bcache: Send a uevent with a cached device's UUID
Signed-off-by: Gabriel de Perthuis <g2p.code@gmail.com>
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 8c73f0c..a104dad 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -825,6 +825,11 @@
void bch_cached_dev_run(struct cached_dev *dc)
{
struct bcache_device *d = &dc->disk;
+ char *env[] = {
+ "DRIVER=bcache",
+ kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
+ NULL
+ };
if (atomic_xchg(&dc->running, 1))
return;
@@ -841,10 +846,11 @@
add_disk(d->disk);
bd_link_disk_holder(dc->bdev, dc->disk.disk);
-#if 0
- char *env[] = { "SYMLINK=label" , NULL };
+ /* won't show up in the uevent file, use udevadm monitor -e instead
+ * only class / kset properties are persistent */
kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);
-#endif
+ kfree(env[1]);
+
if (sysfs_create_link(&d->kobj, &disk_to_dev(d->disk)->kobj, "dev") ||
sysfs_create_link(&disk_to_dev(d->disk)->kobj, &d->kobj, "bcache"))
pr_debug("error creating sysfs link");