linux-ext4 - Re: [PATCH v3 17/25] gup: Don't allow FOLL

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Message-ID: <fa5e1bb4-33a3-49eb-9b57-038cac3c0e15@nvidia.com>
Date: Thu, 21 Nov 2024 19:23:30 -0800
From: John Hubbard <jhubbard@...dia.com>
To: Alistair Popple <apopple@...dia.com>, <dan.j.williams@...el.com>,
	<linux-mm@...ck.org>
CC: <lina@...hilina.net>, <zhang.lyra@...il.com>,
	<gerald.schaefer@...ux.ibm.com>, <vishal.l.verma@...el.com>,
	<dave.jiang@...el.com>, <logang@...tatee.com>, <bhelgaas@...gle.com>,
	<jack@...e.cz>, <jgg@...pe.ca>, <catalin.marinas@....com>, <will@...nel.org>,
	<mpe@...erman.id.au>, <npiggin@...il.com>, <dave.hansen@...ux.intel.com>,
	<ira.weiny@...el.com>, <willy@...radead.org>, <djwong@...nel.org>,
	<tytso@....edu>, <linmiaohe@...wei.com>, <david@...hat.com>,
	<peterx@...hat.com>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <nvdimm@...ts.linux.dev>,
	<linux-cxl@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-ext4@...r.kernel.org>, <linux-xfs@...r.kernel.org>, <hch@....de>,
	<david@...morbit.com>
Subject: Re: [PATCH v3 17/25] gup: Don't allow FOLL_LONGTERM pinning of FS DAX
 pages

On 11/21/24 5:40 PM, Alistair Popple wrote:
> Longterm pinning of FS DAX pages should already be disallowed by
> various pXX_devmap checks. However a future change will cause these
> checks to be invalid for FS DAX pages so make
> folio_is_longterm_pinnable() return false for FS DAX pages.
> 
> Signed-off-by: Alistair Popple <apopple@...dia.com>
> ---
>   include/linux/mm.h | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 22c651b..4f9ae37 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2004,6 +2004,10 @@ static inline bool folio_is_longterm_pinnable(struct folio *folio)
>   	if (folio_is_device_coherent(folio))
>   		return false;
>   
> +	/* DAX must also always allow eviction. */
> +	if (folio_is_fsdax(folio))
> +		return false;
> +
>   	/* Otherwise, non-movable zone folios can be pinned. */
>   	return !folio_is_zone_movable(folio);
>   

Reviewed-by: John Hubbard <jhubbard@...dia.com>


thanks,
-- 
John Hubbard