UBIFS: fix shrinker object count reports

Sometimes VM asks the shrinker to return amount of objects it can shrink,
and we return the ubifs_clean_zn_cnt in that case. However, it is possible
that this counter is negative for a short period of time, due to the way
UBIFS TNC code updates it. And I can observe the following warnings sometimes:

shrink_slab: ubifs_shrinker+0x0/0x2b7 [ubifs] negative objects to delete nr=-8541616642706119788

This patch makes sure UBIFS never returns negative count of objects.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Cc: stable@kernel.org

diff --git a/fs/ubifs/shrinker.c b/fs/ubifs/shrinker.c
index ca953a945029ad38ab770845e80b165f8d09a8e2..9e1d05666fed5d1ad03589995f8ecb3f78ec7b82 100644 (file)
--- a/fs/ubifs/shrinker.c
+++ b/fs/ubifs/shrinker.c
@@ -284,7 +284,11 @@ int ubifs_shrinker(struct shrinker *shrink, struct shrink_control *sc)
        long clean_zn_cnt = atomic_long_read(&ubifs_clean_zn_cnt);
 
        if (nr == 0)
-               return clean_zn_cnt;
+               /*
+                * Due to the way UBIFS updates the clean znode counter it may
+                * temporarily be negative.
+                */
+               return clean_zn_cnt >= 0 ? clean_zn_cnt : 1;
 
        if (!clean_zn_cnt) {
                /*