From: Kristen Carlson Accardi <kristen.c.accardi@xxxxxxxxx>
Send an uevent to user space to indicate that a media change event has
occurred.
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
block/genhd.c | 23 +++++++++++++++++++++++
include/linux/genhd.h | 4 +++-
2 files changed, 26 insertions(+), 1 deletion(-)
diff -puN block/genhd.c~genhd-send-async-notification-on-media-change block/genhd.c
--- a/block/genhd.c~genhd-send-async-notification-on-media-change
+++ a/block/genhd.c
@@ -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 mino
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;
}
diff -puN include/linux/genhd.h~genhd-send-async-notification-on-media-change include/linux/genhd.h
--- a/include/linux/genhd.h~genhd-send-async-notification-on-media-change
+++ a/include/linux/genhd.h
@@ -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(i
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 *),
_
-
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