From patchwork Tue Nov 26 20:27:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Darrick J. Wong" X-Patchwork-Id: 13886343 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 B0689193419; Tue, 26 Nov 2024 20:27:30 +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=1732652850; cv=none; b=XSVuJZEq9X6PWBrjrOE+mxRE8UQ6YGtLBC1X5Po+hJV8kHRB+LWY+bHP+ClEPsXBaUEw2CXsMnhvsDm6/9HAvWRqFq/sHoRDQbQuLO5W/NI2+o+U35WcP1yQblWexkT4WKAHFD/y4Tf4KT1Hjj8SnZ91t2aE2Mk9PZ8d6ClgDqM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732652850; c=relaxed/simple; bh=TYTTEcADoj0P4RwbnNGjWDRcHXFtfoVsq0hH5omAcuw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Doijpd0HW0b3xcGLhNJhDaxKkeh4WPe/hEHeZCvgsdQRfM4rzEQR80DBvH1XK5xDqcvBRWGcLwkUSeoNGiddGbHth3/xDY59IFwQnLMGM8cVjpUzAUkDXhOtUHFrJ4u/bd5b17Za5dwenbgQ65ild91EJKBwS4ZlFeY0gfFflMY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=k9ursXUR; 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="k9ursXUR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 446DFC4CECF; Tue, 26 Nov 2024 20:27:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732652850; bh=TYTTEcADoj0P4RwbnNGjWDRcHXFtfoVsq0hH5omAcuw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=k9ursXURTUEReE0n5dqp+zjj2+4ENLdNB9yv2RC4OrNDHQkiDYjAc4tR17qb+oTQk pdfwKjZPJiCLlBoOaExaJPBSb4y08VRFbrkPVtK/xiUdge/5ZkUKQeP6Rc4xSPBVV+ 2sczYkKnqTcFsxZRPhBCs61OW5W/ww5yVF/mg2MqkYZpD10RPOBWBw0fK2LkvD84+r sAkkbYuoCHQ/A7wL2xgaVC8XwptlpY9lFucA3fwZm/jCWb3SOIVoJOrvQl53xif2B/ stzS4mUktk6FqklbX+M38JekD6c94dAVL7qqnvrx0AnpM/KTtAzDfufQrEywPe76CA OxXlXv74wlRug== Date: Tue, 26 Nov 2024 12:27:29 -0800 From: "Darrick J. Wong" To: zlang@redhat.com Cc: zlang@kernel.org, fstests@vger.kernel.org, linux-xfs@vger.kernel.org Subject: [PATCH 17/16] generic/459: prevent collisions between test VMs backed by a shared disk pool Message-ID: <20241126202729.GP9438@frogsfrogsfrogs> References: <20241126011838.GI9438@frogsfrogsfrogs> <173258395050.4031902.8257740212723106524.stgit@frogsfrogsfrogs> Precedence: bulk X-Mailing-List: fstests@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <173258395050.4031902.8257740212723106524.stgit@frogsfrogsfrogs> From: Darrick J. Wong If you happen to be running fstests on a bunch of VMs and the VMs all have access to a shared disk pool, then it's possible that two VMs could be running generic/459 at exactly the same time. In that case, it's a VERY bad thing to have two nodes trying to create an LVM volume group named "vg_459" because one node will succeed, after which the other node will see the vg_459 volume group that it didn't create: A volume group called vg_459 already exists. Logical volume pool_459 already exists in Volume group vg_459. Logical Volume "lv_459" already exists in volume group "vg_459" But then, because this is bash, we don't abort the test script and continue executing. If we're lucky this fails when /dev/vg_459/lv_459 disappears before mkfs can run: Error accessing specified device /dev/mapper/vg_459-lv_459: No such file or directory Usage: mkfs.xfs But in the bad case both nodes write filesystems to the same device and then they trample all over each other. Fix this by adding the hostname and pid to all the LVM names so that they won't collide. Fixes: 461dad511f6b91 ("generic: Test filesystem lockup on full overprovisioned dm-thin") Signed-off-by: "Darrick J. Wong" Reviewed-by: Christoph Hellwig --- tests/generic/459 | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/tests/generic/459 b/tests/generic/459 index 98177f6b5ef8fb..32ee899f929819 100755 --- a/tests/generic/459 +++ b/tests/generic/459 @@ -47,10 +47,17 @@ _require_command "$THIN_CHECK_PROG" thin_check _require_freeze _require_odirect -vgname=vg_$seq -lvname=lv_$seq -poolname=pool_$seq -snapname=snap_$seq +# Create all the LVM names with the hostname and pid so that we don't have any +# collisions between VMs running from a shared pool of disks. Hyphens become +# underscores because LVM turns those into double hyphens, which messes with +# accessing /dev/mapper/$vg-$lv (which you're not supposed to do but this test +# does anyway). +lvmsuffix="${seq}_$(hostname -s | tr '-' '_')_$$" + +vgname=vg_$lvmsuffix +lvname=lv_$lvmsuffix +poolname=pool_$lvmsuffix +snapname=snap_$lvmsuffix origpsize=200 virtsize=300 newpsize=300