block: Block layer data integrity support
Some block devices support verifying the integrity of requests by way of checksums or other protection information that is submitted along with the I/O. This patch implements support for generating and verifying integrity metadata, as well as correctly merging, splitting and cloning bios and requests that have this extra information attached. See Documentation/block/data-integrity.txt for more information. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Martin K. Petersen
Jens Axboe
Родитель
51d654e1d8
Коммит
7ba1ba12ee
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@ -81,6 +81,18 @@ config BLK_DEV_BSG
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If unsure, say N.
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config BLK_DEV_INTEGRITY
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bool "Block layer data integrity support"
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---help---
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Some storage devices allow extra information to be
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stored/retrieved to help protect the data. The block layer
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data integrity option provides hooks which can be used by
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filesystems to ensure better data integrity.
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Say yes here if you have a storage device that provides the
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T10/SCSI Data Integrity Field or the T13/ATA External Path
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Protection. If in doubt, say N.
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endif # BLOCK
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config BLOCK_COMPAT
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@ -14,3 +14,4 @@ obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o
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obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
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obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o
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obj-$(CONFIG_BLK_DEV_INTEGRITY) += blk-integrity.o
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@ -143,6 +143,10 @@ static void req_bio_endio(struct request *rq, struct bio *bio,
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bio->bi_size -= nbytes;
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bio->bi_sector += (nbytes >> 9);
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if (bio_integrity(bio))
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bio_integrity_advance(bio, nbytes);
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if (bio->bi_size == 0)
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bio_endio(bio, error);
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} else {
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@ -1381,6 +1385,9 @@ end_io:
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*/
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blk_partition_remap(bio);
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if (bio_integrity_enabled(bio) && bio_integrity_prep(bio))
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goto end_io;
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if (old_sector != -1)
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blk_add_trace_remap(q, bio, old_dev, bio->bi_sector,
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old_sector);
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@ -0,0 +1,382 @@
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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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#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 "blk.h"
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static struct kmem_cache *integrity_cachep;
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/**
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* blk_rq_count_integrity_sg - Count number of integrity scatterlist elements
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* @rq: request 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 request.
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*/
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int blk_rq_count_integrity_sg(struct request *rq)
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{
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struct bio_vec *iv, *ivprv;
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struct req_iterator iter;
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unsigned int segments;
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ivprv = NULL;
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segments = 0;
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rq_for_each_integrity_segment(iv, rq, iter) {
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if (!ivprv || !BIOVEC_PHYS_MERGEABLE(ivprv, iv))
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segments++;
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ivprv = iv;
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}
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return segments;
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}
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EXPORT_SYMBOL(blk_rq_count_integrity_sg);
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/**
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* blk_rq_map_integrity_sg - Map integrity metadata into a scatterlist
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* @rq: request with integrity metadata attached
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* @sglist: target scatterlist
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*
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* Description: Map the integrity vectors in request into a
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* scatterlist. The scatterlist must be big enough to hold all
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* elements. I.e. sized using blk_rq_count_integrity_sg().
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*/
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int blk_rq_map_integrity_sg(struct request *rq, struct scatterlist *sglist)
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{
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struct bio_vec *iv, *ivprv;
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struct req_iterator iter;
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struct scatterlist *sg;
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unsigned int segments;
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ivprv = NULL;
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sg = NULL;
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segments = 0;
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rq_for_each_integrity_segment(iv, rq, iter) {
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if (ivprv) {
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if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
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goto new_segment;
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sg->length += iv->bv_len;
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} else {
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new_segment:
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if (!sg)
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sg = sglist;
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else {
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sg->page_link &= ~0x02;
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sg = sg_next(sg);
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}
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sg_set_page(sg, iv->bv_page, iv->bv_len, iv->bv_offset);
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segments++;
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}
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ivprv = iv;
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}
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if (sg)
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sg_mark_end(sg);
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return segments;
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}
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EXPORT_SYMBOL(blk_rq_map_integrity_sg);
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/**
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* blk_integrity_compare - Compare integrity profile of two block devices
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* @b1: Device to compare
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* @b2: Device to compare
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*
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* Description: Meta-devices like DM and MD need to verify that all
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* sub-devices use the same integrity format before advertising to
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* upper layers that they can send/receive integrity metadata. This
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* function can be used to check whether two block devices have
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* compatible integrity formats.
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*/
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int blk_integrity_compare(struct block_device *bd1, struct block_device *bd2)
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{
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struct blk_integrity *b1 = bd1->bd_disk->integrity;
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struct blk_integrity *b2 = bd2->bd_disk->integrity;
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BUG_ON(bd1->bd_disk == NULL);
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BUG_ON(bd2->bd_disk == NULL);
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if (!b1 || !b2)
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return 0;
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if (b1->sector_size != b2->sector_size) {
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printk(KERN_ERR "%s: %s/%s sector sz %u != %u\n", __func__,
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bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
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b1->sector_size, b2->sector_size);
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return -1;
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}
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if (b1->tuple_size != b2->tuple_size) {
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printk(KERN_ERR "%s: %s/%s tuple sz %u != %u\n", __func__,
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bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
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b1->tuple_size, b2->tuple_size);
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return -1;
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}
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if (b1->tag_size && b2->tag_size && (b1->tag_size != b2->tag_size)) {
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printk(KERN_ERR "%s: %s/%s tag sz %u != %u\n", __func__,
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bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
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b1->tag_size, b2->tag_size);
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return -1;
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}
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if (strcmp(b1->name, b2->name)) {
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printk(KERN_ERR "%s: %s/%s type %s != %s\n", __func__,
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bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
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b1->name, b2->name);
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return -1;
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}
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return 0;
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}
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EXPORT_SYMBOL(blk_integrity_compare);
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struct integrity_sysfs_entry {
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struct attribute attr;
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ssize_t (*show)(struct blk_integrity *, char *);
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ssize_t (*store)(struct blk_integrity *, const char *, size_t);
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};
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static ssize_t integrity_attr_show(struct kobject *kobj, struct attribute *attr,
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char *page)
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{
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struct blk_integrity *bi =
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container_of(kobj, struct blk_integrity, kobj);
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struct integrity_sysfs_entry *entry =
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container_of(attr, struct integrity_sysfs_entry, attr);
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return entry->show(bi, page);
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}
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static ssize_t integrity_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *page, size_t count)
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{
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struct blk_integrity *bi =
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container_of(kobj, struct blk_integrity, kobj);
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struct integrity_sysfs_entry *entry =
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container_of(attr, struct integrity_sysfs_entry, attr);
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ssize_t ret = 0;
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if (entry->store)
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ret = entry->store(bi, page, count);
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return ret;
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}
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static ssize_t integrity_format_show(struct blk_integrity *bi, char *page)
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{
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if (bi != NULL && bi->name != NULL)
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return sprintf(page, "%s\n", bi->name);
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else
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return sprintf(page, "none\n");
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}
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static ssize_t integrity_tag_size_show(struct blk_integrity *bi, char *page)
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{
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if (bi != NULL)
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return sprintf(page, "%u\n", bi->tag_size);
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else
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return sprintf(page, "0\n");
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}
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static ssize_t integrity_read_store(struct blk_integrity *bi,
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const char *page, size_t count)
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{
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char *p = (char *) page;
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unsigned long val = simple_strtoul(p, &p, 10);
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if (val)
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set_bit(INTEGRITY_FLAG_READ, &bi->flags);
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else
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clear_bit(INTEGRITY_FLAG_READ, &bi->flags);
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return count;
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}
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static ssize_t integrity_read_show(struct blk_integrity *bi, char *page)
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{
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return sprintf(page, "%d\n",
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test_bit(INTEGRITY_FLAG_READ, &bi->flags) ? 1 : 0);
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}
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static ssize_t integrity_write_store(struct blk_integrity *bi,
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const char *page, size_t count)
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{
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char *p = (char *) page;
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unsigned long val = simple_strtoul(p, &p, 10);
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if (val)
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set_bit(INTEGRITY_FLAG_WRITE, &bi->flags);
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else
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clear_bit(INTEGRITY_FLAG_WRITE, &bi->flags);
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return count;
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}
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static ssize_t integrity_write_show(struct blk_integrity *bi, char *page)
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{
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return sprintf(page, "%d\n",
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test_bit(INTEGRITY_FLAG_WRITE, &bi->flags) ? 1 : 0);
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}
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static struct integrity_sysfs_entry integrity_format_entry = {
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.attr = { .name = "format", .mode = S_IRUGO },
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.show = integrity_format_show,
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};
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static struct integrity_sysfs_entry integrity_tag_size_entry = {
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.attr = { .name = "tag_size", .mode = S_IRUGO },
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.show = integrity_tag_size_show,
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};
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static struct integrity_sysfs_entry integrity_read_entry = {
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.attr = { .name = "read_verify", .mode = S_IRUGO | S_IWUSR },
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.show = integrity_read_show,
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.store = integrity_read_store,
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};
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static struct integrity_sysfs_entry integrity_write_entry = {
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.attr = { .name = "write_generate", .mode = S_IRUGO | S_IWUSR },
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.show = integrity_write_show,
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.store = integrity_write_store,
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};
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static struct attribute *integrity_attrs[] = {
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&integrity_format_entry.attr,
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&integrity_tag_size_entry.attr,
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&integrity_read_entry.attr,
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&integrity_write_entry.attr,
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NULL,
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};
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static struct sysfs_ops integrity_ops = {
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.show = &integrity_attr_show,
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.store = &integrity_attr_store,
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};
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static int __init blk_dev_integrity_init(void)
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{
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integrity_cachep = kmem_cache_create("blkdev_integrity",
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sizeof(struct blk_integrity),
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0, SLAB_PANIC, NULL);
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return 0;
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}
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subsys_initcall(blk_dev_integrity_init);
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static void blk_integrity_release(struct kobject *kobj)
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{
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struct blk_integrity *bi =
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container_of(kobj, struct blk_integrity, kobj);
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kmem_cache_free(integrity_cachep, bi);
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}
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static struct kobj_type integrity_ktype = {
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.default_attrs = integrity_attrs,
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.sysfs_ops = &integrity_ops,
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.release = blk_integrity_release,
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};
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/**
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* blk_integrity_register - Register a gendisk as being integrity-capable
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* @disk: struct gendisk pointer to make integrity-aware
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* @template: integrity profile
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*
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* Description: When a device needs to advertise itself as being able
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* to send/receive integrity metadata it must use this function to
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* register the capability with the block layer. The template is a
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* blk_integrity struct with values appropriate for the underlying
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* hardware. See Documentation/block/data-integrity.txt.
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*/
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int blk_integrity_register(struct gendisk *disk, struct blk_integrity *template)
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{
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struct blk_integrity *bi;
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BUG_ON(disk == NULL);
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BUG_ON(template == NULL);
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if (disk->integrity == NULL) {
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bi = kmem_cache_alloc(integrity_cachep, GFP_KERNEL | __GFP_ZERO);
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if (!bi)
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return -1;
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if (kobject_init_and_add(&bi->kobj, &integrity_ktype,
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&disk->dev.kobj, "%s", "integrity")) {
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kmem_cache_free(integrity_cachep, bi);
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return -1;
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}
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kobject_uevent(&bi->kobj, KOBJ_ADD);
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set_bit(INTEGRITY_FLAG_READ, &bi->flags);
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set_bit(INTEGRITY_FLAG_WRITE, &bi->flags);
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bi->sector_size = disk->queue->hardsect_size;
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disk->integrity = bi;
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} else
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bi = disk->integrity;
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/* Use the provided profile as template */
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bi->name = template->name;
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bi->generate_fn = template->generate_fn;
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bi->verify_fn = template->verify_fn;
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bi->tuple_size = template->tuple_size;
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bi->set_tag_fn = template->set_tag_fn;
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bi->get_tag_fn = template->get_tag_fn;
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bi->tag_size = template->tag_size;
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return 0;
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}
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EXPORT_SYMBOL(blk_integrity_register);
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/**
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* blk_integrity_unregister - Remove block integrity profile
|
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* @disk: disk whose integrity profile to deallocate
|
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*
|
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* Description: This function frees all memory used by the block
|
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* integrity profile. To be called at device teardown.
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*/
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void blk_integrity_unregister(struct gendisk *disk)
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{
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struct blk_integrity *bi;
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if (!disk || !disk->integrity)
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return;
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bi = disk->integrity;
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kobject_uevent(&bi->kobj, KOBJ_REMOVE);
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kobject_del(&bi->kobj);
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kobject_put(&disk->dev.kobj);
|
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kmem_cache_free(integrity_cachep, bi);
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}
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EXPORT_SYMBOL(blk_integrity_unregister);
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|
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@ -441,6 +441,9 @@ static int attempt_merge(struct request_queue *q, struct request *req,
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|| next->special)
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return 0;
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if (blk_integrity_rq(req) != blk_integrity_rq(next))
|
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return 0;
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|
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/*
|
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* If we are allowed to merge, then append bio list
|
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* from next to rq and release next. merge_requests_fn
|
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|
|
|
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|
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@ -51,4 +51,12 @@ static inline int queue_congestion_off_threshold(struct request_queue *q)
|
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return q->nr_congestion_off;
|
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}
|
||||
|
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
||||
|
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#define rq_for_each_integrity_segment(bvl, _rq, _iter) \
|
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__rq_for_each_bio(_iter.bio, _rq) \
|
||||
bip_for_each_vec(bvl, _iter.bio->bi_integrity, _iter.i)
|
||||
|
||||
#endif /* BLK_DEV_INTEGRITY */
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -86,6 +86,12 @@ int elv_rq_merge_ok(struct request *rq, struct bio *bio)
|
|||
if (rq->rq_disk != bio->bi_bdev->bd_disk || rq->special)
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* only merge integrity protected bio into ditto rq
|
||||
*/
|
||||
if (bio_integrity(bio) != blk_integrity_rq(rq))
|
||||
return 0;
|
||||
|
||||
if (!elv_iosched_allow_merge(rq, bio))
|
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return 0;
|
||||
|
||||
|
|
|
|||
|
|
@ -19,6 +19,7 @@ else
|
|||
obj-y += no-block.o
|
||||
endif
|
||||
|
||||
obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o
|
||||
obj-$(CONFIG_INOTIFY) += inotify.o
|
||||
obj-$(CONFIG_INOTIFY_USER) += inotify_user.o
|
||||
obj-$(CONFIG_EPOLL) += eventpoll.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,708 @@
|
|||
/*
|
||||
* bio-integrity.c - bio data integrity extensions
|
||||
*
|
||||
* Copyright (C) 2007, 2008 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/bio.h>
|
||||
#include <linux/workqueue.h>
|
||||
|
||||
static struct kmem_cache *bio_integrity_slab __read_mostly;
|
||||
static struct workqueue_struct *kintegrityd_wq;
|
||||
|
||||
/**
|
||||
* bio_integrity_alloc_bioset - 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
|
||||
* @bs: bio_set to allocate from
|
||||
*
|
||||
* 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_bioset(struct bio *bio, gfp_t gfp_mask, unsigned int nr_vecs, struct bio_set *bs)
|
||||
{
|
||||
struct bio_integrity_payload *bip;
|
||||
struct bio_vec *iv;
|
||||
unsigned long idx;
|
||||
|
||||
BUG_ON(bio == NULL);
|
||||
|
||||
bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask);
|
||||
if (unlikely(bip == NULL)) {
|
||||
printk(KERN_ERR "%s: could not alloc bip\n", __func__);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
memset(bip, 0, sizeof(*bip));
|
||||
|
||||
iv = bvec_alloc_bs(gfp_mask, nr_vecs, &idx, bs);
|
||||
if (unlikely(iv == NULL)) {
|
||||
printk(KERN_ERR "%s: could not alloc bip_vec\n", __func__);
|
||||
mempool_free(bip, bs->bio_integrity_pool);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
bip->bip_pool = idx;
|
||||
bip->bip_vec = iv;
|
||||
bip->bip_bio = bio;
|
||||
bio->bi_integrity = bip;
|
||||
|
||||
return bip;
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_alloc_bioset);
|
||||
|
||||
/**
|
||||
* 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)
|
||||
{
|
||||
return bio_integrity_alloc_bioset(bio, gfp_mask, nr_vecs, fs_bio_set);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_alloc);
|
||||
|
||||
/**
|
||||
* bio_integrity_free - Free bio integrity payload
|
||||
* @bio: bio containing bip to be freed
|
||||
* @bs: bio_set this bio was allocated from
|
||||
*
|
||||
* Description: Used to free the integrity portion of a bio. Usually
|
||||
* called from bio_free().
|
||||
*/
|
||||
void bio_integrity_free(struct bio *bio, struct bio_set *bs)
|
||||
{
|
||||
struct bio_integrity_payload *bip = bio->bi_integrity;
|
||||
|
||||
BUG_ON(bip == NULL);
|
||||
|
||||
/* A cloned bio doesn't own the integrity metadata */
|
||||
if (!bio_flagged(bio, BIO_CLONED) && bip->bip_buf != NULL)
|
||||
kfree(bip->bip_buf);
|
||||
|
||||
mempool_free(bip->bip_vec, bs->bvec_pools[bip->bip_pool]);
|
||||
mempool_free(bip, bs->bio_integrity_pool);
|
||||
|
||||
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->bi_integrity;
|
||||
struct bio_vec *iv;
|
||||
|
||||
if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_pool)) {
|
||||
printk(KERN_ERR "%s: bip_vec full\n", __func__);
|
||||
return 0;
|
||||
}
|
||||
|
||||
iv = bip_vec_idx(bip, bip->bip_vcnt);
|
||||
BUG_ON(iv == NULL);
|
||||
BUG_ON(iv->bv_page != NULL);
|
||||
|
||||
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.
|
||||
*/
|
||||
int bio_integrity_enabled(struct bio *bio)
|
||||
{
|
||||
/* Already protected? */
|
||||
if (bio_integrity(bio))
|
||||
return 0;
|
||||
|
||||
return bdev_integrity_enabled(bio->bi_bdev, bio_data_dir(bio));
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_enabled);
|
||||
|
||||
/**
|
||||
* bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto
|
||||
* @bi: blk_integrity profile for device
|
||||
* @sectors: Number of 512 sectors to convert
|
||||
*
|
||||
* Description: The block layer calculates everything in 512 byte
|
||||
* sectors but integrity metadata is done in terms of the hardware
|
||||
* sector size of the storage device. Convert the block layer sectors
|
||||
* to physical sectors.
|
||||
*/
|
||||
static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, unsigned int sectors)
|
||||
{
|
||||
/* At this point there are only 512b or 4096b DIF/EPP devices */
|
||||
if (bi->sector_size == 4096)
|
||||
return sectors >>= 3;
|
||||
|
||||
return sectors;
|
||||
}
|
||||
|
||||
/**
|
||||
* bio_integrity_tag_size - Retrieve integrity tag space
|
||||
* @bio: bio to inspect
|
||||
*
|
||||
* Description: Returns the maximum number of tag bytes that can be
|
||||
* attached to this bio. Filesystems can use this to determine how
|
||||
* much metadata to attach to an I/O.
|
||||
*/
|
||||
unsigned int bio_integrity_tag_size(struct bio *bio)
|
||||
{
|
||||
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
||||
|
||||
BUG_ON(bio->bi_size == 0);
|
||||
|
||||
return bi->tag_size * (bio->bi_size / bi->sector_size);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_tag_size);
|
||||
|
||||
int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, int set)
|
||||
{
|
||||
struct bio_integrity_payload *bip = bio->bi_integrity;
|
||||
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
||||
unsigned int nr_sectors;
|
||||
|
||||
BUG_ON(bip->bip_buf == NULL);
|
||||
|
||||
if (bi->tag_size == 0)
|
||||
return -1;
|
||||
|
||||
nr_sectors = bio_integrity_hw_sectors(bi, DIV_ROUND_UP(len, bi->tag_size));
|
||||
|
||||
if (nr_sectors * bi->tuple_size > bip->bip_size) {
|
||||
printk(KERN_ERR "%s: tag too big for bio: %u > %u\n",
|
||||
__func__, nr_sectors * bi->tuple_size, bip->bip_size);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (set)
|
||||
bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors);
|
||||
else
|
||||
bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* bio_integrity_set_tag - Attach a tag buffer to a bio
|
||||
* @bio: bio to attach buffer to
|
||||
* @tag_buf: Pointer to a buffer containing tag data
|
||||
* @len: Length of the included buffer
|
||||
*
|
||||
* Description: Use this function to tag a bio by leveraging the extra
|
||||
* space provided by devices formatted with integrity protection. The
|
||||
* size of the integrity buffer must be <= to the size reported by
|
||||
* bio_integrity_tag_size().
|
||||
*/
|
||||
int bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len)
|
||||
{
|
||||
BUG_ON(bio_data_dir(bio) != WRITE);
|
||||
|
||||
return bio_integrity_tag(bio, tag_buf, len, 1);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_set_tag);
|
||||
|
||||
/**
|
||||
* bio_integrity_get_tag - Retrieve a tag buffer from a bio
|
||||
* @bio: bio to retrieve buffer from
|
||||
* @tag_buf: Pointer to a buffer for the tag data
|
||||
* @len: Length of the target buffer
|
||||
*
|
||||
* Description: Use this function to retrieve the tag buffer from a
|
||||
* completed I/O. The size of the integrity buffer must be <= to the
|
||||
* size reported by bio_integrity_tag_size().
|
||||
*/
|
||||
int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len)
|
||||
{
|
||||
BUG_ON(bio_data_dir(bio) != READ);
|
||||
|
||||
return bio_integrity_tag(bio, tag_buf, len, 0);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_get_tag);
|
||||
|
||||
/**
|
||||
* bio_integrity_generate - Generate integrity metadata for a bio
|
||||
* @bio: bio to generate integrity metadata for
|
||||
*
|
||||
* Description: Generates integrity metadata for a bio by calling the
|
||||
* block device's generation callback function. The bio must have a
|
||||
* bip attached with enough room to accommodate the generated
|
||||
* integrity metadata.
|
||||
*/
|
||||
static void bio_integrity_generate(struct bio *bio)
|
||||
{
|
||||
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
||||
struct blk_integrity_exchg bix;
|
||||
struct bio_vec *bv;
|
||||
sector_t sector = bio->bi_sector;
|
||||
unsigned int i, sectors, total;
|
||||
void *prot_buf = bio->bi_integrity->bip_buf;
|
||||
|
||||
total = 0;
|
||||
bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
|
||||
bix.sector_size = bi->sector_size;
|
||||
|
||||
bio_for_each_segment(bv, bio, i) {
|
||||
void *kaddr = kmap_atomic(bv->bv_page, KM_USER0);
|
||||
bix.data_buf = kaddr + bv->bv_offset;
|
||||
bix.data_size = bv->bv_len;
|
||||
bix.prot_buf = prot_buf;
|
||||
bix.sector = sector;
|
||||
|
||||
bi->generate_fn(&bix);
|
||||
|
||||
sectors = bv->bv_len / bi->sector_size;
|
||||
sector += sectors;
|
||||
prot_buf += sectors * bi->tuple_size;
|
||||
total += sectors * bi->tuple_size;
|
||||
BUG_ON(total > bio->bi_integrity->bip_size);
|
||||
|
||||
kunmap_atomic(kaddr, KM_USER0);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 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 sectors;
|
||||
|
||||
bi = bdev_get_integrity(bio->bi_bdev);
|
||||
q = bdev_get_queue(bio->bi_bdev);
|
||||
BUG_ON(bi == NULL);
|
||||
BUG_ON(bio_integrity(bio));
|
||||
|
||||
sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio));
|
||||
|
||||
/* Allocate kernel buffer for protection data */
|
||||
len = sectors * blk_integrity_tuple_size(bi);
|
||||
buf = kmalloc(len, GFP_NOIO | __GFP_NOFAIL | q->bounce_gfp);
|
||||
if (unlikely(buf == NULL)) {
|
||||
printk(KERN_ERR "could not allocate integrity buffer\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
||||
start = ((unsigned long) buf) >> PAGE_SHIFT;
|
||||
nr_pages = end - start;
|
||||
|
||||
/* Allocate bio integrity payload and integrity vectors */
|
||||
bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages);
|
||||
if (unlikely(bip == NULL)) {
|
||||
printk(KERN_ERR "could not allocate data integrity bioset\n");
|
||||
kfree(buf);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
bip->bip_buf = buf;
|
||||
bip->bip_size = len;
|
||||
bip->bip_sector = bio->bi_sector;
|
||||
|
||||
/* Map it */
|
||||
offset = offset_in_page(buf);
|
||||
for (i = 0 ; i < nr_pages ; i++) {
|
||||
int ret;
|
||||
bytes = PAGE_SIZE - offset;
|
||||
|
||||
if (len <= 0)
|
||||
break;
|
||||
|
||||
if (bytes > len)
|
||||
bytes = len;
|
||||
|
||||
ret = bio_integrity_add_page(bio, virt_to_page(buf),
|
||||
bytes, offset);
|
||||
|
||||
if (ret == 0)
|
||||
return 0;
|
||||
|
||||
if (ret < bytes)
|
||||
break;
|
||||
|
||||
buf += bytes;
|
||||
len -= bytes;
|
||||
offset = 0;
|
||||
}
|
||||
|
||||
/* Install custom I/O completion handler if read verify is enabled */
|
||||
if (bio_data_dir(bio) == READ) {
|
||||
bip->bip_end_io = bio->bi_end_io;
|
||||
bio->bi_end_io = bio_integrity_endio;
|
||||
}
|
||||
|
||||
/* Auto-generate integrity metadata if this is a write */
|
||||
if (bio_data_dir(bio) == WRITE)
|
||||
bio_integrity_generate(bio);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_prep);
|
||||
|
||||
/**
|
||||
* bio_integrity_verify - Verify integrity metadata for a bio
|
||||
* @bio: bio to verify
|
||||
*
|
||||
* Description: This function is called to verify the integrity of a
|
||||
* bio. The data in the bio io_vec is compared to the integrity
|
||||
* metadata returned by the HBA.
|
||||
*/
|
||||
static int bio_integrity_verify(struct bio *bio)
|
||||
{
|
||||
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
||||
struct blk_integrity_exchg bix;
|
||||
struct bio_vec *bv;
|
||||
sector_t sector = bio->bi_integrity->bip_sector;
|
||||
unsigned int i, sectors, total, ret;
|
||||
void *prot_buf = bio->bi_integrity->bip_buf;
|
||||
|
||||
ret = total = 0;
|
||||
bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
|
||||
bix.sector_size = bi->sector_size;
|
||||
|
||||
bio_for_each_segment(bv, bio, i) {
|
||||
void *kaddr = kmap_atomic(bv->bv_page, KM_USER0);
|
||||
bix.data_buf = kaddr + bv->bv_offset;
|
||||
bix.data_size = bv->bv_len;
|
||||
bix.prot_buf = prot_buf;
|
||||
bix.sector = sector;
|
||||
|
||||
ret = bi->verify_fn(&bix);
|
||||
|
||||
if (ret) {
|
||||
kunmap_atomic(kaddr, KM_USER0);
|
||||
break;
|
||||
}
|
||||
|
||||
sectors = bv->bv_len / bi->sector_size;
|
||||
sector += sectors;
|
||||
prot_buf += sectors * bi->tuple_size;
|
||||
total += sectors * bi->tuple_size;
|
||||
BUG_ON(total > bio->bi_integrity->bip_size);
|
||||
|
||||
kunmap_atomic(kaddr, KM_USER0);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* bio_integrity_verify_fn - Integrity I/O completion worker
|
||||
* @work: Work struct stored in bio to be verified
|
||||
*
|
||||
* Description: This workqueue function is called to complete a READ
|
||||
* request. The function verifies the transferred integrity metadata
|
||||
* and then calls the original bio end_io function.
|
||||
*/
|
||||
static void bio_integrity_verify_fn(struct work_struct *work)
|
||||
{
|
||||
struct bio_integrity_payload *bip =
|
||||
container_of(work, struct bio_integrity_payload, bip_work);
|
||||
struct bio *bio = bip->bip_bio;
|
||||
int error = bip->bip_error;
|
||||
|
||||
if (bio_integrity_verify(bio)) {
|
||||
clear_bit(BIO_UPTODATE, &bio->bi_flags);
|
||||
error = -EIO;
|
||||
}
|
||||
|
||||
/* Restore original bio completion handler */
|
||||
bio->bi_end_io = bip->bip_end_io;
|
||||
|
||||
if (bio->bi_end_io)
|
||||
bio->bi_end_io(bio, error);
|
||||
}
|
||||
|
||||
/**
|
||||
* bio_integrity_endio - Integrity I/O completion function
|
||||
* @bio: Protected bio
|
||||
* @error: Pointer to errno
|
||||
*
|
||||
* Description: Completion for integrity I/O
|
||||
*
|
||||
* Normally I/O completion is done in interrupt context. However,
|
||||
* verifying I/O integrity is a time-consuming task which must be run
|
||||
* in process context. This function postpones completion
|
||||
* accordingly.
|
||||
*/
|
||||
void bio_integrity_endio(struct bio *bio, int error)
|
||||
{
|
||||
struct bio_integrity_payload *bip = bio->bi_integrity;
|
||||
|
||||
BUG_ON(bip->bip_bio != bio);
|
||||
|
||||
bip->bip_error = error;
|
||||
INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
|
||||
queue_work(kintegrityd_wq, &bip->bip_work);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_endio);
|
||||
|
||||
/**
|
||||
* bio_integrity_mark_head - Advance bip_vec skip bytes
|
||||
* @bip: Integrity vector to advance
|
||||
* @skip: Number of bytes to advance it
|
||||
*/
|
||||
void bio_integrity_mark_head(struct bio_integrity_payload *bip, unsigned int skip)
|
||||
{
|
||||
struct bio_vec *iv;
|
||||
unsigned int i;
|
||||
|
||||
bip_for_each_vec(iv, bip, i) {
|
||||
if (skip == 0) {
|
||||
bip->bip_idx = i;
|
||||
return;
|
||||
} else if (skip >= iv->bv_len) {
|
||||
skip -= iv->bv_len;
|
||||
} else { /* skip < iv->bv_len) */
|
||||
iv->bv_offset += skip;
|
||||
iv->bv_len -= skip;
|
||||
bip->bip_idx = i;
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* bio_integrity_mark_tail - Truncate bip_vec to be len bytes long
|
||||
* @bip: Integrity vector to truncate
|
||||
* @len: New length of integrity vector
|
||||
*/
|
||||
void bio_integrity_mark_tail(struct bio_integrity_payload *bip, unsigned int len)
|
||||
{
|
||||
struct bio_vec *iv;
|
||||
unsigned int i;
|
||||
|
||||
bip_for_each_vec(iv, bip, i) {
|
||||
if (len == 0) {
|
||||
bip->bip_vcnt = i;
|
||||
return;
|
||||
} else if (len >= iv->bv_len) {
|
||||
len -= iv->bv_len;
|
||||
} else { /* len < iv->bv_len) */
|
||||
iv->bv_len = len;
|
||||
len = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* bio_integrity_advance - Advance integrity vector
|
||||
* @bio: bio whose integrity vector to update
|
||||
* @bytes_done: number of data bytes that have been completed
|
||||
*
|
||||
* Description: This function calculates how many integrity bytes the
|
||||
* number of completed data bytes correspond to and advances the
|
||||
* integrity vector accordingly.
|
||||
*/
|
||||
void bio_integrity_advance(struct bio *bio, unsigned int bytes_done)
|
||||
{
|
||||
struct bio_integrity_payload *bip = bio->bi_integrity;
|
||||
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
||||
unsigned int nr_sectors;
|
||||
|
||||
BUG_ON(bip == NULL);
|
||||
BUG_ON(bi == NULL);
|
||||
|
||||
nr_sectors = bio_integrity_hw_sectors(bi, bytes_done >> 9);
|
||||
bio_integrity_mark_head(bip, nr_sectors * bi->tuple_size);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_advance);
|
||||
|
||||
/**
|
||||
* bio_integrity_trim - Trim integrity vector
|
||||
* @bio: bio whose integrity vector to update
|
||||
* @offset: offset to first data sector
|
||||
* @sectors: number of data sectors
|
||||
*
|
||||
* Description: Used to trim the integrity vector in a cloned bio.
|
||||
* The ivec will be advanced corresponding to 'offset' data sectors
|
||||
* and the length will be truncated corresponding to 'len' data
|
||||
* sectors.
|
||||
*/
|
||||
void bio_integrity_trim(struct bio *bio, unsigned int offset, unsigned int sectors)
|
||||
{
|
||||
struct bio_integrity_payload *bip = bio->bi_integrity;
|
||||
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
||||
unsigned int nr_sectors;
|
||||
|
||||
BUG_ON(bip == NULL);
|
||||
BUG_ON(bi == NULL);
|
||||
BUG_ON(!bio_flagged(bio, BIO_CLONED));
|
||||
|
||||
nr_sectors = bio_integrity_hw_sectors(bi, sectors);
|
||||
bip->bip_sector = bip->bip_sector + offset;
|
||||
bio_integrity_mark_head(bip, offset * bi->tuple_size);
|
||||
bio_integrity_mark_tail(bip, sectors * bi->tuple_size);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_trim);
|
||||
|
||||
/**
|
||||
* bio_integrity_split - Split integrity metadata
|
||||
* @bio: Protected bio
|
||||
* @bp: Resulting bio_pair
|
||||
* @sectors: Offset
|
||||
*
|
||||
* Description: Splits an integrity page into a bio_pair.
|
||||
*/
|
||||
void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors)
|
||||
{
|
||||
struct blk_integrity *bi;
|
||||
struct bio_integrity_payload *bip = bio->bi_integrity;
|
||||
unsigned int nr_sectors;
|
||||
|
||||
if (bio_integrity(bio) == 0)
|
||||
return;
|
||||
|
||||
bi = bdev_get_integrity(bio->bi_bdev);
|
||||
BUG_ON(bi == NULL);
|
||||
BUG_ON(bip->bip_vcnt != 1);
|
||||
|
||||
nr_sectors = bio_integrity_hw_sectors(bi, sectors);
|
||||
|
||||
bp->bio1.bi_integrity = &bp->bip1;
|
||||
bp->bio2.bi_integrity = &bp->bip2;
|
||||
|
||||
bp->iv1 = bip->bip_vec[0];
|
||||
bp->iv2 = bip->bip_vec[0];
|
||||
|
||||
bp->bip1.bip_vec = &bp->iv1;
|
||||
bp->bip2.bip_vec = &bp->iv2;
|
||||
|
||||
bp->iv1.bv_len = sectors * bi->tuple_size;
|
||||
bp->iv2.bv_offset += sectors * bi->tuple_size;
|
||||
bp->iv2.bv_len -= sectors * bi->tuple_size;
|
||||
|
||||
bp->bip1.bip_sector = bio->bi_integrity->bip_sector;
|
||||
bp->bip2.bip_sector = bio->bi_integrity->bip_sector + nr_sectors;
|
||||
|
||||
bp->bip1.bip_vcnt = bp->bip2.bip_vcnt = 1;
|
||||
bp->bip1.bip_idx = bp->bip2.bip_idx = 0;
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_split);
|
||||
|
||||
/**
|
||||
* bio_integrity_clone - Callback for cloning bios with integrity metadata
|
||||
* @bio: New bio
|
||||
* @bio_src: Original bio
|
||||
* @bs: bio_set to allocate bip from
|
||||
*
|
||||
* Description: Called to allocate a bip when cloning a bio
|
||||
*/
|
||||
int bio_integrity_clone(struct bio *bio, struct bio *bio_src, struct bio_set *bs)
|
||||
{
|
||||
struct bio_integrity_payload *bip_src = bio_src->bi_integrity;
|
||||
struct bio_integrity_payload *bip;
|
||||
|
||||
BUG_ON(bip_src == NULL);
|
||||
|
||||
bip = bio_integrity_alloc_bioset(bio, GFP_NOIO, bip_src->bip_vcnt, bs);
|
||||
|
||||
if (bip == NULL)
|
||||
return -EIO;
|
||||
|
||||
memcpy(bip->bip_vec, bip_src->bip_vec,
|
||||
bip_src->bip_vcnt * sizeof(struct bio_vec));
|
||||
|
||||
bip->bip_sector = bip_src->bip_sector;
|
||||
bip->bip_vcnt = bip_src->bip_vcnt;
|
||||
bip->bip_idx = bip_src->bip_idx;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_clone);
|
||||
|
||||
int bioset_integrity_create(struct bio_set *bs, int pool_size)
|
||||
{
|
||||
bs->bio_integrity_pool = mempool_create_slab_pool(pool_size,
|
||||
bio_integrity_slab);
|
||||
if (!bs->bio_integrity_pool)
|
||||
return -1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(bioset_integrity_create);
|
||||
|
||||
void bioset_integrity_free(struct bio_set *bs)
|
||||
{
|
||||
if (bs->bio_integrity_pool)
|
||||
mempool_destroy(bs->bio_integrity_pool);
|
||||
}
|
||||
EXPORT_SYMBOL(bioset_integrity_free);
|
||||
|
||||
void __init bio_integrity_init_slab(void)
|
||||
{
|
||||
bio_integrity_slab = KMEM_CACHE(bio_integrity_payload,
|
||||
SLAB_HWCACHE_ALIGN|SLAB_PANIC);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_init_slab);
|
||||
|
||||
static int __init integrity_init(void)
|
||||
{
|
||||
kintegrityd_wq = create_workqueue("kintegrityd");
|
||||
|
||||
if (!kintegrityd_wq)
|
||||
panic("Failed to create kintegrityd\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
subsys_initcall(integrity_init);
|
||||
32
fs/bio.c
32
fs/bio.c
|
|
@ -50,6 +50,11 @@ static struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly = {
|
|||
*/
|
||||
struct bio_set *fs_bio_set;
|
||||
|
||||
unsigned int bvec_nr_vecs(unsigned short idx)
|
||||
{
|
||||
return bvec_slabs[idx].nr_vecs;
|
||||
}
|
||||
|
||||
struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct bio_set *bs)
|
||||
{
|
||||
struct bio_vec *bvl;
|
||||
|
|
@ -91,6 +96,9 @@ void bio_free(struct bio *bio, struct bio_set *bio_set)
|
|||
mempool_free(bio->bi_io_vec, bio_set->bvec_pools[pool_idx]);
|
||||
}
|
||||
|
||||
if (bio_integrity(bio))
|
||||
bio_integrity_free(bio, bio_set);
|
||||
|
||||
mempool_free(bio, bio_set->bio_pool);
|
||||
}
|
||||
|
||||
|
|
@ -249,9 +257,19 @@ struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
|
|||
{
|
||||
struct bio *b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, fs_bio_set);
|
||||
|
||||
if (b) {
|
||||
b->bi_destructor = bio_fs_destructor;
|
||||
__bio_clone(b, bio);
|
||||
if (!b)
|
||||
return NULL;
|
||||
|
||||
b->bi_destructor = bio_fs_destructor;
|
||||
__bio_clone(b, bio);
|
||||
|
||||
if (bio_integrity(bio)) {
|
||||
int ret;
|
||||
|
||||
ret = bio_integrity_clone(b, bio, fs_bio_set);
|
||||
|
||||
if (ret < 0)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return b;
|
||||
|
|
@ -1223,6 +1241,9 @@ struct bio_pair *bio_split(struct bio *bi, mempool_t *pool, int first_sectors)
|
|||
bp->bio1.bi_private = bi;
|
||||
bp->bio2.bi_private = pool;
|
||||
|
||||
if (bio_integrity(bi))
|
||||
bio_integrity_split(bi, bp, first_sectors);
|
||||
|
||||
return bp;
|
||||
}
|
||||
|
||||
|
|
@ -1264,6 +1285,7 @@ void bioset_free(struct bio_set *bs)
|
|||
if (bs->bio_pool)
|
||||
mempool_destroy(bs->bio_pool);
|
||||
|
||||
bioset_integrity_free(bs);
|
||||
biovec_free_pools(bs);
|
||||
|
||||
kfree(bs);
|
||||
|
|
@ -1280,6 +1302,9 @@ struct bio_set *bioset_create(int bio_pool_size, int bvec_pool_size)
|
|||
if (!bs->bio_pool)
|
||||
goto bad;
|
||||
|
||||
if (bioset_integrity_create(bs, bio_pool_size))
|
||||
goto bad;
|
||||
|
||||
if (!biovec_create_pools(bs, bvec_pool_size))
|
||||
return bs;
|
||||
|
||||
|
|
@ -1306,6 +1331,7 @@ static int __init init_bio(void)
|
|||
{
|
||||
bio_slab = KMEM_CACHE(bio, SLAB_HWCACHE_ALIGN|SLAB_PANIC);
|
||||
|
||||
bio_integrity_init_slab();
|
||||
biovec_init_slabs();
|
||||
|
||||
fs_bio_set = bioset_create(BIO_POOL_SIZE, 2);
|
||||
|
|
|
|||
|
|
@ -64,6 +64,7 @@ struct bio_vec {
|
|||
|
||||
struct bio_set;
|
||||
struct bio;
|
||||
struct bio_integrity_payload;
|
||||
typedef void (bio_end_io_t) (struct bio *, int);
|
||||
typedef void (bio_destructor_t) (struct bio *);
|
||||
|
||||
|
|
@ -112,6 +113,9 @@ struct bio {
|
|||
atomic_t bi_cnt; /* pin count */
|
||||
|
||||
void *bi_private;
|
||||
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
||||
struct bio_integrity_payload *bi_integrity; /* data integrity */
|
||||
#endif
|
||||
|
||||
bio_destructor_t *bi_destructor; /* destructor */
|
||||
};
|
||||
|
|
@ -271,6 +275,29 @@ static inline void *bio_data(struct bio *bio)
|
|||
*/
|
||||
#define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
|
||||
|
||||
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
||||
/*
|
||||
* bio integrity payload
|
||||
*/
|
||||
struct bio_integrity_payload {
|
||||
struct bio *bip_bio; /* parent bio */
|
||||
struct bio_vec *bip_vec; /* integrity data vector */
|
||||
|
||||
sector_t bip_sector; /* virtual start sector */
|
||||
|
||||
void *bip_buf; /* generated integrity data */
|
||||
bio_end_io_t *bip_end_io; /* saved I/O completion fn */
|
||||
|
||||
int bip_error; /* saved I/O error */
|
||||
unsigned int bip_size;
|
||||
|
||||
unsigned short bip_pool; /* pool the ivec came from */
|
||||
unsigned short bip_vcnt; /* # of integrity bio_vecs */
|
||||
unsigned short bip_idx; /* current bip_vec index */
|
||||
|
||||
struct work_struct bip_work; /* I/O completion */
|
||||
};
|
||||
#endif /* CONFIG_BLK_DEV_INTEGRITY */
|
||||
|
||||
/*
|
||||
* A bio_pair is used when we need to split a bio.
|
||||
|
|
@ -283,10 +310,14 @@ static inline void *bio_data(struct bio *bio)
|
|||
* in bio2.bi_private
|
||||
*/
|
||||
struct bio_pair {
|
||||
struct bio bio1, bio2;
|
||||
struct bio_vec bv1, bv2;
|
||||
atomic_t cnt;
|
||||
int error;
|
||||
struct bio bio1, bio2;
|
||||
struct bio_vec bv1, bv2;
|
||||
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
||||
struct bio_integrity_payload bip1, bip2;
|
||||
struct bio_vec iv1, iv2;
|
||||
#endif
|
||||
atomic_t cnt;
|
||||
int error;
|
||||
};
|
||||
extern struct bio_pair *bio_split(struct bio *bi, mempool_t *pool,
|
||||
int first_sectors);
|
||||
|
|
@ -334,6 +365,7 @@ extern struct bio *bio_copy_user_iov(struct request_queue *, struct sg_iovec *,
|
|||
extern int bio_uncopy_user(struct bio *);
|
||||
void zero_fill_bio(struct bio *bio);
|
||||
extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
|
||||
extern unsigned int bvec_nr_vecs(unsigned short idx);
|
||||
|
||||
/*
|
||||
* bio_set is used to allow other portions of the IO system to
|
||||
|
|
@ -346,6 +378,9 @@ extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set
|
|||
|
||||
struct bio_set {
|
||||
mempool_t *bio_pool;
|
||||
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
||||
mempool_t *bio_integrity_pool;
|
||||
#endif
|
||||
mempool_t *bvec_pools[BIOVEC_NR_POOLS];
|
||||
};
|
||||
|
||||
|
|
@ -410,5 +445,56 @@ static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
|
|||
__bio_kmap_irq((bio), (bio)->bi_idx, (flags))
|
||||
#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
|
||||
|
||||
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
||||
|
||||
#define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
|
||||
#define bip_vec(bip) bip_vec_idx(bip, 0)
|
||||
|
||||
#define __bip_for_each_vec(bvl, bip, i, start_idx) \
|
||||
for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \
|
||||
i < (bip)->bip_vcnt; \
|
||||
bvl++, i++)
|
||||
|
||||
#define bip_for_each_vec(bvl, bip, i) \
|
||||
__bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
|
||||
|
||||
#define bio_integrity(bio) ((bio)->bi_integrity ? 1 : 0)
|
||||
|
||||
extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
|
||||
extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
|
||||
extern void bio_integrity_free(struct bio *, struct bio_set *);
|
||||
extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
|
||||
extern int bio_integrity_enabled(struct bio *bio);
|
||||
extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
|
||||
extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
|
||||
extern int bio_integrity_prep(struct bio *);
|
||||
extern void bio_integrity_endio(struct bio *, int);
|
||||
extern void bio_integrity_advance(struct bio *, unsigned int);
|
||||
extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
|
||||
extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
|
||||
extern int bio_integrity_clone(struct bio *, struct bio *, struct bio_set *);
|
||||
extern int bioset_integrity_create(struct bio_set *, int);
|
||||
extern void bioset_integrity_free(struct bio_set *);
|
||||
extern void bio_integrity_init_slab(void);
|
||||
|
||||
#else /* CONFIG_BLK_DEV_INTEGRITY */
|
||||
|
||||
#define bio_integrity(a) (0)
|
||||
#define bioset_integrity_create(a, b) (0)
|
||||
#define bio_integrity_prep(a) (0)
|
||||
#define bio_integrity_enabled(a) (0)
|
||||
#define bio_integrity_clone(a, b, c) (0)
|
||||
#define bioset_integrity_free(a) do { } while (0)
|
||||
#define bio_integrity_free(a, b) do { } while (0)
|
||||
#define bio_integrity_endio(a, b) do { } while (0)
|
||||
#define bio_integrity_advance(a, b) do { } while (0)
|
||||
#define bio_integrity_trim(a, b, c) do { } while (0)
|
||||
#define bio_integrity_split(a, b, c) do { } while (0)
|
||||
#define bio_integrity_set_tag(a, b, c) do { } while (0)
|
||||
#define bio_integrity_get_tag(a, b, c) do { } while (0)
|
||||
#define bio_integrity_init_slab(a) do { } while (0)
|
||||
|
||||
#endif /* CONFIG_BLK_DEV_INTEGRITY */
|
||||
|
||||
#endif /* CONFIG_BLOCK */
|
||||
#endif /* __LINUX_BIO_H */
|
||||
|
|
|
|||
|
|
@ -112,6 +112,7 @@ enum rq_flag_bits {
|
|||
__REQ_ALLOCED, /* request came from our alloc pool */
|
||||
__REQ_RW_META, /* metadata io request */
|
||||
__REQ_COPY_USER, /* contains copies of user pages */
|
||||
__REQ_INTEGRITY, /* integrity metadata has been remapped */
|
||||
__REQ_NR_BITS, /* stops here */
|
||||
};
|
||||
|
||||
|
|
@ -134,6 +135,7 @@ enum rq_flag_bits {
|
|||
#define REQ_ALLOCED (1 << __REQ_ALLOCED)
|
||||
#define REQ_RW_META (1 << __REQ_RW_META)
|
||||
#define REQ_COPY_USER (1 << __REQ_COPY_USER)
|
||||
#define REQ_INTEGRITY (1 << __REQ_INTEGRITY)
|
||||
|
||||
#define BLK_MAX_CDB 16
|
||||
|
||||
|
|
@ -865,6 +867,109 @@ void kblockd_flush_work(struct work_struct *work);
|
|||
MODULE_ALIAS("block-major-" __stringify(major) "-*")
|
||||
|
||||
|
||||
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
||||
|
||||
#define INTEGRITY_FLAG_READ 1 /* verify data integrity on read */
|
||||
#define INTEGRITY_FLAG_WRITE 2 /* generate data integrity on write */
|
||||
|
||||
struct blk_integrity_exchg {
|
||||
void *prot_buf;
|
||||
void *data_buf;
|
||||
sector_t sector;
|
||||
unsigned int data_size;
|
||||
unsigned short sector_size;
|
||||
const char *disk_name;
|
||||
};
|
||||
|
||||
typedef void (integrity_gen_fn) (struct blk_integrity_exchg *);
|
||||
typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *);
|
||||
typedef void (integrity_set_tag_fn) (void *, void *, unsigned int);
|
||||
typedef void (integrity_get_tag_fn) (void *, void *, unsigned int);
|
||||
|
||||
struct blk_integrity {
|
||||
integrity_gen_fn *generate_fn;
|
||||
integrity_vrfy_fn *verify_fn;
|
||||
integrity_set_tag_fn *set_tag_fn;
|
||||
integrity_get_tag_fn *get_tag_fn;
|
||||
|
||||
unsigned short flags;
|
||||
unsigned short tuple_size;
|
||||
unsigned short sector_size;
|
||||
unsigned short tag_size;
|
||||
|
||||
const char *name;
|
||||
|
||||
struct kobject kobj;
|
||||
};
|
||||
|
||||
extern int blk_integrity_register(struct gendisk *, struct blk_integrity *);
|
||||
extern void blk_integrity_unregister(struct gendisk *);
|
||||
extern int blk_integrity_compare(struct block_device *, struct block_device *);
|
||||
extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *);
|
||||
extern int blk_rq_count_integrity_sg(struct request *);
|
||||
|
||||
static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi)
|
||||
{
|
||||
if (bi)
|
||||
return bi->tuple_size;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
|
||||
{
|
||||
return bdev->bd_disk->integrity;
|
||||
}
|
||||
|
||||
static inline unsigned int bdev_get_tag_size(struct block_device *bdev)
|
||||
{
|
||||
struct blk_integrity *bi = bdev_get_integrity(bdev);
|
||||
|
||||
if (bi)
|
||||
return bi->tag_size;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int bdev_integrity_enabled(struct block_device *bdev, int rw)
|
||||
{
|
||||
struct blk_integrity *bi = bdev_get_integrity(bdev);
|
||||
|
||||
if (bi == NULL)
|
||||
return 0;
|
||||
|
||||
if (rw == READ && bi->verify_fn != NULL &&
|
||||
test_bit(INTEGRITY_FLAG_READ, &bi->flags))
|
||||
return 1;
|
||||
|
||||
if (rw == WRITE && bi->generate_fn != NULL &&
|
||||
test_bit(INTEGRITY_FLAG_WRITE, &bi->flags))
|
||||
return 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int blk_integrity_rq(struct request *rq)
|
||||
{
|
||||
BUG_ON(rq->bio == NULL);
|
||||
|
||||
return bio_integrity(rq->bio);
|
||||
}
|
||||
|
||||
#else /* CONFIG_BLK_DEV_INTEGRITY */
|
||||
|
||||
#define blk_integrity_rq(rq) (0)
|
||||
#define blk_rq_count_integrity_sg(a) (0)
|
||||
#define blk_rq_map_integrity_sg(a, b) (0)
|
||||
#define bdev_get_integrity(a) (0)
|
||||
#define bdev_get_tag_size(a) (0)
|
||||
#define blk_integrity_compare(a, b) (0)
|
||||
#define blk_integrity_register(a, b) (0)
|
||||
#define blk_integrity_unregister(a) do { } while (0);
|
||||
|
||||
#endif /* CONFIG_BLK_DEV_INTEGRITY */
|
||||
|
||||
|
||||
#else /* CONFIG_BLOCK */
|
||||
/*
|
||||
* stubs for when the block layer is configured out
|
||||
|
|
|
|||
|
|
@ -141,6 +141,9 @@ struct gendisk {
|
|||
struct disk_stats dkstats;
|
||||
#endif
|
||||
struct work_struct async_notify;
|
||||
#ifdef CONFIG_BLK_DEV_INTEGRITY
|
||||
struct blk_integrity *integrity;
|
||||
#endif
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
|
|||
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