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 | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/lib/multipath.c b/lib/multipath.c index 58eb9be5bebbe..f1758d1e60a60 100644 --- a/lib/multipath.c +++ b/lib/multipath.c @@ -454,11 +454,53 @@ 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; + + /* + * This check is duplicated from sd_ioctl() as we don't pass the + * partition bdev to fops->ioctl. That is not yet possible as the + * per-path disk is hidden and, as such, does not have partitions + * scanned. + */ + 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 = -ENOTTY; + 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
