[PATCH v1 7/8] Make drop_caches flush pending dput()s and iput()s

[Mike Waychison <mikew@google.com>]

When doing echo 3 > /proc/sys/vm/drop_caches, we wish to free up as much inode
and dentry slab as possible.  This path is updated to flush any pending iputs
and dputs once the shrinkers are called.

Signed-off-by: Mike Waychison <mikew@google.com>
---

 fs/drop_caches.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 3e5637f..1e47470 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -60,6 +60,7 @@ static void drop_slab(void)
 	do {
 		nr_objects = shrink_slab(1000, GFP_KERNEL, 1000);
 	} while (nr_objects > 10);
+	dput_drain_all();
 }
 
 int drop_caches_sysctl_handler(ctl_table *table, int write,