[PATCH 5.6 40/73] block: remove the bd_openers checks in blk_drop_partitions

From: Greg Kroah-Hartman
Date: Mon May 04 2020 - 14:07:57 EST


From: Christoph Hellwig <hch@xxxxxx>

commit 10c70d95c0f2f9a6f52d0e33243d2877370cef51 upstream.

When replacing the bd_super check with a bd_openers I followed a logical
conclusion, which turns out to be utterly wrong. When a block device has
bd_super sets it has a mount file system on it (although not every
mounted file system sets bd_super), but that also implies it doesn't even
have partitions to start with.

So instead of trying to come up with a logical check for all openers,
just remove the check entirely.

Fixes: d3ef5536274f ("block: fix busy device checking in blk_drop_partitions")
Fixes: cb6b771b05c3 ("block: fix busy device checking in blk_drop_partitions again")
Reported-by: Michal Koutnà <mkoutny@xxxxxxxx>
Reported-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
block/partition-generic.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -468,7 +468,7 @@ int blk_drop_partitions(struct gendisk *

if (!disk_part_scan_enabled(disk))
return 0;
- if (bdev->bd_part_count || bdev->bd_openers > 1)
+ if (bdev->bd_part_count)
return -EBUSY;
res = invalidate_partition(disk, 0);
if (res)