This is a note to let you know that I've just added the patch titled block: return -EBUSY when there are open partitions in blkdev_reread_part to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: block-return-ebusy-when-there-are-open-partitions-in.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 4f7eb1151883b50e358339016b0410ddb1f315b1 Author: Christoph Hellwig <hch@xxxxxx> Date: Wed Apr 21 18:05:02 2021 +0200 block: return -EBUSY when there are open partitions in blkdev_reread_part [ 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@xxxxxxxxxx> Signed-off-by: Christoph Hellwig <hch@xxxxxx> Link: https://lore.kernel.org/r/20210421160502.447418-1-hch@xxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/block/ioctl.c b/block/ioctl.c index 3be4d0e2a96c..ed240e170e14 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -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