linux-ext4 - [PATCH v2 0/11] ext4: Stop providing .writepage hook

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Message-Id: <20221202183943.22640-10-jack@suse.cz>
Date:   Fri,  2 Dec 2022 19:39:35 +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 <ritesh.list@...il.com>, Jan Kara <jack@...e.cz>
Subject: [PATCH v2 0/11] 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.

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 d14c6d44bdf1..1c9dec0d5109 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3717,7 +3717,6 @@ 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,
@@ -3735,7 +3734,6 @@ 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,
@@ -3744,6 +3742,7 @@ 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,
@@ -3752,7 +3751,6 @@ 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