ceph: clean up useless d_parent checks

d_parent is never NULL, and IS_ROOT() is the proper way to check for a
(non-self-referential) parent.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Sage Weil <sage@inktank.com>

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 3e8094b..6a66bd2 100644 (file)
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -51,8 +51,7 @@ int ceph_init_dentry(struct dentry *dentry)
                goto out_unlock;
        }
 
-       if (dentry->d_parent == NULL ||   /* nfs fh_to_dentry */
-           ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
+       if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
                d_set_d_op(dentry, &ceph_dentry_ops);
        else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
                d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
@@ -79,7 +78,7 @@ struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
                return NULL;
 
        spin_lock(&dentry->d_lock);
-       if (dentry->d_parent) {
+       if (!IS_ROOT(dentry)) {
                inode = dentry->d_parent->d_inode;
                ihold(inode);
        }
@@ -1140,7 +1139,7 @@ static void ceph_d_prune(struct dentry *dentry)
        dout("ceph_d_prune %p\n", dentry);
 
        /* do we have a valid parent? */
-       if (!dentry->d_parent || IS_ROOT(dentry))
+       if (IS_ROOT(dentry))
                return;
 
        /* if we are not hashed, we don't affect D_COMPLETE */

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 5ac6434..418f6a8 100644 (file)
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1469,11 +1469,6 @@ retry:
                else
                        len += 1 + temp->d_name.len;
                temp = temp->d_parent;
-               if (temp == NULL) {
-                       rcu_read_unlock();
-                       pr_err("build_path corrupt dentry %p\n", dentry);
-                       return ERR_PTR(-EINVAL);
-               }
        }
        rcu_read_unlock();
        if (len)
@@ -1510,12 +1505,6 @@ retry:
                if (pos)
                        path[--pos] = '/';
                temp = temp->d_parent;
-               if (temp == NULL) {
-                       rcu_read_unlock();
-                       pr_err("build_path corrupt dentry\n");
-                       kfree(path);
-                       return ERR_PTR(-EINVAL);
-               }
        }
        rcu_read_unlock();
        if (pos != 0 || read_seqretry(&rename_lock, seq)) {