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block: take bd_mutex around delete_partitions in del_gendisk 

There is nothing preventing an ioctl from trying do delete partition
concurrenly with del_gendisk, so take open_mutex to serialize against
that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210406062303.811835-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-04-06 08:22:56 +02:00 committed by Jens Axboe
parent d3c4a43d92
commit c76f48eb5c
2 changed files with 6 additions and 0 deletions
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4
block/genhd.c
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@ -680,7 +680,11 @@ void del_gendisk(struct gendisk *disk)
* disk is marked as dead (GENHD_FL_UP cleared).
*/
down_write(&bdev_lookup_sem);
mutex_lock(&disk->part0->bd_mutex);
blk_drop_partitions(disk);
mutex_unlock(&disk->part0->bd_mutex);
fsync_bdev(disk->part0);
__invalidate_device(disk->part0, true);

2
block/partitions/core.c
View File

@ -531,6 +531,8 @@ void blk_drop_partitions(struct gendisk *disk)
struct disk_part_iter piter;
struct block_device *part;
lockdep_assert_held(&disk->part0->bd_mutex);
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
while ((part = disk_part_iter_next(&piter)))
delete_partition(part);