+static struct file *
+__nfs4_get_fd(struct nfs4_file *f, int oflag)
+{
+ if (f->fi_fds[oflag])
+ return get_file(f->fi_fds[oflag]);
+ return NULL;
+}
+
+static struct file *
+find_writeable_file_locked(struct nfs4_file *f)
+{
+ struct file *ret;
+
+ lockdep_assert_held(&f->fi_lock);
+
+ ret = __nfs4_get_fd(f, O_WRONLY);
+ if (!ret)
+ ret = __nfs4_get_fd(f, O_RDWR);
+ return ret;
+}
+
+static struct file *
+find_writeable_file(struct nfs4_file *f)
+{
+ struct file *ret;
+
+ spin_lock(&f->fi_lock);
+ ret = find_writeable_file_locked(f);
+ spin_unlock(&f->fi_lock);
+
+ return ret;
+}
+
+static struct file *find_readable_file_locked(struct nfs4_file *f)
+{
+ struct file *ret;
+
+ lockdep_assert_held(&f->fi_lock);
+
+ ret = __nfs4_get_fd(f, O_RDONLY);
+ if (!ret)
+ ret = __nfs4_get_fd(f, O_RDWR);
+ return ret;
+}
+
+static struct file *
+find_readable_file(struct nfs4_file *f)
+{
+ struct file *ret;
+
+ spin_lock(&f->fi_lock);
+ ret = find_readable_file_locked(f);
+ spin_unlock(&f->fi_lock);
+
+ return ret;
+}
+
+static struct file *
+find_any_file(struct nfs4_file *f)
+{
+ struct file *ret;
+
+ spin_lock(&f->fi_lock);
+ ret = __nfs4_get_fd(f, O_RDWR);
+ if (!ret) {
+ ret = __nfs4_get_fd(f, O_WRONLY);
+ if (!ret)
+ ret = __nfs4_get_fd(f, O_RDONLY);
+ }
+ spin_unlock(&f->fi_lock);
+ return ret;
+}
+
+static atomic_long_t num_delegations;