From patchwork Thu Sep 3 20:33:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris Burkov X-Patchwork-Id: 11754791 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8145C746 for ; Thu, 3 Sep 2020 20:34:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5B35B20678 for ; Thu, 3 Sep 2020 20:34:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bur.io header.i=@bur.io header.b="tJd9EOnc"; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="Eq8JZrnC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729654AbgICUeN (ORCPT ); Thu, 3 Sep 2020 16:34:13 -0400 Received: from wout4-smtp.messagingengine.com ([64.147.123.20]:41951 "EHLO wout4-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728397AbgICUdm (ORCPT ); Thu, 3 Sep 2020 16:33:42 -0400 Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailout.west.internal (Postfix) with ESMTP id 941A5B7D; Thu, 3 Sep 2020 16:33:41 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute4.internal (MEProxy); Thu, 03 Sep 2020 16:33:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bur.io; h=from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=fm1; bh=HagPjOACRN0ZR AjXKjqa97WiriWA6vKYdQzDQ3X7Xwo=; b=tJd9EOncj2NkZDUJAaT7/GbwHeuYm 4g3sJgvU0isQ2PI54lbxyjRe/nCcW2cdYTuID5cY9kInSqoD/xdZB+zlZKNrzHqf WoGBfLImm1HZQUgE04jpWBCmta1LQA/iLKzJPLMf3J+Y96BMOcQYZTmggjn+Cjc6 IMs4SNDCu2HBhAoEmA4S+ceGhaU/80tHoA6ho6bw5nUNPiPuMMGugNKSwiGkUubt HqMf8sb1LrMQg91kYdcdaZwCyAYwojMvy6AgXuJmnvaE2Pzr8AesM7jK2RBV9N66 xZDXCgZKWZ4aHQtdWtb9yiFY06QUL8wTufsLwHZ/gCyul863evkyzOL7w== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:date:from :in-reply-to:message-id:mime-version:references:subject:to :x-me-proxy:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm3; bh=HagPjOACRN0ZRAjXKjqa97WiriWA6vKYdQzDQ3X7Xwo=; b=Eq8JZrnC ExuYj0dQzaVUIo5sTL4tcUK9s+RmtmV2kTLwn8x9uu47gB69kjyPyrFWMdUpUa7m IlRTYrOsH6rbHs58iMr9WjN2HqnU7zQMGWXK9wWX695s/BXV5qqKcP9ldPJaDF+z KTuqCv9+C6GVrS9F3ZlxP966AUgfRnSq0Yj2qwyruFvMT9RvlEeCXf2yVFoUovPn 7sECGix1D4n84dz7UJN+TPZeBOtq+HYIaOimnVXxIRiJrvs+xPQsFWyTLfmGej2u qaVGvVkXFS2Zwb/8U2khkPZZFRBSjdqbsYvGNNbwh4UUwryBNW+8rx78b+p6C24o tfhMdwSiGKE1ww== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduiedrudeguddgudehvdcutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfgh necuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd enucfjughrpefhvffufffkofgjfhgggfestdekredtredttdenucfhrhhomhepuehorhhi shcuuehurhhkohhvuceosghorhhishessghurhdrihhoqeenucggtffrrghtthgvrhhnpe etheehudfgleelhfehffettedtfeelvdfghfelkeefgefgvdevgefffedvtdefgeenucff ohhmrghinhepghhithhhuhgsrdgtohhmnecukfhppeduieefrdduudegrddufedvrdefne cuvehluhhsthgvrhfuihiivgepudenucfrrghrrghmpehmrghilhhfrhhomhepsghorhhi shessghurhdrihho X-ME-Proxy: Received: from localhost (unknown [163.114.132.3]) by mail.messagingengine.com (Postfix) with ESMTPA id 8DBA5328005E; Thu, 3 Sep 2020 16:33:40 -0400 (EDT) From: Boris Burkov To: Dave Sterba , Josef Bacik , Chris Mason Cc: Boris Burkov , linux-btrfs@vger.kernel.org, kernel-team@fb.com Subject: [PATCH 2/2] btrfs: remove free space items when creating free space tree Date: Thu, 3 Sep 2020 13:33:09 -0700 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org When the file system transitions from space cache v1 to v2 it removes the old cached data, but does not remove the FREE_SPACE items nor the free space inodes they point to. This doesn't cause any issues besides being a bit inefficient, since these items no longer do anything useful. To fix it, as part of populating the free space tree, destroy each block group's free space item and free space inode. This code is lifted from the existing code for removing them when removing the block group. Furthermore, cache_save_setup is called unconditionally from transaction commit on dirty block groups, so we must also stop creating these items when we are not using SPACE_CACHE. References: https://github.com/btrfs/btrfs-todo/issues/5 Signed-off-by: Boris Burkov --- fs/btrfs/block-group.c | 42 ++++--------------------------- fs/btrfs/free-space-cache.c | 49 ++++++++++++++++++++++++++++++++++++- fs/btrfs/free-space-cache.h | 2 ++ fs/btrfs/free-space-tree.c | 3 +++ 4 files changed, 58 insertions(+), 38 deletions(-) diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c index 01e8ba1da1d3..d9cda5696649 100644 --- a/fs/btrfs/block-group.c +++ b/fs/btrfs/block-group.c @@ -892,8 +892,6 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, struct btrfs_path *path; struct btrfs_block_group *block_group; struct btrfs_free_cluster *cluster; - struct btrfs_root *tree_root = fs_info->tree_root; - struct btrfs_key key; struct inode *inode; struct kobject *kobj = NULL; int ret; @@ -971,42 +969,9 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, spin_unlock(&trans->transaction->dirty_bgs_lock); mutex_unlock(&trans->transaction->cache_write_mutex); - if (!IS_ERR(inode)) { - ret = btrfs_orphan_add(trans, BTRFS_I(inode)); - if (ret) { - btrfs_add_delayed_iput(inode); - goto out; - } - clear_nlink(inode); - /* One for the block groups ref */ - spin_lock(&block_group->lock); - if (block_group->iref) { - block_group->iref = 0; - block_group->inode = NULL; - spin_unlock(&block_group->lock); - iput(inode); - } else { - spin_unlock(&block_group->lock); - } - /* One for our lookup ref */ - btrfs_add_delayed_iput(inode); - } - - key.objectid = BTRFS_FREE_SPACE_OBJECTID; - key.type = 0; - key.offset = block_group->start; - - ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); - if (ret < 0) + ret = remove_free_space_inode(trans, block_group); + if (ret) goto out; - if (ret > 0) - btrfs_release_path(path); - if (ret == 0) { - ret = btrfs_del_item(trans, tree_root, path); - if (ret) - goto out; - btrfs_release_path(path); - } spin_lock(&fs_info->block_group_cache_lock); rb_erase(&block_group->cache_node, @@ -2343,6 +2308,9 @@ static int cache_save_setup(struct btrfs_block_group *block_group, int retries = 0; int ret = 0; + if (!btrfs_test_opt(fs_info, SPACE_CACHE)) + return 0; + /* * If this block group is smaller than 100 megs don't bother caching the * block group. diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 8759f5a1d6a0..52612d99a842 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -207,6 +207,54 @@ int create_free_space_inode(struct btrfs_trans_handle *trans, ino, block_group->start); } +int remove_free_space_inode(struct btrfs_trans_handle *trans, + struct btrfs_block_group *block_group) +{ + struct btrfs_path *path; + struct inode *inode; + struct btrfs_key key; + int ret = 0; + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + inode = lookup_free_space_inode(block_group, path); + if (IS_ERR(inode)) { + if (PTR_ERR(inode) != -ENOENT) + ret = PTR_ERR(inode); + goto out; + } + ret = btrfs_orphan_add(trans, BTRFS_I(inode)); + if (ret) { + btrfs_add_delayed_iput(inode); + goto out; + } + clear_nlink(inode); + /* One for the block groups ref */ + spin_lock(&block_group->lock); + if (block_group->iref) { + block_group->iref = 0; + block_group->inode = NULL; + spin_unlock(&block_group->lock); + iput(inode); + } else { + spin_unlock(&block_group->lock); + } + /* One for our lookup ref */ + btrfs_add_delayed_iput(inode); + + key.objectid = BTRFS_FREE_SPACE_OBJECTID; + key.type = 0; + key.offset = block_group->start; + ret = btrfs_search_slot(trans, trans->fs_info->tree_root, &key, path, -1, 1); + if (ret != 0) + goto out; + ret = btrfs_del_item(trans, trans->fs_info->tree_root, path); +out: + btrfs_free_path(path); + return ret; +} + int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info, struct btrfs_block_rsv *rsv) { @@ -2806,7 +2854,6 @@ void btrfs_remove_free_space_cache(struct btrfs_block_group *block_group) __btrfs_remove_free_space_cache_locked(ctl); btrfs_discard_update_discardable(block_group, ctl); spin_unlock(&ctl->tree_lock); - } /** diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h index e3d5e0ad8f8e..f75302efc025 100644 --- a/fs/btrfs/free-space-cache.h +++ b/fs/btrfs/free-space-cache.h @@ -84,6 +84,8 @@ struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group, int create_free_space_inode(struct btrfs_trans_handle *trans, struct btrfs_block_group *block_group, struct btrfs_path *path); +int remove_free_space_inode(struct btrfs_trans_handle *trans, + struct btrfs_block_group *block_group); int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info, struct btrfs_block_rsv *rsv); diff --git a/fs/btrfs/free-space-tree.c b/fs/btrfs/free-space-tree.c index 6b9faf3b0e96..30943d585854 100644 --- a/fs/btrfs/free-space-tree.c +++ b/fs/btrfs/free-space-tree.c @@ -1165,6 +1165,9 @@ int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info) block_group = rb_entry(node, struct btrfs_block_group, cache_node); ret = populate_free_space_tree(trans, block_group); + if (ret) + goto abort; + ret = remove_free_space_inode(trans, block_group); if (ret) goto abort; node = rb_next(node);