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

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Date:   Fri, 06 Oct 2017 14:42:16 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     linux-block@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] block: add partition uuid into uevent as "PARTUUID"

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 <khlebnikov@...dex-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;
 }