new helper: done_path_create()

releases what needs to be released after {kern,user}_path_create()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/powerpc/platforms/cell/spufs/syscalls.c

@@ -70,9 +70,7 @@ static long do_spu_create(const char __user *pathname, unsigned int flags,
 	ret = PTR_ERR(dentry);
 	if (!IS_ERR(dentry)) {
 		ret = spufs_create(&path, dentry, flags, mode, neighbor);
-		mutex_unlock(&path.dentry->d_inode->i_mutex);
-		dput(dentry);
-		path_put(&path);
+		done_path_create(&path, dentry);
 	}
 
 	return ret;

drivers/base/devtmpfs.c

@@ -156,9 +156,7 @@ static int dev_mkdir(const char *name, umode_t mode)
 	if (!err)
 		/* mark as kernel-created inode */
 		dentry->d_inode->i_private = &thread;
-	dput(dentry);
-	mutex_unlock(&path.dentry->d_inode->i_mutex);
-	path_put(&path);
+	done_path_create(&path, dentry);
 	return err;
 }
 
@@ -218,10 +216,7 @@ static int handle_create(const char *nodename, umode_t mode, struct device *dev)
 		/* mark as kernel-created inode */
 		dentry->d_inode->i_private = &thread;
 	}
-	dput(dentry);
-
-	mutex_unlock(&path.dentry->d_inode->i_mutex);
-	path_put(&path);
+	done_path_create(&path, dentry);
 	return err;
 }
 

fs/namei.c

@@ -2893,6 +2893,14 @@ struct dentry *kern_path_create(int dfd, const char *pathname, struct path *path
 }
 EXPORT_SYMBOL(kern_path_create);
 
+void done_path_create(struct path *path, struct dentry *dentry)
+{
+	dput(dentry);
+	mutex_unlock(&path->dentry->d_inode->i_mutex);
+	path_put(path);
+}
+EXPORT_SYMBOL(done_path_create);
+
 struct dentry *user_path_create(int dfd, const char __user *pathname, struct path *path, int is_dir)
 {
 	char *tmp = getname(pathname);
@@ -2989,9 +2997,7 @@ SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, umode_t, mode,
 out_drop_write:
 	mnt_drop_write(path.mnt);
 out_dput:
-	dput(dentry);
-	mutex_unlock(&path.dentry->d_inode->i_mutex);
-	path_put(&path);
+	done_path_create(&path, dentry);
 
 	return error;
 }
@@ -3048,9 +3054,7 @@ SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
 out_drop_write:
 	mnt_drop_write(path.mnt);
 out_dput:
-	dput(dentry);
-	mutex_unlock(&path.dentry->d_inode->i_mutex);
-	path_put(&path);
+	done_path_create(&path, dentry);
 	return error;
 }
 
@@ -3334,9 +3338,7 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
 out_drop_write:
 	mnt_drop_write(path.mnt);
 out_dput:
-	dput(dentry);
-	mutex_unlock(&path.dentry->d_inode->i_mutex);
-	path_put(&path);
+	done_path_create(&path, dentry);
 out_putname:
 	putname(from);
 	return error;
@@ -3446,9 +3448,7 @@ SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,
 out_drop_write:
 	mnt_drop_write(new_path.mnt);
 out_dput:
-	dput(new_dentry);
-	mutex_unlock(&new_path.dentry->d_inode->i_mutex);
-	path_put(&new_path);
+	done_path_create(&new_path, new_dentry);
 out:
 	path_put(&old_path);
 

fs/ocfs2/refcounttree.c

@@ -4477,9 +4477,7 @@ int ocfs2_reflink_ioctl(struct inode *inode,
 				  new_dentry, preserve);
 	mnt_drop_write(new_path.mnt);
 out_dput:
-	dput(new_dentry);
-	mutex_unlock(&new_path.dentry->d_inode->i_mutex);
-	path_put(&new_path);
+	done_path_create(&new_path, new_dentry);
 out:
 	path_put(&old_path);
 

include/linux/namei.h

@@ -67,6 +67,7 @@ extern int kern_path(const char *, unsigned, struct path *);
 
 extern struct dentry *kern_path_create(int, const char *, struct path *, int);
 extern struct dentry *user_path_create(int, const char __user *, struct path *, int);
+extern void done_path_create(struct path *, struct dentry *);
 extern struct dentry *kern_path_locked(const char *, struct path *);
 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
 			   const char *, unsigned int, struct path *);

net/unix/af_unix.c

@@ -887,8 +887,9 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 		mnt_drop_write(path.mnt);
 		if (err)
 			goto out_mknod_dput;
-		mutex_unlock(&path.dentry->d_inode->i_mutex);
-		dput(path.dentry);
+		mntget(path.mnt);
+		dget(dentry);
+		done_path_create(&path, dentry);
 		path.dentry = dentry;
 
 		addr->hash = UNIX_HASH_SIZE;
@@ -923,9 +924,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 	return err;
 
 out_mknod_dput:
-	dput(dentry);
-	mutex_unlock(&path.dentry->d_inode->i_mutex);
-	path_put(&path);
+	done_path_create(&path, dentry);
 out_mknod_parent:
 	if (err == -EEXIST)
 		err = -EADDRINUSE;