From patchwork Mon Jan 18 19:35:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12028091 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 64973C433E9 for ; Mon, 18 Jan 2021 20:03:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 416D522D2A for ; Mon, 18 Jan 2021 20:03:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2437723AbhARUDT (ORCPT ); Mon, 18 Jan 2021 15:03:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41046 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2437881AbhARUCP (ORCPT ); Mon, 18 Jan 2021 15:02:15 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0984BC061573; Mon, 18 Jan 2021 12:01:29 -0800 (PST) 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=auEVqQ4zOacSI9TxWGWEHZ0yBV/Ht1F9yfenZvCalnA=; b=dPDYyqs6V+L7COqohwiVdEzWX9 7BF6t+ikCdPodDFsSHoi3PIjxMClLL/ze0Zyd2gvXKpn74lj9c/NBnu3fgtW9thj2jDgcb5zDCX1q FE7ZdBSw5W0lmnrBmNZFnvvS5A7/GRnjwwd9uF3KLgAsJZfcheL7VnXDWSCYwNfr7N3zmCxXMz1MA JFkmwPF8cBUeKXKjSwnaQmKlYmP2fJbSwYu2dPcfyFfbMixgX3euNOFx0qv8ym7i/aNYKltMF08zX o3VbC0Q1SRgOEMGQV7zKKqP41pgTsLHwwtMRTZCTA8a2KKXsEOm1xr5lIS3+vEpmVq9x6Zjc/19BC Qq9Gfxtg==; Received: from 089144206130.atnat0015.highway.bob.at ([89.144.206.130] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l1ahs-00DKdB-8d; Mon, 18 Jan 2021 20:01:04 +0000 From: Christoph Hellwig To: linux-xfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, avi@scylladb.com Subject: [PATCH 10/11] iomap: add a IOMAP_DIO_UNALIGNED flag Date: Mon, 18 Jan 2021 20:35:15 +0100 Message-Id: <20210118193516.2915706-11-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210118193516.2915706-1-hch@lst.de> References: <20210118193516.2915706-1-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: linux-fsdevel@vger.kernel.org Add a flag to signal an I/O that is not file system block aligned. Signed-off-by: Christoph Hellwig --- fs/iomap/direct-io.c | 7 +++++++ include/linux/iomap.h | 8 ++++++++ 2 files changed, 15 insertions(+) diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 32dbbf7dd4aadb..d93019ee4c9e3e 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -485,6 +485,13 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, iomap_flags |= IOMAP_NOWAIT; } + if (dio_flags & IOMAP_DIO_UNALIGNED) { + ret = -EAGAIN; + if (pos >= dio->i_size) + goto out_free_dio; + iomap_flags |= IOMAP_UNALIGNED; + } + ret = filemap_write_and_wait_range(mapping, pos, end); if (ret) goto out_free_dio; diff --git a/include/linux/iomap.h b/include/linux/iomap.h index b322598dc10ec0..2fa94ec9583d0a 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -122,6 +122,7 @@ struct iomap_page_ops { #define IOMAP_FAULT (1 << 3) /* mapping for page fault */ #define IOMAP_DIRECT (1 << 4) /* direct I/O */ #define IOMAP_NOWAIT (1 << 5) /* do not block */ +#define IOMAP_UNALIGNED (1 << 6) /* do not allocate blocks */ struct iomap_ops { /* @@ -262,6 +263,13 @@ struct iomap_dio_ops { */ #define IOMAP_DIO_FORCE_WAIT (1 << 0) +/* + * Direct I/O that is not aligned to the file system block. Do not allocate + * blocks and do not zero partial blocks, fall back to the caller by returning + * -EAGAIN instead. + */ +#define IOMAP_DIO_UNALIGNED (1 << 1) + ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, const struct iomap_ops *ops, const struct iomap_dio_ops *dops, unsigned int flags);