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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DB90EC43219 for ; Mon, 7 Feb 2022 11:44:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1384853AbiBGLaX (ORCPT ); Mon, 7 Feb 2022 06:30:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36038 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1383881AbiBGLXy (ORCPT ); Mon, 7 Feb 2022 06:23:54 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 147EEC0401C5; Mon, 7 Feb 2022 03:23:51 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C6311B8111C; Mon, 7 Feb 2022 11:23:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0D062C004E1; Mon, 7 Feb 2022 11:23:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1644233028; bh=/tGzveDzfTBR4qxgZ0fj0VvGpTMLFFUP9H5ABeVidT0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hzBb6oTzslXsmzBvC8y06E+A8SLrVur7SzMqx7Wee/KLHmX/iKXi0ghHy5Eo9KPgh +Aca4TwAqf/j8yHIPD3D+KPkX13SJYoXYv8YNHl5iADJMjL2wVGVX5Maf7DNrzf0Xm A44O1hgzZXfMYLBOfa0MqXZ7QD2njRDjNCP3RraU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xin Yin , Harshad Shirwadkar , Theodore Tso , stable@kernel.org Subject: [PATCH 5.10 68/74] ext4: modify the logic of ext4_mb_new_blocks_simple Date: Mon, 7 Feb 2022 12:07:06 +0100 Message-Id: <20220207103759.457691273@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220207103757.232676988@linuxfoundation.org> References: <20220207103757.232676988@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Xin Yin commit 31a074a0c62dc0d2bfb9b543142db4fe27f9e5eb upstream. For now in ext4_mb_new_blocks_simple, if we found a block which should be excluded then will switch to next group, this may probably cause 'group' run out of range. Change to check next block in the same group when get a block should be excluded. Also change the search range to EXT4_CLUSTERS_PER_GROUP and add error checking. Signed-off-by: Xin Yin Reviewed-by: Harshad Shirwadkar Link: https://lore.kernel.org/r/20220110035141.1980-3-yinxin.x@bytedance.com Signed-off-by: Theodore Ts'o Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman --- fs/ext4/mballoc.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-) --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -5173,7 +5173,8 @@ static ext4_fsblk_t ext4_mb_new_blocks_s struct super_block *sb = ar->inode->i_sb; ext4_group_t group; ext4_grpblk_t blkoff; - int i = sb->s_blocksize; + ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb); + ext4_grpblk_t i = 0; ext4_fsblk_t goal, block; struct ext4_super_block *es = EXT4_SB(sb)->s_es; @@ -5195,19 +5196,26 @@ static ext4_fsblk_t ext4_mb_new_blocks_s ext4_get_group_no_and_offset(sb, max(ext4_group_first_block_no(sb, group), goal), NULL, &blkoff); - i = mb_find_next_zero_bit(bitmap_bh->b_data, sb->s_blocksize, + while (1) { + i = mb_find_next_zero_bit(bitmap_bh->b_data, max, blkoff); + if (i >= max) + break; + if (ext4_fc_replay_check_excluded(sb, + ext4_group_first_block_no(sb, group) + i)) { + blkoff = i + 1; + } else + break; + } brelse(bitmap_bh); - if (i >= sb->s_blocksize) - continue; - if (ext4_fc_replay_check_excluded(sb, - ext4_group_first_block_no(sb, group) + i)) - continue; - break; + if (i < max) + break; } - if (group >= ext4_get_groups_count(sb) && i >= sb->s_blocksize) + if (group >= ext4_get_groups_count(sb) || i >= max) { + *errp = -ENOSPC; return 0; + } block = ext4_group_first_block_no(sb, group) + i; ext4_mb_mark_bb(sb, block, 1, 1);