again, no dirty pages?

[bert hubert <ahu@ds9a.nl>]

This is my local version of mincore_page in filemap.c:

static unsigned char mincore_page(struct vm_area_struct * vma,
		unsigned long pgoff)
{
		unsigned char present = 0;
	struct address_space * as = &vma->vm_file->f_dentry->d_inode->i_data;
	struct page * page, ** hash = page_hash(as, pgoff);

	spin_lock(&pagecache_lock);
	page = __find_page_nolock(as, pgoff, *hash);
	if (page) {
	 	if(Page_Uptodate(page))
	                present |= 1;
	        if(PageDirty(page))
	                present |= 2;
	}

 	spin_unlock(&pagecache_lock);
 
 	return present;
}

But it never sets any bits for DirtyPages, even when I think there should be
dirty pages, for example, when I run "cat /dev/zero > file" and
simultaneously cinfo (http://ds9a.nl/cinfo) on the generated file.

My version of cinfo also looks for the second bit, but it never finds any
dirty pages.

Any clues? Thanks!

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