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Commit dc717408 authored by Jan Kara's avatar Jan Kara Committed by Greg Kroah-Hartman
Browse files

loop: Push loop_ctl_mutex down to loop_change_fd() 



commit c371077000f4138ee3c15fbed50101ff24bdc91d upstream.

Push loop_ctl_mutex down to loop_change_fd(). We will need this to be
able to call loop_reread_partitions() without loop_ctl_mutex.

Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9218b108

drivers/block/loop.c

+11 −11
Original line number Diff line number Diff line
@@ -692,19 +692,22 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, 
	struct file	*file, *old_file;

	int		error;



	error = mutex_lock_killable_nested(&loop_ctl_mutex, 1);

	if (error)

		return error;

	error = -ENXIO;

	if (lo->lo_state != Lo_bound)

		goto out;

		goto out_unlock;



	/* the loop device has to be read-only */

	error = -EINVAL;

	if (!(lo->lo_flags & LO_FLAGS_READ_ONLY))

		goto out;

		goto out_unlock;



	error = -EBADF;

	file = fget(arg);

	if (!file)

		goto out;

		goto out_unlock;



	error = loop_validate_file(file, bdev);

	if (error)
@@ -731,11 +734,13 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, 
	fput(old_file);

	if (lo->lo_flags & LO_FLAGS_PARTSCAN)

		loop_reread_partitions(lo, bdev);

	mutex_unlock(&loop_ctl_mutex);

	return 0;



out_putf:

	fput(file);

 out:

out_unlock:

	mutex_unlock(&loop_ctl_mutex);

	return error;

}
@@ -1470,12 +1475,7 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode, 
	case LOOP_SET_FD:

		return loop_set_fd(lo, mode, bdev, arg);

	case LOOP_CHANGE_FD:

		err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);

		if (err)

			return err;

		err = loop_change_fd(lo, bdev, arg);

		mutex_unlock(&loop_ctl_mutex);

		break;

		return loop_change_fd(lo, bdev, arg);

	case LOOP_CLR_FD:

		return loop_clr_fd(lo);

	case LOOP_SET_STATUS: