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HWPOISON: Refactor truncate to allow direct truncating of page v2 

Extract out truncate_inode_page() out of the truncate path so that
it can be used by memory-failure.c

[AK: description, headers, fix typos]
v2: Some white space changes from Fengguang Wu

Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Nick Piggin 2009-09-16 11:50:12 +02:00 committed by Andi Kleen
parent 2a7684a23e
commit 750b4987b0
2 changed files with 17 additions and 14 deletions
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2
include/linux/mm.h
View File

@ -794,6 +794,8 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping,
extern int vmtruncate(struct inode * inode, loff_t offset);
extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end);
int truncate_inode_page(struct address_space *mapping, 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);

29
mm/truncate.c
View File

@ -93,11 +93,11 @@ EXPORT_SYMBOL(cancel_dirty_page);
* its lock, b) when a concurrent invalidate_mapping_pages got there first and
* c) when tmpfs swizzles a page between a tmpfs inode and swapper_space.
*/
static void
static int
truncate_complete_page(struct address_space *mapping, struct page *page)
{
if (page->mapping != mapping)
return;
return -EIO;
if (page_has_private(page))
do_invalidatepage(page, 0);
@ -108,6 +108,7 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
remove_from_page_cache(page);
ClearPageMappedToDisk(page);
page_cache_release(page); /* pagecache ref */
return 0;
}
/*
@ -135,6 +136,16 @@ invalidate_complete_page(struct address_space *mapping, struct page *page)
return ret;
}
int truncate_inode_page(struct address_space *mapping, struct page *page)
{
if (page_mapped(page)) {
unmap_mapping_range(mapping,
(loff_t)page->index << PAGE_CACHE_SHIFT,
PAGE_CACHE_SIZE, 0);
}
return truncate_complete_page(mapping, page);
}
/**
* truncate_inode_pages - truncate range of pages specified by start & end byte offsets
* @mapping: mapping to truncate
@ -196,12 +207,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
unlock_page(page);
continue;
}
if (page_mapped(page)) {
unmap_mapping_range(mapping,
(loff_t)page_index<<PAGE_CACHE_SHIFT,
PAGE_CACHE_SIZE, 0);
}
truncate_complete_page(mapping, page);
truncate_inode_page(mapping, page);
unlock_page(page);
}
pagevec_release(&pvec);
@ -238,15 +244,10 @@ void truncate_inode_pages_range(struct address_space *mapping,
break;
lock_page(page);
wait_on_page_writeback(page);
if (page_mapped(page)) {
unmap_mapping_range(mapping,
(loff_t)page->index<<PAGE_CACHE_SHIFT,
PAGE_CACHE_SIZE, 0);
}
truncate_inode_page(mapping, page);
if (page->index > next)
next = page->index;
next++;
truncate_complete_page(mapping, page);
unlock_page(page);
}
pagevec_release(&pvec);