Commit e00adcad authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

block: add a new set_read_only method 



Add a new method to allow for driver-specific processing when setting or
clearing the block device read-only state.  This allows to replace the
cumbersome and error-prone override of the whole ioctl implementation.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 4a9d6d66

block/ioctl.c

+5 −0
Original line number Diff line number Diff line
@@ -389,6 +389,11 @@ static int blkdev_roset(struct block_device *bdev, fmode_t mode, 
		return ret;

	if (get_user(n, (int __user *)arg))

		return -EFAULT;

	if (bdev->bd_disk->fops->set_read_only) {

		ret = bdev->bd_disk->fops->set_read_only(bdev, n);

		if (ret)

			return ret;

	}

	set_device_ro(bdev, n);

	return 0;

}

include/linux/blkdev.h

+1 −0
Original line number Diff line number Diff line
@@ -1850,6 +1850,7 @@ struct block_device_operations { 
	void (*unlock_native_capacity) (struct gendisk *);

	int (*revalidate_disk) (struct gendisk *);

	int (*getgeo)(struct block_device *, struct hd_geometry *);

	int (*set_read_only)(struct block_device *bdev, bool ro);

	/* this callback is with swap_lock and sometimes page table lock held */

	void (*swap_slot_free_notify) (struct block_device *, unsigned long);

	int (*report_zones)(struct gendisk *, sector_t sector,