dm: add name and uuid env values

This patch obtains DM_NAME and DM_UUID from the dm hash cell
structure.

Signed-off-by: Mike Anderson <andmikeus.ibm.com>
---

 drivers/md/dm-ioctl.c         |   33
+++++++++++++++++++++++++++++++++
 drivers/md/dm-uevent.c        |   12 ++++++++++++
 include/linux/device-mapper.h |    1 +
 3 files changed, 46 insertions(+)

Index: b/drivers/md/dm-ioctl.c
============================================================
=======
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
 -15,6
+15,7 
 #include <linux/slab.h>
 #include <linux/dm-ioctl.h>
 #include <linux/hdreg.h>
+#include <linux/kobject.h>
 
 #include <asm/uaccess.h>
 
 -1515,3
+1516,35  void dm_interface_exit(void)
 
 	dm_hash_exit();
 }
+
+int dm_ue_uuid_name_get(struct kobj_uevent_env *env, struct
mapped_device *md)
+{
+	int r = 0;
+	struct hash_cell *hc;
+
+	if (!md)
+		return -ENXIO;
+
+	dm_get(md);
+	down_write(&_hash_lock);
+	hc = dm_get_mdptr(md);
+	if (!hc || hc->md != md) {
+		r = -ENXIO;
+		goto out;
+	}
+
+	if (add_uevent_var(env, "DM_NAME=%s",
hc->name)) {
+		r = -ENOMEM;
+		goto out;
+	}
+
+	if (add_uevent_var(env, "DM_UUID=%s",
hc->uuid)) {
+		r = -ENOMEM;
+		goto out;
+	}
+
+out:
+	up_write(&_hash_lock);
+	dm_put(md);
+	return r;
+}
Index: b/drivers/md/dm-uevent.c
============================================================
=======
--- a/drivers/md/dm-uevent.c
+++ b/drivers/md/dm-uevent.c
 -128,6
+128,18  void dm_send_uevents(struct list_head *e
 
 	list_for_each_entry_safe(evt, next, events, elist) {
 		list_del_init(&evt->elist);
+
+		/*
+		 * Need to get the uuid here for now. Context of
previous
+		 * var adds and locking used for hash_cell not
compatable.
+		 */
+		if (dm_ue_uuid_name_get(&evt->ku_env, evt->md))
{
+			DMERR("%s: dm_ue_uuid_name_get() failed",
+			      __FUNCTION__);
+			dm_uevent_free(evt);
+			continue;
+		}
+
 		r = kobject_uevent_env(kobj, evt->action,
evt->ku_env.envp);
 		if (r)
 			DMERR("%s: kobject_uevent_env failed",
__FUNCTION__);
Index: b/include/linux/device-mapper.h
============================================================
=======
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
 -185,6
+185,7  uint32_t dm_get_event_nr(struct mapped_d
 int dm_wait_event(struct mapped_device *md, int event_nr);
 uint32_t dm_next_uevent_seq(struct mapped_device *md);
 void dm_uevent_add(struct mapped_device *md, struct
list_head *elist);
+int dm_ue_uuid_name_get(struct kobj_uevent_env *env, struct
mapped_device *md);
 
 /*
  * Info functions.

-- 

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