ext4: Release page references acquired in ext4_da_block_invalidatepages

We forget to release page references we acquire in
ext4_da_block_invalidatepages.  Luckily, this function gets called only if we
are not able to allocate blocks for delay-allocated data so that function
should better never be called.

Also cleanup handling of index variable.

Reported-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 3 insertions, 4 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c717a74f2178..f55df7192b95 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2157,17 +2157,16 @@ static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd,
                         break;
                 for (i = 0; i < nr_pages; i++) {
                         struct page *page = pvec.pages[i];
-                        index = page->index;
-                        if (index > end)
+                        if (page->index > end)
                                 break;
-                        index++;
-
                         BUG_ON(!PageLocked(page));
                         BUG_ON(PageWriteback(page));
                         block_invalidatepage(page, 0);
                         ClearPageUptodate(page);
                         unlock_page(page);
                 }
+                index = pvec.pages[nr_pages - 1]->index + 1;
+                pagevec_release(&pvec);
         }
         return;
 }