699 lines
18 KiB
C
699 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* bio-integrity.c - bio data integrity extensions
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*
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* Copyright (C) 2007, 2008, 2009 Oracle Corporation
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* Written by: Martin K. Petersen <martin.petersen@oracle.com>
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*/
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#include <linux/blk-integrity.h>
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#include <linux/mempool.h>
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#include <linux/export.h>
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#include <linux/bio.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include "blk.h"
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static struct kmem_cache *bip_slab;
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static struct workqueue_struct *kintegrityd_wq;
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void blk_flush_integrity(void)
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{
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flush_workqueue(kintegrityd_wq);
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}
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static void __bio_integrity_free(struct bio_set *bs,
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struct bio_integrity_payload *bip)
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{
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if (bs && mempool_initialized(&bs->bio_integrity_pool)) {
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if (bip->bip_vec)
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bvec_free(&bs->bvec_integrity_pool, bip->bip_vec,
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bip->bip_max_vcnt);
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mempool_free(bip, &bs->bio_integrity_pool);
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} else {
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kfree(bip);
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}
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}
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/**
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* bio_integrity_alloc - Allocate integrity payload and attach it to bio
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* @bio: bio to attach integrity metadata to
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* @gfp_mask: Memory allocation mask
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* @nr_vecs: Number of integrity metadata scatter-gather elements
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*
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* Description: This function prepares a bio for attaching integrity
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* metadata. nr_vecs specifies the maximum number of pages containing
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* integrity metadata that can be attached.
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*/
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struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
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gfp_t gfp_mask,
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unsigned int nr_vecs)
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{
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struct bio_integrity_payload *bip;
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struct bio_set *bs = bio->bi_pool;
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unsigned inline_vecs;
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if (WARN_ON_ONCE(bio_has_crypt_ctx(bio)))
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return ERR_PTR(-EOPNOTSUPP);
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if (!bs || !mempool_initialized(&bs->bio_integrity_pool)) {
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bip = kmalloc(struct_size(bip, bip_inline_vecs, nr_vecs), gfp_mask);
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inline_vecs = nr_vecs;
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} else {
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bip = mempool_alloc(&bs->bio_integrity_pool, gfp_mask);
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inline_vecs = BIO_INLINE_VECS;
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}
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if (unlikely(!bip))
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return ERR_PTR(-ENOMEM);
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memset(bip, 0, sizeof(*bip));
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/* always report as many vecs as asked explicitly, not inline vecs */
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bip->bip_max_vcnt = nr_vecs;
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if (nr_vecs > inline_vecs) {
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bip->bip_vec = bvec_alloc(&bs->bvec_integrity_pool,
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&bip->bip_max_vcnt, gfp_mask);
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if (!bip->bip_vec)
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goto err;
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} else {
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bip->bip_vec = bip->bip_inline_vecs;
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}
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bip->bip_bio = bio;
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bio->bi_integrity = bip;
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bio->bi_opf |= REQ_INTEGRITY;
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return bip;
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err:
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__bio_integrity_free(bs, bip);
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return ERR_PTR(-ENOMEM);
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}
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EXPORT_SYMBOL(bio_integrity_alloc);
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static void bio_integrity_unpin_bvec(struct bio_vec *bv, int nr_vecs,
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bool dirty)
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{
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int i;
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for (i = 0; i < nr_vecs; i++) {
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if (dirty && !PageCompound(bv[i].bv_page))
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set_page_dirty_lock(bv[i].bv_page);
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unpin_user_page(bv[i].bv_page);
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}
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}
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static void bio_integrity_uncopy_user(struct bio_integrity_payload *bip)
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{
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unsigned short nr_vecs = bip->bip_max_vcnt - 1;
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struct bio_vec *copy = &bip->bip_vec[1];
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size_t bytes = bip->bip_iter.bi_size;
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struct iov_iter iter;
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int ret;
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iov_iter_bvec(&iter, ITER_DEST, copy, nr_vecs, bytes);
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ret = copy_to_iter(bvec_virt(bip->bip_vec), bytes, &iter);
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WARN_ON_ONCE(ret != bytes);
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bio_integrity_unpin_bvec(copy, nr_vecs, true);
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}
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static void bio_integrity_unmap_user(struct bio_integrity_payload *bip)
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{
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bool dirty = bio_data_dir(bip->bip_bio) == READ;
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if (bip->bip_flags & BIP_COPY_USER) {
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if (dirty)
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bio_integrity_uncopy_user(bip);
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kfree(bvec_virt(bip->bip_vec));
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return;
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}
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bio_integrity_unpin_bvec(bip->bip_vec, bip->bip_max_vcnt, dirty);
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}
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/**
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* bio_integrity_free - Free bio integrity payload
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* @bio: bio containing bip to be freed
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*
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* Description: Used to free the integrity portion of a bio. Usually
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* called from bio_free().
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*/
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void bio_integrity_free(struct bio *bio)
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{
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct bio_set *bs = bio->bi_pool;
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if (bip->bip_flags & BIP_INTEGRITY_USER)
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return;
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if (bip->bip_flags & BIP_BLOCK_INTEGRITY)
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kfree(bvec_virt(bip->bip_vec));
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__bio_integrity_free(bs, bip);
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bio->bi_integrity = NULL;
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bio->bi_opf &= ~REQ_INTEGRITY;
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}
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/**
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* bio_integrity_unmap_free_user - Unmap and free bio user integrity payload
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* @bio: bio containing bip to be unmapped and freed
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*
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* Description: Used to unmap and free the user mapped integrity portion of a
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* bio. Submitter attaching the user integrity buffer is responsible for
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* unmapping and freeing it during completion.
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*/
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void bio_integrity_unmap_free_user(struct bio *bio)
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{
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct bio_set *bs = bio->bi_pool;
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if (WARN_ON_ONCE(!(bip->bip_flags & BIP_INTEGRITY_USER)))
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return;
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bio_integrity_unmap_user(bip);
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__bio_integrity_free(bs, bip);
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bio->bi_integrity = NULL;
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bio->bi_opf &= ~REQ_INTEGRITY;
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}
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EXPORT_SYMBOL(bio_integrity_unmap_free_user);
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/**
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* bio_integrity_add_page - Attach integrity metadata
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* @bio: bio to update
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* @page: page containing integrity metadata
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* @len: number of bytes of integrity metadata in page
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* @offset: start offset within page
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*
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* Description: Attach a page containing integrity metadata to bio.
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*/
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int bio_integrity_add_page(struct bio *bio, struct page *page,
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unsigned int len, unsigned int offset)
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{
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struct request_queue *q = bdev_get_queue(bio->bi_bdev);
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struct bio_integrity_payload *bip = bio_integrity(bio);
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if (((bip->bip_iter.bi_size + len) >> SECTOR_SHIFT) >
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queue_max_hw_sectors(q))
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return 0;
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if (bip->bip_vcnt > 0) {
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struct bio_vec *bv = &bip->bip_vec[bip->bip_vcnt - 1];
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bool same_page = false;
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if (bvec_try_merge_hw_page(q, bv, page, len, offset,
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&same_page)) {
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bip->bip_iter.bi_size += len;
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return len;
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}
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if (bip->bip_vcnt >=
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min(bip->bip_max_vcnt, queue_max_integrity_segments(q)))
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return 0;
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/*
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* If the queue doesn't support SG gaps and adding this segment
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* would create a gap, disallow it.
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*/
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if (bvec_gap_to_prev(&q->limits, bv, offset))
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return 0;
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}
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bvec_set_page(&bip->bip_vec[bip->bip_vcnt], page, len, offset);
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bip->bip_vcnt++;
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bip->bip_iter.bi_size += len;
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return len;
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}
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EXPORT_SYMBOL(bio_integrity_add_page);
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static int bio_integrity_copy_user(struct bio *bio, struct bio_vec *bvec,
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int nr_vecs, unsigned int len,
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unsigned int direction, u32 seed)
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{
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bool write = direction == ITER_SOURCE;
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struct bio_integrity_payload *bip;
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struct iov_iter iter;
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void *buf;
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int ret;
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buf = kmalloc(len, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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if (write) {
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iov_iter_bvec(&iter, direction, bvec, nr_vecs, len);
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if (!copy_from_iter_full(buf, len, &iter)) {
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ret = -EFAULT;
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goto free_buf;
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}
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bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
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} else {
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memset(buf, 0, len);
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/*
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* We need to preserve the original bvec and the number of vecs
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* in it for completion handling
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*/
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bip = bio_integrity_alloc(bio, GFP_KERNEL, nr_vecs + 1);
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}
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if (IS_ERR(bip)) {
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ret = PTR_ERR(bip);
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goto free_buf;
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}
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if (write)
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bio_integrity_unpin_bvec(bvec, nr_vecs, false);
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else
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memcpy(&bip->bip_vec[1], bvec, nr_vecs * sizeof(*bvec));
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ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
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offset_in_page(buf));
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if (ret != len) {
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ret = -ENOMEM;
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goto free_bip;
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}
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bip->bip_flags |= BIP_INTEGRITY_USER | BIP_COPY_USER;
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bip->bip_iter.bi_sector = seed;
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return 0;
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free_bip:
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bio_integrity_free(bio);
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free_buf:
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kfree(buf);
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return ret;
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}
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static int bio_integrity_init_user(struct bio *bio, struct bio_vec *bvec,
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int nr_vecs, unsigned int len, u32 seed)
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{
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struct bio_integrity_payload *bip;
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bip = bio_integrity_alloc(bio, GFP_KERNEL, nr_vecs);
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if (IS_ERR(bip))
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return PTR_ERR(bip);
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memcpy(bip->bip_vec, bvec, nr_vecs * sizeof(*bvec));
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bip->bip_flags |= BIP_INTEGRITY_USER;
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bip->bip_iter.bi_sector = seed;
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bip->bip_iter.bi_size = len;
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return 0;
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}
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static unsigned int bvec_from_pages(struct bio_vec *bvec, struct page **pages,
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int nr_vecs, ssize_t bytes, ssize_t offset)
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{
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unsigned int nr_bvecs = 0;
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int i, j;
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for (i = 0; i < nr_vecs; i = j) {
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size_t size = min_t(size_t, bytes, PAGE_SIZE - offset);
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struct folio *folio = page_folio(pages[i]);
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bytes -= size;
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for (j = i + 1; j < nr_vecs; j++) {
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size_t next = min_t(size_t, PAGE_SIZE, bytes);
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if (page_folio(pages[j]) != folio ||
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pages[j] != pages[j - 1] + 1)
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break;
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unpin_user_page(pages[j]);
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size += next;
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bytes -= next;
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}
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bvec_set_page(&bvec[nr_bvecs], pages[i], size, offset);
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offset = 0;
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nr_bvecs++;
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}
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return nr_bvecs;
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}
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int bio_integrity_map_user(struct bio *bio, void __user *ubuf, ssize_t bytes,
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u32 seed)
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{
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struct request_queue *q = bdev_get_queue(bio->bi_bdev);
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unsigned int align = q->dma_pad_mask | queue_dma_alignment(q);
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struct page *stack_pages[UIO_FASTIOV], **pages = stack_pages;
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struct bio_vec stack_vec[UIO_FASTIOV], *bvec = stack_vec;
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unsigned int direction, nr_bvecs;
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struct iov_iter iter;
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int ret, nr_vecs;
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size_t offset;
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bool copy;
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if (bio_integrity(bio))
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return -EINVAL;
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if (bytes >> SECTOR_SHIFT > queue_max_hw_sectors(q))
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return -E2BIG;
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if (bio_data_dir(bio) == READ)
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direction = ITER_DEST;
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else
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direction = ITER_SOURCE;
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iov_iter_ubuf(&iter, direction, ubuf, bytes);
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nr_vecs = iov_iter_npages(&iter, BIO_MAX_VECS + 1);
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if (nr_vecs > BIO_MAX_VECS)
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return -E2BIG;
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if (nr_vecs > UIO_FASTIOV) {
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bvec = kcalloc(nr_vecs, sizeof(*bvec), GFP_KERNEL);
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if (!bvec)
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return -ENOMEM;
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pages = NULL;
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}
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copy = !iov_iter_is_aligned(&iter, align, align);
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ret = iov_iter_extract_pages(&iter, &pages, bytes, nr_vecs, 0, &offset);
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if (unlikely(ret < 0))
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goto free_bvec;
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nr_bvecs = bvec_from_pages(bvec, pages, nr_vecs, bytes, offset);
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if (pages != stack_pages)
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kvfree(pages);
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if (nr_bvecs > queue_max_integrity_segments(q))
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copy = true;
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if (copy)
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ret = bio_integrity_copy_user(bio, bvec, nr_bvecs, bytes,
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direction, seed);
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else
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ret = bio_integrity_init_user(bio, bvec, nr_bvecs, bytes, seed);
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if (ret)
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goto release_pages;
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if (bvec != stack_vec)
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kfree(bvec);
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return 0;
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release_pages:
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bio_integrity_unpin_bvec(bvec, nr_bvecs, false);
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free_bvec:
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if (bvec != stack_vec)
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kfree(bvec);
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return ret;
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}
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EXPORT_SYMBOL_GPL(bio_integrity_map_user);
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/**
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* bio_integrity_process - Process integrity metadata for a bio
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* @bio: bio to generate/verify integrity metadata for
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* @proc_iter: iterator to process
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* @proc_fn: Pointer to the relevant processing function
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*/
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static blk_status_t bio_integrity_process(struct bio *bio,
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struct bvec_iter *proc_iter, integrity_processing_fn *proc_fn)
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{
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struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
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struct blk_integrity_iter iter;
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struct bvec_iter bviter;
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struct bio_vec bv;
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struct bio_integrity_payload *bip = bio_integrity(bio);
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blk_status_t ret = BLK_STS_OK;
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iter.disk_name = bio->bi_bdev->bd_disk->disk_name;
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iter.interval = 1 << bi->interval_exp;
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iter.tuple_size = bi->tuple_size;
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iter.seed = proc_iter->bi_sector;
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iter.prot_buf = bvec_virt(bip->bip_vec);
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iter.pi_offset = bi->pi_offset;
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__bio_for_each_segment(bv, bio, bviter, *proc_iter) {
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void *kaddr = bvec_kmap_local(&bv);
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iter.data_buf = kaddr;
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iter.data_size = bv.bv_len;
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ret = proc_fn(&iter);
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kunmap_local(kaddr);
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if (ret)
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break;
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}
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return ret;
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}
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/**
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* bio_integrity_prep - Prepare bio for integrity I/O
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* @bio: bio to prepare
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*
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* Description: Checks if the bio already has an integrity payload attached.
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* If it does, the payload has been generated by another kernel subsystem,
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* and we just pass it through. Otherwise allocates integrity payload.
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* The bio must have data direction, target device and start sector set priot
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* to calling. In the WRITE case, integrity metadata will be generated using
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* the block device's integrity function. In the READ case, the buffer
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* will be prepared for DMA and a suitable end_io handler set up.
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*/
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bool bio_integrity_prep(struct bio *bio)
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{
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struct bio_integrity_payload *bip;
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struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
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void *buf;
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unsigned long start, end;
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unsigned int len, nr_pages;
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unsigned int bytes, offset, i;
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if (!bi)
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return true;
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if (bio_op(bio) != REQ_OP_READ && bio_op(bio) != REQ_OP_WRITE)
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return true;
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if (!bio_sectors(bio))
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return true;
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/* Already protected? */
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if (bio_integrity(bio))
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return true;
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if (bio_data_dir(bio) == READ) {
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if (!bi->profile->verify_fn ||
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!(bi->flags & BLK_INTEGRITY_VERIFY))
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return true;
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} else {
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if (!bi->profile->generate_fn ||
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!(bi->flags & BLK_INTEGRITY_GENERATE))
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return true;
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}
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/* Allocate kernel buffer for protection data */
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len = bio_integrity_bytes(bi, bio_sectors(bio));
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buf = kmalloc(len, GFP_NOIO);
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if (unlikely(buf == NULL)) {
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printk(KERN_ERR "could not allocate integrity buffer\n");
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goto err_end_io;
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}
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end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
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start = ((unsigned long) buf) >> PAGE_SHIFT;
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nr_pages = end - start;
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/* Allocate bio integrity payload and integrity vectors */
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bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages);
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if (IS_ERR(bip)) {
|
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printk(KERN_ERR "could not allocate data integrity bioset\n");
|
|
kfree(buf);
|
|
goto err_end_io;
|
|
}
|
|
|
|
bip->bip_flags |= BIP_BLOCK_INTEGRITY;
|
|
bip_set_seed(bip, bio->bi_iter.bi_sector);
|
|
|
|
if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM)
|
|
bip->bip_flags |= BIP_IP_CHECKSUM;
|
|
|
|
/* Map it */
|
|
offset = offset_in_page(buf);
|
|
for (i = 0; i < nr_pages && len > 0; i++) {
|
|
bytes = PAGE_SIZE - offset;
|
|
|
|
if (bytes > len)
|
|
bytes = len;
|
|
|
|
if (bio_integrity_add_page(bio, virt_to_page(buf),
|
|
bytes, offset) < bytes) {
|
|
printk(KERN_ERR "could not attach integrity payload\n");
|
|
goto err_end_io;
|
|
}
|
|
|
|
buf += bytes;
|
|
len -= bytes;
|
|
offset = 0;
|
|
}
|
|
|
|
/* Auto-generate integrity metadata if this is a write */
|
|
if (bio_data_dir(bio) == WRITE) {
|
|
bio_integrity_process(bio, &bio->bi_iter,
|
|
bi->profile->generate_fn);
|
|
} else {
|
|
bip->bio_iter = bio->bi_iter;
|
|
}
|
|
return true;
|
|
|
|
err_end_io:
|
|
bio->bi_status = BLK_STS_RESOURCE;
|
|
bio_endio(bio);
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_prep);
|
|
|
|
/**
|
|
* 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;
|
|
struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
|
|
|
|
/*
|
|
* At the moment verify is called bio's iterator was advanced
|
|
* during split and completion, we need to rewind iterator to
|
|
* it's original position.
|
|
*/
|
|
bio->bi_status = bio_integrity_process(bio, &bip->bio_iter,
|
|
bi->profile->verify_fn);
|
|
bio_integrity_free(bio);
|
|
bio_endio(bio);
|
|
}
|
|
|
|
/**
|
|
* __bio_integrity_endio - Integrity I/O completion function
|
|
* @bio: Protected bio
|
|
*
|
|
* 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.
|
|
*/
|
|
bool __bio_integrity_endio(struct bio *bio)
|
|
{
|
|
struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
|
|
struct bio_integrity_payload *bip = bio_integrity(bio);
|
|
|
|
if (bio_op(bio) == REQ_OP_READ && !bio->bi_status &&
|
|
(bip->bip_flags & BIP_BLOCK_INTEGRITY) && bi->profile->verify_fn) {
|
|
INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
|
|
queue_work(kintegrityd_wq, &bip->bip_work);
|
|
return false;
|
|
}
|
|
|
|
bio_integrity_free(bio);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* 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_integrity(bio);
|
|
struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
|
|
unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9);
|
|
|
|
bip->bip_iter.bi_sector += bio_integrity_intervals(bi, bytes_done >> 9);
|
|
bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes);
|
|
}
|
|
|
|
/**
|
|
* bio_integrity_trim - Trim integrity vector
|
|
* @bio: bio whose integrity vector to update
|
|
*
|
|
* Description: Used to trim the integrity vector in a cloned bio.
|
|
*/
|
|
void bio_integrity_trim(struct bio *bio)
|
|
{
|
|
struct bio_integrity_payload *bip = bio_integrity(bio);
|
|
struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
|
|
|
|
bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio));
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_trim);
|
|
|
|
/**
|
|
* bio_integrity_clone - Callback for cloning bios with integrity metadata
|
|
* @bio: New bio
|
|
* @bio_src: Original bio
|
|
* @gfp_mask: Memory allocation mask
|
|
*
|
|
* Description: Called to allocate a bip when cloning a bio
|
|
*/
|
|
int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
|
|
gfp_t gfp_mask)
|
|
{
|
|
struct bio_integrity_payload *bip_src = bio_integrity(bio_src);
|
|
struct bio_integrity_payload *bip;
|
|
|
|
BUG_ON(bip_src == NULL);
|
|
|
|
bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt);
|
|
if (IS_ERR(bip))
|
|
return PTR_ERR(bip);
|
|
|
|
memcpy(bip->bip_vec, bip_src->bip_vec,
|
|
bip_src->bip_vcnt * sizeof(struct bio_vec));
|
|
|
|
bip->bip_vcnt = bip_src->bip_vcnt;
|
|
bip->bip_iter = bip_src->bip_iter;
|
|
bip->bip_flags = bip_src->bip_flags & ~BIP_BLOCK_INTEGRITY;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bioset_integrity_create(struct bio_set *bs, int pool_size)
|
|
{
|
|
if (mempool_initialized(&bs->bio_integrity_pool))
|
|
return 0;
|
|
|
|
if (mempool_init_slab_pool(&bs->bio_integrity_pool,
|
|
pool_size, bip_slab))
|
|
return -1;
|
|
|
|
if (biovec_init_pool(&bs->bvec_integrity_pool, pool_size)) {
|
|
mempool_exit(&bs->bio_integrity_pool);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(bioset_integrity_create);
|
|
|
|
void bioset_integrity_free(struct bio_set *bs)
|
|
{
|
|
mempool_exit(&bs->bio_integrity_pool);
|
|
mempool_exit(&bs->bvec_integrity_pool);
|
|
}
|
|
|
|
void __init bio_integrity_init(void)
|
|
{
|
|
/*
|
|
* kintegrityd won't block much but may burn a lot of CPU cycles.
|
|
* Make it highpri CPU intensive wq with max concurrency of 1.
|
|
*/
|
|
kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM |
|
|
WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1);
|
|
if (!kintegrityd_wq)
|
|
panic("Failed to create kintegrityd\n");
|
|
|
|
bip_slab = kmem_cache_create("bio_integrity_payload",
|
|
sizeof(struct bio_integrity_payload) +
|
|
sizeof(struct bio_vec) * BIO_INLINE_VECS,
|
|
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
|
|
}
|