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authorWu Fengguang <fengguang.wu@intel.com>2009-09-16 11:50:13 +0200
committerAndi Kleen <ak@linux.intel.com>2009-09-16 11:50:13 +0200
commit83f786680aec8d030184f7ced1a0a3dd8ac81764 (patch)
treec519509ce47883936bc4759343b1b3a01749153f /mm/truncate.c
parent750b4987b0cd4d408e54cb83a80a067cbe690feb (diff)
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.c26
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;

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