From patchwork Thu Apr 1 06:51:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 12177317 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1E4FAC4360C for ; Thu, 1 Apr 2021 06:52:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE0CE610E6 for ; Thu, 1 Apr 2021 06:52:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233395AbhDAGvm (ORCPT ); Thu, 1 Apr 2021 02:51:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233179AbhDAGvh (ORCPT ); Thu, 1 Apr 2021 02:51:37 -0400 Received: from mail-pl1-x629.google.com (mail-pl1-x629.google.com [IPv6:2607:f8b0:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2767AC0613E6 for ; Wed, 31 Mar 2021 23:51:37 -0700 (PDT) Received: by mail-pl1-x629.google.com with SMTP id h20so537680plr.4 for ; Wed, 31 Mar 2021 23:51:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osandov-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=V8uPByjtnHoUMkvJ5RUd2rRjE1zllky9RjeRMsW1NqQ=; b=dFZnhYNW9EUE9e95vA11lEaGBczSZ0qlNbDAgV+vvMjg1tBDd/fEm/OHQbkFa59S3w G8af9VZX6ApjeaEhEJqWyapEX+N/mt9cL66Zcf+hD/wZzjFRvCLylQjiXsFL2hPxg2vp JVwqpu1qoV4FOUZmBrRuKmq4i2dbYk+NXwnbQjDHxzg7dl2UxmV13vvXzfk5K8cY9+Q3 CdymHGn0auRAdfiOEuP0UeXUxfc0UAE7AsIos1AfsmKUl+/9TLidn13Amq03Qf99TnWu blSrTn0IJu4r0Zx/iFOnbBDs7DNM8vpYptOQrFx7hWrUfMOCHccqSGRGm3Ybda5gS2wH Y8nw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=V8uPByjtnHoUMkvJ5RUd2rRjE1zllky9RjeRMsW1NqQ=; b=dhLmfKTpjLepkYKhDGtORvIS4qRO0lbRjzR/UuvVwkXwqik+5f3K+wQCtPxV6oOX0I PAZHeuBu+qHTcqxDHZJv+ORIACiiXYpBvoPOf9Q5KLJ2jkQ7YC9DAYfn6upWl7vD81hE /ySP5aGaxWRtY4V9SMOQ+vidfN4QM80L4iGpchnEgKP5RLHzp4DXNCLK98rNqE0V079C iYqPl4B58+ScB2NEHEy0kUsocmgiJO7kIsUKznWMT4pAbbyc3f0qT45qGm7OCuriBKVl /W/nM4pTLJjMUktjpgUn+LUlmH5x4S+8gZQjoOEjNQxDwyPulYXN401kJ/8DkgY5DKYy jz3w== X-Gm-Message-State: AOAM530lHjixc0Xo7wb0Jg+RpIolm6HAFXFCdrF968C8s8uGpL7EUCOQ NcSPpB+xWLdHJY0EtJWvIvp/5rGXB/slPg== X-Google-Smtp-Source: ABdhPJzPDmEyXE6hDNG9gjH7oORqGG1AwjQjQcPtusPPQXSQnVzbgdXAp8IR/pYnQJSnuHQD74a3PQ== X-Received: by 2002:a17:902:b589:b029:e6:2875:aa4c with SMTP id a9-20020a170902b589b02900e62875aa4cmr6610765pls.71.1617259895896; Wed, 31 Mar 2021 23:51:35 -0700 (PDT) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:3734]) by smtp.gmail.com with ESMTPSA id kk6sm4158345pjb.51.2021.03.31.23.51.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 Mar 2021 23:51:35 -0700 (PDT) From: Omar Sandoval To: linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, Al Viro , Christoph Hellwig Cc: Linus Torvalds , Dave Chinner , Jann Horn , Amir Goldstein , Aleksa Sarai , linux-api@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v9 4/9] btrfs: don't advance offset for compressed bios in btrfs_csum_one_bio() Date: Wed, 31 Mar 2021 23:51:09 -0700 Message-Id: <0c2dc25d854d7b8cfac9bd31d9766148b45b9b1e.1617258892.git.osandov@fb.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Omar Sandoval btrfs_csum_one_bio() loops over each filesystem block in the bio while keeping a cursor of its current logical position in the file in order to look up the ordered extent to add the checksums to. However, this doesn't make much sense for compressed extents, as a sector on disk does not correspond to a sector of decompressed file data. It happens to work because 1) the compressed bio always covers one ordered extent and 2) the size of the bio is always less than the size of the ordered extent. However, the second point will not always be true for encoded writes. Let's add a boolean parameter to btrfs_csum_one_bio() to indicate that it can assume that the bio only covers one ordered extent. Since we're already changing the signature, let's get rid of the contig parameter and make it implied by the offset parameter, similar to the change we recently made to btrfs_lookup_bio_sums(). Additionally, let's rename nr_sectors to blockcount to make it clear that it's the number of filesystem blocks, not the number of 512-byte sectors. Reviewed-by: Josef Bacik Signed-off-by: Omar Sandoval --- fs/btrfs/compression.c | 5 +++-- fs/btrfs/ctree.h | 2 +- fs/btrfs/file-item.c | 35 ++++++++++++++++------------------- fs/btrfs/inode.c | 8 ++++---- 4 files changed, 24 insertions(+), 26 deletions(-) diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index 2600703fab83..5059d9888c23 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -449,7 +449,8 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start, BUG_ON(ret); /* -ENOMEM */ if (!skip_sum) { - ret = btrfs_csum_one_bio(inode, bio, start, 1); + ret = btrfs_csum_one_bio(inode, bio, start, + true); BUG_ON(ret); /* -ENOMEM */ } @@ -481,7 +482,7 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start, BUG_ON(ret); /* -ENOMEM */ if (!skip_sum) { - ret = btrfs_csum_one_bio(inode, bio, start, 1); + ret = btrfs_csum_one_bio(inode, bio, start, true); BUG_ON(ret); /* -ENOMEM */ } diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index f2fd73e58ee6..ae764f6155d5 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3050,7 +3050,7 @@ int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_ordered_sum *sums); blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio, - u64 file_start, int contig); + u64 offset, bool one_ordered); int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, struct list_head *list, int search_commit); void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode, diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index 294602f139ef..8f755ef20aaa 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -615,28 +615,28 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, * btrfs_csum_one_bio - Calculates checksums of the data contained inside a bio * @inode: Owner of the data inside the bio * @bio: Contains the data to be checksummed - * @file_start: offset in file this bio begins to describe - * @contig: Boolean. If true/1 means all bio vecs in this bio are - * contiguous and they begin at @file_start in the file. False/0 - * means this bio can contains potentially discontigous bio vecs - * so the logical offset of each should be calculated separately. + * @offset: If (u64)-1, @bio may contain discontiguous bio vecs, so the + * file offsets are determined from the page offsets in the bio. + * Otherwise, this is the starting file offset of the bio vecs in + * @bio, which must be contiguous. + * @one_ordered: If true, @bio only refers to one ordered extent. */ blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio, - u64 file_start, int contig) + u64 offset, bool one_ordered) { struct btrfs_fs_info *fs_info = inode->root->fs_info; SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); struct btrfs_ordered_sum *sums; struct btrfs_ordered_extent *ordered = NULL; + const bool page_offsets = (offset == (u64)-1); char *data; struct bvec_iter iter; struct bio_vec bvec; int index; - int nr_sectors; + int blockcount; unsigned long total_bytes = 0; unsigned long this_sum_bytes = 0; int i; - u64 offset; unsigned nofs_flag; nofs_flag = memalloc_nofs_save(); @@ -650,18 +650,13 @@ blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio, sums->len = bio->bi_iter.bi_size; INIT_LIST_HEAD(&sums->list); - if (contig) - offset = file_start; - else - offset = 0; /* shut up gcc */ - sums->bytenr = bio->bi_iter.bi_sector << 9; index = 0; shash->tfm = fs_info->csum_shash; bio_for_each_segment(bvec, bio, iter) { - if (!contig) + if (page_offsets) offset = page_offset(bvec.bv_page) + bvec.bv_offset; if (!ordered) { @@ -669,13 +664,14 @@ blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio, BUG_ON(!ordered); /* Logic error */ } - nr_sectors = BTRFS_BYTES_TO_BLKS(fs_info, + blockcount = BTRFS_BYTES_TO_BLKS(fs_info, bvec.bv_len + fs_info->sectorsize - 1); - for (i = 0; i < nr_sectors; i++) { - if (offset >= ordered->file_offset + ordered->num_bytes || - offset < ordered->file_offset) { + for (i = 0; i < blockcount; i++) { + if (!one_ordered && + (offset >= ordered->file_offset + ordered->num_bytes || + offset < ordered->file_offset)) { unsigned long bytes_left; sums->len = this_sum_bytes; @@ -706,7 +702,8 @@ blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio, sums->sums + index); kunmap_atomic(data); index += fs_info->csum_size; - offset += fs_info->sectorsize; + if (!one_ordered) + offset += fs_info->sectorsize; this_sum_bytes += fs_info->sectorsize; total_bytes += fs_info->sectorsize; } diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 1e0e20ad25e4..9d091272807a 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2235,7 +2235,7 @@ int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio, static blk_status_t btrfs_submit_bio_start(struct inode *inode, struct bio *bio, u64 dio_file_offset) { - return btrfs_csum_one_bio(BTRFS_I(inode), bio, 0, 0); + return btrfs_csum_one_bio(BTRFS_I(inode), bio, (u64)-1, false); } bool btrfs_bio_fits_in_ordered_extent(struct page *page, struct bio *bio, @@ -2425,7 +2425,7 @@ blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio, 0, btrfs_submit_bio_start); goto out; } else if (!skip_sum) { - ret = btrfs_csum_one_bio(BTRFS_I(inode), bio, 0, 0); + ret = btrfs_csum_one_bio(BTRFS_I(inode), bio, (u64)-1, false); if (ret) goto out; } @@ -7998,7 +7998,7 @@ static blk_status_t btrfs_submit_bio_start_direct_io(struct inode *inode, struct bio *bio, u64 dio_file_offset) { - return btrfs_csum_one_bio(BTRFS_I(inode), bio, dio_file_offset, 1); + return btrfs_csum_one_bio(BTRFS_I(inode), bio, dio_file_offset, false); } static void btrfs_end_dio_bio(struct bio *bio) @@ -8057,7 +8057,7 @@ static inline blk_status_t btrfs_submit_dio_bio(struct bio *bio, * If we aren't doing async submit, calculate the csum of the * bio now. */ - ret = btrfs_csum_one_bio(BTRFS_I(inode), bio, file_offset, 1); + ret = btrfs_csum_one_bio(BTRFS_I(inode), bio, file_offset, false); if (ret) goto err; } else {