[PATCH] mpage_writepages() page locking fix

When ->writepage() returns WRITEPAGE_ACTIVATE, the page is still locked.
Explicitly unlock the page in mpage_writepages().

Signed-off-by: Nikita Danilov <nikita@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/mpage.c b/fs/mpage.c
index e7d8d1a77606..3923facf94eb 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -727,6 +727,8 @@ retry:
                                                 &last_block_in_bio, &ret, wbc,
                                                 writepage_fn);
                         }
+                        if (unlikely(ret == WRITEPAGE_ACTIVATE))
+                                unlock_page(page);
                         if (ret || (--(wbc->nr_to_write) <= 0))
                                 done = 1;
                         if (wbc->nonblocking && bdi_write_congested(bdi)) {