Initial commit
This commit is contained in:
Ole André Vadla Ravnås
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51358 changed files with 23120455 additions and 0 deletions
452
block/blk-integrity.c
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452
block/blk-integrity.c
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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 <linux/export.h>
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#include <linux/slab.h>
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#include "blk.h"
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static struct kmem_cache *integrity_cachep;
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static const char *bi_unsupported_name = "unsupported";
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/**
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* blk_rq_count_integrity_sg - Count number of integrity scatterlist elements
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* @q: request queue
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* @bio: bio with integrity metadata attached
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*
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* Description: Returns the number of elements required in a
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* scatterlist corresponding to the integrity metadata in a bio.
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*/
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int blk_rq_count_integrity_sg(struct request_queue *q, struct bio *bio)
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{
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struct bio_vec *iv, *ivprv = NULL;
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unsigned int segments = 0;
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unsigned int seg_size = 0;
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unsigned int i = 0;
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bio_for_each_integrity_vec(iv, bio, i) {
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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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if (!BIOVEC_SEG_BOUNDARY(q, ivprv, iv))
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goto new_segment;
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if (seg_size + iv->bv_len > queue_max_segment_size(q))
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goto new_segment;
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seg_size += iv->bv_len;
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} else {
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new_segment:
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segments++;
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seg_size = iv->bv_len;
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}
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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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* @q: request queue
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* @bio: bio 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_queue *q, struct bio *bio,
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struct scatterlist *sglist)
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{
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struct bio_vec *iv, *ivprv = NULL;
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struct scatterlist *sg = NULL;
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unsigned int segments = 0;
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unsigned int i = 0;
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bio_for_each_integrity_vec(iv, bio, i) {
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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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if (!BIOVEC_SEG_BOUNDARY(q, ivprv, iv))
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goto new_segment;
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if (sg->length + iv->bv_len > queue_max_segment_size(q))
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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_unmark_end(sg);
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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 disks
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* @gd1: Disk to compare
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* @gd2: Disk 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 gendisk devices have
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* compatible integrity formats.
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*/
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int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)
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{
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struct blk_integrity *b1 = gd1->integrity;
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struct blk_integrity *b2 = gd2->integrity;
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if (!b1 && !b2)
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return 0;
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if (!b1 || !b2)
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return -1;
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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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gd1->disk_name, gd2->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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gd1->disk_name, gd2->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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gd1->disk_name, gd2->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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gd1->disk_name, gd2->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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int blk_integrity_merge_rq(struct request_queue *q, struct request *req,
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struct request *next)
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{
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if (blk_integrity_rq(req) != blk_integrity_rq(next))
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return -1;
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if (req->nr_integrity_segments + next->nr_integrity_segments >
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q->limits.max_integrity_segments)
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return -1;
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return 0;
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}
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EXPORT_SYMBOL(blk_integrity_merge_rq);
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int blk_integrity_merge_bio(struct request_queue *q, struct request *req,
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struct bio *bio)
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{
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int nr_integrity_segs;
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struct bio *next = bio->bi_next;
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bio->bi_next = NULL;
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nr_integrity_segs = blk_rq_count_integrity_sg(q, bio);
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bio->bi_next = next;
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if (req->nr_integrity_segments + nr_integrity_segs >
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q->limits.max_integrity_segments)
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return -1;
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req->nr_integrity_segments += nr_integrity_segs;
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return 0;
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}
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EXPORT_SYMBOL(blk_integrity_merge_bio);
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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,
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struct attribute *attr, const char *page,
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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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bi->flags |= INTEGRITY_FLAG_READ;
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else
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bi->flags &= ~INTEGRITY_FLAG_READ;
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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", (bi->flags & INTEGRITY_FLAG_READ) != 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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bi->flags |= INTEGRITY_FLAG_WRITE;
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else
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bi->flags &= ~INTEGRITY_FLAG_WRITE;
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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", (bi->flags & INTEGRITY_FLAG_WRITE) != 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 const 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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bool blk_integrity_is_initialized(struct gendisk *disk)
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{
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struct blk_integrity *bi = blk_get_integrity(disk);
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return (bi && bi->name && strcmp(bi->name, bi_unsupported_name) != 0);
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}
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EXPORT_SYMBOL(blk_integrity_is_initialized);
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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: optional integrity profile to register
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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. If template is NULL the new profile is allocated but
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* not filled out. 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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if (disk->integrity == NULL) {
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bi = kmem_cache_alloc(integrity_cachep,
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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_to_dev(disk)->kobj,
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"%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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bi->flags |= INTEGRITY_FLAG_READ | INTEGRITY_FLAG_WRITE;
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bi->sector_size = queue_logical_block_size(disk->queue);
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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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if (template != NULL) {
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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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} else
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bi->name = bi_unsupported_name;
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disk->queue->backing_dev_info.capabilities |= BDI_CAP_STABLE_WRITES;
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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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disk->queue->backing_dev_info.capabilities &= ~BDI_CAP_STABLE_WRITES;
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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(&bi->kobj);
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disk->integrity = NULL;
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}
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EXPORT_SYMBOL(blk_integrity_unregister);
|
||||
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