170 lines
4.8 KiB
Diff
170 lines
4.8 KiB
Diff
From 4c32a717692fa5a74d10d9710dd5d358890f0d4e Mon Sep 17 00:00:00 2001
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From: Lennert Buytenhek <buytenh@wantstofly.org>
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Date: Sun, 15 Apr 2012 02:40:17 +0200
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Subject: [PATCH] virtfs root filesystem support
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Qemu/KVM provides virtfs, a paravirtualised filesystem that is
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implemented by running the Plan 9 folder sharing protocol over
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virtio.
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Make booting with root=virtfs:foobar use the virtfs filesystem
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with mount tag 'foobar' as root filesystem, to allow booting
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virtual machines off virtfs.
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Note that this only handles 9p over virtio (i.e. virtfs), and
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doesn't attempt to handle mounting 9p filesystems over TCP/IP,
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for example.
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Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
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---
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dracut.spec | 1 +
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modules.d/95virtfs/module-setup.sh | 27 +++++++++++++
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modules.d/95virtfs/mount-virtfs.sh | 75 ++++++++++++++++++++++++++++++++++++
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modules.d/95virtfs/parse-virtfs.sh | 9 +++++
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4 files changed, 112 insertions(+)
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create mode 100755 modules.d/95virtfs/module-setup.sh
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create mode 100755 modules.d/95virtfs/mount-virtfs.sh
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create mode 100755 modules.d/95virtfs/parse-virtfs.sh
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diff --git a/dracut.spec b/dracut.spec
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index 074cb10..9cd08b7 100644
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--- a/dracut.spec
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+++ b/dracut.spec
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@@ -270,6 +270,7 @@ rm -rf $RPM_BUILD_ROOT
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%{dracutlibdir}/modules.d/95zfcp
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%{dracutlibdir}/modules.d/95terminfo
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%{dracutlibdir}/modules.d/95udev-rules
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+%{dracutlibdir}/modules.d/95virtfs
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%{dracutlibdir}/modules.d/96securityfs
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%{dracutlibdir}/modules.d/97biosdevname
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%{dracutlibdir}/modules.d/97masterkey
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diff --git a/modules.d/95virtfs/module-setup.sh b/modules.d/95virtfs/module-setup.sh
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new file mode 100755
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index 0000000..a6081c2
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--- /dev/null
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+++ b/modules.d/95virtfs/module-setup.sh
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@@ -0,0 +1,27 @@
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+#!/bin/bash
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+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
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+# ex: ts=8 sw=4 sts=4 et filetype=sh
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+
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+check() {
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+ [[ $hostonly ]] || [[ $mount_needs ]] && {
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+ for fs in ${host_fs_types[@]}; do
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+ strstr "$fs" "\|9p" && return 0
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+ done
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+ return 1
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+ }
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+
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+ return 0
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+}
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+
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+depends() {
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+ return 0
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+}
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+
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+installkernel() {
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+ instmods 9p 9pnet_virtio
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+}
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+
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+install() {
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+ inst_hook cmdline 95 "$moddir/parse-virtfs.sh"
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+ inst_hook mount 99 "$moddir/mount-virtfs.sh"
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+}
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diff --git a/modules.d/95virtfs/mount-virtfs.sh b/modules.d/95virtfs/mount-virtfs.sh
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new file mode 100755
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index 0000000..dfebf38
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--- /dev/null
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+++ b/modules.d/95virtfs/mount-virtfs.sh
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@@ -0,0 +1,75 @@
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+#!/bin/sh
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+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
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+# ex: ts=8 sw=4 sts=4 et filetype=sh
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+
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+type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
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+
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+filter_rootopts() {
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+ rootopts=$1
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+ # strip ro and rw options
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+ local OLDIFS="$IFS"
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+ IFS=,
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+ set -- $rootopts
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+ IFS="$OLDIFS"
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+ local v
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+ while [ $# -gt 0 ]; do
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+ case $1 in
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+ rw|ro);;
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+ defaults);;
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+ *)
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+ v="$v,${1}";;
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+ esac
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+ shift
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+ done
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+ rootopts=${v#,}
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+ echo $rootopts
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+}
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+
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+mount_root() {
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+ local _ret
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+
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+ rootfs="9p"
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+ rflags="trans=virtio,version=9p2000.L"
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+
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+ modprobe 9pnet_virtio
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+
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+ mount -t ${rootfs} -o "$rflags",ro "${root#virtfs:}" "$NEWROOT"
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+
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+ rootopts=
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+ if getargbool 1 rd.fstab -n rd_NO_FSTAB \
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+ && ! getarg rootflags \
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+ && [ -f "$NEWROOT/etc/fstab" ] \
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+ && ! [ -L "$NEWROOT/etc/fstab" ]; then
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+ # if $NEWROOT/etc/fstab contains special mount options for
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+ # the root filesystem,
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+ # remount it with the proper options
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+ rootopts="defaults"
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+ while read dev mp fs opts rest; do
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+ # skip comments
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+ [ "${dev%%#*}" != "$dev" ] && continue
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+
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+ if [ "$mp" = "/" ]; then
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+ rootopts=$opts
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+ break
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+ fi
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+ done < "$NEWROOT/etc/fstab"
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+
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+ rootopts=$(filter_rootopts $rootopts)
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+ fi
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+
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+ # we want rootflags (rflags) to take precedence so prepend rootopts to
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+ # them; rflags is guaranteed to not be empty
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+ rflags="${rootopts:+"${rootopts},"}${rflags}"
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+
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+ umount "$NEWROOT"
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+
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+ info "Remounting ${root#virtfs:} with -o ${rflags}"
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+ mount -t ${rootfs} -o "$rflags" "${root#virtfs:}" "$NEWROOT" 2>&1 | vinfo
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+
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+ [ -f "$NEWROOT"/forcefsck ] && rm -f "$NEWROOT"/forcefsck 2>/dev/null
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+ [ -f "$NEWROOT"/.autofsck ] && rm -f "$NEWROOT"/.autofsck 2>/dev/null
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+}
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+
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+if [ -n "$root" -a -z "${root%%virtfs:*}" ]; then
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+ mount_root
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+fi
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diff --git a/modules.d/95virtfs/parse-virtfs.sh b/modules.d/95virtfs/parse-virtfs.sh
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new file mode 100755
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index 0000000..ce6de6d
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--- /dev/null
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+++ b/modules.d/95virtfs/parse-virtfs.sh
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@@ -0,0 +1,9 @@
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+#!/bin/sh
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+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
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+# ex: ts=8 sw=4 sts=4 et filetype=sh
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+
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+if [ "${root%%:*}" = "virtfs" ] ; then
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+ modprobe 9pnet_virtio
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+
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+ rootok=1
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+fi
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