And here's a patch which triggers clearing check on close. It's on
top of the following branch + the previous patch.
git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-2.6-block.git for-linus
With the patch applied, eject triggers MEDIA_CHANGE if the drive had a
media in it.
Thanks.
---
block/genhd.c | 22 ++++++++++++----------
fs/block_dev.c | 17 ++++++++---------
include/linux/genhd.h | 2 +-
3 files changed, 21 insertions(+), 20 deletions(-)
Index: work/block/genhd.c
===================================================================
--- work.orig/block/genhd.c
+++ work/block/genhd.c
@@ -1500,30 +1500,32 @@ void disk_unblock_events(struct gendisk
}
/**
- * 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_msec
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);
Index: work/fs/block_dev.c
===================================================================
--- work.orig/fs/block_dev.c
+++ work/fs/block_dev.c
@@ -1447,6 +1447,8 @@ static int __blkdev_put(struct block_dev
int blkdev_put(struct block_device *bdev, fmode_t mode)
{
+ mutex_lock(&bdev->bd_mutex);
+
if (mode & FMODE_EXCL) {
bool bdev_free;
@@ -1455,7 +1457,6 @@ int blkdev_put(struct block_device *bdev
* are protected with bdev_lock. bd_mutex is to
* synchronize disk_holder unlinking.
*/
- mutex_lock(&bdev->bd_mutex);
spin_lock(&bdev_lock);
WARN_ON_ONCE(--bdev->bd_holders < 0);
@@ -1473,17 +1474,15 @@ int blkdev_put(struct block_device *bdev
* If this was the last claim, remove holder link and
* unblock evpoll if it was a write holder.
*/
- if (bdev_free) {
- if (bdev->bd_write_holder) {
- disk_unblock_events(bdev->bd_disk);
- disk_check_events(bdev->bd_disk);
- bdev->bd_write_holder = false;
- }
+ if (bdev_free && bdev->bd_write_holder) {
+ disk_unblock_events(bdev->bd_disk);
+ bdev->bd_write_holder = false;
}
-
- mutex_unlock(&bdev->bd_mutex);
}
+ disk_flush_events(bdev->bd_disk, DISK_EVENT_MEDIA_CHANGE);
+ mutex_unlock(&bdev->bd_mutex);
+
return __blkdev_put(bdev, mode, 0);
}
EXPORT_SYMBOL(blkdev_put);
Index: work/include/linux/genhd.h
===================================================================
--- work.orig/include/linux/genhd.h
+++ work/include/linux/genhd.h
@@ -420,7 +420,7 @@ static inline int get_disk_ro(struct gen
extern void disk_block_events(struct gendisk *disk);
extern void disk_unblock_events(struct gendisk *disk);
-extern void disk_check_events(struct gendisk *disk);
+extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
/* drivers/char/random.c */
--
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