diff options
author | Wu Fengguang <fengguang.wu@intel.com> | 2009-09-16 13:50:13 +0400 |
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committer | Andi Kleen <ak@linux.intel.com> | 2009-09-16 13:50:13 +0400 |
commit | 83f786680aec8d030184f7ced1a0a3dd8ac81764 (patch) | |
tree | c519509ce47883936bc4759343b1b3a01749153f /mm/truncate.c | |
parent | 750b4987b0cd4d408e54cb83a80a067cbe690feb (diff) | |
download | linux-83f786680aec8d030184f7ced1a0a3dd8ac81764.tar.xz |
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>
Diffstat (limited to 'mm/truncate.c')
-rw-r--r-- | mm/truncate.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/mm/truncate.c b/mm/truncate.c index 2519a7c92873..ea132f7ea2d2 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -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; |