On Wed, Jan 17, 2018 at 05:37:39PM +0900, Misono, Tomohiro wrote:
> commit ae3acc5fc0bf ("btrfs: cleanup btrfs_mount() using
> btrfs_mount_root()") introduces a bug that "btrfs device scan/ready" for
> mounted filesystem fails.
>
> This is because fs_info->bdev_holder has been changed to hold
> btrfs_root_fs_type instead of btrfs_fs_type by this commit, but ioctl
> for device scan/ready still uses btrfs_fs_type to call
> btrfs_scan_one_device(). This leads to failiure of blkdev_get_by_path()
> for mounted filesystem because of different holder type.
>
> Fix this by specifying btrfs_root_fs_type for btrfs_scan_one_device() in
> the path of device ready/scan ioctl.
>
> Signed-off-by: Tomohiro Misono <misono.tomohiro@xxxxxxxxxxxxxx>
Thanks. I'd rather fold that in to "btrfs: cleanup btrfs_mount() using
btrfs_mount_root()" where the semantics of holder actually changes.
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