From patchwork Tue Aug 17 21:06:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 12441975 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=ham 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 173C1C43216 for ; Tue, 17 Aug 2021 21:07:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F2FDA60FE6 for ; Tue, 17 Aug 2021 21:07:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234188AbhHQVHv (ORCPT ); Tue, 17 Aug 2021 17:07:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35402 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234116AbhHQVHu (ORCPT ); Tue, 17 Aug 2021 17:07:50 -0400 Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 06058C061764 for ; Tue, 17 Aug 2021 14:07:17 -0700 (PDT) Received: by mail-pj1-x1030.google.com with SMTP id w13-20020a17090aea0db029017897a5f7bcso855386pjy.5 for ; Tue, 17 Aug 2021 14:07:17 -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=fXYmNWwpxS5pmeI/w6IOPGgM3crpcSAOwPC+6qJpxHs=; b=JlMW2+KFaP15NoNb48hv2YzE7Bi5wydCTaZZEg1tC4MFaNWAcr7DabIzxsM1kLn4rP WOgWaR7MLtXLHk46fYT7BZ4k2WCYNCbVRAeQw5ameFDURrxEZ788wiNd3yc4NcoA2Vtl hqnLlqjCMNZ5bsFwG0iDnV69QzDBDBVMXCEVWqnztrHEiHO16f7zwAkzFlf4tQfhkhK2 /pX1TfdmxeeZ/HwYSZ9szr5LWEogyQXi7vsDIyj5WhZeLmAL6DYZAMtTsUljXEMTCqtK b+tYFXTzIjC08FhvfKX+pD2W+qJ6s1FgW9QnUQGwgMxF1ldx+jHGPo0FcF2jMoilrfqV telQ== 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=fXYmNWwpxS5pmeI/w6IOPGgM3crpcSAOwPC+6qJpxHs=; b=HeMmr+Avfp6alt4SZa6gowhq3+Jk1s8ip4gvbK0niH3IcaZJLT8Xp7Tec9ogyCKCor mR2huQUUw/nOZtXDTMc7zMOvcPZJ+elUwrZeZpNRVAjfOM6Fx38dqBoiSNc9gctJKBbV EtA+jP1oU2tDX05H2Ev4kno3YOH5a0Z4mlpshv+4yXTzRHgHDatqoSb6zJuRDCxfQ8KU gGJv4pr3n1hxGLGlhHnawFbJFnwx91WZBHNqznJCb0dn/+3NQ/b6qqcZAKak3jxTpImm Euw2wfDUmbtc1wClWtySl3QG1MOfNQha4A4fe5wzUo8VGVFvgFBdLRItDSz34tz01HrF lPQw== X-Gm-Message-State: AOAM5327tg7OwoIUTrYEQo84bBfPMAMPBKzBoPUzjjnwQBwUJjo0FGmu 8dRCky7jnMGdsuMB6ZFvkPZyUQ== X-Google-Smtp-Source: ABdhPJwuLiCzLL1PylKwXrCez42uhiqHj77MXm0TJjd7AphPYhkN0h7txM9f/hQckRFJTYtUeCQeGw== X-Received: by 2002:a17:90a:9511:: with SMTP id t17mr5599888pjo.194.1629234436501; Tue, 17 Aug 2021 14:07:16 -0700 (PDT) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:df70]) by smtp.gmail.com with ESMTPSA id c9sm4205194pgq.58.2021.08.17.14.07.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 14:07:15 -0700 (PDT) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: kernel-team@fb.com, linux-fsdevel@vger.kernel.org, Al Viro , Linus Torvalds , linux-api@vger.kernel.org Subject: [PATCH v10 03/14] btrfs: don't advance offset for compressed bios in btrfs_csum_one_bio() Date: Tue, 17 Aug 2021 14:06:35 -0700 Message-Id: <5cbd7b12d5147d7d619a5f521051e5c4ed5ce6d1.1629234193.git.osandov@fb.com> X-Mailer: git-send-email 2.32.0 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 7869ad12bc6e..e645b3c2f09a 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -480,7 +480,8 @@ 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 */ } @@ -516,7 +517,7 @@ 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 f07c82fafa04..be245b4b8efe 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3111,7 +3111,7 @@ 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 2673c6ba7a4e..844fae923340 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -614,28 +614,28 @@ 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 contain potentially discontiguous 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(); @@ -649,18 +649,13 @@ 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) { @@ -668,13 +663,14 @@ 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; @@ -705,7 +701,8 @@ 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 2aa9646bce56..abee704fc468 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2286,7 +2286,7 @@ 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); } /* @@ -2538,7 +2538,7 @@ 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; } @@ -8136,7 +8136,7 @@ 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) @@ -8195,7 +8195,7 @@ 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 {