Input: appletouch - fix idle reset logic

[sfrench/cifs-2.6.git] / mm / truncate.c

diff --git a/mm/truncate.c b/mm/truncate.c
index ebf3fcb4115b8c664e54e4c47e02968ed93ab0be..f47e46d1be3b1d9f42b1e83057bf696a3469df27 100644 (file)
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -12,6 +12,7 @@
 #include <linux/swap.h>
 #include <linux/module.h>
 #include <linux/pagemap.h>
+#include <linux/highmem.h>
 #include <linux/pagevec.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/buffer_head.h> /* grr. try_to_release_page,
@@ -46,7 +47,7 @@ void do_invalidatepage(struct page *page, unsigned long offset)
 
 static inline void truncate_partial_page(struct page *page, unsigned partial)
 {
-       memclear_highpage_flush(page, partial, PAGE_CACHE_SIZE-partial);
+       zero_user_page(page, partial, PAGE_CACHE_SIZE - partial, KM_USER0);
        if (PagePrivate(page))
                do_invalidatepage(page, partial);
 }
@@ -99,9 +100,9 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
        if (PagePrivate(page))
                do_invalidatepage(page, 0);
 
+       remove_from_page_cache(page);
        ClearPageUptodate(page);
        ClearPageMappedToDisk(page);
-       remove_from_page_cache(page);
        page_cache_release(page);       /* pagecache ref */
 }
 
@@ -252,21 +253,8 @@ void truncate_inode_pages(struct address_space *mapping, loff_t lstart)
 }
 EXPORT_SYMBOL(truncate_inode_pages);
 
-/**
- * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
- * @mapping: the address_space which holds the pages to invalidate
- * @start: the offset 'from' which to invalidate
- * @end: the offset 'to' which to invalidate (inclusive)
- *
- * This function only removes the unlocked pages, if you want to
- * remove all the pages of one inode, you must call truncate_inode_pages.
- *
- * invalidate_mapping_pages() will not block on IO activity. It will not
- * invalidate pages which are dirty, locked, under writeback or mapped into
- * pagetables.
- */
-unsigned long invalidate_mapping_pages(struct address_space *mapping,
-                               pgoff_t start, pgoff_t end)
+unsigned long __invalidate_mapping_pages(struct address_space *mapping,
+                               pgoff_t start, pgoff_t end, bool be_atomic)
 {
        struct pagevec pvec;
        pgoff_t next = start;
@@ -307,17 +295,38 @@ unlock:
                                break;
                }
                pagevec_release(&pvec);
+               if (likely(!be_atomic))
+                       cond_resched();
        }
        return ret;
 }
+
+/**
+ * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
+ * @mapping: the address_space which holds the pages to invalidate
+ * @start: the offset 'from' which to invalidate
+ * @end: the offset 'to' which to invalidate (inclusive)
+ *
+ * This function only removes the unlocked pages, if you want to
+ * remove all the pages of one inode, you must call truncate_inode_pages.
+ *
+ * invalidate_mapping_pages() will not block on IO activity. It will not
+ * invalidate pages which are dirty, locked, under writeback or mapped into
+ * pagetables.
+ */
+unsigned long invalidate_mapping_pages(struct address_space *mapping,
+                               pgoff_t start, pgoff_t end)
+{
+       return __invalidate_mapping_pages(mapping, start, end, false);
+}
 EXPORT_SYMBOL(invalidate_mapping_pages);
 
 /*
  * This is like invalidate_complete_page(), except it ignores the page's
  * refcount.  We do this because invalidate_inode_pages2() needs stronger
  * invalidation guarantees, and cannot afford to leave pages behind because
- * shrink_list() has a temp ref on them, or because they're transiently sitting
- * in the lru_cache_add() pagevecs.
+ * shrink_page_list() has a temp ref on them, or because they're transiently
+ * sitting in the lru_cache_add() pagevecs.
  */
 static int
 invalidate_complete_page2(struct address_space *mapping, struct page *page)
@@ -375,10 +384,10 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
 
        pagevec_init(&pvec, 0);
        next = start;
-       while (next <= end && !ret && !wrapped &&
+       while (next <= end && !wrapped &&
                pagevec_lookup(&pvec, mapping, next,
                        min(end - next, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
-               for (i = 0; !ret && i < pagevec_count(&pvec); i++) {
+               for (i = 0; i < pagevec_count(&pvec); i++) {
                        struct page *page = pvec.pages[i];
                        pgoff_t page_index;