block: flush MEDIA_CHANGE from drivers on close(2)

Currently, only open(2) is defined as the 'clearing' point.  It has
two roles - first, it's an acknowledgement from userland indicating
that the event has been received and kernel can clear pending states
and proceed to generate more events.  Secondly, it's passed on to
device drivers as a hint indicating that a synchronization point has
been reached and it might want to take a deeper look at the device.

The latter currently is only used by sr which uses two different
mechanisms - GET_EVENT_MEDIA_STATUS_NOTIFICATION and TEST_UNIT_READY
to discover events, where the former is lighter weight and safe to be
used repeatedly but may not provide full coverage.  Among other
things, GET_EVENT can't detect media removal while TUR can.

This patch makes close(2) - blkdev_put() - indicate clearing hint for
MEDIA_CHANGE to drivers.  disk_check_events() is renamed to
disk_flush_events() and updated to take @mask for events to flush
which is or'd to ev->clearing and will be passed to the driver on the
next ->check_events() invocation.

This change makes sr generate MEDIA_CHANGE when media is ejected from
userland - e.g. with eject(1).

Note: Given the current usage, it seems @clearing hint is needlessly
complex.  disk_clear_events() can simply clear all events and the hint
can be boolean @flush.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 12 insertions, 10 deletions

diff --git a/block/genhd.c b/block/genhd.c
index 82d97c3594a8..fbd7605a5865 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1500,30 +1500,32 @@ void disk_unblock_events(struct gendisk *disk)
 }
 
 /**
- * disk_check_events - schedule immediate event checking
- * @disk: disk to check events for
+ * disk_flush_events - schedule immediate event checking and flushing
+ * @disk: disk to check and flush events for
+ * @mask: events to flush
  *
- * Schedule immediate event checking on @disk if not blocked.
+ * Schedule immediate event checking on @disk if not blocked.  Events in
+ * @mask are scheduled to be cleared from the driver.  Note that this
+ * doesn't clear the events from @disk->ev.
  *
  * CONTEXT:
- * Don't care.  Safe to call from irq context.
+ * If @mask is non-zero must be called with bdev->bd_mutex held.
  */
-void disk_check_events(struct gendisk *disk)
+void disk_flush_events(struct gendisk *disk, unsigned int mask)
 {
         struct disk_events *ev = disk->ev;
-        unsigned long flags;
 
         if (!ev)
                 return;
 
-        spin_lock_irqsave(&ev->lock, flags);
+        spin_lock_irq(&ev->lock);
+        ev->clearing |= mask;
         if (!ev->block) {
                 cancel_delayed_work(&ev->dwork);
                 queue_delayed_work(system_nrt_wq, &ev->dwork, 0);
         }
-        spin_unlock_irqrestore(&ev->lock, flags);
+        spin_unlock_irq(&ev->lock);
 }
-EXPORT_SYMBOL_GPL(disk_check_events);
 
 /**
  * disk_clear_events - synchronously check, clear and return pending events
@@ -1713,7 +1715,7 @@ static int disk_events_set_dfl_poll_msecs(const char *val,
         mutex_lock(&disk_events_mutex);
 
         list_for_each_entry(ev, &disk_events, node)
-                disk_check_events(ev->disk);
+                disk_flush_events(ev->disk, 0);
 
         mutex_unlock(&disk_events_mutex);