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Splitting the bio works correctly. The function bio_split will clone the bio, trim the iterator of the first bio and advance the iterator of the second bio. However, the function rq_integrity_vec has a bug - it returns the first vector of the bio's metadata and completely disregards the metadata iterator that was advanced when the bio was split. Thus, the second bio uses the same metadata as the first bio and this leads to metadata corruption. This commit changes rq_integrity_vec, so that it calls mp_bvec_iter_bvec instead of returning the first vector. mp_bvec_iter_bvec reads the iterator and advances the vector by the iterator. Signed-off-by: Mikulas Patocka --- drivers/nvme/host/pci.c | 6 +++--- include/linux/blk-integrity.h | 10 ++++++---- 2 files changed, 9 insertions(+), 7 deletions(-) Index: linux-2.6/drivers/nvme/host/pci.c =================================================================== --- linux-2.6.orig/drivers/nvme/host/pci.c +++ linux-2.6/drivers/nvme/host/pci.c @@ -825,9 +825,9 @@ static blk_status_t nvme_map_metadata(st struct nvme_command *cmnd) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + struct bio_vec bv = rq_integrity_vec(req); - iod->meta_dma = dma_map_bvec(dev->dev, rq_integrity_vec(req), - rq_dma_dir(req), 0); + iod->meta_dma = dma_map_bvec(dev->dev, &bv, rq_dma_dir(req), 0); if (dma_mapping_error(dev->dev, iod->meta_dma)) return BLK_STS_IOERR; cmnd->rw.metadata = cpu_to_le64(iod->meta_dma); @@ -966,7 +966,7 @@ static __always_inline void nvme_pci_unm struct nvme_iod *iod = blk_mq_rq_to_pdu(req); dma_unmap_page(dev->dev, iod->meta_dma, - rq_integrity_vec(req)->bv_len, rq_dma_dir(req)); + rq_integrity_vec(req).bv_len, rq_dma_dir(req)); } if (blk_rq_nr_phys_segments(req)) Index: linux-2.6/include/linux/blk-integrity.h =================================================================== --- linux-2.6.orig/include/linux/blk-integrity.h +++ linux-2.6/include/linux/blk-integrity.h @@ -109,11 +109,12 @@ static inline bool blk_integrity_rq(stru * Return the first bvec that contains integrity data. Only drivers that are * limited to a single integrity segment should use this helper. */ -static inline struct bio_vec *rq_integrity_vec(struct request *rq) +static inline struct bio_vec rq_integrity_vec(struct request *rq) { if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) - return NULL; - return rq->bio->bi_integrity->bip_vec; + return (struct bio_vec){ }; + return mp_bvec_iter_bvec(rq->bio->bi_integrity->bip_vec, + rq->bio->bi_integrity->bip_iter); } #else /* CONFIG_BLK_DEV_INTEGRITY */ static inline int blk_rq_count_integrity_sg(struct request_queue *q, @@ -179,7 +180,8 @@ static inline int blk_integrity_rq(struc static inline struct bio_vec *rq_integrity_vec(struct request *rq) { - return NULL; + /* the optimizer will remove all calls to this function */ + return (struct bio_vec){ }; } #endif /* CONFIG_BLK_DEV_INTEGRITY */ #endif /* _LINUX_BLK_INTEGRITY_H */ From patchwork Thu May 23 16:57:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mikulas Patocka X-Patchwork-Id: 13672068 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ED57E374C6 for ; 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Signed-off-by: Mikulas Patocka --- drivers/md/dm-crypt.c | 53 ++++++++++++++++++++++++++++---------------------- 1 file changed, 30 insertions(+), 23 deletions(-) Index: linux-2.6/drivers/md/dm-crypt.c =================================================================== --- linux-2.6.orig/drivers/md/dm-crypt.c +++ linux-2.6/drivers/md/dm-crypt.c @@ -211,7 +211,8 @@ struct crypt_config { unsigned int integrity_tag_size; unsigned int integrity_iv_size; - unsigned int on_disk_tag_size; + unsigned int used_tag_size; + unsigned int tuple_size; /* * pool for per bio private data, crypto requests, @@ -1148,14 +1149,14 @@ static int dm_crypt_integrity_io_alloc(s unsigned int tag_len; int ret; - if (!bio_sectors(bio) || !io->cc->on_disk_tag_size) + if (!bio_sectors(bio) || !io->cc->tuple_size) return 0; bip = bio_integrity_alloc(bio, GFP_NOIO, 1); if (IS_ERR(bip)) return PTR_ERR(bip); - tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift); + tag_len = io->cc->tuple_size * (bio_sectors(bio) >> io->cc->sector_shift); bip->bip_iter.bi_sector = io->cc->start + io->sector; @@ -1173,24 +1174,30 @@ static int crypt_integrity_ctr(struct cr struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); struct mapped_device *md = dm_table_get_md(ti->table); + if (!bi) { + ti->error = "No integrity profile."; + return -EINVAL; + } + /* From now we require underlying device with our integrity profile */ - if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) { + if (strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG") && + strcasecmp(bi->profile->name, "nop")) { ti->error = "Integrity profile not supported."; return -EINVAL; } - if (bi->tag_size != cc->on_disk_tag_size || - bi->tuple_size != cc->on_disk_tag_size) { + if (bi->tuple_size < cc->used_tag_size) { ti->error = "Integrity profile tag size mismatch."; return -EINVAL; } + cc->tuple_size = bi->tuple_size; if (1 << bi->interval_exp != cc->sector_size) { ti->error = "Integrity profile sector size mismatch."; return -EINVAL; } if (crypt_integrity_aead(cc)) { - cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size; + cc->integrity_tag_size = cc->used_tag_size - cc->integrity_iv_size; DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md), cc->integrity_tag_size, cc->integrity_iv_size); @@ -1202,7 +1209,7 @@ static int crypt_integrity_ctr(struct cr DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md), cc->integrity_iv_size); - if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) { + if ((cc->integrity_tag_size + cc->integrity_iv_size) > cc->tuple_size) { ti->error = "Not enough space for integrity tag in the profile."; return -EINVAL; } @@ -1281,7 +1288,7 @@ static void *tag_from_dmreq(struct crypt struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * - cc->on_disk_tag_size]; + cc->tuple_size]; } static void *iv_tag_from_dmreq(struct crypt_config *cc, @@ -1362,9 +1369,9 @@ static int crypt_convert_block_aead(stru aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, cc->sector_size, iv); r = crypto_aead_encrypt(req); - if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size) + if (cc->integrity_tag_size + cc->integrity_iv_size != cc->tuple_size) memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, - cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size)); + cc->tuple_size - (cc->integrity_tag_size + cc->integrity_iv_size)); } else { aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, cc->sector_size + cc->integrity_tag_size, iv); @@ -1794,7 +1801,7 @@ static void crypt_dec_pending(struct dm_ return; if (likely(!io->ctx.aead_recheck) && unlikely(io->ctx.aead_failed) && - cc->on_disk_tag_size && bio_data_dir(base_bio) == READ) { + cc->used_tag_size && bio_data_dir(base_bio) == READ) { io->ctx.aead_recheck = true; io->ctx.aead_failed = false; io->error = 0; @@ -3173,7 +3180,7 @@ static int crypt_ctr_optional(struct dm_ ti->error = "Invalid integrity arguments"; return -EINVAL; } - cc->on_disk_tag_size = val; + cc->used_tag_size = val; sval = strchr(opt_string + strlen("integrity:"), ':') + 1; if (!strcasecmp(sval, "aead")) { set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); @@ -3384,12 +3391,12 @@ static int crypt_ctr(struct dm_target *t if (ret) goto bad; - cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size; + cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->tuple_size; if (!cc->tag_pool_max_sectors) cc->tag_pool_max_sectors = 1; ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS, - cc->tag_pool_max_sectors * cc->on_disk_tag_size); + cc->tag_pool_max_sectors * cc->tuple_size); if (ret) { ti->error = "Cannot allocate integrity tags mempool"; goto bad; @@ -3464,7 +3471,7 @@ static int crypt_map(struct dm_target *t * Check if bio is too large, split as needed. */ if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_VECS << PAGE_SHIFT)) && - (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size)) + (bio_data_dir(bio) == WRITE || cc->used_tag_size)) dm_accept_partial_bio(bio, ((BIO_MAX_VECS << PAGE_SHIFT) >> SECTOR_SHIFT)); /* @@ -3480,8 +3487,8 @@ static int crypt_map(struct dm_target *t io = dm_per_bio_data(bio, cc->per_bio_data_size); crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); - if (cc->on_disk_tag_size) { - unsigned int tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift); + if (cc->tuple_size) { + unsigned int tag_len = cc->tuple_size * (bio_sectors(bio) >> cc->sector_shift); if (unlikely(tag_len > KMALLOC_MAX_SIZE)) io->integrity_metadata = NULL; @@ -3552,7 +3559,7 @@ static void crypt_status(struct dm_targe num_feature_args += test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT); num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); - if (cc->on_disk_tag_size) + if (cc->used_tag_size) num_feature_args++; if (num_feature_args) { DMEMIT(" %d", num_feature_args); @@ -3566,8 +3573,8 @@ static void crypt_status(struct dm_targe DMEMIT(" no_read_workqueue"); if (test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) DMEMIT(" no_write_workqueue"); - if (cc->on_disk_tag_size) - DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth); + if (cc->used_tag_size) + DMEMIT(" integrity:%u:%s", cc->used_tag_size, cc->cipher_auth); if (cc->sector_size != (1 << SECTOR_SHIFT)) DMEMIT(" sector_size:%d", cc->sector_size); if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) @@ -3588,9 +3595,9 @@ static void crypt_status(struct dm_targe DMEMIT(",iv_large_sectors=%c", test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags) ? 'y' : 'n'); - if (cc->on_disk_tag_size) + if (cc->used_tag_size) DMEMIT(",integrity_tag_size=%u,cipher_auth=%s", - cc->on_disk_tag_size, cc->cipher_auth); + cc->used_tag_size, cc->cipher_auth); if (cc->sector_size != (1 << SECTOR_SHIFT)) DMEMIT(",sector_size=%d", cc->sector_size); if (cc->cipher_string)