fs: dcache scale dentry refcount

Make d_count non-atomic and protect it with d_lock. This allows us to ensure a
0 refcount dentry remains 0 without dcache_lock. It is also fairly natural when
we start protecting many other dentry members with d_lock.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index a1ed7a7cb173..5e5c7ec1fc98 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -260,7 +260,7 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
                                    ecryptfs_dentry->d_parent));
         lower_inode = lower_dentry->d_inode;
         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
-        BUG_ON(!atomic_read(&lower_dentry->d_count));
+        BUG_ON(!lower_dentry->d_count);
         ecryptfs_set_dentry_private(ecryptfs_dentry,
                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
                                                      GFP_KERNEL));