From patchwork Wed May 31 06:05:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13261507 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 24037C77B7A for ; Wed, 31 May 2023 06:05:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234340AbjEaGFz (ORCPT ); Wed, 31 May 2023 02:05:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231922AbjEaGFy (ORCPT ); Wed, 31 May 2023 02:05:54 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C6001122 for ; Tue, 30 May 2023 23:05:52 -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=BF0s7T9jjp5y++9jrDQKmApJ8ELIrnZZ+2OaNRXxmH4=; b=HH5lwMvMesx/f7mVQn2QEkdq27 DHfEEIQUKMZm/JfyW2/closnwN+USJKuQZRhH0fm+ebY0fEZfzLTmSlxOqv0U5WDIrujg4giIrRPc UCI/9i11u5fI8KCzH73wBdtdXejQ6c4wwJfC6lkr92KC3I2KWnb6TNdXj/cwCODCLYPSf/vTVG/RY N87BBw9i3cV7uIr8iq6u0oTdry/8HI6fM+0kHDj67V8o5k4QrAYnigLXnzL+pjZOFOArdvBQEJdoY yhBwbBXQviLWTgpwY1yXEWTFemaUP5L67Kqa+J8G/GmvSV1MbPQ98r9tsZB36f5z2jW26/CB84hhg Q2lL/kOA==; Received: from [2001:4bb8:182:6d06:f5c3:53d7:b5aa:b6a7] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1q4Exz-00GF9M-0U; Wed, 31 May 2023 06:05:51 +0000 From: Christoph Hellwig To: Chris Mason , Josef Bacik , David Sterba Cc: linux-btrfs@vger.kernel.org Subject: [PATCH 14/16] btrfs: don't redirty the locked page for extent_write_locked_range Date: Wed, 31 May 2023 08:05:03 +0200 Message-Id: <20230531060505.468704-15-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230531060505.468704-1-hch@lst.de> References: <20230531060505.468704-1-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-btrfs@vger.kernel.org Instead of redirtying the locked page before calling extent_write_locked_range, just pass a locked_page argument similar to many other functions in the btrfs writeback code, and then exclude the locked page from clearing the dirty bit in extent_write_locked_range. Signed-off-by: Christoph Hellwig --- fs/btrfs/extent_io.c | 17 ++++++++++------- fs/btrfs/extent_io.h | 3 ++- fs/btrfs/inode.c | 25 ++++++------------------- 3 files changed, 18 insertions(+), 27 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index f4d3c56b29009b..bc061b2ac55a12 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2210,8 +2210,8 @@ static int extent_write_cache_pages(struct address_space *mapping, * already been ran (aka, ordered extent inserted) and all pages are still * locked. */ -int extent_write_locked_range(struct inode *inode, u64 start, u64 end, - struct writeback_control *wbc) +int extent_write_locked_range(struct inode *inode, struct page *locked_page, + u64 start, u64 end, struct writeback_control *wbc) { bool found_error = false; int first_error = 0; @@ -2237,14 +2237,17 @@ int extent_write_locked_range(struct inode *inode, u64 start, u64 end, int nr = 0; page = find_get_page(mapping, cur >> PAGE_SHIFT); + /* - * All pages in the range are locked since - * btrfs_run_delalloc_range(), thus there is no way to clear - * the page dirty flag. + * All pages have been locked by btrfs_run_delalloc_range(), + * thus the dirty bit can't have been cleared. */ ASSERT(PageLocked(page)); - ASSERT(PageDirty(page)); - clear_page_dirty_for_io(page); + if (page != locked_page) { + /* already cleared by extent_write_cache_pages */ + ASSERT(PageDirty(page)); + clear_page_dirty_for_io(page); + } ret = __extent_writepage_io(BTRFS_I(inode), page, &bio_ctrl, i_size, &nr); diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index c5fae3a7d911bf..00c468aea010a1 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -178,7 +178,8 @@ int try_release_extent_mapping(struct page *page, gfp_t mask); int try_release_extent_buffer(struct page *page); int btrfs_read_folio(struct file *file, struct folio *folio); -int extent_write_locked_range(struct inode *inode, u64 start, u64 end, +int extent_write_locked_range(struct inode *inode, struct page *locked_page, + u64 start, u64 end, struct writeback_control *wbc); int extent_writepages(struct address_space *mapping, struct writeback_control *wbc); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 54b4b241b354fc..68ae20a3f785e3 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1088,17 +1088,9 @@ static noinline int compress_file_range(struct async_chunk *async_chunk) cleanup_and_bail_uncompressed: /* * No compression, but we still need to write the pages in the file - * we've been given so far. redirty the locked page if it corresponds - * to our extent and set things up for the async work queue to run - * cow_file_range to do the normal delalloc dance. + * we've been given so far. Set things up for the async work queue to + * run cow_file_range to do the normal delalloc dance. */ - if (async_chunk->locked_page && - (page_offset(async_chunk->locked_page) >= start && - page_offset(async_chunk->locked_page)) <= end) { - __set_page_dirty_nobuffers(async_chunk->locked_page); - /* unlocked later on in the async handlers */ - } - if (redirty) extent_range_redirty_for_io(&inode->vfs_inode, start, end); add_async_extent(async_chunk, start, end - start + 1, 0, NULL, 0, @@ -1169,7 +1161,8 @@ static int submit_uncompressed_range(struct btrfs_inode *inode, /* All pages will be unlocked, including @locked_page */ wbc_attach_fdatawrite_inode(&wbc, &inode->vfs_inode); - ret = extent_write_locked_range(&inode->vfs_inode, start, end, &wbc); + ret = extent_write_locked_range(&inode->vfs_inode, locked_page, start, + end, &wbc); wbc_detach_inode(&wbc); return ret; } @@ -1829,7 +1822,6 @@ static noinline int run_delalloc_zoned(struct btrfs_inode *inode, { u64 done_offset = end; int ret; - bool locked_page_done = false; while (start <= end) { ret = cow_file_range(inode, locked_page, start, end, page_started, @@ -1852,13 +1844,8 @@ static noinline int run_delalloc_zoned(struct btrfs_inode *inode, continue; } - if (!locked_page_done) { - __set_page_dirty_nobuffers(locked_page); - account_page_redirty(locked_page); - } - locked_page_done = true; - extent_write_locked_range(&inode->vfs_inode, start, done_offset, - wbc); + extent_write_locked_range(&inode->vfs_inode, locked_page, start, + done_offset, wbc); start = done_offset + 1; }