From patchwork Tue Jul 27 05:56:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 486809 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=-16.7 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 C5F34C4320A for ; Tue, 27 Jul 2021 06:06:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A552C6113C for ; Tue, 27 Jul 2021 06:06:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235386AbhG0GGr (ORCPT ); Tue, 27 Jul 2021 02:06:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235063AbhG0GGq (ORCPT ); Tue, 27 Jul 2021 02:06:46 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B8F5C061757; Mon, 26 Jul 2021 23:06:45 -0700 (PDT) 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=fc5Ez34sLZNxmKMDItn0C4JoYtAi+tB+FjEbXFXGhDM=; b=qgWPpEvvWAHA6FZ0f6gF6ITeDo xUdoG7Af4Q0gsCS5jkWcgnJ+Z+cb+JPr4iKtpX86jrIz1LPuRuVSQ93BfoOEoYzFIuEzGUwsAnRBm p3SGmsGWNkj0J4QhGK34aSrtsaB1D32A3LVqo2/tQa4/CFUeajWc+P1uUWlCa3qYZCJu/EuLBcWrO 9m3a2OmEm8lha2nr337QOLHzfRteKvZzV2BwYPRp6CUROrjALn2Tg0P5SIYuN2J34EsLtl3bes+/o i8rZWlcfyN+2kEfKbD8P2H263iOTIjBNnO4usHBC/opG0JhaMeY8zYnbJ2nLad/at4xEq0C3Djm3Z OwJmp+/w==; Received: from [2001:4bb8:184:87c5:b7fb:1299:a9e5:ff56] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1m8GAm-00EieV-Rz; Tue, 27 Jul 2021 06:03:10 +0000 From: Christoph Hellwig To: Jens Axboe , Thomas Gleixner Cc: Thomas Bogendoerfer , Andrew Morton , Geoff Levand , Ilya Dryomov , Dongsheng Yang , Mike Snitzer , "James E.J. Bottomley" , Ira Weiny , dm-devel@redhat.com, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, ceph-devel@vger.kernel.org, linux-arch@vger.kernel.org, Chaitanya Kulkarni , "Martin K . Petersen" Subject: [PATCH 04/15] bvec: add memcpy_{from, to}_bvec and memzero_bvec helper Date: Tue, 27 Jul 2021 07:56:35 +0200 Message-Id: <20210727055646.118787-5-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727055646.118787-1-hch@lst.de> References: <20210727055646.118787-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Add helpers to perform common memory operation on a bvec. Signed-off-by: Christoph Hellwig Reviewed-by: Chaitanya Kulkarni Reviewed-by: Martin K. Petersen Reviewed-by: Ira Weiny --- include/linux/bvec.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/include/linux/bvec.h b/include/linux/bvec.h index f8710af18eef..f9fa43b940ff 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -196,4 +196,37 @@ static inline void *bvec_kmap_local(struct bio_vec *bvec) return kmap_local_page(bvec->bv_page) + bvec->bv_offset; } +/** + * memcpy_from_bvec - copy data from a bvec + * @bvec: bvec to copy from + * + * Must be called on single-page bvecs only. + */ +static inline void memcpy_from_bvec(char *to, struct bio_vec *bvec) +{ + memcpy_from_page(to, bvec->bv_page, bvec->bv_offset, bvec->bv_len); +} + +/** + * memcpy_to_bvec - copy data to a bvec + * @bvec: bvec to copy to + * + * Must be called on single-page bvecs only. + */ +static inline void memcpy_to_bvec(struct bio_vec *bvec, const char *from) +{ + memcpy_to_page(bvec->bv_page, bvec->bv_offset, from, bvec->bv_len); +} + +/** + * memzero_bvec - zero all data in a bvec + * @bvec: bvec to zero + * + * Must be called on single-page bvecs only. + */ +static inline void memzero_bvec(struct bio_vec *bvec) +{ + memzero_page(bvec->bv_page, bvec->bv_offset, bvec->bv_len); +} + #endif /* __LINUX_BVEC_H */