Contributors: 27
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Martin K. Petersen |
1064 |
62.44% |
14 |
20.29% |
| Thomas Weißschuh |
223 |
13.09% |
4 |
5.80% |
| Jens Axboe |
146 |
8.57% |
9 |
13.04% |
| Dan J Williams |
41 |
2.41% |
2 |
2.90% |
| Kent Overstreet |
38 |
2.23% |
1 |
1.45% |
| Christoph Hellwig |
36 |
2.11% |
7 |
10.14% |
| Max Gurtovoy |
28 |
1.64% |
2 |
2.90% |
| Satya Tangirala |
23 |
1.35% |
1 |
1.45% |
| Andrew Morton |
16 |
0.94% |
4 |
5.80% |
| Linus Torvalds (pre-git) |
9 |
0.53% |
4 |
5.80% |
| Sagi Grimberg |
8 |
0.47% |
1 |
1.45% |
| Kanchan Joshi |
8 |
0.47% |
1 |
1.45% |
| Martin Schwidefsky |
8 |
0.47% |
1 |
1.45% |
| Vishal Verma |
8 |
0.47% |
1 |
1.45% |
| Eric Biggers |
6 |
0.35% |
3 |
4.35% |
| Al Viro |
6 |
0.35% |
2 |
2.90% |
| Mike Snitzer |
5 |
0.29% |
1 |
1.45% |
| Mike Sullivan |
4 |
0.23% |
1 |
1.45% |
| Ilya Dryomov |
4 |
0.23% |
1 |
1.45% |
| Lihong Kou |
4 |
0.23% |
1 |
1.45% |
| Patrick Mochel |
4 |
0.23% |
1 |
1.45% |
| Linus Torvalds |
3 |
0.18% |
2 |
2.90% |
| Paolo Bonzini |
3 |
0.18% |
1 |
1.45% |
| Dave Olien |
3 |
0.18% |
1 |
1.45% |
| Paul Gortmaker |
3 |
0.18% |
1 |
1.45% |
| Darrick J. Wong |
2 |
0.12% |
1 |
1.45% |
| Mauro Carvalho Chehab |
1 |
0.06% |
1 |
1.45% |
| Total |
1704 |
|
69 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* blk-integrity.c - Block layer data integrity extensions
*
* Copyright (C) 2007, 2008 Oracle Corporation
* Written by: Martin K. Petersen <martin.petersen@oracle.com>
*/
#include <linux/blk-integrity.h>
#include <linux/backing-dev.h>
#include <linux/mempool.h>
#include <linux/bio.h>
#include <linux/scatterlist.h>
#include <linux/export.h>
#include <linux/slab.h>
#include "blk.h"
/**
* blk_rq_count_integrity_sg - Count number of integrity scatterlist elements
* @q: request queue
* @bio: bio with integrity metadata attached
*
* Description: Returns the number of elements required in a
* scatterlist corresponding to the integrity metadata in a bio.
*/
int blk_rq_count_integrity_sg(struct request_queue *q, struct bio *bio)
{
struct bio_vec iv, ivprv = { NULL };
unsigned int segments = 0;
unsigned int seg_size = 0;
struct bvec_iter iter;
int prev = 0;
bio_for_each_integrity_vec(iv, bio, iter) {
if (prev) {
if (!biovec_phys_mergeable(q, &ivprv, &iv))
goto new_segment;
if (seg_size + iv.bv_len > queue_max_segment_size(q))
goto new_segment;
seg_size += iv.bv_len;
} else {
new_segment:
segments++;
seg_size = iv.bv_len;
}
prev = 1;
ivprv = iv;
}
return segments;
}
EXPORT_SYMBOL(blk_rq_count_integrity_sg);
/**
* blk_rq_map_integrity_sg - Map integrity metadata into a scatterlist
* @q: request queue
* @bio: bio 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_queue *q, struct bio *bio,
struct scatterlist *sglist)
{
struct bio_vec iv, ivprv = { NULL };
struct scatterlist *sg = NULL;
unsigned int segments = 0;
struct bvec_iter iter;
int prev = 0;
bio_for_each_integrity_vec(iv, bio, iter) {
if (prev) {
if (!biovec_phys_mergeable(q, &ivprv, &iv))
goto new_segment;
if (sg->length + iv.bv_len > queue_max_segment_size(q))
goto new_segment;
sg->length += iv.bv_len;
} else {
new_segment:
if (!sg)
sg = sglist;
else {
sg_unmark_end(sg);
sg = sg_next(sg);
}
sg_set_page(sg, iv.bv_page, iv.bv_len, iv.bv_offset);
segments++;
}
prev = 1;
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->queue->integrity;
struct blk_integrity *b2 = &gd2->queue->integrity;
if (!b1->profile && !b2->profile)
return 0;
if (!b1->profile || !b2->profile)
return -1;
if (b1->interval_exp != b2->interval_exp) {
pr_err("%s: %s/%s protection interval %u != %u\n",
__func__, gd1->disk_name, gd2->disk_name,
1 << b1->interval_exp, 1 << b2->interval_exp);
return -1;
}
if (b1->tuple_size != b2->tuple_size) {
pr_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)) {
pr_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 (b1->profile != b2->profile) {
pr_err("%s: %s/%s type %s != %s\n", __func__,
gd1->disk_name, gd2->disk_name,
b1->profile->name, b2->profile->name);
return -1;
}
return 0;
}
EXPORT_SYMBOL(blk_integrity_compare);
bool blk_integrity_merge_rq(struct request_queue *q, struct request *req,
struct request *next)
{
if (blk_integrity_rq(req) == 0 && blk_integrity_rq(next) == 0)
return true;
if (blk_integrity_rq(req) == 0 || blk_integrity_rq(next) == 0)
return false;
if (bio_integrity(req->bio)->bip_flags !=
bio_integrity(next->bio)->bip_flags)
return false;
if (req->nr_integrity_segments + next->nr_integrity_segments >
q->limits.max_integrity_segments)
return false;
if (integrity_req_gap_back_merge(req, next->bio))
return false;
return true;
}
bool blk_integrity_merge_bio(struct request_queue *q, struct request *req,
struct bio *bio)
{
int nr_integrity_segs;
struct bio *next = bio->bi_next;
if (blk_integrity_rq(req) == 0 && bio_integrity(bio) == NULL)
return true;
if (blk_integrity_rq(req) == 0 || bio_integrity(bio) == NULL)
return false;
if (bio_integrity(req->bio)->bip_flags != bio_integrity(bio)->bip_flags)
return false;
bio->bi_next = NULL;
nr_integrity_segs = blk_rq_count_integrity_sg(q, bio);
bio->bi_next = next;
if (req->nr_integrity_segments + nr_integrity_segs >
q->limits.max_integrity_segments)
return false;
req->nr_integrity_segments += nr_integrity_segs;
return true;
}
static inline struct blk_integrity *dev_to_bi(struct device *dev)
{
return &dev_to_disk(dev)->queue->integrity;
}
static ssize_t format_show(struct device *dev, struct device_attribute *attr,
char *page)
{
struct blk_integrity *bi = dev_to_bi(dev);
if (bi->profile && bi->profile->name)
return sysfs_emit(page, "%s\n", bi->profile->name);
return sysfs_emit(page, "none\n");
}
static ssize_t tag_size_show(struct device *dev, struct device_attribute *attr,
char *page)
{
struct blk_integrity *bi = dev_to_bi(dev);
return sysfs_emit(page, "%u\n", bi->tag_size);
}
static ssize_t protection_interval_bytes_show(struct device *dev,
struct device_attribute *attr,
char *page)
{
struct blk_integrity *bi = dev_to_bi(dev);
return sysfs_emit(page, "%u\n",
bi->interval_exp ? 1 << bi->interval_exp : 0);
}
static ssize_t read_verify_store(struct device *dev,
struct device_attribute *attr,
const char *page, size_t count)
{
struct blk_integrity *bi = dev_to_bi(dev);
char *p = (char *) page;
unsigned long val = simple_strtoul(p, &p, 10);
if (val)
bi->flags |= BLK_INTEGRITY_VERIFY;
else
bi->flags &= ~BLK_INTEGRITY_VERIFY;
return count;
}
static ssize_t read_verify_show(struct device *dev,
struct device_attribute *attr, char *page)
{
struct blk_integrity *bi = dev_to_bi(dev);
return sysfs_emit(page, "%d\n", !!(bi->flags & BLK_INTEGRITY_VERIFY));
}
static ssize_t write_generate_store(struct device *dev,
struct device_attribute *attr,
const char *page, size_t count)
{
struct blk_integrity *bi = dev_to_bi(dev);
char *p = (char *) page;
unsigned long val = simple_strtoul(p, &p, 10);
if (val)
bi->flags |= BLK_INTEGRITY_GENERATE;
else
bi->flags &= ~BLK_INTEGRITY_GENERATE;
return count;
}
static ssize_t write_generate_show(struct device *dev,
struct device_attribute *attr, char *page)
{
struct blk_integrity *bi = dev_to_bi(dev);
return sysfs_emit(page, "%d\n", !!(bi->flags & BLK_INTEGRITY_GENERATE));
}
static ssize_t device_is_integrity_capable_show(struct device *dev,
struct device_attribute *attr,
char *page)
{
struct blk_integrity *bi = dev_to_bi(dev);
return sysfs_emit(page, "%u\n",
!!(bi->flags & BLK_INTEGRITY_DEVICE_CAPABLE));
}
static DEVICE_ATTR_RO(format);
static DEVICE_ATTR_RO(tag_size);
static DEVICE_ATTR_RO(protection_interval_bytes);
static DEVICE_ATTR_RW(read_verify);
static DEVICE_ATTR_RW(write_generate);
static DEVICE_ATTR_RO(device_is_integrity_capable);
static struct attribute *integrity_attrs[] = {
&dev_attr_format.attr,
&dev_attr_tag_size.attr,
&dev_attr_protection_interval_bytes.attr,
&dev_attr_read_verify.attr,
&dev_attr_write_generate.attr,
&dev_attr_device_is_integrity_capable.attr,
NULL
};
const struct attribute_group blk_integrity_attr_group = {
.name = "integrity",
.attrs = integrity_attrs,
};
static blk_status_t blk_integrity_nop_fn(struct blk_integrity_iter *iter)
{
return BLK_STS_OK;
}
static void blk_integrity_nop_prepare(struct request *rq)
{
}
static void blk_integrity_nop_complete(struct request *rq,
unsigned int nr_bytes)
{
}
static const struct blk_integrity_profile nop_profile = {
.name = "nop",
.generate_fn = blk_integrity_nop_fn,
.verify_fn = blk_integrity_nop_fn,
.prepare_fn = blk_integrity_nop_prepare,
.complete_fn = blk_integrity_nop_complete,
};
/**
* blk_integrity_register - Register a gendisk as being integrity-capable
* @disk: struct gendisk pointer to make integrity-aware
* @template: block 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. See
* Documentation/block/data-integrity.rst.
*/
void blk_integrity_register(struct gendisk *disk, struct blk_integrity *template)
{
struct blk_integrity *bi = &disk->queue->integrity;
bi->flags = BLK_INTEGRITY_VERIFY | BLK_INTEGRITY_GENERATE |
template->flags;
bi->interval_exp = template->interval_exp ? :
ilog2(queue_logical_block_size(disk->queue));
bi->profile = template->profile ? template->profile : &nop_profile;
bi->tuple_size = template->tuple_size;
bi->tag_size = template->tag_size;
bi->pi_offset = template->pi_offset;
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, disk->queue);
#ifdef CONFIG_BLK_INLINE_ENCRYPTION
if (disk->queue->crypto_profile) {
pr_warn("blk-integrity: Integrity and hardware inline encryption are not supported together. Disabling hardware inline encryption.\n");
disk->queue->crypto_profile = NULL;
}
#endif
}
EXPORT_SYMBOL(blk_integrity_register);
/**
* blk_integrity_unregister - Unregister block integrity profile
* @disk: disk whose integrity profile to unregister
*
* Description: This function unregisters the integrity capability from
* a block device.
*/
void blk_integrity_unregister(struct gendisk *disk)
{
struct blk_integrity *bi = &disk->queue->integrity;
if (!bi->profile)
return;
/* ensure all bios are off the integrity workqueue */
blk_flush_integrity();
blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, disk->queue);
memset(bi, 0, sizeof(*bi));
}
EXPORT_SYMBOL(blk_integrity_unregister);