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![Mike Snitzer](/assets/img/avatar_default.png)
The current block integrity (DIF/DIX) support in DM is verifying that all devices' integrity profiles match during DM device resume (which is past the point of no return). To some degree that is unavoidable (stacked DM devices force this late checking). But for most DM devices (which aren't stacking on other DM devices) the ideal time to verify all integrity profiles match is during table load. Introduce the notion of an "initialized" integrity profile: a profile that was blk_integrity_register()'d with a non-NULL 'blk_integrity' template. Add blk_integrity_is_initialized() to allow checking if a profile was initialized. Update DM integrity support to: - check all devices with _initialized_ integrity profiles match during table load; uninitialized profiles (e.g. for underlying DM device(s) of a stacked DM device) are ignored. - disallow a table load that would result in an integrity profile that conflicts with a DM device's existing (in-use) integrity profile - avoid clearing an existing integrity profile - validate all integrity profiles match during resume; but if they don't all we can do is report the mismatch (during resume we're past the point of no return) Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
447 lines
11 KiB
C
447 lines
11 KiB
C
/*
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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/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->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 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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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(&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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