Add mpath_bdev_ioctl() as a multipath block device IOCTL handler. This handler calls into the mpath_device bdev fops handler.
Like what is done for cdev IOCTL handler, use .ioctl_begin and .ioctl_finish methods to know when the until the SRCU read lock - this is for special NVMe controller IOCTL handling. The .compat_ioctl handler is given the standard handler. Signed-off-by: John Garry <[email protected]> --- lib/multipath.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/lib/multipath.c b/lib/multipath.c index c72f35e02e2ab..e2998c1b277c0 100644 --- a/lib/multipath.c +++ b/lib/multipath.c @@ -490,6 +490,38 @@ 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; + void *unlocked_ioctl_data = NULL; + + 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_head->mpdt->ioctl_begin) + mpath_head->mpdt->ioctl_begin(mpath_device, cmd, + &unlocked_ioctl_data); + if (unlocked_ioctl_data) + srcu_read_unlock(&mpath_head->srcu, srcu_idx); + err = mpath_device->disk->fops->ioctl( + mpath_device->disk->part0, mode, cmd, arg); + if (unlocked_ioctl_data) { + mpath_head->mpdt->ioctl_finish(unlocked_ioctl_data); + return err; + } +out_unlock: + srcu_read_unlock(&mpath_head->srcu, srcu_idx); + return err; +} + static int mpath_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, unsigned int flags) { @@ -676,6 +708,8 @@ const struct block_device_operations mpath_ops = { .open = mpath_bdev_open, .release = mpath_bdev_release, .submit_bio = mpath_bdev_submit_bio, + .ioctl = mpath_bdev_ioctl, + .compat_ioctl = blkdev_compat_ptr_ioctl, .report_zones = mpath_bdev_report_zones, .pr_ops = &mpath_pr_ops, }; -- 2.43.5
