Re-implement the root mount logic using a recursive approach, whereby each

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root file system (starting with devfs and a synthesized configuration) can
contain directives for mounting another file system as root. The old root
file system is re-mounted under the new root file system (with /.mount or
/mnt as the mount point) to allow access to the underlying file system.

The configuration allows for creating vnode-backed memory disks that can
subsequently be mounted as root. This allows for an efficient and low-
cost way to distribute and boot FreeBSD software images that reside on
some storage media.

When trying a mount, the kernel will wait for the device in question to
arrive. The timeout is configurable and is part of the configuration.
This allows arbitrarily complex GEOM configurations to be constructed
on the fly.

A side-effect of this change is that all root specifications, whether
compiled into the kernel or typed at the prompt can contain root mount
options.

...

This commit is contained in:

Marcel Moolenaar 2010-10-18 05:01:53 +00:00

parent c1f0aabb9f

commit e25daafbb6

1 changed files with 751 additions and 339 deletions

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sys/kern/vfs_mountroot.c

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