Merge tag 'pull-d_add' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull dentry d_add() cleanups from Al Viro:
 "This converts a bunch of unidiomatic uses of d_add() in ->lookup()
  instances to equivalent uses of d_splice_alias(), which is the normal
  mechanism for ->lookup()"

* tag 'pull-d_add' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  gfs2: use d_splice_alias() for ->lookup() return value
  ntfs: use d_splice_alias() for ->lookup() return value
  simple_lookup(): use d_splice_alias() for ->lookup() return value
  ecryptfs: use d_splice_alias() for ->lookup() return value
  configfs_lookup(): switch to d_splice_alias()
  tracefs: use d_splice_alias() in ->lookup() instances

fs/configfs/dir.c

@@ -501,8 +501,7 @@ static struct dentry * configfs_lookup(struct inode *dir,
 	}
 	spin_unlock(&configfs_dirent_lock);
 done:
-	d_add(dentry, inode);
-	return NULL;
+	return d_splice_alias(inode, dentry);
 }
 
 /*

fs/ecryptfs/inode.c

@@ -350,11 +350,9 @@ static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry,
 	 */
 	lower_inode = READ_ONCE(lower_dentry->d_inode);
 
-	if (!lower_inode) {
-		/* We want to add because we couldn't find in lower */
-		d_add(dentry, NULL);
-		return NULL;
-	}
+	if (!lower_inode) /* We want to add because we couldn't find in lower */
+		return d_splice_alias(NULL, dentry);
+
 	inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb);
 	if (IS_ERR(inode)) {
 		printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",

fs/gfs2/inode.c

@@ -994,12 +994,8 @@ static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
 	int error;
 
 	inode = gfs2_lookupi(dir, &dentry->d_name, 0);
-	if (inode == NULL) {
-		d_add(dentry, NULL);
-		return NULL;
-	}
-	if (IS_ERR(inode))
-		return ERR_CAST(inode);
+	if (inode == NULL || IS_ERR(inode))
+		return d_splice_alias(inode, dentry);
 
 	gl = GFS2_I(inode)->i_gl;
 	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);

fs/libfs.c

@@ -78,8 +78,7 @@ struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, unsigned
 	if (IS_ENABLED(CONFIG_UNICODE) && IS_CASEFOLDED(dir))
 		return NULL;
 
-	d_add(dentry, NULL);
-	return NULL;
+	return d_splice_alias(NULL, dentry);
 }
 EXPORT_SYMBOL(simple_lookup);
 

fs/ntfs/namei.c

@@ -230,9 +230,8 @@ static struct dentry *ntfs_lookup(struct inode *dir_ino, struct dentry *dent,
 	if (MREF_ERR(mref) == -ENOENT) {
 		ntfs_debug("Entry was not found, adding negative dentry.");
 		/* The dcache will handle negative entries. */
-		d_add(dent, NULL);
 		ntfs_debug("Done.");
-		return NULL;
+		return d_splice_alias(NULL, dent);
 	}
 	ntfs_error(vol->sb, "ntfs_lookup_ino_by_name() failed with error code %i.",
 			-MREF_ERR(mref));

fs/tracefs/event_inode.c

@@ -389,8 +389,7 @@ static struct dentry *lookup_file(struct eventfs_inode *parent_ei,
 	// Files have their parent's ei as their fsdata
 	dentry->d_fsdata = get_ei(parent_ei);
 
-	d_add(dentry, inode);
-	return NULL;
+	return d_splice_alias(inode, dentry);
 };
 
 /**
@@ -420,8 +419,7 @@ static struct dentry *lookup_dir_entry(struct dentry *dentry,
 
 	dentry->d_fsdata = get_ei(ei);
 
-	d_add(dentry, inode);
-	return NULL;
+	return d_splice_alias(inode, dentry);
 }
 
 static inline struct eventfs_inode *init_ei(struct eventfs_inode *ei, const char *name)