fs/dcache: Fix incorrect nr_dentry_unused accounting in shrink_dcache_sb()

The nr_dentry_unused per-cpu counter tracks dentries in both the LRU
lists and the shrink lists where the DCACHE_LRU_LIST bit is set.

The shrink_dcache_sb() function moves dentries from the LRU list to a
shrink list and subtracts the dentry count from nr_dentry_unused.  This
is incorrect as the nr_dentry_unused count will also be decremented in
shrink_dentry_list() via d_shrink_del().

To fix this double decrement, the decrement in the shrink_dcache_sb()
function is taken out.

Fixes: 4e717f5c1083 ("list_lru: remove special case function list_lru_dispose_all."
Cc: stable@kernel.org
Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 5 deletions

diff --git a/fs/dcache.c b/fs/dcache.c
index 2593153471cf..44e5652b2664 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1188,15 +1188,11 @@ static enum lru_status dentry_lru_isolate_shrink(struct list_head *item,
  */
 void shrink_dcache_sb(struct super_block *sb)
 {
-        long freed;
-
         do {
                 LIST_HEAD(dispose);
 
-                freed = list_lru_walk(&sb->s_dentry_lru,
+                list_lru_walk(&sb->s_dentry_lru,
                         dentry_lru_isolate_shrink, &dispose, 1024);
-
-                this_cpu_sub(nr_dentry_unused, freed);
                 shrink_dentry_list(&dispose);
         } while (list_lru_count(&sb->s_dentry_lru) > 0);
 }