Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [12/21] HWPOISON: Add invalidate_inode_page | Date | Fri, 11 Sep 2009 20:48:41 +0200 (CEST) |
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From: Wu Fengguang <fengguang.wu@intel.com>
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>
--- include/linux/mm.h | 2 ++ mm/truncate.c | 26 ++++++++++++++++++++------ 2 files changed, 22 insertions(+), 6 deletions(-)
Index: linux/include/linux/mm.h =================================================================== --- linux.orig/include/linux/mm.h +++ linux/include/linux/mm.h @@ -796,6 +796,8 @@ extern int vmtruncate_range(struct inode 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); Index: linux/mm/truncate.c =================================================================== --- linux.orig/mm/truncate.c +++ linux/mm/truncate.c @@ -146,6 +146,24 @@ int truncate_inode_page(struct address_s 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(s 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;
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