From mboxrd@z Thu Jan 1 00:00:00 1970 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 C717DC43217 for ; Thu, 16 Dec 2021 21:07:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241772AbhLPVHt (ORCPT ); Thu, 16 Dec 2021 16:07:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241568AbhLPVHW (ORCPT ); Thu, 16 Dec 2021 16:07:22 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5E82AC06173E; Thu, 16 Dec 2021 13:07:22 -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=ojl5PaoTezGTatzmMRn19yoajNZ3Q7oGrHkVaeCU+1s=; b=KrDp8ssOxyFOEkwsHG1jbhpE+m f3ox4dRdgAMy1a/FKw/GLEyZ5kCeNcyd2YGIqI4Hd8Gdi+R6X6Ly4fkFbl1iz1FTXzKilqyf7at8l o8Da2diwp4PDcOXMCYhXtAT2SgzjKFrjJWo606LDpG1eul3/EyDj4gaT5lAbeG7jQi5F2B97UBv1W qJncU7hUTseU3KMKxRklCknrcBcMYlWSL05EOh9kmd8Hs5nhFOE6gdwequd74YvQPEVUo7WZOg8Nm +SPjIeue68Exu9t68fgYWQhIllPPk8hNHCZJWwBAF6FCFRD4e1TWbmLQtHKsYaf55jdV60/cUmSkM +i6JJ4YQ==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mxxyC-00Fx4M-Lz; Thu, 16 Dec 2021 21:07:20 +0000 From: "Matthew Wilcox (Oracle)" To: "Darrick J. Wong" Cc: "Matthew Wilcox (Oracle)" , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 15/25] iomap: Allow iomap_write_begin() to be called with the full length Date: Thu, 16 Dec 2021 21:07:05 +0000 Message-Id: <20211216210715.3801857-16-willy@infradead.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211216210715.3801857-1-willy@infradead.org> References: <20211216210715.3801857-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In the future, we want write_begin to know the entire length of the write so that it can choose to allocate large folios. Pass the full length in from __iomap_zero_iter() and limit it where necessary. Signed-off-by: Matthew Wilcox (Oracle) --- fs/iomap/buffered-io.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 8d7a67655b60..b1ded5204d1c 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -619,6 +619,9 @@ static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos, if (fatal_signal_pending(current)) return -EINTR; + if (!mapping_large_folio_support(iter->inode->i_mapping)) + len = min_t(size_t, len, PAGE_SIZE - offset_in_page(pos)); + if (page_ops && page_ops->page_prepare) { status = page_ops->page_prepare(iter->inode, pos, len); if (status) @@ -632,6 +635,8 @@ static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos, goto out_no_page; } folio = page_folio(page); + if (pos + len > folio_pos(folio) + folio_size(folio)) + len = folio_pos(folio) + folio_size(folio) - pos; if (srcmap->type == IOMAP_INLINE) status = iomap_write_begin_inline(iter, page); @@ -891,11 +896,13 @@ static s64 __iomap_zero_iter(struct iomap_iter *iter, loff_t pos, u64 length) struct page *page; int status; unsigned offset = offset_in_page(pos); - unsigned bytes = min_t(u64, PAGE_SIZE - offset, length); + unsigned bytes = min_t(u64, UINT_MAX, length); status = iomap_write_begin(iter, pos, bytes, &page); if (status) return status; + if (bytes > PAGE_SIZE - offset) + bytes = PAGE_SIZE - offset; zero_user(page, offset, bytes); mark_page_accessed(page); -- 2.33.0