+ jfs-remove-writepage.patch added to mm-unstable branch

+ jfs-remove-writepage.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: jfs: remove ->writepage
has been added to the -mm mm-unstable branch.  Its filename is
     jfs-remove-writepage.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/jfs-remove-writepage.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: jfs: remove ->writepage
Date: Fri, 2 Dec 2022 11:26:43 +0100

->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.

Link: https://lkml.kernel.org/r/20221202102644.770505-7-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/jfs/inode.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- a/fs/jfs/inode.c~jfs-remove-writepage
+++ a/fs/jfs/inode.c
@@ -264,11 +264,6 @@ int jfs_get_block(struct inode *ip, sect
 	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 jf
 	.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,
 };
 
 /*
_

Patches currently in -mm which might be from hch@lst.de are

extfat-remove-writepage.patch
fat-remove-writepage.patch
hfs-remove-writepage.patch
hfsplus-remove-writepage.patch
hpfs-remove-writepage.patch
jfs-remove-writepage.patch
omfs-remove-writepage.patch