soc: rockchip: add cpuinfo support

[firefly-linux-kernel-4.4.55.git] / drivers / md / dm-ioctl.c

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 80a43954325966a872cf8ebc95fb23c92c0b8819..bc5e9a5b1f302b45c96fb6e874f04022ed9031b2 100644 (file)
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1923,6 +1923,45 @@ void dm_interface_exit(void)
        dm_hash_exit();
 }
 
+
+/**
+ * dm_ioctl_export - Permanently export a mapped device via the ioctl interface
+ * @md: Pointer to mapped_device
+ * @name: Buffer (size DM_NAME_LEN) for name
+ * @uuid: Buffer (size DM_UUID_LEN) for uuid or NULL if not desired
+ */
+int dm_ioctl_export(struct mapped_device *md, const char *name,
+                   const char *uuid)
+{
+       int r = 0;
+       struct hash_cell *hc;
+
+       if (!md) {
+               r = -ENXIO;
+               goto out;
+       }
+
+       /* The name and uuid can only be set once. */
+       mutex_lock(&dm_hash_cells_mutex);
+       hc = dm_get_mdptr(md);
+       mutex_unlock(&dm_hash_cells_mutex);
+       if (hc) {
+               DMERR("%s: already exported", dm_device_name(md));
+               r = -ENXIO;
+               goto out;
+       }
+
+       r = dm_hash_insert(name, uuid, md);
+       if (r) {
+               DMERR("%s: could not bind to '%s'", dm_device_name(md), name);
+               goto out;
+       }
+
+       /* Let udev know we've changed. */
+       dm_kobject_uevent(md, KOBJ_CHANGE, dm_get_event_nr(md));
+out:
+       return r;
+}
 /**
  * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers
  * @md: Pointer to mapped_device