Commit 0d9c51a6 authored Mar 15, 2016 by San Mehat Committed by Linus Torvalds Mar 15, 2016

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 <dima@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Rom Lemarchand <romlem@google.com>
Cc: Android Kernel Team <kernel-team@android.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: <harald@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kay Sievers <kay@vrfy.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 8d67d3c2

block/partition-generic.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -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)

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