linux-kernel - Re: [PATCH v3 2/5] libnvdimm/pfn: Prevent raw mode fallback if pfn-infoblock valid

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Message-ID: <87imjnrml1.fsf@linux.ibm.com>
Date:   Mon, 02 Mar 2020 17:32:50 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>, linux-nvdimm@...ts.01.org
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 2/5] libnvdimm/pfn: Prevent raw mode fallback if
 pfn-infoblock valid

Dan Williams <dan.j.williams@...el.com> writes:

> The EOPNOTSUPP return code from the pmem driver indicates that the
> namespace has a configuration that may be valid, but the current kernel
> does not support it. Expand this to all of the nd_pfn_validate() error
> conditions after the infoblock has been verified as self consistent.
>
> This prevents exposing the namespace to I/O when the infoblock needs to
> be corrected, or the system needs to be put into a different
> configuration (like changing the page size on PowerPC).
>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>

> Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Cc: Jeff Moyer <jmoyer@...hat.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  drivers/nvdimm/pfn_devs.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
> index a5c25cb87116..79fe02d6f657 100644
> --- a/drivers/nvdimm/pfn_devs.c
> +++ b/drivers/nvdimm/pfn_devs.c
> @@ -561,14 +561,14 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
>  			dev_dbg(&nd_pfn->dev, "align: %lx:%lx mode: %d:%d\n",
>  					nd_pfn->align, align, nd_pfn->mode,
>  					mode);
> -			return -EINVAL;
> +			return -EOPNOTSUPP;
>  		}
>  	}
>  
>  	if (align > nvdimm_namespace_capacity(ndns)) {
>  		dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n",
>  				align, nvdimm_namespace_capacity(ndns));
> -		return -EINVAL;
> +		return -EOPNOTSUPP;
>  	}
>  
>  	/*
> @@ -581,7 +581,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
>  	if (offset >= resource_size(&nsio->res)) {
>  		dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n",
>  				dev_name(&ndns->dev));
> -		return -EBUSY;
> +		return -EOPNOTSUPP;
>  	}
>  
>  	if ((align && !IS_ALIGNED(nsio->res.start + offset + start_pad, align))
> @@ -589,7 +589,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
>  		dev_err(&nd_pfn->dev,
>  				"bad offset: %#llx dax disabled align: %#lx\n",
>  				offset, align);
> -		return -ENXIO;
> +		return -EOPNOTSUPP;
>  	}
>  
>  	return 0;
> _______________________________________________
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