[2/9] md: implement ->free_disk

Commit Message

Christoph Hellwig July 13, 2022, 11:31 a.m. UTC

Ensure that all private data is only freed once all accesses are done.

Signed-off-by: Christoph Hellwig <[e-mail]>
---
 drivers/md/md.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

Patch

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 7affddade8b6b..2beaadd202c4e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5603,11 +5603,6 @@  static void md_free(struct kobject *ko)
 		del_gendisk(mddev->gendisk);
 		blk_cleanup_disk(mddev->gendisk);
 	}
-	percpu_ref_exit(&mddev->writes_pending);
-
-	bioset_exit(&mddev->bio_set);
-	bioset_exit(&mddev->sync_set);
-	kfree(mddev);
 }
 
 static const struct sysfs_ops md_sysfs_ops = {
@@ -7877,6 +7872,17 @@  static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
 	return ret;
 }
 
+static void md_free_disk(struct gendisk *disk)
+{
+	struct mddev *mddev = disk->private_data;
+
+	percpu_ref_exit(&mddev->writes_pending);
+	bioset_exit(&mddev->bio_set);
+	bioset_exit(&mddev->sync_set);
+
+	kfree(mddev);
+}
+
 const struct block_device_operations md_fops =
 {
 	.owner		= THIS_MODULE,
@@ -7890,6 +7896,7 @@  const struct block_device_operations md_fops =
 	.getgeo		= md_getgeo,
 	.check_events	= md_check_events,
 	.set_read_only	= md_set_read_only,
+	.free_disk	= md_free_disk,
 };
 
 static int md_thread(void *arg)