Date: Tue, 28 Sep 2010 08:48:53 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: "freebsd-arch@FreeBSD.org Arch" <freebsd-arch@freebsd.org> Subject: Re: [patch] functional prototype of root mount enhancement Message-ID: <DE680426-01D0-4CB6-B1CB-3B3789C99068@mac.com> In-Reply-To: <CD1BDE8F-29BE-4A82-B0D9-8849FF3C1A1F@mac.com> References: <CD1BDE8F-29BE-4A82-B0D9-8849FF3C1A1F@mac.com>
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On Sep 27, 2010, at 11:22 PM, Marcel Moolenaar wrote:
>
> The code has some debug output still, which is helpful to
> see what's going on internally. From a boot (with a
> /.mount.conf present on ufs:/dev/ad0s1a):
A more interesting example is using an ISO image as root that
lives on UFS file system (in this case FreeBSD 8.1 livefs):
:
Root mount waiting for: usbus1
ugen1.2: <Apple Inc.> at usbus1
========
.onfail panic
.timeout 1
ufs:/dev/ad0s1a rw
.ask
========
Trying to mount root from ufs:/dev/ad0s1a [rw]...
XXX: vfs_mountroot_parse: error = 0, mpdevfs=0xc3fa4000, mp=0xc3fa3c94
========
.onfail continue
.md /livefs.iso
#ufs:/dev/da0a
.ask
========
md0 attached to /livefs.iso
Loader variables:
vfs.root.mountfrom=ufs:/dev/ad0s1a
vfs.root.mountfrom.options=rw
Manual root filesystem specification:
<fstype>:<device> [options]
Mount <device> using filesystem <fstype>
and with the specified (optional) option list.
eg. ufs:/dev/da0s1a
cd9660:/dev/acd0 ro
(which is equivalent to: mount -t cd9660 -o ro /dev/acd0 /)
? List valid disk boot devices
<empty line> Abort manual input
mountroot> ?
List of GEOM managed disk devices:
da0p2 da0p1 da0 acd0 ad0s1a ad0s1 ad0
mountroot> .
mountroot> ?
List of GEOM managed disk devices:
md0 da0p2 da0p1 da0 acd0 ad0s1a ad0s1 ad0
mountroot> cd9660:/dev/md#
Trying to mount root from cd9660:/dev/md0 []...
XXX: vfs_mountroot_parse: error = 0, mpdevfs=0xc3fa4000, mp=0xc3fa3a10
lock order reversal:
1st 0xc3e95270 isofs (isofs) @ /usr/src/sys/fs/cd9660/cd9660_vfsops.c:694
2nd 0xc3e959c4 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2221
KDB: stack backtrace:
:
# mount
/dev/md0 on / (cd9660, local, read-only)
/dev/ad0s1a on /mnt (ufs, local, read-only)
devfs on /dev (devfs, local)
/dev/md1 on /var (ufs, local)
/dev/md2 on /tmp (ufs, local)
(md1 & md2 are created by /etc/rc)
--
Marcel Moolenaar
xcllnt@mac.com
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