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block: return -EBUSY when there are open partitions in blkdev_reread_part

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[ Upstream commit 68e6582e8f2dc32fd2458b9926564faa1fb4560e ]

The switch to go through blkdev_get_by_dev means we now ignore the
return value from bdev_disk_changed in __blkdev_get.  Add a manual
check to restore the old semantics.

Fixes: 4601b4b130de ("block: reopen the device in blkdev_reread_part")
Reported-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210421160502.447418-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christoph Hellwig 2021-04-21 18:05:02 +02:00 committed by Greg Kroah-Hartman
parent 2bbd8aafde
commit fc2454cc0c
1 changed files with 2 additions and 0 deletions
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2
block/ioctl.c
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@ -98,6 +98,8 @@ static int blkdev_reread_part(struct block_device *bdev, fmode_t mode)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (bdev->bd_part_count)
return -EBUSY;
/*
* Reopen the device to revalidate the driver state and force a