linux-kernel - [PATCH v4 3/7] fs/dax: Use free_zone_device_folio

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Message-ID: <20260111205820.830410-4-francois.dugast@intel.com>
Date: Sun, 11 Jan 2026 21:55:42 +0100
From: Francois Dugast <francois.dugast@...el.com>
To: intel-xe@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org,
	Matthew Brost <matthew.brost@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Matthew Wilcox <willy@...radead.org>,
	Jan Kara <jack@...e.cz>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Zi Yan <ziy@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	Balbir Singh <balbirs@...dia.com>,
	linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	nvdimm@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Francois Dugast <francois.dugast@...el.com>
Subject: [PATCH v4 3/7] fs/dax: Use free_zone_device_folio_prepare() helper

From: Matthew Brost <matthew.brost@...el.com>

Use free_zone_device_folio_prepare() to restore fsdax ZONE_DEVICE folios
to a sane initial state upon the final put.

Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Jan Kara <jack@...e.cz>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...nel.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Liam R. Howlett <Liam.Howlett@...cle.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Mike Rapoport <rppt@...nel.org>
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Zi Yan <ziy@...dia.com>
Cc: Alistair Popple <apopple@...dia.com>
Cc: Balbir Singh <balbirs@...dia.com>
Cc: linux-mm@...ck.org
Cc: linux-fsdevel@...r.kernel.org
Cc: nvdimm@...ts.linux.dev
Cc: linux-kernel@...r.kernel.org
Suggested-by: Alistair Popple <apopple@...dia.com>
Signed-off-by: Matthew Brost <matthew.brost@...el.com>
Signed-off-by: Francois Dugast <francois.dugast@...el.com>
---
 fs/dax.c | 24 +-----------------------
 1 file changed, 1 insertion(+), 23 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 289e6254aa30..d998f7615abb 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -391,29 +391,7 @@ static inline unsigned long dax_folio_put(struct folio *folio)
 	if (ref)
 		return ref;
 
-	folio->mapping = NULL;
-	order = folio_order(folio);
-	if (!order)
-		return 0;
-	folio_reset_order(folio);
-
-	for (i = 0; i < (1UL << order); i++) {
-		struct dev_pagemap *pgmap = page_pgmap(&folio->page);
-		struct page *page = folio_page(folio, i);
-		struct folio *new_folio = (struct folio *)page;
-
-		ClearPageHead(page);
-		clear_compound_head(page);
-
-		new_folio->mapping = NULL;
-		/*
-		 * Reset pgmap which was over-written by
-		 * prep_compound_page().
-		 */
-		new_folio->pgmap = pgmap;
-		new_folio->share = 0;
-		WARN_ON_ONCE(folio_ref_count(new_folio));
-	}
+	free_zone_device_folio_prepare(folio);
 
 	return ref;
 }
-- 
2.43.0