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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: Andi Kleen <ak@linux.intel.com>
hifive-unleashed-5.1
Wu Fengguang 2009-09-16 11:50:13 +02:00 committed by Andi Kleen
parent 750b4987b0
commit 83f786680a
2 changed files with 22 additions and 6 deletions
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2
include/linux/mm.h
View File

@ -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);

26
mm/truncate.c
View File

@ -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;