From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lamorak.hansenpartnership.com (lamorak.hansenpartnership.com [198.37.111.173]) (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 18C40231A55; Tue, 3 Jun 2025 14:57:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.37.111.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748962643; cv=none; b=ai0N/YoIl3FoP1h5ZNFMsnAjoBCQKxkoGXgRocP4OrZIoALGA1GB9BFXrevrZnBPNlZm1yKRMOEgKUD6RhO+/8A2L1GYslmZ6j9aMD8bCN+f2bQj5txgBxRBwVd/EKaI+bpjiRl9MwLKaJIHjEJ4yAaBm063Vb6PhgnHr3cLlSk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748962643; c=relaxed/simple; bh=yhNKPc+4nAWEagNDi/x/10xSjseHIU5i0x8Ubt4/nqQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=aryz0jCeMqS5aFSLTSauYZKG0ScMeXUeqGOVDpw/kiIIoVpxA1ojI+ct3WvI9cv7uRTAkJ/gAr+4fYzBE0TjfKv2LtLtQHFX7oS8cOPD5ieE7SPpF6MbKtCZFC+D2QkTk/rFvd1Z3duxteVUDqGe1NIVAHXrXuYu0f33dnm6RGY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com; spf=pass smtp.mailfrom=HansenPartnership.com; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b=lqFlWBr7; arc=none smtp.client-ip=198.37.111.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="lqFlWBr7" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1748962639; bh=yhNKPc+4nAWEagNDi/x/10xSjseHIU5i0x8Ubt4/nqQ=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References:From; b=lqFlWBr7IJlhJ1Spf3Mj2WjUCxtPUnlNsFoBVKPzOBVpXLose6Wgtfwx5j/GpG+8Y uoJgNqBFGup+v+3gbKuwgsYtZBMLSv7+65TaA9FBiyGo1YU9rw/FHL/ju1RHVN19Bp f01J/h6LVQuZfki+1pVNe8C32VoGtjZ6xnvlvZNc= Received: from [IPv6:2601:5c4:4302:c21::a774] (unknown [IPv6:2601:5c4:4302:c21::a774]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lamorak.hansenpartnership.com (Postfix) with ESMTPSA id 3845F1C0096; Tue, 03 Jun 2025 10:57:19 -0400 (EDT) Message-ID: Subject: Re: [QUESTION] xfs, iomap: Handle writeback errors to prevent silent data corruption From: James Bottomley To: Christoph Hellwig , Damien Le Moal Cc: Yafang Shao , Matthew Wilcox , Christian Brauner , djwong@kernel.org, cem@kernel.org, linux-xfs@vger.kernel.org, Linux-Fsdevel , Damien Le Moal , Sathya Prakash , Sreekanth Reddy , Suganath Prabu Subramani , "Martin K. Petersen" , MPT-FusionLinux.pdl@broadcom.com, linux-scsi@vger.kernel.org Date: Tue, 03 Jun 2025 10:57:18 -0400 In-Reply-To: References: <26d6d164-5acd-4f85-a7ac-d01f44fb5a87@kernel.org> Autocrypt: addr=James.Bottomley@HansenPartnership.com; prefer-encrypt=mutual; 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 8mT2Eh9SkH+YVOmaKsajgZgrBxA7fWmGoxXswEVxJIFj3vW7yNc0C5HaUdYa5iGOMs4kg2ht4s7yy7NRQuh7BifWjo6BQ6k4S1H+6axZucxhSV1L6zN9d+lr3Xo/vy1unzA== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-06-03 at 07:41 -0700, Christoph Hellwig wrote: > [taking this private to discuss the mpt drivers] >=20 > > Hmmm... DID_SOFT_ERROR... Normally, this is an immediate retry as > > this normally is used to indicate that a command is a collateral > > abort due to an NCQ error, and per ATA spec, that command should be > > retried. However, the *BAD* thing about Broadcom HBAs using this is > > that it increments the command retry counter, so if a command ends > > up being retried more than 5 times due to other commands failing, > > the command runs out of retries and is failed like this. The > > command retry counter should *not* be incremented for NCQ > > collateral aborts. I tried to fix this, but it is impossible as we > > actually do not know if this is a collateral abort or something > > else. The HBA events used to handle completion do not allow > > differentiation. Waiting on Broadcom to do something about this > > (the mpi3mr HBA driver has the same nasty issue). >=20 > Maybe we should just change the mpt3 sas/mr drivers to use > DID_SOFT_ERROR less?=C2=A0 In fact there's not really a whole lot of > DID_SOFT_ERROR users otherwise, and there's probably better status > codes whatever they are doing can be translated to that do not > increment the retry counter. The status code that does that (retry without incrementing the counter) is DID_IMM_RETRY. The driver has to be a bit careful about using this because we can get into infinite retry loops. Regards, James