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 6F52614648A; Wed, 7 Feb 2024 21:27:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707341270; cv=none; b=hG7O9TPx629bGK1pykkEu3ybPVVSpIWuh6FW0Xcfu86OqFRaYu3IWOYBRG87RZ9i6SO0l6S7YCG0MG+0lN/AEsUTh9RXunEcbVjIoDJgrk5ifaqjDxX4QUVldq5CcRkaoLZ/W6StfvfGwljR1I+HIWp7Ue8ss1yTNiWqYgG+nMs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707341270; c=relaxed/simple; bh=5un39WipYhd5C/IiDz/ejM1fr4dDqQJ/rd8BJ5YIENw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=B88PNERFLbSSfAt6O1DnoeKOmgu9l6B/eLlUS1rZiW9dz2so09XKtDk/LFPwg2uOHYVrPFNIzE7+1dVYetkukZ4Z3SJuOXBnV6ZOtCPASQXQPoz7TzlRNItFqZpRreJYcrnNbBXXAyYzshqfg+BZLKzYMpJvTFioe6Uuj9ES6J0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=sS1Gh+tY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="sS1Gh+tY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3F99DC433C7; Wed, 7 Feb 2024 21:27:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1707341270; bh=5un39WipYhd5C/IiDz/ejM1fr4dDqQJ/rd8BJ5YIENw=; h=From:To:Cc:Subject:Date:From; b=sS1Gh+tY1Q9Wk7V8YWOxTaCRoZGgrOwF5YzL2gnjvtc+BL2E5b+jjf68LIqRgj0o7 dGwv1iLotVUVUODUJFhjkDvSiShf4tiS6mCsyZrJ5lyOEqOl36QStEVGXwh1zeO1rn Ncf/kOT1/Nm1zwPTh/6bqYmYPlAY/nD+h1TKmnaQ5/nu+KeGV7yiH5YgE3jfWgbX7L oOaQ1BTR/ZWDu03Wgtf71yUOrzGQ3mioAHjRLWxLWUTV7FBD51Z4ebGQBLsFr+FlO/ OKhcXq2BkWEvTEb4WWZknT9zJNGtLVvzsuRqrk3BhV2XYmOXbPKTMcT+Idr5IHgZ1E FtPQi5r296itw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Baokun Li , Jan Kara , Theodore Ts'o , Sasha Levin , adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 1/3] ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found() Date: Wed, 7 Feb 2024 16:27:45 -0500 Message-ID: <20240207212747.4783-1-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 4.19.306 Content-Transfer-Encoding: 8bit From: Baokun Li [ Upstream commit 4530b3660d396a646aad91a787b6ab37cf604b53 ] Determine if the group block bitmap is corrupted before using ac_b_ex in ext4_mb_try_best_found() to avoid allocating blocks from a group with a corrupted block bitmap in the following concurrency and making the situation worse. ext4_mb_regular_allocator ext4_lock_group(sb, group) ext4_mb_good_group // check if the group bbitmap is corrupted ext4_mb_complex_scan_group // Scan group gets ac_b_ex but doesn't use it ext4_unlock_group(sb, group) ext4_mark_group_bitmap_corrupted(group) // The block bitmap was corrupted during // the group unlock gap. ext4_mb_try_best_found ext4_lock_group(ac->ac_sb, group) ext4_mb_use_best_found mb_mark_used // Allocating blocks in block bitmap corrupted group Signed-off-by: Baokun Li Reviewed-by: Jan Kara Link: https://lore.kernel.org/r/20240104142040.2835097-7-libaokun1@huawei.com Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- fs/ext4/mballoc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 8875fac9f958..cf034a38e8ba 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -1802,6 +1802,9 @@ int ext4_mb_try_best_found(struct ext4_allocation_context *ac, return err; ext4_lock_group(ac->ac_sb, group); + if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) + goto out; + max = mb_find_extent(e4b, ex.fe_start, ex.fe_len, &ex); if (max > 0) { @@ -1809,6 +1812,7 @@ int ext4_mb_try_best_found(struct ext4_allocation_context *ac, ext4_mb_use_best_found(ac, e4b); } +out: ext4_unlock_group(ac->ac_sb, group); ext4_mb_unload_buddy(e4b); -- 2.43.0