btrfs: Remove code referencing unused TRANS_USERSPACE

[sfrench/cifs-2.6.git] / fs / dcache.c

diff --git a/fs/dcache.c b/fs/dcache.c
index 7c38f39958bc371d0324197968a732d68da927d8..8945e6cabd93f7ce42709f93b90db94dceb74273 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -647,11 +647,16 @@ again:
                spin_unlock(&parent->d_lock);
                goto again;
        }
-       rcu_read_unlock();
-       if (parent != dentry)
+       if (parent != dentry) {
                spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
-       else
+               if (unlikely(dentry->d_lockref.count < 0)) {
+                       spin_unlock(&parent->d_lock);
+                       parent = NULL;
+               }
+       } else {
                parent = NULL;
+       }
+       rcu_read_unlock();
        return parent;
 }
 
@@ -2474,7 +2479,7 @@ struct dentry *d_alloc_parallel(struct dentry *parent,
 
 retry:
        rcu_read_lock();
-       seq = smp_load_acquire(&parent->d_inode->i_dir_seq) & ~1;
+       seq = smp_load_acquire(&parent->d_inode->i_dir_seq);
        r_seq = read_seqbegin(&rename_lock);
        dentry = __d_lookup_rcu(parent, name, &d_seq);
        if (unlikely(dentry)) {
@@ -2495,8 +2500,14 @@ retry:
                rcu_read_unlock();
                goto retry;
        }
+
+       if (unlikely(seq & 1)) {
+               rcu_read_unlock();
+               goto retry;
+       }
+
        hlist_bl_lock(b);
-       if (unlikely(parent->d_inode->i_dir_seq != seq)) {
+       if (unlikely(READ_ONCE(parent->d_inode->i_dir_seq) != seq)) {
                hlist_bl_unlock(b);
                rcu_read_unlock();
                goto retry;