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Commit 83f78668 authored by Wu Fengguang's avatar Wu Fengguang Committed by Andi Kleen
Browse files

HWPOISON: Add invalidate_inode_page 



Add a simple way to invalidate a single page
This is just a refactoring of the truncate.c code.
Originally from Fengguang, modified by Andi Kleen.

Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
parent 750b4987

include/linux/mm.h

+2 −0
Original line number Diff line number Diff line
@@ -796,6 +796,8 @@ extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end); 


int truncate_inode_page(struct address_space *mapping, struct page *page);



int invalidate_inode_page(struct page *page);



#ifdef CONFIG_MMU

extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,

			unsigned long address, unsigned int flags);

mm/truncate.c

+20 −6
Original line number Diff line number Diff line
@@ -146,6 +146,24 @@ int truncate_inode_page(struct address_space *mapping, struct page *page) 
	return truncate_complete_page(mapping, page);

}



/*

 * Safely invalidate one page from its pagecache mapping.

 * It only drops clean, unused pages. The page must be locked.

 *

 * Returns 1 if the page is successfully invalidated, otherwise 0.

 */

int invalidate_inode_page(struct page *page)

{

	struct address_space *mapping = page_mapping(page);

	if (!mapping)

		return 0;

	if (PageDirty(page) || PageWriteback(page))

		return 0;

	if (page_mapped(page))

		return 0;

	return invalidate_complete_page(mapping, page);

}



/**

 * truncate_inode_pages - truncate range of pages specified by start & end byte offsets

 * @mapping: mapping to truncate
@@ -312,12 +330,8 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping, 
			if (lock_failed)

				continue;



			if (PageDirty(page) || PageWriteback(page))

				goto unlock;

			if (page_mapped(page))

				goto unlock;

			ret += invalidate_complete_page(mapping, page);

unlock:

			ret += invalidate_inode_page(page);



			unlock_page(page);

			if (next > end)

				break;