From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754958AbcBESBy (ORCPT ); Fri, 5 Feb 2016 13:01:54 -0500 Received: from mail-ob0-f170.google.com ([209.85.214.170]:34150 "EHLO mail-ob0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752116AbcBESBx (ORCPT ); Fri, 5 Feb 2016 13:01:53 -0500 From: John Stultz To: linux-kernel@vger.kernel.org Cc: San Mehat , Jens Axboe , Rom Lemarchand , Android Kernel Team , Jeff Moyer , harald@redhat.com, Kees Cook , Andrew Morton , Kay Sievers , Dima Zavin , John Stultz Subject: [RESEND x2][PATCH v2] block: partition: Add partition specific uevent callbacks for partition info Date: Fri, 5 Feb 2016 10:01:43 -0800 Message-Id: <1454695303-3181-1-git-send-email-john.stultz@linaro.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: San Mehat This patch has been carried in the Android tree for quite some time and is one of the few patches required to get a mainline kernel up and running with an exsiting Android userspace. So I wanted to submit it for review and consideration if it should be merged. For partitions, add new uevent parameters 'PARTN' which specifies the partitions index in the table, and 'PARTNAME', which specifies PARTNAME specifices the partition name of a partition device. Android's userspace uses this for creating device node links from the partition name and number: ie: /dev/block/platform/soc/by-name/system or /dev/block/platform/soc/by-num/p1 One can see its usage here: https://android.googlesource.com/platform/system/core/+/master/init/devices.cpp#355 and https://android.googlesource.com/platform/system/core/+/master/init/devices.cpp#494 Cc: Jens Axboe Cc: Rom Lemarchand Cc: Android Kernel Team Cc: Jeff Moyer Cc: harald@redhat.com Cc: Kees Cook Cc: Andrew Morton Cc: Kay Sievers Signed-off-by: Dima Zavin [Dropped NPARTS and reworded commit message for context] Signed-off-by: John Stultz --- v2: Dropped NPARTS thanks to Jeff noticing it wasn't used block/partition-generic.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/block/partition-generic.c b/block/partition-generic.c index 746935a..ae95e96 100644 --- a/block/partition-generic.c +++ b/block/partition-generic.c @@ -216,10 +216,21 @@ static void part_release(struct device *dev) kfree(p); } +static int part_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct hd_struct *part = dev_to_part(dev); + + add_uevent_var(env, "PARTN=%u", part->partno); + if (part->info && part->info->volname[0]) + add_uevent_var(env, "PARTNAME=%s", part->info->volname); + return 0; +} + struct device_type part_type = { .name = "partition", .groups = part_attr_groups, .release = part_release, + .uevent = part_uevent, }; static void delete_partition_rcu_cb(struct rcu_head *head) -- 1.9.1