Reduce path_lookup() abuses

... use kern_path() where possible

[folded a fix from rdd]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/scsi/osd/osd_uld.c

@@ -173,26 +173,26 @@ static const struct file_operations osd_fops = {
 	.unlocked_ioctl = osd_uld_ioctl,
 };
 
-struct osd_dev *osduld_path_lookup(const char *path)
+struct osd_dev *osduld_path_lookup(const char *name)
 {
-	struct nameidata nd;
+	struct path path;
 	struct inode *inode;
 	struct cdev *cdev;
 	struct osd_uld_device *uninitialized_var(oud);
 	int error;
 
-	if (!path || !*path) {
+	if (!name || !*name) {
 		OSD_ERR("Mount with !path || !*path\n");
 		return ERR_PTR(-EINVAL);
 	}
 
-	error = path_lookup(path, LOOKUP_FOLLOW, &nd);
+	error = kern_path(name, LOOKUP_FOLLOW, &path);
 	if (error) {
-		OSD_ERR("path_lookup of %s faild=>%d\n", path, error);
+		OSD_ERR("path_lookup of %s failed=>%d\n", name, error);
 		return ERR_PTR(error);
 	}
 
-	inode = nd.path.dentry->d_inode;
+	inode = path.dentry->d_inode;
 	error = -EINVAL; /* Not the right device e.g osd_uld_device */
 	if (!S_ISCHR(inode->i_mode)) {
 		OSD_DEBUG("!S_ISCHR()\n");
@@ -202,15 +202,15 @@ struct osd_dev *osduld_path_lookup(const char *path)
 	cdev = inode->i_cdev;
 	if (!cdev) {
 		OSD_ERR("Before mounting an OSD Based filesystem\n");
-		OSD_ERR("  user-mode must open+close the %s device\n", path);
-		OSD_ERR("  Example: bash: echo < %s\n", path);
+		OSD_ERR("  user-mode must open+close the %s device\n", name);
+		OSD_ERR("  Example: bash: echo < %s\n", name);
 		goto out;
 	}
 
 	/* The Magic wand. Is it our char-dev */
 	/* TODO: Support sg devices */
 	if (cdev->owner != THIS_MODULE) {
-		OSD_ERR("Error mounting %s - is not an OSD device\n", path);
+		OSD_ERR("Error mounting %s - is not an OSD device\n", name);
 		goto out;
 	}
 
@@ -220,7 +220,7 @@ struct osd_dev *osduld_path_lookup(const char *path)
 	error = 0;
 
 out:
-	path_put(&nd.path);
+	path_put(&path);
 	return error ? ERR_PTR(error) : &oud->od;
 }
 EXPORT_SYMBOL(osduld_path_lookup);

fs/gfs2/ops_fstype.c

@@ -1282,21 +1282,21 @@ static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 static struct super_block *get_gfs2_sb(const char *dev_name)
 {
 	struct super_block *sb;
-	struct nameidata nd;
+	struct path path;
 	int error;
 
-	error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
+	error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
 	if (error) {
 		printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
 		       dev_name, error);
 		return NULL;
 	}
-	sb = nd.path.dentry->d_inode->i_sb;
+	sb = path.dentry->d_inode->i_sb;
 	if (sb && (sb->s_type == &gfs2_fs_type))
 		atomic_inc(&sb->s_active);
 	else
 		sb = NULL;
-	path_put(&nd.path);
+	path_put(&path);
 	return sb;
 }
 

security/tomoyo/common.c

@@ -1720,14 +1720,14 @@ static bool tomoyo_policy_loader_exists(void)
 	 * policies are not loaded yet.
 	 * Thus, let do_execve() call this function everytime.
 	 */
-	struct nameidata nd;
+	struct path path;
 
-	if (path_lookup(tomoyo_loader, LOOKUP_FOLLOW, &nd)) {
+	if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
 		printk(KERN_INFO "Not activating Mandatory Access Control now "
 		       "since %s doesn't exist.\n", tomoyo_loader);
 		return false;
 	}
-	path_put(&nd.path);
+	path_put(&path);
 	return true;
 }
 

security/tomoyo/realpath.c

@@ -165,11 +165,11 @@ char *tomoyo_realpath_from_path(struct path *path)
  */
 char *tomoyo_realpath(const char *pathname)
 {
-	struct nameidata nd;
+	struct path path;
 
-	if (pathname && path_lookup(pathname, LOOKUP_FOLLOW, &nd) == 0) {
-		char *buf = tomoyo_realpath_from_path(&nd.path);
-		path_put(&nd.path);
+	if (pathname && kern_path(pathname, LOOKUP_FOLLOW, &path) == 0) {
+		char *buf = tomoyo_realpath_from_path(&path);
+		path_put(&path);
 		return buf;
 	}
 	return NULL;
@@ -184,11 +184,11 @@ char *tomoyo_realpath(const char *pathname)
  */
 char *tomoyo_realpath_nofollow(const char *pathname)
 {
-	struct nameidata nd;
+	struct path path;
 
-	if (pathname && path_lookup(pathname, 0, &nd) == 0) {
-		char *buf = tomoyo_realpath_from_path(&nd.path);
-		path_put(&nd.path);
+	if (pathname && kern_path(pathname, 0, &path) == 0) {
+		char *buf = tomoyo_realpath_from_path(&path);
+		path_put(&path);
 		return buf;
 	}
 	return NULL;