From patchwork Tue Mar 14 06:16:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13173724 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 456EEC7618B for ; Tue, 14 Mar 2023 06:17:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229545AbjCNGRV (ORCPT ); Tue, 14 Mar 2023 02:17:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51570 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229715AbjCNGRT (ORCPT ); Tue, 14 Mar 2023 02:17:19 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0617D77CB4 for ; Mon, 13 Mar 2023 23:17:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=lrY+PNA3btVfKte69b4KeQJJK32O3tPdJYJ3+Hjc2AU=; b=26KgqLdXU6ccBZn3eScQUwcX2Q FwtLx2WmbAfCdHlIusLYDLD/z7sJiMxwqmDfUKpVeZ15laGXmtJojtDMc2a/8Vlib3m0QulB6uHXn xQVf4/C27uRZQrHPNekWn51g5jJ6hfCyVqwcv1Jhek2uMfDbWM/n3zkqQF5M2KVOrHBFi3m6yGVe7 +62RUFoXIoIu1/kTWMeGj7mIzPTzGoxoVnNMDCZ3wnLDYFTq6dYVwnkD78TWDiw0PRRvw7IjJPNyz X2bUsq5F9zaRQjTH4SCx/TAD+cXP4UIHa2Jy38sHlYl3BJifRrRKUKAycYWaQy7am/nsCoRe89dJu Jxr6sRkg==; Received: from 2a02-8389-2341-5b80-39d3-4735-9a3c-88d8.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:39d3:4735:9a3c:88d8] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pbxyF-009Aiu-Q1; Tue, 14 Mar 2023 06:17:16 +0000 From: Christoph Hellwig To: Chris Mason , Josef Bacik , David Sterba Cc: linux-btrfs@vger.kernel.org, Johannes Thumshirn , Qu Wenruo Subject: [PATCH 06/21] btrfs: simplify extent buffer reading Date: Tue, 14 Mar 2023 07:16:40 +0100 Message-Id: <20230314061655.245340-7-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230314061655.245340-1-hch@lst.de> References: <20230314061655.245340-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org The btrfs_bio_ctrl machinery is overkill for reading extent_buffers as we always operate on PAGE SIZE chunks (or one smaller one for the subpage case) that are contigous and are guaranteed to fit into a single bio. Replace it with open coded btrfs_bio_alloc, __bio_add_page and btrfs_submit_bio calls in a helper function shared between the subpage and node size >= PAGE_SIZE cases. Signed-off-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn Reviewed-by: Qu Wenruo --- fs/btrfs/extent_io.c | 99 ++++++++++++++++---------------------------- 1 file changed, 36 insertions(+), 63 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index e7a0ef6d70bfe1..8e709b44fa57ec 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -98,22 +98,12 @@ void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info) */ struct btrfs_bio_ctrl { struct btrfs_bio *bbio; - int mirror_num; enum btrfs_compression_type compress_type; u32 len_to_oe_boundary; blk_opf_t opf; btrfs_bio_end_io_t end_io_func; struct writeback_control *wbc; - /* - * This is for metadata read, to provide the extra needed verification - * info. This has to be provided for submit_one_bio(), as - * submit_one_bio() can submit a bio if it ends at stripe boundary. If - * no such parent_check is provided, the metadata can hit false alert at - * endio time. - */ - struct btrfs_tree_parent_check *parent_check; - /* * Tell writepage not to lock the state bits for this range, it still * does the unlocking. @@ -124,7 +114,6 @@ struct btrfs_bio_ctrl { static void submit_one_bio(struct btrfs_bio_ctrl *bio_ctrl) { struct btrfs_bio *bbio = bio_ctrl->bbio; - int mirror_num = bio_ctrl->mirror_num; if (!bbio) return; @@ -132,25 +121,14 @@ static void submit_one_bio(struct btrfs_bio_ctrl *bio_ctrl) /* Caller should ensure the bio has at least some range added */ ASSERT(bbio->bio.bi_iter.bi_size); - if (!is_data_inode(&bbio->inode->vfs_inode)) { - if (btrfs_op(&bbio->bio) != BTRFS_MAP_WRITE) { - /* - * For metadata read, we should have the parent_check, - * and copy it to bbio for metadata verification. - */ - ASSERT(bio_ctrl->parent_check); - memcpy(&bbio->parent_check, - bio_ctrl->parent_check, - sizeof(struct btrfs_tree_parent_check)); - } + if (!is_data_inode(&bbio->inode->vfs_inode)) bbio->bio.bi_opf |= REQ_META; - } if (btrfs_op(&bbio->bio) == BTRFS_MAP_READ && bio_ctrl->compress_type != BTRFS_COMPRESS_NONE) - btrfs_submit_compressed_read(bbio, mirror_num); + btrfs_submit_compressed_read(bbio, 0); else - btrfs_submit_bio(bbio, mirror_num); + btrfs_submit_bio(bbio, 0); /* The bbio is owned by the end_io handler now */ bio_ctrl->bbio = NULL; @@ -4242,6 +4220,36 @@ void set_extent_buffer_uptodate(struct extent_buffer *eb) } } +static void __read_extent_buffer_pages(struct extent_buffer *eb, int mirror_num, + struct btrfs_tree_parent_check *check) +{ + int num_pages = num_extent_pages(eb), i; + struct btrfs_bio *bbio; + + clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); + eb->read_mirror = 0; + atomic_set(&eb->io_pages, num_pages); + check_buffer_tree_ref(eb); + + bbio = btrfs_bio_alloc(INLINE_EXTENT_BUFFER_PAGES, + REQ_OP_READ | REQ_META, + BTRFS_I(eb->fs_info->btree_inode), + end_bio_extent_readpage, NULL); + bbio->bio.bi_iter.bi_sector = eb->start >> SECTOR_SHIFT; + bbio->file_offset = eb->start; + memcpy(&bbio->parent_check, check, sizeof(*check)); + if (eb->fs_info->nodesize < PAGE_SIZE) { + __bio_add_page(&bbio->bio, eb->pages[0], eb->len, + eb->start - page_offset(eb->pages[0])); + } else { + for (i = 0; i < num_pages; i++) { + ClearPageError(eb->pages[i]); + __bio_add_page(&bbio->bio, eb->pages[i], PAGE_SIZE, 0); + } + } + btrfs_submit_bio(bbio, mirror_num); +} + static int read_extent_buffer_subpage(struct extent_buffer *eb, int wait, int mirror_num, struct btrfs_tree_parent_check *check) @@ -4250,11 +4258,6 @@ static int read_extent_buffer_subpage(struct extent_buffer *eb, int wait, struct extent_io_tree *io_tree; struct page *page = eb->pages[0]; struct extent_state *cached_state = NULL; - struct btrfs_bio_ctrl bio_ctrl = { - .opf = REQ_OP_READ, - .mirror_num = mirror_num, - .parent_check = check, - }; int ret; ASSERT(!test_bit(EXTENT_BUFFER_UNMAPPED, &eb->bflags)); @@ -4282,18 +4285,10 @@ static int read_extent_buffer_subpage(struct extent_buffer *eb, int wait, return 0; } - clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); - eb->read_mirror = 0; - atomic_set(&eb->io_pages, 1); - check_buffer_tree_ref(eb); - bio_ctrl.end_io_func = end_bio_extent_readpage; - btrfs_subpage_clear_error(fs_info, page, eb->start, eb->len); - btrfs_subpage_start_reader(fs_info, page, eb->start, eb->len); - submit_extent_page(&bio_ctrl, eb->start, page, eb->len, - eb->start - page_offset(page)); - submit_one_bio(&bio_ctrl); + + __read_extent_buffer_pages(eb, mirror_num, check); if (wait != WAIT_COMPLETE) { free_extent_state(cached_state); return 0; @@ -4314,11 +4309,6 @@ int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num, int locked_pages = 0; int all_uptodate = 1; int num_pages; - struct btrfs_bio_ctrl bio_ctrl = { - .opf = REQ_OP_READ, - .mirror_num = mirror_num, - .parent_check = check, - }; if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) return 0; @@ -4368,24 +4358,7 @@ int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num, goto unlock_exit; } - clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); - eb->read_mirror = 0; - atomic_set(&eb->io_pages, num_pages); - /* - * It is possible for release_folio to clear the TREE_REF bit before we - * set io_pages. See check_buffer_tree_ref for a more detailed comment. - */ - check_buffer_tree_ref(eb); - bio_ctrl.end_io_func = end_bio_extent_readpage; - for (i = 0; i < num_pages; i++) { - page = eb->pages[i]; - - ClearPageError(page); - submit_extent_page(&bio_ctrl, page_offset(page), page, - PAGE_SIZE, 0); - } - - submit_one_bio(&bio_ctrl); + __read_extent_buffer_pages(eb, mirror_num, check); if (wait != WAIT_COMPLETE) return 0;