From patchwork Tue Jun 8 18:27:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 456742 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=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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 9806AC4743E for ; Tue, 8 Jun 2021 18:33:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 77FE6613C1 for ; Tue, 8 Jun 2021 18:33:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234647AbhFHSey (ORCPT ); Tue, 8 Jun 2021 14:34:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:57970 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234434AbhFHSd2 (ORCPT ); Tue, 8 Jun 2021 14:33:28 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E2663613E3; Tue, 8 Jun 2021 18:31:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1623177078; bh=FhuMOzjwoHRjltgVuDX12qfBEpLyI8/y3rqoGjJGeFo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q93t8HQslD4sxs5zob4q35G6ntufUZzvXbbhSAIZ2fzIPSx1Zr9D6hmqwvzoKzfMQ DA5hBZBbsyJZtJgxSFasZjv/4OUf0GBbVQ+BebyRbVX0nFdcMP9iRP0vnhGsiJqtLo Dq9ILgnhYAgTlClk7w/LTU+YcDjhcnGF46g1NGIw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Qu Wenruo , Josef Bacik , David Sterba Subject: [PATCH 4.14 24/47] btrfs: fix error handling in btrfs_del_csums Date: Tue, 8 Jun 2021 20:27:07 +0200 Message-Id: <20210608175931.272544367@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210608175930.477274100@linuxfoundation.org> References: <20210608175930.477274100@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Josef Bacik commit b86652be7c83f70bf406bed18ecf55adb9bfb91b upstream. Error injection stress would sometimes fail with checksums on disk that did not have a corresponding extent. This occurred because the pattern in btrfs_del_csums was while (1) { ret = btrfs_search_slot(); if (ret < 0) break; } ret = 0; out: btrfs_free_path(path); return ret; If we got an error from btrfs_search_slot we'd clear the error because we were breaking instead of goto out. Instead of using goto out, simply handle the cases where we may leave a random value in ret, and get rid of the ret = 0; out: pattern and simply allow break to have the proper error reporting. With this fix we properly abort the transaction and do not commit thinking we successfully deleted the csum. Reviewed-by: Qu Wenruo CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/file-item.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -599,7 +599,7 @@ int btrfs_del_csums(struct btrfs_trans_h u64 end_byte = bytenr + len; u64 csum_end; struct extent_buffer *leaf; - int ret; + int ret = 0; u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); int blocksize_bits = fs_info->sb->s_blocksize_bits; @@ -615,6 +615,7 @@ int btrfs_del_csums(struct btrfs_trans_h path->leave_spinning = 1; ret = btrfs_search_slot(trans, root, &key, path, -1, 1); if (ret > 0) { + ret = 0; if (path->slots[0] == 0) break; path->slots[0]--; @@ -671,7 +672,7 @@ int btrfs_del_csums(struct btrfs_trans_h ret = btrfs_del_items(trans, root, path, path->slots[0], del_nr); if (ret) - goto out; + break; if (key.offset == bytenr) break; } else if (key.offset < bytenr && csum_end > end_byte) { @@ -715,8 +716,9 @@ int btrfs_del_csums(struct btrfs_trans_h ret = btrfs_split_item(trans, root, path, &key, offset); if (ret && ret != -EAGAIN) { btrfs_abort_transaction(trans, ret); - goto out; + break; } + ret = 0; key.offset = end_byte - 1; } else { @@ -726,8 +728,6 @@ int btrfs_del_csums(struct btrfs_trans_h } btrfs_release_path(path); } - ret = 0; -out: btrfs_free_path(path); return ret; }