mm: hugetlbfs_pagecache_present

	return find_lock_page(mapping, idx);

}

/* Return whether there is a pagecache page to back given address within VMA */

static bool hugetlbfs_backed(struct hstate *h,

/*

 * Return whether there is a pagecache page to back given address within VMA.

 * Caller follow_hugetlb_page() holds page_table_lock so we cannot lock_page.

 */

static bool hugetlbfs_pagecache_present(struct hstate *h,

			struct vm_area_struct *vma, unsigned long address)

{

	struct address_space *mapping;

		/*

		 * When coredumping, it suits get_dump_page if we just return

		 * an error if there's a hole and no huge pagecache to back it.

		 * an error where there's an empty slot with no huge pagecache

		 * to back it.  This way, we avoid allocating a hugepage, and

		 * the sparse dumpfile avoids allocating disk blocks, but its

		 * huge holes still show up with zeroes where they need to be.

		 */

		if (absent &&

		    ((flags & FOLL_DUMP) && !hugetlbfs_backed(h, vma, vaddr))) {

		if (absent && (flags & FOLL_DUMP) &&

		    !hugetlbfs_pagecache_present(h, vma, vaddr)) {

			remainder = 0;

			break;

		}