X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=mm%2Ftruncate.c;h=7c994f2d614519df007e16eb93f1a8a393589a2e;hb=b2ff457b09554813a7df9e0cd30d5a169a257419;hp=5df947de7654461d43f1ba0a7ab80b46747239c8;hpb=d5112a4f31a361409d3c57dc9d58dd69f8014bef;p=~andy%2Flinux

diff --git a/mm/truncate.c b/mm/truncate.c
index 5df947de765..7c994f2d614 100644
--- 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);
 }
@@ -85,7 +86,7 @@ EXPORT_SYMBOL(cancel_dirty_page);
  *
  * We need to bale out if page->mapping is no longer equal to the original
  * mapping.  This happens a) when the VM reclaimed the page while we waited on
- * its lock, b) when a concurrent invalidate_inode_pages got there first and
+ * 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
@@ -106,7 +107,7 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
 }
 
 /*
- * This is for invalidate_inode_pages().  That function can be called at
+ * This is for invalidate_mapping_pages().  That function can be called at
  * any time, and is not supposed to throw away dirty pages.  But pages can
  * be marked dirty at any time too, so use remove_mapping which safely
  * discards clean, unused pages.
@@ -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;
@@ -307,22 +295,38 @@ unlock:
 				break;
 		}
 		pagevec_release(&pvec);
+		if (likely(!be_atomic))
+			cond_resched();
 	}
 	return ret;
 }
 
-unsigned long invalidate_inode_pages(struct address_space *mapping)
+/**
+ * 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, 0, ~0UL);
+	return __invalidate_mapping_pages(mapping, start, end, false);
 }
-EXPORT_SYMBOL(invalidate_inode_pages);
+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)
@@ -380,10 +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;