diff --git a/mm/truncate.c b/mm/truncate.c
index fdba083..57a5ea3 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -52,14 +52,6 @@ void do_invalidatepage(struct page *page, unsigned int offset,
 		(*invalidatepage)(page, offset, length);
 }
 
-static inline void truncate_partial_page(struct page *page, unsigned partial)
-{
-	zero_user_segment(page, partial, PAGE_CACHE_SIZE);
-	cleancache_invalidate_page(page->mapping, page);
-	if (page_has_private(page))
-		do_invalidatepage(page, partial, PAGE_CACHE_SIZE - partial);
-}
-
 /*
  * This cancels just the dirty bit on the kernel page itself, it
  * does NOT actually remove dirty bits on any mmap's that may be
@@ -191,8 +183,8 @@ int invalidate_inode_page(struct page *page)
  * @lend: offset to which to truncate
  *
  * Truncate the page cache, removing the pages that are between
- * specified offsets (and zeroing out partial page
- * (if lstart is not page aligned)).
+ * specified offsets (and zeroing out partial pages
+ * if lstart or lend + 1 is not page aligned).
  *
  * Truncate takes two passes - the first pass is nonblocking.  It will not
  * block on page locks and it will not block on writeback.  The second pass
@@ -203,35 +195,40 @@ int invalidate_inode_page(struct page *page)
  * We pass down the cache-hot hint to the page freeing code.  Even if the
  * mapping is large, it is probably the case that the final pages are the most
  * recently touched, and freeing happens in ascending file offset order.
+ *
+ * Note that since ->invalidatepage() accepts range to invalidate
+ * truncate_inode_pages_range is able to handle cases where lend + 1 is not
+ * page aligned properly.
  */
 void truncate_inode_pages_range(struct address_space *mapping,
 				loff_t lstart, loff_t lend)
 {
-	const pgoff_t start = (lstart + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
-	const unsigned partial = lstart & (PAGE_CACHE_SIZE - 1);
+	pgoff_t start = (lstart + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+	pgoff_t end = (lend + 1) >> PAGE_CACHE_SHIFT;
+	unsigned int partial_start = lstart & (PAGE_CACHE_SIZE - 1);
+	unsigned int partial_end = (lend + 1) & (PAGE_CACHE_SIZE - 1);
 	struct pagevec pvec;
 	pgoff_t index;
-	pgoff_t end;
 	int i;
 
 	cleancache_invalidate_inode(mapping);
 	if (mapping->nrpages == 0)
 		return;
 
-	BUG_ON((lend & (PAGE_CACHE_SIZE - 1)) != (PAGE_CACHE_SIZE - 1));
-	end = (lend >> PAGE_CACHE_SHIFT);
+	if (lend == -1)
+		end = -1;	/* unsigned, so actually very big */
 
 	pagevec_init(&pvec, 0);
 	index = start;
-	while (index <= end && pagevec_lookup(&pvec, mapping, index,
-			min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
+	while (index < end && pagevec_lookup(&pvec, mapping, index,
+			min(end - index, (pgoff_t)PAGEVEC_SIZE))) {
 		mem_cgroup_uncharge_start();
 		for (i = 0; i < pagevec_count(&pvec); i++) {
 			struct page *page = pvec.pages[i];
 
 			/* We rely upon deletion not changing page->index */
 			index = page->index;
-			if (index > end)
+			if (index >= end)
 				break;
 
 			if (!trylock_page(page))
@@ -250,27 +247,51 @@ void truncate_inode_pages_range(struct address_space *mapping,
 		index++;
 	}
 
-	if (partial) {
+	if (partial_start) {
 		struct page *page = find_lock_page(mapping, start - 1);
 		if (page) {
+			unsigned int top = PAGE_CACHE_SIZE;
+			if (start > end) {
+				top = partial_end;
+				partial_end = 0;
+			}
+			wait_on_page_writeback(page);
+			zero_user_segment(page, partial_start, top);
+			cleancache_invalidate_page(mapping, page);
+			if (page_has_private(page))
+				do_invalidatepage(page, partial_start,
+						  top - partial_start);
+			unlock_page(page);
+			page_cache_release(page);
+		}
+	}
+	if (partial_end) {
+		struct page *page = find_lock_page(mapping, end);
+		if (page) {
 			wait_on_page_writeback(page);
-			truncate_partial_page(page, partial);
+			zero_user_segment(page, 0, partial_end);
+			cleancache_invalidate_page(mapping, page);
+			if (page_has_private(page))
+				do_invalidatepage(page, 0,
+						  partial_end);
 			unlock_page(page);
 			page_cache_release(page);
 		}
 	}
+	if (start >= end)
+		return;
 
 	index = start;
 	for ( ; ; ) {
 		cond_resched();
 		if (!pagevec_lookup(&pvec, mapping, index,
-			min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
+			min(end - index, (pgoff_t)PAGEVEC_SIZE))) {
 			if (index == start)
 				break;
 			index = start;
 			continue;
 		}
-		if (index == start && pvec.pages[0]->index > end) {
+		if (index == start && pvec.pages[0]->index >= end) {
 			pagevec_release(&pvec);
 			break;
 		}
@@ -280,7 +301,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
 
 			/* We rely upon deletion not changing page->index */
 			index = page->index;
-			if (index > end)
+			if (index >= end)
 				break;
 
 			lock_page(page);
@@ -601,10 +622,8 @@ void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend)
 	 * This rounding is currently just for example: unmap_mapping_range
 	 * expands its hole outwards, whereas we want it to contract the hole
 	 * inwards.  However, existing callers of truncate_pagecache_range are
-	 * doing their own page rounding first; and truncate_inode_pages_range
-	 * currently BUGs if lend is not pagealigned-1 (it handles partial
-	 * page at start of hole, but not partial page at end of hole).  Note
-	 * unmap_mapping_range allows holelen 0 for all, and we allow lend -1.
+	 * doing their own page rounding first.  Note that unmap_mapping_range
+	 * allows holelen 0 for all, and we allow lend -1 for end of file.
 	 */
 
 	/*