Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934145AbdC3NwC (ORCPT ); Thu, 30 Mar 2017 09:52:02 -0400 Received: from mail-lf0-f66.google.com ([209.85.215.66]:34459 "EHLO mail-lf0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933002AbdC3Nts (ORCPT ); Thu, 30 Mar 2017 09:49:48 -0400 From: Dmitry Monakhov To: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, martin.petersen@oracle.com Cc: Dmitry Monakhov Subject: [PATCH 3/8] bio-integrity: save original iterator for verify stage Date: Thu, 30 Mar 2017 17:49:31 +0400 Message-Id: <1490881776-28735-4-git-send-email-dmonakhov@openvz.org> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1490881776-28735-1-git-send-email-dmonakhov@openvz.org> References: <1490881776-28735-1-git-send-email-dmonakhov@openvz.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2112 Lines: 63 In order to perform verification we need to know original data vector But, after bio traverse io-stack it may be advanced, splited and relocated many times so it is hard to guess original data vector. In fact currently ->verify_fn not woks at all because at the moment it is called bio->bi_iter.bi_size == 0 The simplest way to fix that is to save original data vector and treat is as immutable. Signed-off-by: Dmitry Monakhov --- block/bio-integrity.c | 6 ++++-- include/linux/bio.h | 1 + 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/block/bio-integrity.c b/block/bio-integrity.c index b5009a8..43a4476 100644 --- a/block/bio-integrity.c +++ b/block/bio-integrity.c @@ -238,10 +238,10 @@ static int bio_integrity_process(struct bio *bio, iter.disk_name = bio->bi_bdev->bd_disk->disk_name; iter.interval = 1 << bi->interval_exp; - iter.seed = bip_get_seed(bip); + iter.seed = bip->bip_verify_iter.bi_sector; iter.prot_buf = prot_buf; - bio_for_each_segment(bv, bio, bviter) { + __bio_for_each_segment(bv, bio, bviter, bip->bip_verify_iter) { void *kaddr = kmap_atomic(bv.bv_page); iter.data_buf = kaddr + bv.bv_offset; @@ -310,6 +310,7 @@ int bio_integrity_prep(struct bio *bio) bip->bip_flags |= BIP_BLOCK_INTEGRITY; bip->bip_iter.bi_size = len; bip_set_seed(bip, bio->bi_iter.bi_sector); + bip->bip_verify_iter = bio->bi_iter; if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM) bip->bip_flags |= BIP_IP_CHECKSUM; @@ -476,6 +477,7 @@ int bio_integrity_clone(struct bio *bio, struct bio *bio_src, bip->bip_vcnt = bip_src->bip_vcnt; bip->bip_iter = bip_src->bip_iter; + bip->bip_verify_iter = bip_src->bip_verify_iter; return 0; } diff --git a/include/linux/bio.h b/include/linux/bio.h index 8e52119..00b086a 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -308,6 +308,7 @@ struct bio_integrity_payload { struct bio *bip_bio; /* parent bio */ struct bvec_iter bip_iter; + struct bvec_iter bip_verify_iter;/* saved orig data iterator */ bio_end_io_t *bip_end_io; /* saved I/O completion fn */ -- 2.9.3