From: John Garry <[email protected]> Add mpath_bdev_ioctl() as a multipath block device IOCTL handler. This handler calls into the mpath_device bdev fops handler.
The .compat_ioctl handler is given the standard handler. Signed-off-by: John Garry <[email protected]> --- lib/multipath.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/lib/multipath.c b/lib/multipath.c index c78d46a446cf3..af90cf38a79d6 100644 --- a/lib/multipath.c +++ b/lib/multipath.c @@ -454,11 +454,47 @@ static void mpath_bdev_release(struct gendisk *disk) mpath_put_head(mpath_head); } +static int mpath_bdev_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long arg) +{ + struct gendisk *disk = bdev->bd_disk; + struct mpath_head *mpath_head = mpath_gendisk_to_head(disk); + struct mpath_device *mpath_device; + int srcu_idx, err; + + if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO)) + return -ENOIOCTLCMD; + + srcu_idx = srcu_read_lock(&mpath_head->srcu); + mpath_device = mpath_find_path(mpath_head); + if (!mpath_device) { + err = -EWOULDBLOCK; + goto out_unlock; + } + + if (!mpath_device->disk->fops->ioctl) { + err = -EOPNOTSUPP; + goto out_unlock; + } + + err = mpath_device->disk->fops->ioctl( + mpath_device->disk->part0, mode, cmd, arg); +out_unlock: + srcu_read_unlock(&mpath_head->srcu, srcu_idx); + return err; +} + const struct block_device_operations mpath_ops = { .owner = THIS_MODULE, .open = mpath_bdev_open, .release = mpath_bdev_release, .submit_bio = mpath_bdev_submit_bio, + .ioctl = mpath_bdev_ioctl, + /* + * Both NVMe and SCSI use generic blkdev_compat_ptr_ioctl, so would + * avoid their custom compat_ioctl implementation. + */ + .compat_ioctl = blkdev_compat_ptr_ioctl, }; EXPORT_SYMBOL_GPL(mpath_ops); -- 2.43.7
