From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EFB438F74 for ; Sun, 16 Jul 2023 20:18:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 72FC8C433C7; Sun, 16 Jul 2023 20:18:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1689538707; bh=Ivuf+0SuMYrUq0yJBznwxLtuVdQP/7bUl4P8Ejn9llE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HV7dbWbIseLHCTPDe63VU1Za/BhBR+7EYWD1bHX1l7OV1sQz3+f2U/V2Ax2AUwJHa bpGBC++9R6bYj4tn+A//HUJXwEbUY1wj8jqfWDoPWFkSgMe8msZnOrGGaJgoeZM0G9 KTUxfDuQfMzYeZ4RkkTNZZyjgDDULPgz2H3DxgeY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Qu Wenruo , Filipe Manana , David Sterba Subject: [PATCH 6.4 530/800] btrfs: do not BUG_ON() on tree mod log failure at balance_level() Date: Sun, 16 Jul 2023 21:46:23 +0200 Message-ID: <20230716195001.404517473@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230716194949.099592437@linuxfoundation.org> References: <20230716194949.099592437@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Filipe Manana commit 39020d8abc7ec62c4de9b260e3d10d4a1c2478ce upstream. At balance_level(), instead of doing a BUG_ON() in case we fail to record tree mod log operations, do a transaction abort and return the error to the callers. There's really no need for the BUG_ON() as we can release all resources in this context, and we have to abort because other future tree searches that use the tree mod log (btrfs_search_old_slot()) may get inconsistent results if other operations modify the tree after that failure and before the tree mod log based search. CC: stable@vger.kernel.org # 5.4+ Reviewed-by: Qu Wenruo Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/ctree.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1042,7 +1042,12 @@ static noinline int balance_level(struct } ret = btrfs_tree_mod_log_insert_root(root->node, child, true); - BUG_ON(ret < 0); + if (ret < 0) { + btrfs_tree_unlock(child); + free_extent_buffer(child); + btrfs_abort_transaction(trans, ret); + goto enospc; + } rcu_assign_pointer(root->node, child); add_root_to_dirty_list(root); @@ -1130,7 +1135,10 @@ static noinline int balance_level(struct btrfs_node_key(right, &right_key, 0); ret = btrfs_tree_mod_log_insert_key(parent, pslot + 1, BTRFS_MOD_LOG_KEY_REPLACE); - BUG_ON(ret < 0); + if (ret < 0) { + btrfs_abort_transaction(trans, ret); + goto enospc; + } btrfs_set_node_key(parent, &right_key, pslot + 1); btrfs_mark_buffer_dirty(parent); } @@ -1176,7 +1184,10 @@ static noinline int balance_level(struct btrfs_node_key(mid, &mid_key, 0); ret = btrfs_tree_mod_log_insert_key(parent, pslot, BTRFS_MOD_LOG_KEY_REPLACE); - BUG_ON(ret < 0); + if (ret < 0) { + btrfs_abort_transaction(trans, ret); + goto enospc; + } btrfs_set_node_key(parent, &mid_key, pslot); btrfs_mark_buffer_dirty(parent); }