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Date:   Mon,  5 Dec 2022 13:29:25 +0100
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        "Ritesh Harjani (IBM)" <ritesh.list@...il.com>,
        Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>
Subject: [PATCH v3 11/12] ext4: Stop providing .writepage hook

Now we don't need .writepage hook for anything anymore. Reclaim is fine
with relying on .writepages to clean pages and we often couldn't do much
from the .writepage callback anyway. We only need to provide
.migrate_folio callback for the ext4_journalled_aops - let's use
buffer_migrate_page_norefs() there so that buffers cannot be modified
under jdb2's hands.

Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/inode.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f3b3792c1c96..acf9d23c1cfb 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3718,7 +3718,6 @@ static int ext4_iomap_swap_activate(struct swap_info_struct *sis,
 static const struct address_space_operations ext4_aops = {
 	.read_folio		= ext4_read_folio,
 	.readahead		= ext4_readahead,
-	.writepage		= ext4_writepage,
 	.writepages		= ext4_writepages,
 	.write_begin		= ext4_write_begin,
 	.write_end		= ext4_write_end,
@@ -3736,7 +3735,6 @@ static const struct address_space_operations ext4_aops = {
 static const struct address_space_operations ext4_journalled_aops = {
 	.read_folio		= ext4_read_folio,
 	.readahead		= ext4_readahead,
-	.writepage		= ext4_writepage,
 	.writepages		= ext4_writepages,
 	.write_begin		= ext4_write_begin,
 	.write_end		= ext4_journalled_write_end,
@@ -3745,6 +3743,7 @@ static const struct address_space_operations ext4_journalled_aops = {
 	.invalidate_folio	= ext4_journalled_invalidate_folio,
 	.release_folio		= ext4_release_folio,
 	.direct_IO		= noop_direct_IO,
+	.migrate_folio		= buffer_migrate_folio_norefs,
 	.is_partially_uptodate  = block_is_partially_uptodate,
 	.error_remove_page	= generic_error_remove_page,
 	.swap_activate		= ext4_iomap_swap_activate,
@@ -3753,7 +3752,6 @@ static const struct address_space_operations ext4_journalled_aops = {
 static const struct address_space_operations ext4_da_aops = {
 	.read_folio		= ext4_read_folio,
 	.readahead		= ext4_readahead,
-	.writepage		= ext4_writepage,
 	.writepages		= ext4_writepages,
 	.write_begin		= ext4_da_write_begin,
 	.write_end		= ext4_da_write_end,
-- 
2.35.3

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