block: take bd_mutex around delete_partitions in del_gendisk
There is nothing preventing an ioctl from trying do delete partition
concurrenly with del_gendisk, so take open_mutex to serialize against
that.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210406062303.811835-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/genhd.c b/block/genhd.c
index 8303ec6..e3f3c23 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -680,7 +680,11 @@ void del_gendisk(struct gendisk *disk)
* disk is marked as dead (GENHD_FL_UP cleared).
*/
down_write(&bdev_lookup_sem);
+
+ mutex_lock(&disk->part0->bd_mutex);
blk_drop_partitions(disk);
+ mutex_unlock(&disk->part0->bd_mutex);
+
fsync_bdev(disk->part0);
__invalidate_device(disk->part0, true);