[linux.git] / block / blk-integrity.c

/*
 * blk-integrity.c - Block layer data integrity extensions
 *
 * Copyright (C) 2007, 2008 Oracle Corporation
 * Written by: Martin K. Petersen <[email protected]>
 *
 * 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/bio.h>
#include <linux/scatterlist.h>

#include "blk.h"

static struct kmem_cache *integrity_cachep;

/**
 * blk_rq_count_integrity_sg - Count number of integrity scatterlist elements
 * @rq:		request with integrity metadata attached
 *
 * Description: Returns the number of elements required in a
 * scatterlist corresponding to the integrity metadata in a request.
 */
int blk_rq_count_integrity_sg(struct request *rq)
{
	struct bio_vec *iv, *ivprv;
	struct req_iterator iter;
	unsigned int segments;

	ivprv = NULL;
	segments = 0;

	rq_for_each_integrity_segment(iv, rq, iter) {

		if (!ivprv || !BIOVEC_PHYS_MERGEABLE(ivprv, iv))
			segments++;

		ivprv = iv;
	}

	return segments;
}
EXPORT_SYMBOL(blk_rq_count_integrity_sg);

/**
 * blk_rq_map_integrity_sg - Map integrity metadata into a scatterlist
 * @rq:		request with integrity metadata attached
 * @sglist:	target scatterlist
 *
 * Description: Map the integrity vectors in request into a
 * scatterlist.  The scatterlist must be big enough to hold all
 * elements.  I.e. sized using blk_rq_count_integrity_sg().
 */
int blk_rq_map_integrity_sg(struct request *rq, struct scatterlist *sglist)
{
	struct bio_vec *iv, *ivprv;
	struct req_iterator iter;
	struct scatterlist *sg;
	unsigned int segments;

	ivprv = NULL;
	sg = NULL;
	segments = 0;

	rq_for_each_integrity_segment(iv, rq, iter) {

		if (ivprv) {
			if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
				goto new_segment;

			sg->length += iv->bv_len;
		} else {
new_segment:
			if (!sg)
				sg = sglist;
			else {
				sg->page_link &= ~0x02;
				sg = sg_next(sg);
			}

			sg_set_page(sg, iv->bv_page, iv->bv_len, iv->bv_offset);
			segments++;
		}

		ivprv = iv;
	}

	if (sg)
		sg_mark_end(sg);

	return segments;
}
EXPORT_SYMBOL(blk_rq_map_integrity_sg);

/**
 * blk_integrity_compare - Compare integrity profile of two disks
 * @gd1:	Disk to compare
 * @gd2:	Disk to compare
 *
 * Description: Meta-devices like DM and MD need to verify that all
 * sub-devices use the same integrity format before advertising to
 * upper layers that they can send/receive integrity metadata.  This
 * function can be used to check whether two gendisk devices have
 * compatible integrity formats.
 */
int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)
{
	struct blk_integrity *b1 = gd1->integrity;
	struct blk_integrity *b2 = gd2->integrity;

	if (!b1 && !b2)
		return 0;

	if (!b1 || !b2)
		return -1;

	if (b1->sector_size != b2->sector_size) {
		printk(KERN_ERR "%s: %s/%s sector sz %u != %u\n", __func__,
		       gd1->disk_name, gd2->disk_name,
		       b1->sector_size, b2->sector_size);
		return -1;
	}

	if (b1->tuple_size != b2->tuple_size) {
		printk(KERN_ERR "%s: %s/%s tuple sz %u != %u\n", __func__,
		       gd1->disk_name, gd2->disk_name,
		       b1->tuple_size, b2->tuple_size);
		return -1;
	}

	if (b1->tag_size && b2->tag_size && (b1->tag_size != b2->tag_size)) {
		printk(KERN_ERR "%s: %s/%s tag sz %u != %u\n", __func__,
		       gd1->disk_name, gd2->disk_name,
		       b1->tag_size, b2->tag_size);
		return -1;
	}

	if (strcmp(b1->name, b2->name)) {
		printk(KERN_ERR "%s: %s/%s type %s != %s\n", __func__,
		       gd1->disk_name, gd2->disk_name,
		       b1->name, b2->name);
		return -1;
	}

	return 0;
}
EXPORT_SYMBOL(blk_integrity_compare);

struct integrity_sysfs_entry {
	struct attribute attr;
	ssize_t (*show)(struct blk_integrity *, char *);
	ssize_t (*store)(struct blk_integrity *, const char *, size_t);
};

static ssize_t integrity_attr_show(struct kobject *kobj, struct attribute *attr,
				   char *page)
{
	struct blk_integrity *bi =
		container_of(kobj, struct blk_integrity, kobj);
	struct integrity_sysfs_entry *entry =
		container_of(attr, struct integrity_sysfs_entry, attr);

	return entry->show(bi, page);
}

static ssize_t integrity_attr_store(struct kobject *kobj,
				    struct attribute *attr, const char *page,
				    size_t count)
{
	struct blk_integrity *bi =
		container_of(kobj, struct blk_integrity, kobj);
	struct integrity_sysfs_entry *entry =
		container_of(attr, struct integrity_sysfs_entry, attr);
	ssize_t ret = 0;

	if (entry->store)
		ret = entry->store(bi, page, count);

	return ret;
}

static ssize_t integrity_format_show(struct blk_integrity *bi, char *page)
{
	if (bi != NULL && bi->name != NULL)
		return sprintf(page, "%s\n", bi->name);
	else
		return sprintf(page, "none\n");
}

static ssize_t integrity_tag_size_show(struct blk_integrity *bi, char *page)
{
	if (bi != NULL)
		return sprintf(page, "%u\n", bi->tag_size);
	else
		return sprintf(page, "0\n");
}

static ssize_t integrity_read_store(struct blk_integrity *bi,
				    const char *page, size_t count)
{
	char *p = (char *) page;
	unsigned long val = simple_strtoul(p, &p, 10);

	if (val)
		bi->flags |= INTEGRITY_FLAG_READ;
	else
		bi->flags &= ~INTEGRITY_FLAG_READ;

	return count;
}

static ssize_t integrity_read_show(struct blk_integrity *bi, char *page)
{
	return sprintf(page, "%d\n", (bi->flags & INTEGRITY_FLAG_READ) != 0);
}

static ssize_t integrity_write_store(struct blk_integrity *bi,
				     const char *page, size_t count)
{
	char *p = (char *) page;
	unsigned long val = simple_strtoul(p, &p, 10);

	if (val)
		bi->flags |= INTEGRITY_FLAG_WRITE;
	else
		bi->flags &= ~INTEGRITY_FLAG_WRITE;

	return count;
}

static ssize_t integrity_write_show(struct blk_integrity *bi, char *page)
{
	return sprintf(page, "%d\n", (bi->flags & INTEGRITY_FLAG_WRITE) != 0);
}

static struct integrity_sysfs_entry integrity_format_entry = {
	.attr = { .name = "format", .mode = S_IRUGO },
	.show = integrity_format_show,
};

static struct integrity_sysfs_entry integrity_tag_size_entry = {
	.attr = { .name = "tag_size", .mode = S_IRUGO },
	.show = integrity_tag_size_show,
};

static struct integrity_sysfs_entry integrity_read_entry = {
	.attr = { .name = "read_verify", .mode = S_IRUGO | S_IWUSR },
	.show = integrity_read_show,
	.store = integrity_read_store,
};

static struct integrity_sysfs_entry integrity_write_entry = {
	.attr = { .name = "write_generate", .mode = S_IRUGO | S_IWUSR },
	.show = integrity_write_show,
	.store = integrity_write_store,
};

static struct attribute *integrity_attrs[] = {
	&integrity_format_entry.attr,
	&integrity_tag_size_entry.attr,
	&integrity_read_entry.attr,
	&integrity_write_entry.attr,
	NULL,
};

static struct sysfs_ops integrity_ops = {
	.show	= &integrity_attr_show,
	.store	= &integrity_attr_store,
};

static int __init blk_dev_integrity_init(void)
{
	integrity_cachep = kmem_cache_create("blkdev_integrity",
					     sizeof(struct blk_integrity),
					     0, SLAB_PANIC, NULL);
	return 0;
}
subsys_initcall(blk_dev_integrity_init);

static void blk_integrity_release(struct kobject *kobj)
{
	struct blk_integrity *bi =
		container_of(kobj, struct blk_integrity, kobj);

	kmem_cache_free(integrity_cachep, bi);
}

static struct kobj_type integrity_ktype = {
	.default_attrs	= integrity_attrs,
	.sysfs_ops	= &integrity_ops,
	.release	= blk_integrity_release,
};

/**
 * blk_integrity_register - Register a gendisk as being integrity-capable
 * @disk:	struct gendisk pointer to make integrity-aware
 * @template:	optional integrity profile to register
 *
 * Description: When a device needs to advertise itself as being able
 * to send/receive integrity metadata it must use this function to
 * register the capability with the block layer.  The template is a
 * blk_integrity struct with values appropriate for the underlying
 * hardware.  If template is NULL the new profile is allocated but
 * not filled out. See Documentation/block/data-integrity.txt.
 */
int blk_integrity_register(struct gendisk *disk, struct blk_integrity *template)
{
	struct blk_integrity *bi;

	BUG_ON(disk == NULL);

	if (disk->integrity == NULL) {
		bi = kmem_cache_alloc(integrity_cachep,
				      GFP_KERNEL | __GFP_ZERO);
		if (!bi)
			return -1;

		if (kobject_init_and_add(&bi->kobj, &integrity_ktype,
					 &disk_to_dev(disk)->kobj,
					 "%s", "integrity")) {
			kmem_cache_free(integrity_cachep, bi);
			return -1;
		}

		kobject_uevent(&bi->kobj, KOBJ_ADD);

		bi->flags |= INTEGRITY_FLAG_READ | INTEGRITY_FLAG_WRITE;
		bi->sector_size = queue_logical_block_size(disk->queue);
		disk->integrity = bi;
	} else
		bi = disk->integrity;

	/* Use the provided profile as template */
	if (template != NULL) {
		bi->name = template->name;
		bi->generate_fn = template->generate_fn;
		bi->verify_fn = template->verify_fn;
		bi->tuple_size = template->tuple_size;
		bi->set_tag_fn = template->set_tag_fn;
		bi->get_tag_fn = template->get_tag_fn;
		bi->tag_size = template->tag_size;
	} else
		bi->name = "unsupported";

	return 0;
}
EXPORT_SYMBOL(blk_integrity_register);

/**
 * blk_integrity_unregister - Remove block integrity profile
 * @disk:	disk whose integrity profile to deallocate
 *
 * Description: This function frees all memory used by the block
 * integrity profile.  To be called at device teardown.
 */
void blk_integrity_unregister(struct gendisk *disk)
{
	struct blk_integrity *bi;

	if (!disk || !disk->integrity)
		return;

	bi = disk->integrity;

	kobject_uevent(&bi->kobj, KOBJ_REMOVE);
	kobject_del(&bi->kobj);
	kobject_put(&bi->kobj);
	kmem_cache_free(integrity_cachep, bi);
	disk->integrity = NULL;
}
EXPORT_SYMBOL(blk_integrity_unregister);
Commit	Line	Data
7ba1ba12 MP	1	/*
	2	* blk-integrity.c - Block layer data integrity extensions
	3	*
	4	* Copyright (C) 2007, 2008 Oracle Corporation
	5	* Written by: Martin K. Petersen <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License version
	9	* 2 as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; see the file COPYING. If not, write to
	18	* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
	19	* USA.
	20	*
	21	*/
	22
	23	#include <linux/blkdev.h>
	24	#include <linux/mempool.h>
	25	#include <linux/bio.h>
	26	#include <linux/scatterlist.h>
	27
	28	#include "blk.h"
	29
	30	static struct kmem_cache *integrity_cachep;
	31
	32	/**
	33	* blk_rq_count_integrity_sg - Count number of integrity scatterlist elements
	34	* @rq: request with integrity metadata attached
	35	*
	36	* Description: Returns the number of elements required in a
	37	* scatterlist corresponding to the integrity metadata in a request.
	38	*/
	39	int blk_rq_count_integrity_sg(struct request *rq)
	40	{
	41	struct bio_vec iv, ivprv;
	42	struct req_iterator iter;
	43	unsigned int segments;
	44
	45	ivprv = NULL;
	46	segments = 0;
	47
	48	rq_for_each_integrity_segment(iv, rq, iter) {
	49
	50	if (!ivprv \|\| !BIOVEC_PHYS_MERGEABLE(ivprv, iv))
	51	segments++;
	52
	53	ivprv = iv;
	54	}
	55
	56	return segments;
	57	}
	58	EXPORT_SYMBOL(blk_rq_count_integrity_sg);
	59
	60	/**
	61	* blk_rq_map_integrity_sg - Map integrity metadata into a scatterlist
	62	* @rq: request with integrity metadata attached
	63	* @sglist: target scatterlist
	64	*
65	* Description: Map the integrity vectors in request into a
66	* scatterlist. The scatterlist must be big enough to hold all
67	* elements. I.e. sized using blk_rq_count_integrity_sg().
68	*/
69	int blk_rq_map_integrity_sg(struct request rq, struct scatterlist sglist)
70	{
71	struct bio_vec iv, ivprv;
72	struct req_iterator iter;
73	struct scatterlist *sg;
74	unsigned int segments;
75
76	ivprv = NULL;
77	sg = NULL;
78	segments = 0;
79
80	rq_for_each_integrity_segment(iv, rq, iter) {
81
82	if (ivprv) {
83	if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
84	goto new_segment;
85
86	sg->length += iv->bv_len;
87	} else {
88	new_segment:
89	if (!sg)
90	sg = sglist;
91	else {
92	sg->page_link &= ~0x02;
93	sg = sg_next(sg);
94	}
95
96	sg_set_page(sg, iv->bv_page, iv->bv_len, iv->bv_offset);
97	segments++;
98	}
99
100	ivprv = iv;
101	}
102
103	if (sg)
104	sg_mark_end(sg);
105
106	return segments;
107	}
108	EXPORT_SYMBOL(blk_rq_map_integrity_sg);
109
110	/**
ad7fce93 MP	111	* blk_integrity_compare - Compare integrity profile of two disks
	112	* @gd1: Disk to compare
	113	* @gd2: Disk to compare
7ba1ba12 MP	114	*
	115	* Description: Meta-devices like DM and MD need to verify that all
	116	* sub-devices use the same integrity format before advertising to
	117	* upper layers that they can send/receive integrity metadata. This
ad7fce93	118	* function can be used to check whether two gendisk devices have
7ba1ba12 MP	119	* compatible integrity formats.
7ba1ba12 MP	120	*/
ad7fce93	121	int blk_integrity_compare(struct gendisk gd1, struct gendisk gd2)
7ba1ba12	122	{
ad7fce93 MP	123	struct blk_integrity *b1 = gd1->integrity;
ad7fce93 MP	124	struct blk_integrity *b2 = gd2->integrity;
7ba1ba12	125
ad7fce93 MP	126	if (!b1 && !b2)
ad7fce93 MP	127	return 0;
7ba1ba12 MP	128
7ba1ba12 MP	129	if (!b1 \|\| !b2)
ad7fce93	130	return -1;
7ba1ba12 MP	131
	132	if (b1->sector_size != b2->sector_size) {
	133	printk(KERN_ERR "%s: %s/%s sector sz %u != %u\n", __func__,
ad7fce93	134	gd1->disk_name, gd2->disk_name,
7ba1ba12 MP	135	b1->sector_size, b2->sector_size);
	136	return -1;
	137	}
	138
	139	if (b1->tuple_size != b2->tuple_size) {
	140	printk(KERN_ERR "%s: %s/%s tuple sz %u != %u\n", __func__,
ad7fce93	141	gd1->disk_name, gd2->disk_name,
7ba1ba12 MP	142	b1->tuple_size, b2->tuple_size);
	143	return -1;
	144	}
	145
	146	if (b1->tag_size && b2->tag_size && (b1->tag_size != b2->tag_size)) {
	147	printk(KERN_ERR "%s: %s/%s tag sz %u != %u\n", __func__,
ad7fce93	148	gd1->disk_name, gd2->disk_name,
7ba1ba12 MP	149	b1->tag_size, b2->tag_size);
	150	return -1;
	151	}
	152
	153	if (strcmp(b1->name, b2->name)) {
	154	printk(KERN_ERR "%s: %s/%s type %s != %s\n", __func__,
ad7fce93	155	gd1->disk_name, gd2->disk_name,
7ba1ba12 MP	156	b1->name, b2->name);
	157	return -1;
	158	}
	159
	160	return 0;
	161	}
	162	EXPORT_SYMBOL(blk_integrity_compare);
	163
	164	struct integrity_sysfs_entry {
	165	struct attribute attr;
	166	ssize_t (show)(struct blk_integrity , char *);
	167	ssize_t (store)(struct blk_integrity , const char *, size_t);
	168	};
	169
	170	static ssize_t integrity_attr_show(struct kobject kobj, struct attribute attr,
	171	char *page)
	172	{
	173	struct blk_integrity *bi =
	174	container_of(kobj, struct blk_integrity, kobj);
	175	struct integrity_sysfs_entry *entry =
	176	container_of(attr, struct integrity_sysfs_entry, attr);
	177
	178	return entry->show(bi, page);
	179	}
	180
b984679e JA	181	static ssize_t integrity_attr_store(struct kobject *kobj,
	182	struct attribute attr, const char page,
	183	size_t count)
7ba1ba12 MP	184	{
	185	struct blk_integrity *bi =
	186	container_of(kobj, struct blk_integrity, kobj);
	187	struct integrity_sysfs_entry *entry =
	188	container_of(attr, struct integrity_sysfs_entry, attr);
	189	ssize_t ret = 0;
	190
	191	if (entry->store)
	192	ret = entry->store(bi, page, count);
	193
	194	return ret;
	195	}
	196
	197	static ssize_t integrity_format_show(struct blk_integrity bi, char page)
	198	{
	199	if (bi != NULL && bi->name != NULL)
	200	return sprintf(page, "%s\n", bi->name);
	201	else
	202	return sprintf(page, "none\n");
	203	}
	204
	205	static ssize_t integrity_tag_size_show(struct blk_integrity bi, char page)
	206	{
	207	if (bi != NULL)
	208	return sprintf(page, "%u\n", bi->tag_size);
	209	else
	210	return sprintf(page, "0\n");
	211	}
	212
	213	static ssize_t integrity_read_store(struct blk_integrity *bi,
	214	const char *page, size_t count)
	215	{
	216	char p = (char ) page;
	217	unsigned long val = simple_strtoul(p, &p, 10);
	218
	219	if (val)
b24498d4	220	bi->flags \|= INTEGRITY_FLAG_READ;
7ba1ba12	221	else
b24498d4	222	bi->flags &= ~INTEGRITY_FLAG_READ;
7ba1ba12 MP	223
	224	return count;
	225	}
	226
	227	static ssize_t integrity_read_show(struct blk_integrity bi, char page)
	228	{
b24498d4	229	return sprintf(page, "%d\n", (bi->flags & INTEGRITY_FLAG_READ) != 0);
7ba1ba12 MP	230	}
	231
	232	static ssize_t integrity_write_store(struct blk_integrity *bi,
	233	const char *page, size_t count)
	234	{
	235	char p = (char ) page;
	236	unsigned long val = simple_strtoul(p, &p, 10);
	237
	238	if (val)
b24498d4	239	bi->flags \|= INTEGRITY_FLAG_WRITE;
7ba1ba12	240	else
b24498d4	241	bi->flags &= ~INTEGRITY_FLAG_WRITE;
7ba1ba12 MP	242
	243	return count;
	244	}
	245
	246	static ssize_t integrity_write_show(struct blk_integrity bi, char page)
	247	{
b24498d4	248	return sprintf(page, "%d\n", (bi->flags & INTEGRITY_FLAG_WRITE) != 0);
7ba1ba12 MP	249	}
	250
	251	static struct integrity_sysfs_entry integrity_format_entry = {
	252	.attr = { .name = "format", .mode = S_IRUGO },
	253	.show = integrity_format_show,
	254	};
	255
	256	static struct integrity_sysfs_entry integrity_tag_size_entry = {
	257	.attr = { .name = "tag_size", .mode = S_IRUGO },
	258	.show = integrity_tag_size_show,
	259	};
	260
	261	static struct integrity_sysfs_entry integrity_read_entry = {
	262	.attr = { .name = "read_verify", .mode = S_IRUGO \| S_IWUSR },
	263	.show = integrity_read_show,
	264	.store = integrity_read_store,
	265	};
	266
	267	static struct integrity_sysfs_entry integrity_write_entry = {
	268	.attr = { .name = "write_generate", .mode = S_IRUGO \| S_IWUSR },
	269	.show = integrity_write_show,
	270	.store = integrity_write_store,
	271	};
	272
	273	static struct attribute *integrity_attrs[] = {
	274	&integrity_format_entry.attr,
	275	&integrity_tag_size_entry.attr,
	276	&integrity_read_entry.attr,
	277	&integrity_write_entry.attr,
	278	NULL,
	279	};
	280
	281	static struct sysfs_ops integrity_ops = {
	282	.show = &integrity_attr_show,
	283	.store = &integrity_attr_store,
	284	};
	285
	286	static int __init blk_dev_integrity_init(void)
	287	{
	288	integrity_cachep = kmem_cache_create("blkdev_integrity",
	289	sizeof(struct blk_integrity),
	290	0, SLAB_PANIC, NULL);
	291	return 0;
	292	}
	293	subsys_initcall(blk_dev_integrity_init);
	294
	295	static void blk_integrity_release(struct kobject *kobj)
	296	{
	297	struct blk_integrity *bi =
	298	container_of(kobj, struct blk_integrity, kobj);
	299
	300	kmem_cache_free(integrity_cachep, bi);
	301	}
	302
	303	static struct kobj_type integrity_ktype = {
	304	.default_attrs = integrity_attrs,
	305	.sysfs_ops = &integrity_ops,
	306	.release = blk_integrity_release,
	307	};
	308
	309	/**
	310	* blk_integrity_register - Register a gendisk as being integrity-capable
	311	* @disk: struct gendisk pointer to make integrity-aware
32231638	312	* @template: optional integrity profile to register
7ba1ba12 MP	313	*
	314	* Description: When a device needs to advertise itself as being able
	315	* to send/receive integrity metadata it must use this function to
	316	* register the capability with the block layer. The template is a
	317	* blk_integrity struct with values appropriate for the underlying
32231638 MP	318	* hardware. If template is NULL the new profile is allocated but
32231638 MP	319	* not filled out. See Documentation/block/data-integrity.txt.
7ba1ba12 MP	320	*/
	321	int blk_integrity_register(struct gendisk disk, struct blk_integrity template)
	322	{
	323	struct blk_integrity *bi;
	324
	325	BUG_ON(disk == NULL);
7ba1ba12 MP	326
7ba1ba12 MP	327	if (disk->integrity == NULL) {
b984679e	328	bi = kmem_cache_alloc(integrity_cachep,
32231638	329	GFP_KERNEL \| __GFP_ZERO);
7ba1ba12 MP	330	if (!bi)
	331	return -1;
	332
	333	if (kobject_init_and_add(&bi->kobj, &integrity_ktype,
ed9e1982 TH	334	&disk_to_dev(disk)->kobj,
ed9e1982 TH	335	"%s", "integrity")) {
7ba1ba12 MP	336	kmem_cache_free(integrity_cachep, bi);
	337	return -1;
	338	}
	339
	340	kobject_uevent(&bi->kobj, KOBJ_ADD);
	341
b24498d4	342	bi->flags \|= INTEGRITY_FLAG_READ \| INTEGRITY_FLAG_WRITE;
e1defc4f	343	bi->sector_size = queue_logical_block_size(disk->queue);
7ba1ba12 MP	344	disk->integrity = bi;
	345	} else
	346	bi = disk->integrity;
	347
	348	/* Use the provided profile as template */
32231638 MP	349	if (template != NULL) {
	350	bi->name = template->name;
	351	bi->generate_fn = template->generate_fn;
	352	bi->verify_fn = template->verify_fn;
	353	bi->tuple_size = template->tuple_size;
	354	bi->set_tag_fn = template->set_tag_fn;
	355	bi->get_tag_fn = template->get_tag_fn;
	356	bi->tag_size = template->tag_size;
	357	} else
	358	bi->name = "unsupported";
7ba1ba12 MP	359
	360	return 0;
	361	}
	362	EXPORT_SYMBOL(blk_integrity_register);
	363
	364	/**
	365	* blk_integrity_unregister - Remove block integrity profile
	366	* @disk: disk whose integrity profile to deallocate
	367	*
	368	* Description: This function frees all memory used by the block
	369	* integrity profile. To be called at device teardown.
	370	*/
	371	void blk_integrity_unregister(struct gendisk *disk)
	372	{
	373	struct blk_integrity *bi;
	374
	375	if (!disk \|\| !disk->integrity)
	376	return;
	377
	378	bi = disk->integrity;
	379
	380	kobject_uevent(&bi->kobj, KOBJ_REMOVE);
	381	kobject_del(&bi->kobj);
3839e4b2	382	kobject_put(&bi->kobj);
7ba1ba12	383	kmem_cache_free(integrity_cachep, bi);
0c032ab8	384	disk->integrity = NULL;
7ba1ba12 MP	385	}
7ba1ba12 MP	386	EXPORT_SYMBOL(blk_integrity_unregister);