ahci_drv default writeable?

Noticed that in 17.08 (and 17.05) these examples failed w. x86/nova - run/libc_vfs_fs_fat - run/libc_vfs_fat apparently because:

[init -> ahci_drv] read-only session opened at device 0 for 'test-libc_vfs -> 0'

so e.g., mkdir fails with EPERM.

Hacking libports/run/libc_vfs_filesystem_test.inc to add writeable="yes" to the "ahci_drv" component configuration: <config> <policy label_prefix="test-libc_vfs" device="0" writeable="yes"/> <policy label_prefix="vfs" device="0" writeable="yes" /> </config> suffices, but maybe this is not appropriate. Was the default policy intended to be writeable="yes" for this driver?

// Steve Harp