linux-kernel - [PATCH v2 02/12] genhd: Honor gen_uevent and add disk_gen

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Date:	Thu, 30 Jun 2016 09:59:43 +0800
From:	Fam Zheng <famz@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Jens Axboe <axboe@...nel.dk>,
	"Ed L. Cashin" <ed.cashin@....org>, Jiri Kosina <jikos@...nel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Shaohua Li <shli@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Keith Busch <keith.busch@...el.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-block@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	linux-raid@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-mtd@...ts.infradead.org, linux-nvme@...ts.infradead.org,
	Christoph Hellwig <hch@...radead.org>, famz@...hat.com
Subject: [PATCH v2 02/12] genhd: Honor gen_uevent and add disk_gen_uevents

In add_disk(), don't send uevent to userspace when gen_uevent is true;
also export the refactored function disk_gen_uevents for later use.

Signed-off-by: Fam Zheng <famz@...hat.com>
---
 block/genhd.c         | 23 +++++++++++++++++++----
 include/linux/genhd.h |  1 +
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 8e1bfa1..9b66953 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -506,12 +506,10 @@ static int exact_lock(dev_t devt, void *data)
 	return 0;
 }
 
-static void register_disk(struct gendisk *disk)
+static void register_disk(struct gendisk *disk, bool gen_uevent)
 {
 	struct device *ddev = disk_to_dev(disk);
 	struct block_device *bdev;
-	struct disk_part_iter piter;
-	struct hd_struct *part;
 	int err;
 
 	ddev->parent = disk->driverfs_dev;
@@ -563,6 +561,22 @@ static void register_disk(struct gendisk *disk)
 exit:
 	/* announce disk after possible partitions are created */
 	dev_set_uevent_suppress(ddev, 0);
+	if (gen_uevent)
+		disk_gen_uevents(disk);
+}
+
+/**
+ * disk_gen_uevents
+ * @disk - the disk to generate uevent
+ *
+ * Generate KOBJ_ADD uevents on the disk and partitions.
+ */
+void disk_gen_uevents(struct gendisk *disk)
+{
+	struct device *ddev = disk_to_dev(disk);
+	struct disk_part_iter piter;
+	struct hd_struct *part;
+
 	kobject_uevent(&ddev->kobj, KOBJ_ADD);
 
 	/* announce possible partitions */
@@ -571,6 +585,7 @@ exit:
 		kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
 	disk_part_iter_exit(&piter);
 }
+EXPORT_SYMBOL(disk_gen_uevents);
 
 /**
  * add_disk - add partitioning information to kernel list
@@ -618,7 +633,7 @@ void add_disk(struct gendisk *disk, bool gen_uevent)
 
 	blk_register_region(disk_devt(disk), disk->minors, NULL,
 			    exact_match, exact_lock, disk);
-	register_disk(disk);
+	register_disk(disk, gen_uevent);
 	blk_register_queue(disk);
 
 	/*
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 038be80..87ad9e5 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -416,6 +416,7 @@ extern void part_round_stats(int cpu, struct hd_struct *part);
 /* block/genhd.c */
 extern void add_disk(struct gendisk *disk, bool gen_uevent);
 extern void del_gendisk(struct gendisk *gp);
+extern void disk_gen_uevents(struct gendisk *disk);
 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
 
-- 
2.9.0