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 X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 A3DC1C4743F for ; Tue, 8 Jun 2021 02:59:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85A8A60D07 for ; Tue, 8 Jun 2021 02:59:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230517AbhFHDBd (ORCPT ); Mon, 7 Jun 2021 23:01:33 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:59458 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230500AbhFHDBd (ORCPT ); Mon, 7 Jun 2021 23:01:33 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 436D01FD50 for ; Tue, 8 Jun 2021 02:59:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1623121180; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bnn572NeYmcucOpzPr9HMbtx9YeO4YUB1SRIjQ1Mihk=; b=QCKz4QtsTBOWjMDT9ulsSvzsrZnNGIFuuAtjWDa6q6mCbHfywHzwiUZSUNurEFdoJzGiE4 7EkVpp3pd6sDCv1Jrt+zHqmX+I35vx2Ka1UzIFECA9tb75GLQw8UrHbYeF8ImIiXiTmma6 MF4x30yUZSOKZ/bmrNxCwA9tlENK2D4= Received: from adam-pc.lan (unknown [10.163.16.38]) by relay2.suse.de (Postfix) with ESMTP id 366F1A3B81 for ; Tue, 8 Jun 2021 02:59:38 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH v3 05/10] btrfs: defrag: introduce a helper to defrag a continuous prepared range Date: Tue, 8 Jun 2021 10:59:22 +0800 Message-Id: <20210608025927.119169-6-wqu@suse.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210608025927.119169-1-wqu@suse.com> References: <20210608025927.119169-1-wqu@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org A new helper, defrag_one_locked_target(), introduced to do the real part of defrag. The caller needs to ensure both page and extents bits are locked, and no ordered extent for the range, and all writeback is finished. The core defrag part is pretty straight-forward: - Reserve space - Set extent bits to defrag - Update involved pages to be dirty Signed-off-by: Qu Wenruo --- fs/btrfs/ioctl.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 6af37a9e0738..42e757dfdd7b 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -47,6 +47,7 @@ #include "space-info.h" #include "delalloc-space.h" #include "block-group.h" +#include "subpage.h" #ifdef CONFIG_64BIT /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI @@ -1492,6 +1493,61 @@ static int defrag_collect_targets(struct btrfs_inode *inode, return ret; } +#define CLUSTER_SIZE (SZ_256K) + +/* + * Defrag one continuous target range. + * + * @inode: Target inode + * @target: Target range to defrag + * @pages: Locked pages covering the defrag range + * @nr_pages: Number of locked pages + * + * Caller should ensure: + * + * - Pages are prepared + * Pages should be locked, no ordered extent in the pages range, + * no writeback. + * + * - Extent bits are locked + */ +static int defrag_one_locked_target(struct btrfs_inode *inode, + struct defrag_target_range *target, + struct page **pages, int nr_pages, + struct extent_state **cached_state) +{ + struct btrfs_fs_info *fs_info = inode->root->fs_info; + struct extent_changeset *data_reserved = NULL; + const u64 start = target->start; + const u64 len = target->len; + unsigned long last_index = (start + len - 1) >> PAGE_SHIFT; + unsigned long start_index = start >> PAGE_SHIFT; + unsigned long first_index = page_index(pages[0]); + int ret = 0; + int i; + + ASSERT(last_index - first_index + 1 <= nr_pages); + + ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len); + if (ret < 0) + return ret; + clear_extent_bit(&inode->io_tree, start, start + len - 1, + EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | + EXTENT_DEFRAG, 0, 0, cached_state); + set_extent_defrag(&inode->io_tree, start, start + len - 1, + cached_state); + + /* Update the page status */ + for (i = start_index - first_index; i <= last_index - first_index; + i++) { + ClearPageChecked(pages[i]); + btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len); + } + btrfs_delalloc_release_extents(inode, len); + extent_changeset_free(data_reserved); + return ret; +} + /* * Btrfs entrace for defrag. * -- 2.31.1