From: Gulam Mohamed gulam.mohamed@oracle.com
[ Upstream commit bc6a385132601c29a6da1dbf8148c0d3c9ad36dc ]
When BLKRRPART is called concurrently with del_gendisk, the partitions rescan can create a stale partition that will never be be cleaned up.
Fix this by checking the the disk is up before rescanning partitions while under bd_mutex.
Signed-off-by: Gulam Mohamed gulam.mohamed@oracle.com [hch: split from a larger patch] Signed-off-by: Christoph Hellwig hch@lst.de Reviewed-by: Ming Lei ming.lei@redhat.com Link: https://lore.kernel.org/r/20210514131842.1600568-3-hch@lst.de Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- fs/block_dev.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/block_dev.c b/fs/block_dev.c index a5a6a7930e5e..389609bc5aa3 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1244,6 +1244,9 @@ int bdev_disk_changed(struct block_device *bdev, bool invalidate)
lockdep_assert_held(&bdev->bd_mutex);
+ if (!(disk->flags & GENHD_FL_UP)) + return -ENXIO; + rescan: ret = blk_drop_partitions(bdev); if (ret)