[PATCH] block: add partition uuid into uevent as "PARTUUID"

[Konstantin Khlebnikov]

Both most common formats have uuid in addition to partition name:
GPT: standard uuid xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
DOS: 4 byte disk signature and 1 byte partition xxxxxxxx-xx

Tools from util-linux use the same notation for them.

Signed-off-by: Konstantin Khlebnikov <khlebni...@yandex-team.ru>
---
 block/partition-generic.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/partition-generic.c b/block/partition-generic.c
index 88c555db4e5d..8f8b580aee16 100644
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -226,6 +226,8 @@ static int part_uevent(struct device *dev, struct 
kobj_uevent_env *env)
        add_uevent_var(env, "PARTN=%u", part->partno);
        if (part->info && part->info->volname[0])
                add_uevent_var(env, "PARTNAME=%s", part->info->volname);
+       if (part->info && part->info->uuid[0])
+               add_uevent_var(env, "PARTUUID=%s", part->info->uuid);
        return 0;
 }