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block: fix a race between del_gendisk and BLKRRPART 

[ Upstream commit bc6a385132 ]

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>
pull/363/head^2
Gulam Mohamed 2021-05-14 15:18:42 +02:00 committed by Greg Kroah-Hartman
parent ff945d033a
commit b0f5d4891e
1 changed files with 3 additions and 0 deletions
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3
fs/block_dev.c
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@ -1408,6 +1408,9 @@ 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)