From patchwork Tue Dec 17 15:36:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josef Bacik X-Patchwork-Id: 11298001 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 CD679138C for ; Tue, 17 Dec 2019 15:37:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ABA9D24655 for ; Tue, 17 Dec 2019 15:37:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=toxicpanda-com.20150623.gappssmtp.com header.i=@toxicpanda-com.20150623.gappssmtp.com header.b="N7sT5idB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728130AbfLQPhs (ORCPT ); Tue, 17 Dec 2019 10:37:48 -0500 Received: from mail-qk1-f194.google.com ([209.85.222.194]:45070 "EHLO mail-qk1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728642AbfLQPhs (ORCPT ); Tue, 17 Dec 2019 10:37:48 -0500 Received: by mail-qk1-f194.google.com with SMTP id x1so8563782qkl.12 for ; Tue, 17 Dec 2019 07:37:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=toxicpanda-com.20150623.gappssmtp.com; s=20150623; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=hVCdsgY0axs5iY5Kl0JKoFtdChssjram5zLjOOhpqoA=; b=N7sT5idBA6vBlRTbzGVk65eKWT4O+TcsUkjstVMc01vN5Yv77qk6C2wqIMnB3RBmNE Co1q5UIvs64he5SfBJOYshCzKyLwxiupuUmEWMvzVHpto7DY0iBA2FbSqYOSv5KsVRs7 YYJcz/VQ1uU9MgQpMQYujUJhJ5GvxuaSGdsPfjzizjoOeWBGfRnBm4X3ljyzIr1REhtP 6Z47TCfa018vJIh6vEndNwJptgX8X4byNM86zMJ5DLZ87KNkNAjB6WvCoJsZGzaImp/3 Expg+hgTD6FpC1Y8/oVSlo5re+4ZR9JkcQJGXmWoyC7uetd/+zTvvZ/tDCrWoDbvhyJM 6qvw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=hVCdsgY0axs5iY5Kl0JKoFtdChssjram5zLjOOhpqoA=; b=jk4RkzqYF/ba3ZKHDSCQ57ZHpCnzdLRTwNJDuBeGvmXXeJjTDFFijxHuvQtL8aZOBl wrKArnBukzawZvZK6DZX4fNt+M8N0sOeVKpT4MULa1dn6wi9eQSE7bhYgip973tv8gL3 zCAaiJWNnkVcSs01aFputmdd+eXWvDlzEtAsVMd8GLxfRikxmtA8aSUyfx3GjkLnf9LN pZheFCNBH4fORl1RFreTZBwz5+gRNEMOnS+NIRYzffekpFR9cZQBLTafaRUnfZNAX3lX MaLLiy3jluChal/2A8M27pDDl3xoT/QMifJ3j6/i3I3z/lJ6rPTnQFi023ztIRJpoqv4 F+Lw== X-Gm-Message-State: APjAAAXdqo0iyGsirrA3KAtxDtzf3/Ux6mYc5eTub8cBkt0hxJ18XSAS t5YJ8pjxKYP374rvAnmCXX2uwynTWIi0cw== X-Google-Smtp-Source: APXvYqwq6l3azX9R3InwaRtPFFZw9e3FC2KXbNmPNN4pJpwiEzptqvQCmgGB5WvQmhqIX8gezr4yWw== X-Received: by 2002:a37:b602:: with SMTP id g2mr5786026qkf.174.1576597066685; Tue, 17 Dec 2019 07:37:46 -0800 (PST) Received: from localhost ([107.15.81.208]) by smtp.gmail.com with ESMTPSA id n19sm7158341qkn.52.2019.12.17.07.37.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Dec 2019 07:37:45 -0800 (PST) From: Josef Bacik To: linux-btrfs@vger.kernel.org, kernel-team@fb.com Subject: [PATCH 38/45] btrfs: hold a ref on the root in open_ctree Date: Tue, 17 Dec 2019 10:36:28 -0500 Message-Id: <20191217153635.44733-39-josef@toxicpanda.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191217153635.44733-1-josef@toxicpanda.com> References: <20191217153635.44733-1-josef@toxicpanda.com> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org We lookup the fs_root and put it in our fs_info directly, we should hold a ref on this root for the lifetime of the fs_info. Rework the free'ing function so that it calls btrfs_put_fs_root() on the root at free time with all of the other global trees. Signed-off-by: Josef Bacik --- fs/btrfs/ctree.h | 17 ----------------- fs/btrfs/disk-io.c | 26 ++++++++++++++++++++++++++ fs/btrfs/disk-io.h | 1 + fs/btrfs/super.c | 6 +++--- 4 files changed, 30 insertions(+), 20 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index b2e8fd8a8e59..8578c65890b2 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2648,23 +2648,6 @@ static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info) return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info); } -static inline void free_fs_info(struct btrfs_fs_info *fs_info) -{ - kfree(fs_info->balance_ctl); - kfree(fs_info->delayed_root); - kfree(fs_info->extent_root); - kfree(fs_info->tree_root); - kfree(fs_info->chunk_root); - kfree(fs_info->dev_root); - kfree(fs_info->csum_root); - kfree(fs_info->quota_root); - kfree(fs_info->uuid_root); - kfree(fs_info->free_space_root); - kfree(fs_info->super_copy); - kfree(fs_info->super_for_commit); - kvfree(fs_info); -} - /* tree mod log functions from ctree.c */ u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info, struct seq_list *elem); diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index dfeeabfc341b..9435d4aa1668 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1525,6 +1525,25 @@ int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, return ret; } +void btrfs_free_fs_info(struct btrfs_fs_info *fs_info) +{ + kfree(fs_info->balance_ctl); + kfree(fs_info->delayed_root); + kfree(fs_info->extent_root); + kfree(fs_info->tree_root); + kfree(fs_info->chunk_root); + kfree(fs_info->dev_root); + kfree(fs_info->csum_root); + kfree(fs_info->quota_root); + kfree(fs_info->uuid_root); + kfree(fs_info->free_space_root); + kfree(fs_info->super_copy); + kfree(fs_info->super_for_commit); + btrfs_put_fs_root(fs_info->fs_root); + kvfree(fs_info); +} + + struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_key *location, bool check_ref) @@ -3188,6 +3207,13 @@ int __cold open_ctree(struct super_block *sb, goto fail_qgroup; } + if (!btrfs_grab_fs_root(fs_info->fs_root)) { + fs_info->fs_root = NULL; + err = -ENOENT; + btrfs_warn(fs_info, "failed to grab a ref on the fs tree"); + goto fail_qgroup; + } + if (sb_rdonly(sb)) return 0; diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h index 7e53da374715..80a65a0d9d33 100644 --- a/fs/btrfs/disk-io.h +++ b/fs/btrfs/disk-io.h @@ -68,6 +68,7 @@ struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_key *key, bool check_ref); +void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 9c50bee71de9..cc411304e2c9 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1559,7 +1559,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, if (s->s_root) { btrfs_close_devices(fs_devices); - free_fs_info(fs_info); + btrfs_free_fs_info(fs_info); if ((flags ^ s->s_flags) & SB_RDONLY) error = -EBUSY; } else { @@ -1582,7 +1582,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, error_close_devices: btrfs_close_devices(fs_devices); error_fs_info: - free_fs_info(fs_info); + btrfs_free_fs_info(fs_info); error_sec_opts: security_free_mnt_opts(&new_sec_opts); return ERR_PTR(error); @@ -2138,7 +2138,7 @@ static void btrfs_kill_super(struct super_block *sb) { struct btrfs_fs_info *fs_info = btrfs_sb(sb); kill_anon_super(sb); - free_fs_info(fs_info); + btrfs_free_fs_info(fs_info); } static struct file_system_type btrfs_fs_type = {