Re: o_sync in vfat driver

[OGAWA Hirofumi]

Chris Mason <mason@xxxxxxxx> writes:

> filemap_fdatawrite() won't redirty the page.  It will wait on the pending 
> writeback.

Umm... I'm looking the following code.

+	if (MSDOS_SB(sb)->options.flush) {
+		writeback_inode(dir);
+		writeback_inode(inode);
+		writeback_bdev(sb);
+	}

+void
+writeback_bdev(struct super_block *sb)
+{
+	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
+	filemap_flush(mapping);
+	blk_run_address_space(mapping);
+}
+EXPORT_SYMBOL_GPL(writeback_bdev);

filemap_flush() is using WB_SYNC_NONE.

in mpage_writepages()
			if (wbc->sync_mode != WB_SYNC_NONE)
				wait_on_page_writeback(page);

			if (PageWriteback(page) ||
					!clear_page_dirty_for_io(page)) {
				unlock_page(page);
				continue;
			}

Where does wait it?
--
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
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