genhd: send async notification on media change (8ce7ad7b) · Commits · 戴 / test

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;
		}

+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 ),