Merge tag 'pull-write-one-page' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs write_one_page removal from Al Viro:
 "write_one_page series"

* tag 'pull-write-one-page' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  mm,jfs: move write_one_page/folio_write_one to jfs
  ocfs2: don't use write_one_page in ocfs2_duplicate_clusters_by_page
  ufs: don't flush page immediately for DIRSYNC directories

Author: torvalds

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 * mp)
 		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);

fs/ocfs2/refcounttree.c

@@ -2952,10 +2952,11 @@ int ocfs2_duplicate_clusters_by_page(handle_t *handle,
 		 */
 		if (PAGE_SIZE <= OCFS2_SB(sb)->s_clustersize) {
 			if (PageDirty(page)) {
-				/*
-				 * write_on_page will unlock the page on return
-				 */
-				ret = write_one_page(page);
+				unlock_page(page);
+				put_page(page);
+
+				ret = filemap_write_and_wait_range(mapping,
+						offset, map_end - 1);
 				goto retry;
 			}
 		}

fs/ufs/dir.c

@@ -42,22 +42,27 @@ static inline int ufs_match(struct super_block *sb, int len,
 	return !memcmp(name, de->d_name, len);
 }
 
-static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
+static void ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
 {
 	struct address_space *mapping = page->mapping;
 	struct inode *dir = mapping->host;
-	int err = 0;
 
 	inode_inc_iversion(dir);
 	block_write_end(NULL, mapping, pos, len, len, page, NULL);
 	if (pos+len > dir->i_size) {
 		i_size_write(dir, pos+len);
 		mark_inode_dirty(dir);
 	}
-	if (IS_DIRSYNC(dir))
-		err = write_one_page(page);
-	else
-		unlock_page(page);
+	unlock_page(page);
+}
+
+static int ufs_handle_dirsync(struct inode *dir)
+{
+	int err;
+
+	err = filemap_write_and_wait(dir->i_mapping);
+	if (!err)
+		err = sync_inode_metadata(dir, 1);
 	return err;
 }
 
@@ -99,11 +104,12 @@ void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
 	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
 	ufs_set_de_type(dir->i_sb, de, inode->i_mode);
 
-	err = ufs_commit_chunk(page, pos, len);
+	ufs_commit_chunk(page, pos, len);
 	ufs_put_page(page);
 	if (update_times)
 		dir->i_mtime = dir->i_ctime = current_time(dir);
 	mark_inode_dirty(dir);
+	ufs_handle_dirsync(dir);
 }
 
 
@@ -390,10 +396,11 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
 	ufs_set_de_type(sb, de, inode->i_mode);
 
-	err = ufs_commit_chunk(page, pos, rec_len);
+	ufs_commit_chunk(page, pos, rec_len);
 	dir->i_mtime = dir->i_ctime = current_time(dir);
 
 	mark_inode_dirty(dir);
+	err = ufs_handle_dirsync(dir);
 	/* OFFSET_CACHE */
 out_put:
 	ufs_put_page(page);
@@ -531,9 +538,10 @@ int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
 	if (pde)
 		pde->d_reclen = cpu_to_fs16(sb, to - from);
 	dir->d_ino = 0;
-	err = ufs_commit_chunk(page, pos, to - from);
+	ufs_commit_chunk(page, pos, to - from);
 	inode->i_ctime = inode->i_mtime = current_time(inode);
 	mark_inode_dirty(inode);
+	err = ufs_handle_dirsync(inode);
 out:
 	ufs_put_page(page);
 	UFSD("EXIT\n");
@@ -579,7 +587,8 @@ int ufs_make_empty(struct inode * inode, struct inode *dir)
 	strcpy (de->d_name, "..");
 	kunmap(page);
 
-	err = ufs_commit_chunk(page, 0, chunk_size);
+	ufs_commit_chunk(page, 0, chunk_size);
+	err = ufs_handle_dirsync(inode);
 fail:
 	put_page(page);
 	return err;

include/linux/pagemap.h

@@ -1066,12 +1066,6 @@ static inline void folio_cancel_dirty(struct folio *folio)
 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);
 

mm/page-writeback.c

@@ -2583,46 +2583,6 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
 	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.
  */