[Ocfs2-devel] + mmjfs-move-write_one_page-folio_write_one-to-jfs.patch added to mm-unstable branch

[Ocfs2-devel] + mmjfs-move-write_one_page-folio_write_one-to-jfs.patch added to mm-unstable branch

[Andrew Morton via Ocfs2-devel]

The patch titled
     Subject: mm,jfs: move write_one_page/folio_write_one to jfs
has been added to the -mm mm-unstable branch.  Its filename is
     mmjfs-move-write_one_page-folio_write_one-to-jfs.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mmjfs-move-write_one_page-folio_write_one-to-jfs.patch

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

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------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: mm,jfs: move write_one_page/folio_write_one to jfs
Date: Tue, 7 Mar 2023 15:31:25 +0100

The last remaining user of folio_write_one through the write_one_page
wrapper is jfs, so move the functionality there and hard code the call to
metapage_writepage.

Note that the use of the pagecache by the JFS 'metapage' buffer cache is a
bit odd, and we could probably do without VM-level dirty tracking at all,
but that's a change for another time.

Link: https://lkml.kernel.org/r/20230307143125.27778-4-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Evgeniy Dushistov <dushistov@mail.ru>
Cc: Gang He <ghe@suse.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jan Kara via Ocfs2-devel <ocfs2-devel@oss.oracle.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/jfs/jfs_metapage.c   |   39 ++++++++++++++++++++++++++++++++-----
 include/linux/pagemap.h |    6 -----
 mm/page-writeback.c     |   40 --------------------------------------
 3 files changed, 34 insertions(+), 51 deletions(-)

--- a/fs/jfs/jfs_metapage.c~mmjfs-move-write_one_page-folio_write_one-to-jfs
+++ a/fs/jfs/jfs_metapage.c
@@ -691,6 +691,35 @@ void grab_metapage(struct metapage * mp)
 	unlock_page(mp->page);
 }
 
+static int metapage_write_one(struct page *page)
+{
+	struct folio *folio = page_folio(page);
+	struct address_space *mapping = folio->mapping;
+	struct writeback_control wbc = {
+		.sync_mode = WB_SYNC_ALL,
+		.nr_to_write = folio_nr_pages(folio),
+	};
+	int ret = 0;
+
+	BUG_ON(!folio_test_locked(folio));
+
+	folio_wait_writeback(folio);
+
+	if (folio_clear_dirty_for_io(folio)) {
+		folio_get(folio);
+		ret = metapage_writepage(page, &wbc);
+		if (ret == 0)
+			folio_wait_writeback(folio);
+		folio_put(folio);
+	} else {
+		folio_unlock(folio);
+	}
+
+	if (!ret)
+		ret = filemap_check_errors(mapping);
+	return ret;
+}
+
 void force_metapage(struct metapage *mp)
 {
 	struct page *page = mp->page;
@@ -700,8 +729,8 @@ void force_metapage(struct metapage *mp)
 	get_page(page);
 	lock_page(page);
 	set_page_dirty(page);
-	if (write_one_page(page))
-		jfs_error(mp->sb, "write_one_page() failed\n");
+	if (metapage_write_one(page))
+		jfs_error(mp->sb, "metapage_write_one() failed\n");
 	clear_bit(META_forcewrite, &mp->flag);
 	put_page(page);
 }
@@ -746,9 +775,9 @@ void release_metapage(struct metapage *
 		set_page_dirty(page);
 		if (test_bit(META_sync, &mp->flag)) {
 			clear_bit(META_sync, &mp->flag);
-			if (write_one_page(page))
-				jfs_error(mp->sb, "write_one_page() failed\n");
-			lock_page(page); /* write_one_page unlocks the page */
+			if (metapage_write_one(page))
+				jfs_error(mp->sb, "metapage_write_one() failed\n");
+			lock_page(page);
 		}
 	} else if (mp->lsn)	/* discard_metapage doesn't remove it */
 		remove_from_logsync(mp);
--- a/include/linux/pagemap.h~mmjfs-move-write_one_page-folio_write_one-to-jfs
+++ a/include/linux/pagemap.h
@@ -1066,12 +1066,6 @@ static inline void folio_cancel_dirty(st
 bool folio_clear_dirty_for_io(struct folio *folio);
 bool clear_page_dirty_for_io(struct page *page);
 void folio_invalidate(struct folio *folio, size_t offset, size_t length);
-int __must_check folio_write_one(struct folio *folio);
-static inline int __must_check write_one_page(struct page *page)
-{
-	return folio_write_one(page_folio(page));
-}
-
 int __set_page_dirty_nobuffers(struct page *page);
 bool noop_dirty_folio(struct address_space *mapping, struct folio *folio);
 
--- a/mm/page-writeback.c~mmjfs-move-write_one_page-folio_write_one-to-jfs
+++ a/mm/page-writeback.c
@@ -2583,46 +2583,6 @@ int do_writepages(struct address_space *
 	return ret;
 }
 
-/**
- * folio_write_one - write out a single folio and wait on I/O.
- * @folio: The folio to write.
- *
- * The folio must be locked by the caller and will be unlocked upon return.
- *
- * Note that the mapping's AS_EIO/AS_ENOSPC flags will be cleared when this
- * function returns.
- *
- * Return: %0 on success, negative error code otherwise
- */
-int folio_write_one(struct folio *folio)
-{
-	struct address_space *mapping = folio->mapping;
-	int ret = 0;
-	struct writeback_control wbc = {
-		.sync_mode = WB_SYNC_ALL,
-		.nr_to_write = folio_nr_pages(folio),
-	};
-
-	BUG_ON(!folio_test_locked(folio));
-
-	folio_wait_writeback(folio);
-
-	if (folio_clear_dirty_for_io(folio)) {
-		folio_get(folio);
-		ret = mapping->a_ops->writepage(&folio->page, &wbc);
-		if (ret == 0)
-			folio_wait_writeback(folio);
-		folio_put(folio);
-	} else {
-		folio_unlock(folio);
-	}
-
-	if (!ret)
-		ret = filemap_check_errors(mapping);
-	return ret;
-}
-EXPORT_SYMBOL(folio_write_one);
-
 /*
  * For address_spaces which do not use buffers nor write back.
  */
_

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

ufs-dont-flush-page-immediately-for-dirsync-directories.patch
ocfs2-dont-use-write_one_page-in-ocfs2_duplicate_clusters_by_page.patch
mmjfs-move-write_one_page-folio_write_one-to-jfs.patch


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