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authorKristen Carlson Accardi <kristen.c.accardi@intel.com>2007-05-23 13:57:38 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-23 20:14:12 -0700
commit8ce7ad7b2d11fae2c3d285a6a0caea9322c0b8fc (patch)
tree87d7423635821dae9f26d14c62f3314ec7bb3b17
parent86ce18d7b7925bfd6b64c061828ca2a857ee83b8 (diff)
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: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--block/genhd.c23
-rw-r--r--include/linux/genhd.h4
2 files changed, 26 insertions, 1 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 7efa8bb25da..863a8c0623e 100644
--- a/block/genhd.c
+++ b/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 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;
}
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 3fcfed2168a..9756fc102a8 100644
--- a/include/linux/genhd.h
+++ b/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(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 *),