Chris Mason <[email protected]> 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 <[email protected]>
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