linux-kernel - Re: [PATCH v2 2/4] mm: Add file_operations.get_mapping

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Message-ID: <aTaYtlTdhxKx2R24@casper.infradead.org>
Date: Mon, 8 Dec 2025 09:21:58 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Peter Xu <peterx@...hat.com>
Cc: kvm@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Jason Gunthorpe <jgg@...dia.com>, Nico Pache <npache@...hat.com>,
	Zi Yan <ziy@...dia.com>, Alex Mastro <amastro@...com>,
	David Hildenbrand <david@...hat.com>,
	Alex Williamson <alex@...zbot.org>, Zhi Wang <zhiw@...dia.com>,
	David Laight <david.laight.linux@...il.com>,
	Yi Liu <yi.l.liu@...el.com>, Ankit Agrawal <ankita@...dia.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>,
	Jonathan Corbet <corbet@....net>, linux-fsdevel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
	Pedro Falcato <pfalcato@...e.de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...nel.org>
Subject: Re: [PATCH v2 2/4] mm: Add file_operations.get_mapping_order()

On Thu, Dec 04, 2025 at 10:19:44AM -0500, Peter Xu wrote:
> > Add one new file operation, get_mapping_order().  It can be used by file
> > backends to report mapping order hints.

This seems like a terrible idea.  I'll look at it after Plumbers.