From 0d9c51a6e1df4651379b8fca8a7a96595cd9988a Mon Sep 17 00:00:00 2001 From: San Mehat Date: Tue, 15 Mar 2016 14:53:26 -0700 Subject: block: partition: add partition specific uevent callbacks for partition info 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 [john.stultz@linaro.org: dropped NPARTS and reworded commit message for context] Signed-off-by: Dima Zavin Signed-off-by: John Stultz Cc: Jens Axboe Cc: Rom Lemarchand Cc: Android Kernel Team Cc: Jeff Moyer Cc: Cc: Kees Cook Cc: Kay Sievers Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- block/partition-generic.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'block') diff --git a/block/partition-generic.c b/block/partition-generic.c index fefd01b..5d87019 100644 --- a/block/partition-generic.c +++ b/block/partition-generic.c @@ -217,10 +217,21 @@ 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) -- cgit v1.1