare bio for integrity I/O
 * @bio:	bio to prepare
 *
 * Description: Allocates a buffer for integrity metadata, maps the
 * pages and attaches them to a bio.  The bio must have data
 * direction, target device and start sector set priot to calling.  In
 * the WRITE case, integrity metadata will be generated using the
 * block device's integrity function.  In the READ case, the buffer
 * will be prepared for DMA and a suitable end_io handler set up.
 */
int bio_integrity_prep(struct bio *bio)
{
	struct bio_integrity_payload *bip;
	struct blk_integrity *bi;
	struct request_queue *q;
	void *buf;
	unsigned long start, end;
	unsigned int len, nr_pages;
	unsigned int bytes, offset, i;
	unsigned int intervals;

	bi = bdev_get_integrity(bio->bi_bdev);
	q = bdev_get_queue(bio->bi_bdev);
	BUG_ON(bi == NULL);
	BUG_ON(bio_integrity(bio));

	intervals = bio_integrity_intervals(bi, bio_sectors(bio));

	/* Allocate kernel buffer for protection data */