- * Return: 0 On success, -errno on error
- */
-static int safe_parse_mount_options(void *data, struct pts_mount_opts *opts)
-{
- int rc;
- void *datacp;
-
- if (!data)
- return 0;
-
- /* Use kstrdup() ? */
- datacp = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!datacp)
- return -ENOMEM;
-
- memcpy(datacp, data, PAGE_SIZE);
- rc = parse_mount_options((char *)datacp, PARSE_MOUNT, opts);
- kfree(datacp);
-
- return rc;
-}
-
-/*
- * Mount a new (private) instance of devpts. PTYs created in this
- * instance are independent of the PTYs in other devpts instances.
- */
-static int new_pts_mount(struct file_system_type *fs_type, int flags,
- void *data, struct vfsmount *mnt)
-{
- int err;
- struct pts_fs_info *fsi;
- struct pts_mount_opts *opts;
-
- printk(KERN_NOTICE "devpts: newinstance mount\n");
-
- err = get_sb_nodev(fs_type, flags, data, devpts_fill_super, mnt);
- if (err)
- return err;
-
- fsi = DEVPTS_SB(mnt->mnt_sb);
- opts = &fsi->mount_opts;
-
- err = parse_mount_options(data, PARSE_MOUNT, opts);
- if (err)
- goto fail;
-
- err = mknod_ptmx(mnt->mnt_sb);
- if (err)
- goto fail;
-
- return 0;
-
-fail:
- dput(mnt->mnt_sb->s_root);
- deactivate_super(mnt->mnt_sb);
- return err;
-}
-
-/*
- * Check if 'newinstance' mount option was specified in @data.
+ * The 'newinstance' option is needed to support multiple namespace
+ * semantics in devpts while preserving backward compatibility of the
+ * current 'single-namespace' semantics. i.e all mounts of devpts
+ * without the 'newinstance' mount option should bind to the initial
+ * kernel mount, like get_sb_single().