linux-ext4 - [PATCH 6/7] jfs: remove ->writepage

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Date:   Fri,  2 Dec 2022 11:26:43 +0100
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Jan Kara <jack@...e.com>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
        Dave Kleikamp <shaggy@...nel.org>,
        Bob Copeland <me@...copeland.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        jfs-discussion@...ts.sourceforge.net,
        linux-karma-devel@...ts.sourceforge.net, linux-mm@...ck.org,
        Dave Kleikamp <dave.kleikamp@...cle.com>,
        Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH 6/7] jfs: remove ->writepage

->writepage is a very inefficient method to write back data, and only
used through write_cache_pages or a a fallback when no ->migrate_folio
method is present.

Set ->migrate_folio to the generic buffer_head based helper, and remove
the ->writepage implementation.

Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Acked-by: Johannes Weiner <hannes@...xchg.org>
---
 fs/jfs/inode.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index d1ec920aa030a8..8ac10e39605081 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -264,11 +264,6 @@ int jfs_get_block(struct inode *ip, sector_t lblock,
 	return rc;
 }
 
-static int jfs_writepage(struct page *page, struct writeback_control *wbc)
-{
-	return block_write_full_page(page, jfs_get_block, wbc);
-}
-
 static int jfs_writepages(struct address_space *mapping,
 			struct writeback_control *wbc)
 {
@@ -355,12 +350,12 @@ const struct address_space_operations jfs_aops = {
 	.invalidate_folio = block_invalidate_folio,
 	.read_folio	= jfs_read_folio,
 	.readahead	= jfs_readahead,
-	.writepage	= jfs_writepage,
 	.writepages	= jfs_writepages,
 	.write_begin	= jfs_write_begin,
 	.write_end	= jfs_write_end,
 	.bmap		= jfs_bmap,
 	.direct_IO	= jfs_direct_IO,
+	.migrate_folio	= buffer_migrate_folio,
 };
 
 /*
-- 
2.30.2