Add balance_dirty_pages_ratelimited() to cont_expand_zero()
On the systems, ftruncate() which expand size for FAT became the cause
of OOM. The cont_expand_zero() filled all memory with dirty pages,
and since disk is very slow, limit of page scanning was exceeded, then
it triggered OOM.
This adds balance_dirty_pages_ratelimited() to avoid filling memory
with dirty pages.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/buffer.c b/fs/buffer.c
index 7d51e64..3db4a26 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2246,6 +2246,8 @@
goto out;
BUG_ON(err != len);
err = 0;
+
+ balance_dirty_pages_ratelimited(mapping);
}
/* page covers the boundary, find the boundary offset */