From patchwork Thu Jul 15 03:36:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 12378793 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 806CFC07E96 for ; Thu, 15 Jul 2021 04:50:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2C7456127C for ; Thu, 15 Jul 2021 04:50:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2C7456127C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 8125A8D0061; Thu, 15 Jul 2021 00:50:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7E8FB8D004B; Thu, 15 Jul 2021 00:50:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6B08D8D0061; Thu, 15 Jul 2021 00:50:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0122.hostedemail.com [216.40.44.122]) by kanga.kvack.org (Postfix) with ESMTP id 47DD98D004B for ; Thu, 15 Jul 2021 00:50:06 -0400 (EDT) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 3D59B235CC for ; Thu, 15 Jul 2021 04:50:05 +0000 (UTC) X-FDA: 78363595170.10.7119864 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf01.hostedemail.com (Postfix) with ESMTP id EF0095012D76 for ; Thu, 15 Jul 2021 04:50:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=nR2oa5e93nFAI2YDNXg5bh3xw6tIvBeN/m4O0bgKbkg=; b=Jw7RSMUHmstQ0QgkqASbq5J0yi jjJWrPgUdm4Ls0Qw3rWSdBATQyFfZy1twlES6IgCkYfga9AsDpdum2+4FFRDeSEtrl1/udjOpR+Vs gPKfe/ddO56BwwWwxXpYy/TROoslQgTIwXioHWsCZW2Jk1Jk3L9tFJekJGQxy2UySBg/qdJkhsH8L poHi/vo9fjXxeehKZphi1dS8tQ+gt8to8vSUK/jLqcy9/NVcM+Sl0M3NQvk1nKnplMO/XVtiFUZ7E QZghEvsPdF7yoKCLDlGs5qP0bjk1qxl/tTzCnQq+za+x97/aZVlqFd4lLG1ghbujhEF6zrMZCaYqR 7xZfWZ+w==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1m3tIj-002yn6-2I; Thu, 15 Jul 2021 04:49:00 +0000 From: "Matthew Wilcox (Oracle)" To: linux-kernel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v14 091/138] block: Add bio_for_each_folio_all() Date: Thu, 15 Jul 2021 04:36:17 +0100 Message-Id: <20210715033704.692967-92-willy@infradead.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210715033704.692967-1-willy@infradead.org> References: <20210715033704.692967-1-willy@infradead.org> MIME-Version: 1.0 Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=Jw7RSMUH; spf=none (imf01.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: EF0095012D76 X-Stat-Signature: 3mayo3fu41n4mwf1sqx43wbe7tfj4b5z X-HE-Tag: 1626324604-884123 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Allow callers to iterate over each folio instead of each page. The bio need not have been constructed using folios originally. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/bio.h | 43 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-) diff --git a/include/linux/bio.h b/include/linux/bio.h index ade93e2de6a1..d462bbc95c4b 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -189,7 +189,7 @@ static inline void bio_advance_iter_single(const struct bio *bio, */ #define bio_for_each_bvec_all(bvl, bio, i) \ for (i = 0, bvl = bio_first_bvec_all(bio); \ - i < (bio)->bi_vcnt; i++, bvl++) \ + i < (bio)->bi_vcnt; i++, bvl++) #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) @@ -314,6 +314,47 @@ static inline struct bio_vec *bio_last_bvec_all(struct bio *bio) return &bio->bi_io_vec[bio->bi_vcnt - 1]; } +struct folio_iter { + struct folio *folio; + size_t offset; + size_t length; + size_t _seg_count; + int _i; +}; + +static inline +void bio_first_folio(struct folio_iter *fi, struct bio *bio, int i) +{ + struct bio_vec *bvec = bio_first_bvec_all(bio) + i; + + fi->folio = page_folio(bvec->bv_page); + fi->offset = bvec->bv_offset + + PAGE_SIZE * (bvec->bv_page - &fi->folio->page); + fi->_seg_count = bvec->bv_len; + fi->length = min(folio_size(fi->folio) - fi->offset, fi->_seg_count); + fi->_i = i; +} + +static inline void bio_next_folio(struct folio_iter *fi, struct bio *bio) +{ + fi->_seg_count -= fi->length; + if (fi->_seg_count) { + fi->folio = folio_next(fi->folio); + fi->offset = 0; + fi->length = min(folio_size(fi->folio), fi->_seg_count); + } else if (fi->_i + 1 < bio->bi_vcnt) { + bio_first_folio(fi, bio, fi->_i + 1); + } else { + fi->folio = NULL; + } +} + +/* + * Iterate over each folio in a bio. + */ +#define bio_for_each_folio_all(fi, bio) \ + for (bio_first_folio(&fi, bio, 0); fi.folio; bio_next_folio(&fi, bio)) + enum bip_flags { BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */