From patchwork Fri May 12 13:39:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "hch@lst.de" X-Patchwork-Id: 13239322 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 EED66C7EE26 for ; Fri, 12 May 2023 13:39:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241299AbjELNjX (ORCPT ); Fri, 12 May 2023 09:39:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52752 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241304AbjELNjS (ORCPT ); Fri, 12 May 2023 09:39:18 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 93BAD12087 for ; Fri, 12 May 2023 06:39:16 -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=ptNyRjDsDOWi2id8Bfmz/XxKVOPHn5T4DqKTnkNcIdY=; b=xH7+9YipqXh3MrTjs+w8pl6zG1 kPgdfQGI/Bdwy9BJ/nWo7N8GsqEIDQvBjn9+Ig1PYMaCtYmYYhUZmt27uUQGD2r7vphYJ0W2xPn6W Qwxy4j9/hgxeyadhqURMCg/m76yFJhDido1tt4HeRDcBN7igvYh7E4BjIDzUV+YsYpFyR1CHn779J xtkkqlTsiPCWcvsFm+Uke2majQrkb/p7ZPmS5sNXWVJNvIYIwvTGuzHeSlLvklaip0UtEMzxrmNQX A6WOJmsiv7aJhVwdnWQyquaGIC0lR4g8c+BA51x+rNNrXToqo5vV+zzHZnUmyMAnCa/HyJTJsLdTA 0jeGY3/w==; Received: from [204.239.251.3] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1pxSzL-00C2iY-26; Fri, 12 May 2023 13:39:15 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Jinyoung Choi , linux-block@vger.kernel.org Subject: [PATCH 7/8] block: move the bi_size update out of __bio_try_merge_page Date: Fri, 12 May 2023 06:39:00 -0700 Message-Id: <20230512133901.1053543-8-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230512133901.1053543-1-hch@lst.de> References: <20230512133901.1053543-1-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-block@vger.kernel.org The update of bi_size is the only thing in __bio_try_merge_page that needs a bio. Move it to the callers, and merge __bio_try_merge_page and page_is_mergeable into a single bvec_try_merge_page that only takes the current bvec instead of a full bio. This will allow reusing this function for supporting multi-page integrity payload bvecs. Signed-off-by: Christoph Hellwig Reviewed-by: Jinyoung Choi --- block/bio.c | 57 +++++++++++++++++++---------------------------------- 1 file changed, 20 insertions(+), 37 deletions(-) diff --git a/block/bio.c b/block/bio.c index 89b1475de0c370..106009707ca1c5 100644 --- a/block/bio.c +++ b/block/bio.c @@ -903,9 +903,8 @@ static inline bool bio_full(struct bio *bio, unsigned len) return false; } -static inline bool page_is_mergeable(const struct bio_vec *bv, - struct page *page, unsigned int len, unsigned int off, - bool *same_page) +static bool bvec_try_merge_page(struct bio_vec *bv, struct page *page, + unsigned int len, unsigned int off, bool *same_page) { size_t bv_end = bv->bv_offset + bv->bv_len; phys_addr_t vec_end_addr = page_to_phys(bv->bv_page) + bv_end - 1; @@ -919,38 +918,14 @@ static inline bool page_is_mergeable(const struct bio_vec *bv, return false; *same_page = ((vec_end_addr & PAGE_MASK) == page_addr); - if (*same_page) - return true; - else if (IS_ENABLED(CONFIG_KMSAN)) - return false; - return (bv->bv_page + bv_end / PAGE_SIZE) == (page + off / PAGE_SIZE); -} - -/** - * __bio_try_merge_page - try appending data to an existing bvec. - * @bio: destination bio - * @page: start page to add - * @len: length of the data to add - * @off: offset of the data relative to @page - * @same_page: return if the segment has been merged inside the same page - * - * Try to add the data at @page + @off to the last bvec of @bio. This is a - * useful optimisation for file systems with a block size smaller than the - * page size. - * - * Warn if (@len, @off) crosses pages in case that @same_page is true. - * - * Return %true on success or %false on failure. - */ -static bool __bio_try_merge_page(struct bio *bio, struct page *page, - unsigned int len, unsigned int off, bool *same_page) -{ - struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt - 1]; + if (!*same_page) { + if (IS_ENABLED(CONFIG_KMSAN)) + return false; + if (bv->bv_page + bv_end / PAGE_SIZE != page + off / PAGE_SIZE) + return false; + } - if (!page_is_mergeable(bv, page, len, off, same_page)) - return false; bv->bv_len += len; - bio->bi_iter.bi_size += len; return true; } @@ -972,7 +947,7 @@ static bool bio_try_merge_hw_seg(struct request_queue *q, struct bio *bio, return false; if (bv->bv_len + len > queue_max_segment_size(q)) return false; - return __bio_try_merge_page(bio, page, len, offset, same_page); + return bvec_try_merge_page(bv, page, len, offset, same_page); } /** @@ -1001,8 +976,11 @@ int bio_add_hw_page(struct request_queue *q, struct bio *bio, return 0; if (bio->bi_vcnt > 0) { - if (bio_try_merge_hw_seg(q, bio, page, len, offset, same_page)) + if (bio_try_merge_hw_seg(q, bio, page, len, offset, + same_page)) { + bio->bi_iter.bi_size += len; return len; + } if (bio->bi_vcnt >= min(bio->bi_max_vecs, queue_max_segments(q))) @@ -1123,8 +1101,11 @@ int bio_add_page(struct bio *bio, struct page *page, return 0; if (bio->bi_vcnt > 0 && - __bio_try_merge_page(bio, page, len, offset, &same_page)) + bvec_try_merge_page(&bio->bi_io_vec[bio->bi_vcnt - 1], + page, len, offset, &same_page)) { + bio->bi_iter.bi_size += len; return len; + } if (bio->bi_vcnt >= bio->bi_max_vecs) return 0; @@ -1199,7 +1180,9 @@ static int bio_iov_add_page(struct bio *bio, struct page *page, return -EIO; if (bio->bi_vcnt > 0 && - __bio_try_merge_page(bio, page, len, offset, &same_page)) { + bvec_try_merge_page(&bio->bi_io_vec[bio->bi_vcnt - 1], + page, len, offset, &same_page)) { + bio->bi_iter.bi_size += len; if (same_page) put_page(page); return 0;