From patchwork Sun Nov 12 23:33:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 13453419 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 CBE321BDC4; Sun, 12 Nov 2023 23:33:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="OLEHzdl7" Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E93F81BF7; Sun, 12 Nov 2023 15:33:45 -0800 (PST) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 909C61F45B; Sun, 12 Nov 2023 23:33:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1699832024; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=2ICh6pwnGbyOeDtbMijzBbhE79LgWANYXpveNTIE9xU=; b=OLEHzdl7V+xuiIU4reczBrpKCJSdMZV5NbKkfELGXdK/8JRkdWMZw8ayWk+3fnPwIuPPwQ FGZKIK+rIqcbVkD5tZwGFbib6rfiuReUL2awxDXpQufVYWqYBgU2Asl7oK1RGdMP/yLmvc w5WL+xDBtwG7VBjjdcYvD5R6Qdk46xA= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 82A371391A; Sun, 12 Nov 2023 23:33:43 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id pO9qENdgUWUZJwAAMHmgww (envelope-from ); Sun, 12 Nov 2023 23:33:43 +0000 From: Qu Wenruo To: linux-btrfs@vger.kernel.org, fstests@vger.kernel.org Subject: [PATCH] fstests: btrfs: test snapshot creation with existing qgroup Date: Mon, 13 Nov 2023 10:03:25 +1030 Message-ID: <20231112233325.103250-1-wqu@suse.com> X-Mailer: git-send-email 2.42.1 Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 [BUG] There is a sysbot regression report about transaction abort during snapshot creation, which is caused by the new timing of qgroup creation and too strict error check. [FIX] The proper fix is already submitted, with the title "btrfs: do not abort transaction if there is already an existing qgroup". [TEST] The new test case would reproduce the regression by: - Create a subvolume and a snapshot of it - Record the subvolumeid of the snapshot - Re-create the fs Since btrfs won't reuse the subvolume id, we have to re-create the fs. - Enable quota and create a qgroup with the same subvolumeid - Create a subvolume and a snapshot of it For unpatched and affected kernel (thankfully no release is affected), the snapshot creation would fail due to aborted transaction. - Make sure the subvolume id doesn't change for the snapshot There is one very hacky attempt to fix it by avoiding using the subvolume id, which is completely wrong and would be caught by this extra check. Signed-off-by: Qu Wenruo --- tests/btrfs/303 | 80 +++++++++++++++++++++++++++++++++++++++++++++ tests/btrfs/303.out | 2 ++ 2 files changed, 82 insertions(+) create mode 100755 tests/btrfs/303 create mode 100644 tests/btrfs/303.out diff --git a/tests/btrfs/303 b/tests/btrfs/303 new file mode 100755 index 00000000..fe924496 --- /dev/null +++ b/tests/btrfs/303 @@ -0,0 +1,80 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2023 SUSE Linux Products GmbH. All Rights Reserved. +# +# FS QA Test 303 +# +# A regression test to make sure snapshot creation won't cause transaction +# abort if there is already an existing qgroup. +# +. ./common/preamble +_begin_fstest auto quick qgroup + +. ./common/filter + +_supported_fs btrfs +_require_scratch + +_fixed_by_kernel_commit xxxxxxxxxxxx \ + "btrfs: do not abort transaction if there is already an existing qgroup" + +_scratch_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed" +_scratch_mount + +# Create the first subvolume and get its id. +# This subvolume id should not change no matter if there is an existing +# qgroup for it. +$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/subvol" >> $seqres.full +$BTRFS_UTIL_PROG subvolume snapshot "$SCRATCH_MNT/subvol" \ + "$SCRATCH_MNT/snapshot">> $seqres.full + +init_subvolid=$(_btrfs_get_subvolid "$SCRATCH_MNT" "snapshot") + +if [ -z "$init_subvolid" ]; then + _fail "Unable to get the subvolid of the first snapshot" +fi + +echo "Subvolumeid: ${init_subvolid}" >> $seqres.full + +_scratch_unmount + +# Re-create the fs, as btrfs won't reuse the subvolume id. +_scratch_mkfs >> $seqres.full 2>&1 || _fail "2nd mkfs failed" +_scratch_mount + +$BTRFS_UTIL_PROG quota enable "$SCRATCH_MNT" >> $seqres.full +$BTRFS_UTIL_PROG quota rescan -w "$SCRATCH_MNT" >> $seqres.full + +# Create a qgroup for the first subvolume, this would make the later +# subvolume creation to find an existing qgroup, and abort transaction. +$BTRFS_UTIL_PROG qgroup create 0/"$init_subvolid" "$SCRATCH_MNT" >> $seqres.full +sync + +# Now create the first snapshot, which should have the same subvolid no matter +# if the quota is enabled. +$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/subvol" >> $seqres.full +$BTRFS_UTIL_PROG subvolume snapshot "$SCRATCH_MNT/subvol" \ + "$SCRATCH_MNT/snapshot">> $seqres.full + +# Either the snapshot create failed and transaction is aborted thus no +# snapshot here, or we should be able to create the snapshot. +new_subvolid=$(_btrfs_get_subvolid "$SCRATCH_MNT" "snapshot") + +echo "Subvolumeid: ${new_subvolid}" >> $seqres.full + +if [ -z "$new_subvolid" ]; then + _fail "Unable to get the subvolid of the first snapshot" +fi + +# Make sure the subvolumeid for the first snapshot didn't change. +if [ "$new_subvolid" -ne "$init_subvolid" ]; then + _fail "Subvolumeid for the first snapshot changed, has ${new_subvolid} expect ${init_subvolid}" +fi + +_scratch_unmount + +echo "Silence is golden" + +# success, all done +status=0 +exit diff --git a/tests/btrfs/303.out b/tests/btrfs/303.out new file mode 100644 index 00000000..d48808e6 --- /dev/null +++ b/tests/btrfs/303.out @@ -0,0 +1,2 @@ +QA output created by 303 +Silence is golden