ian 783b0eb845 Add a new kernel config option, MD_ROOT_READONLY, which forces on the ... MD_READONLY flag for the md device automatically instantiated during kernel init for an mdroot filesystem. Note that there is specifically and by design no tunable or sysctl control over this feature. Without this option, you already have control over whether the mdroot fs is writeable using vfs.root.mountfrom.options from loader(8), the root_rw_mount rcvar, and by using "mount -u[rw] /" or equivelent on the fly. This option is being added to provide a way to make the mdroot fs truly immutable before userland code begins running. Differential Revision: https://reviews.freebsd.org/D13411		2017-12-20 18:23:22 +00:00
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md.c	Add a new kernel config option, MD_ROOT_READONLY, which forces on the	2017-12-20 18:23:22 +00:00