Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [11/19] HWPOISON: Refactor truncate to allow direct truncating of page v2 | Date | Wed, 5 Aug 2009 11:36:38 +0200 (CEST) |
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From: Nick Piggin <npiggin@suse.de>
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>
--- include/linux/mm.h | 2 ++ mm/truncate.c | 29 +++++++++++++++-------------- 2 files changed, 17 insertions(+), 14 deletions(-)
Index: linux/mm/truncate.c =================================================================== --- linux.orig/mm/truncate.c +++ linux/mm/truncate.c @@ -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_sp remove_from_page_cache(page); ClearPageMappedToDisk(page); page_cache_release(page); /* pagecache ref */ + return 0; } /* @@ -135,6 +136,16 @@ invalidate_complete_page(struct address_ 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 a 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 a 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); Index: linux/include/linux/mm.h =================================================================== --- linux.orig/include/linux/mm.h +++ linux/include/linux/mm.h @@ -809,6 +809,8 @@ static inline void unmap_shared_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);
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