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block: fix busy device checking in blk_drop_partitions

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bd_super is only set by get_tree_bdev and mount_bdev, and thus not by
other openers like btrfs or the XFS realtime and log devices, as well as
block devices directly opened from user space.  Check bd_openers
instead.

Fixes: 77032ca66f ("Return EBUSY from BLKRRPART for mounted whole-dev fs")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-04-04 08:51:20 +02:00 committed by Jens Axboe
parent 536167d47a
commit d3ef553627
1 changed files with 1 additions and 1 deletions
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2
block/partitions/core.c
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@ -496,7 +496,7 @@ int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev)
if (!disk_part_scan_enabled(disk))
return 0;
if (bdev->bd_part_count || bdev->bd_super)
if (bdev->bd_part_count || bdev->bd_openers)
return -EBUSY;
res = invalidate_partition(disk, 0);
if (res)