block: return -EBUSY when there are open partitions in blkdev_reread_…

…part 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: 4601b4b ("block: reopen the device in blkdev_reread_part") Reported-by: Karel Zak <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
mrcsosa · Apr 21, 2021 · 68e6582 · 68e6582
1 parent f06c609
commit 68e6582
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/block/ioctl.c b/block/ioctl.c
@@ -89,6 +89,8 @@ 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