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Commit 8ce7ad7b authored by Kristen Carlson Accardi's avatar Kristen Carlson Accardi Committed by Linus Torvalds
Browse files

genhd: send async notification on media change 



Send an uevent to user space to indicate that a media change event has
occurred.

Signed-off-by: default avatarKristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 86ce18d7

block/genhd.c

+23 −0
Original line number Diff line number Diff line
@@ -696,6 +696,27 @@ struct seq_operations diskstats_op = { 
	.show	= diskstats_show

};



static void media_change_notify_thread(struct work_struct *work)

{

	struct gendisk *gd = container_of(work, struct gendisk, async_notify);

	char event[] = "MEDIA_CHANGE=1";

	char *envp[] = { event, NULL };



	/*

	 * set enviroment vars to indicate which event this is for

	 * so that user space will know to go check the media status.

	 */

	kobject_uevent_env(&gd->kobj, KOBJ_CHANGE, envp);

	put_device(gd->driverfs_dev);

}



void genhd_media_change_notify(struct gendisk *disk)

{

	get_device(disk->driverfs_dev);

	schedule_work(&disk->async_notify);

}

EXPORT_SYMBOL_GPL(genhd_media_change_notify);



struct gendisk *alloc_disk(int minors)

{

	return alloc_disk_node(minors, -1);
@@ -725,6 +746,8 @@ struct gendisk *alloc_disk_node(int minors, int node_id) 
		kobj_set_kset_s(disk,block_subsys);

		kobject_init(&disk->kobj);

		rand_initialize_disk(disk);

		INIT_WORK(&disk->async_notify,

			media_change_notify_thread);

	}

	return disk;

}

include/linux/genhd.h

+3 −1
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ struct partition { 
#include <linux/smp.h>

#include <linux/string.h>

#include <linux/fs.h>

#include <linux/workqueue.h>



struct partition {

	unsigned char boot_ind;		/* 0x80 - active */
@@ -139,6 +140,7 @@ struct gendisk { 
#else

	struct disk_stats dkstats;

#endif

	struct work_struct async_notify;

};



/* Structure for sysfs attributes on block devices */
@@ -420,7 +422,7 @@ extern struct gendisk *alloc_disk_node(int minors, int node_id); 
extern struct gendisk *alloc_disk(int minors);

extern struct kobject *get_disk(struct gendisk *disk);

extern void put_disk(struct gendisk *disk);



extern void genhd_media_change_notify(struct gendisk *disk);

extern void blk_register_region(dev_t dev, unsigned long range,

			struct module *module,

			struct kobject *(*probe)(dev_t, int *, void *),