From patchwork Wed May 24 06:38:04 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: 13253318 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 9D358C7EE45 for ; Wed, 24 May 2023 06:38:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239783AbjEXGis (ORCPT ); Wed, 24 May 2023 02:38:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239734AbjEXGih (ORCPT ); Wed, 24 May 2023 02:38:37 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E0C3CA3; Tue, 23 May 2023 23:38:36 -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=zJveT6acb7t2j3iomHi3xo9Jbx75D5jbjB5CrMVejjo=; b=q6Wu9SA2gFSAIh9AiPOt14soTX 8DdCnoqFBQBu9bVMEqanr24O7/zWkWVuK1A3e4GSuOZym5FMwUCETTPqH/YxzZmXnJ60fvuu4y4Cw zSelNT1zRkORnz6HOunLGdkPo9/2iwMfyLLsa6YucU7Ax7LkK+Bxf18JLpANp7XwpxLxolfGBpyzd pEl9ELdZf8XF8Zy0Fe5jt5VYKTQvXvte0rXpg7K5/ebo7gGyug/xu0fIimIGoBr+PsNE9xIJ6abMo cu2VIUtOdIWHXchhn2Fc52BZisN7YgWLK7XyMLHJzwyCVRxere7W7z82n7/oeqEU/DTy9CVwNsr/t oK1WlLZg==; Received: from [2001:4bb8:188:23b2:cbb8:fcea:a637:5089] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1q1i8i-00CVfn-1t; Wed, 24 May 2023 06:38:28 +0000 From: Christoph Hellwig To: Matthew Wilcox Cc: Jens Axboe , Xiubo Li , Ilya Dryomov , Alexander Viro , Christian Brauner , "Theodore Ts'o" , Jaegeuk Kim , Chao Yu , Miklos Szeredi , Andreas Gruenbacher , "Darrick J. Wong" , Trond Myklebust , Anna Schumaker , Damien Le Moal , Andrew Morton , linux-block@vger.kernel.org, ceph-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 05/11] filemap: add a kiocb_invalidate_pages helper Date: Wed, 24 May 2023 08:38:04 +0200 Message-Id: <20230524063810.1595778-6-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230524063810.1595778-1-hch@lst.de> References: <20230524063810.1595778-1-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 Factor out a helper that calls filemap_write_and_wait_range and invalidate_inode_pages2_range for the range covered by a write kiocb or returns -EAGAIN if the kiocb is marked as nowait and there would be pages to write or invalidate. Signed-off-by: Christoph Hellwig Reviewed-by: Damien Le Moal Acked-by: Darrick J. Wong Reviewed-by: Hannes Reinecke --- include/linux/pagemap.h | 1 + mm/filemap.c | 48 ++++++++++++++++++++++++----------------- 2 files changed, 29 insertions(+), 20 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 36fc2cea13ce20..6e4c9ee40baa99 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -30,6 +30,7 @@ static inline void invalidate_remote_inode(struct inode *inode) int invalidate_inode_pages2(struct address_space *mapping); int invalidate_inode_pages2_range(struct address_space *mapping, pgoff_t start, pgoff_t end); +int kiocb_invalidate_pages(struct kiocb *iocb, size_t count); int write_inode_now(struct inode *, int sync); int filemap_fdatawrite(struct address_space *); diff --git a/mm/filemap.c b/mm/filemap.c index 5fcd5227f9cae2..a1cb01a4b8046a 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2777,6 +2777,33 @@ int kiocb_write_and_wait(struct kiocb *iocb, size_t count) return filemap_write_and_wait_range(mapping, pos, end); } +int kiocb_invalidate_pages(struct kiocb *iocb, size_t count) +{ + struct address_space *mapping = iocb->ki_filp->f_mapping; + loff_t pos = iocb->ki_pos; + loff_t end = pos + count - 1; + int ret; + + if (iocb->ki_flags & IOCB_NOWAIT) { + /* we could block if there are any pages in the range */ + if (filemap_range_has_page(mapping, pos, end)) + return -EAGAIN; + } else { + ret = filemap_write_and_wait_range(mapping, pos, end); + if (ret) + return ret; + } + + /* + * After a write we want buffered reads to be sure to go to disk to get + * the new data. We invalidate clean cached page from the region we're + * about to write. We do this *before* the write so that we can return + * without clobbering -EIOCBQUEUED from ->direct_IO(). + */ + return invalidate_inode_pages2_range(mapping, pos >> PAGE_SHIFT, + end >> PAGE_SHIFT); +} + /** * generic_file_read_iter - generic filesystem read routine * @iocb: kernel I/O control block @@ -3820,30 +3847,11 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from) write_len = iov_iter_count(from); end = (pos + write_len - 1) >> PAGE_SHIFT; - if (iocb->ki_flags & IOCB_NOWAIT) { - /* If there are pages to writeback, return */ - if (filemap_range_has_page(file->f_mapping, pos, - pos + write_len - 1)) - return -EAGAIN; - } else { - written = filemap_write_and_wait_range(mapping, pos, - pos + write_len - 1); - if (written) - goto out; - } - - /* - * After a write we want buffered reads to be sure to go to disk to get - * the new data. We invalidate clean cached page from the region we're - * about to write. We do this *before* the write so that we can return - * without clobbering -EIOCBQUEUED from ->direct_IO(). - */ - written = invalidate_inode_pages2_range(mapping, - pos >> PAGE_SHIFT, end); /* * If a page can not be invalidated, return 0 to fall back * to buffered write. */ + written = kiocb_invalidate_pages(iocb, write_len); if (written) { if (written == -EBUSY) return 0;