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block: add a mark_dead holder operation

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Add a mark_dead method to blk_holder_ops that is called from blk_mark_disk_dead
to notify the holder that the block device it is using has been marked dead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Christian Brauner <brauner@kernel.org>
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Link: https://lore.kernel.org/r/20230601094459.1350643-11-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-06-01 11:44:53 +02:00 committed by Jens Axboe
parent 0718afd47f
commit f55e017c64
2 changed files with 25 additions and 0 deletions
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24
block/genhd.c
View file

@ -565,6 +565,28 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
}
EXPORT_SYMBOL(device_add_disk);
static void blk_report_disk_dead(struct gendisk *disk)
{
struct block_device *bdev;
unsigned long idx;
rcu_read_lock();
xa_for_each(&disk->part_tbl, idx, bdev) {
if (!kobject_get_unless_zero(&bdev->bd_device.kobj))
continue;
rcu_read_unlock();
mutex_lock(&bdev->bd_holder_lock);
if (bdev->bd_holder_ops && bdev->bd_holder_ops->mark_dead)
bdev->bd_holder_ops->mark_dead(bdev);
mutex_unlock(&bdev->bd_holder_lock);
put_device(&bdev->bd_device);
rcu_read_lock();
}
rcu_read_unlock();
}
/**
* blk_mark_disk_dead - mark a disk as dead
* @disk: disk to mark as dead
@ -592,6 +614,8 @@ void blk_mark_disk_dead(struct gendisk *disk)
* Prevent new I/O from crossing bio_queue_enter().
*/
blk_queue_start_drain(disk->queue);
blk_report_disk_dead(disk);
}
EXPORT_SYMBOL_GPL(blk_mark_disk_dead);

1
include/linux/blkdev.h
View file

@ -1471,6 +1471,7 @@ void blkdev_show(struct seq_file *seqf, off_t offset);
#endif
struct blk_holder_ops {
void (*mark_dead)(struct block_device *bdev);
};
struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder,