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From:   "Matthew Wilcox (Oracle)" <willy@infradead.org>
To:     linux-fsdevel@vger.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@infradead.org>,
        linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
        linux-aio@kvack.org, linux-btrfs@vger.kernel.org,
        linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net,
        cluster-devel@redhat.com, linux-mm@kvack.org,
        linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org,
        linux-ntfs-dev@lists.sourceforge.net, ocfs2-devel@oss.oracle.com,
        linux-mtd@lists.infradead.org,
        virtualization@lists.linux-foundation.org
Subject: [PATCH 19/20] fs: Remove aops->migratepage()
Date:   Mon,  6 Jun 2022 21:40:49 +0100
Message-Id: <20220606204050.2625949-20-willy@infradead.org>
In-Reply-To: <20220606204050.2625949-1-willy@infradead.org>
References: <20220606204050.2625949-1-willy@infradead.org>
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With all users converted to migrate_folio(), remove this operation.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/fs.h |  2 --
 mm/compaction.c    |  5 ++---
 mm/migrate.c       | 10 +---------
 3 files changed, 3 insertions(+), 14 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 5737c92ed286..95347cc035ae 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -367,8 +367,6 @@ struct address_space_operations {
 	 */
 	int (*migrate_folio)(struct address_space *, struct folio *dst,
 			struct folio *src, enum migrate_mode);
-	int (*migratepage) (struct address_space *,
-			struct page *, struct page *, enum migrate_mode);
 	bool (*isolate_page)(struct page *, isolate_mode_t);
 	void (*putback_page)(struct page *);
 	int (*launder_folio)(struct folio *);
diff --git a/mm/compaction.c b/mm/compaction.c
index db34b459e5d9..f0dc62159c0e 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1034,7 +1034,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 
 			/*
 			 * Only pages without mappings or that have a
-			 * ->migratepage callback are possible to migrate
+			 * ->migrate_folio callback are possible to migrate
 			 * without blocking. However, we can be racing with
 			 * truncation so it's necessary to lock the page
 			 * to stabilise the mapping as truncation holds
@@ -1046,8 +1046,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 
 			mapping = page_mapping(page);
 			migrate_dirty = !mapping ||
-					mapping->a_ops->migrate_folio ||
-					mapping->a_ops->migratepage;
+					mapping->a_ops->migrate_folio;
 			unlock_page(page);
 			if (!migrate_dirty)
 				goto isolate_fail_put;
diff --git a/mm/migrate.c b/mm/migrate.c
index a8edd226c72d..c5560430dce4 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -911,9 +911,6 @@ static int move_to_new_folio(struct folio *dst, struct folio *src,
 			 */
 			rc = mapping->a_ops->migrate_folio(mapping, dst, src,
 								mode);
-		else if (mapping->a_ops->migratepage)
-			rc = mapping->a_ops->migratepage(mapping, &dst->page,
-							&src->page, mode);
 		else
 			rc = fallback_migrate_folio(mapping, dst, src, mode);
 	} else {
@@ -928,12 +925,7 @@ static int move_to_new_folio(struct folio *dst, struct folio *src,
 			goto out;
 		}
 
-		if (mapping->a_ops->migrate_folio)
-			rc = mapping->a_ops->migrate_folio(mapping, dst, src,
-								mode);
-		else
-			rc = mapping->a_ops->migratepage(mapping, &dst->page,
-							&src->page, mode);
+		rc = mapping->a_ops->migrate_folio(mapping, dst, src, mode);
 		WARN_ON_ONCE(rc == MIGRATEPAGE_SUCCESS &&
 				!folio_test_isolated(src));
 	}
-- 
2.35.1