Update for Dracut-010

Update Dracut module for Dracut-010 and fix race conditions that
caused boot to fail on MP systems.  Add support for zfs_force flag
and parsing of spl_hostid from kernel command line.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

dracut/90zfs/90-zfs.rules

@@ -4,4 +4,7 @@ ACTION!="add|change", GOTO="zfs_end"
 ENV{ID_FS_TYPE}=="zfs", RUN+="/sbin/modprobe zfs"
 ENV{ID_FS_TYPE}=="zfs_member", RUN+="/sbin/modprobe zfs"
 
+KERNEL=="null", SYMLINK+="root"
+SYMLINK=="null", SYMLINK+="root"
+
 LABEL="zfs_end"

dracut/90zfs/Makefile.am

@@ -1,11 +1,8 @@
 pkgdracutdir = $(datadir)/dracut/modules.d/90zfs
 dist_pkgdracut_SCRIPTS = \
 	$(top_srcdir)/dracut/90zfs/90-zfs.rules \
-	$(top_srcdir)/dracut/90zfs/check \
+	$(top_srcdir)/dracut/90zfs/module-setup.sh \
-	$(top_srcdir)/dracut/90zfs/install \
-	$(top_srcdir)/dracut/90zfs/installkernel \
 	$(top_srcdir)/dracut/90zfs/mount-zfs.sh \
-	$(top_srcdir)/dracut/90zfs/zfs-genrules.sh \
 	$(top_srcdir)/dracut/90zfs/parse-zfs.sh
 
 all:

dracut/90zfs/Makefile.in

@@ -289,11 +289,8 @@ top_srcdir = @top_srcdir@
 pkgdracutdir = $(datadir)/dracut/modules.d/90zfs
 dist_pkgdracut_SCRIPTS = \
 	$(top_srcdir)/dracut/90zfs/90-zfs.rules \
-	$(top_srcdir)/dracut/90zfs/check \
+	$(top_srcdir)/dracut/90zfs/module-setup.sh \
-	$(top_srcdir)/dracut/90zfs/install \
-	$(top_srcdir)/dracut/90zfs/installkernel \
 	$(top_srcdir)/dracut/90zfs/mount-zfs.sh \
-	$(top_srcdir)/dracut/90zfs/zfs-genrules.sh \
 	$(top_srcdir)/dracut/90zfs/parse-zfs.sh
 
 all: all-am

dracut/90zfs/check

@@ -1,10 +0,0 @@
-#!/bin/bash
-
-# We depend on udev-rules being loaded
-[ "$1" = "-d" ] && exit 0
-
-# Verify the zfs tool chain
-which zpool >/dev/null 2>&1 || exit 1
-which zfs >/dev/null 2>&1 || exit 1
-
-exit 0

dracut/90zfs/install

@@ -1,17 +0,0 @@
-#!/bin/bash
-
-inst_rules "$moddir/90-zfs.rules"
-inst_rules /etc/udev/rules.d/60-zpool.rules
-inst_rules /etc/udev/rules.d/60-zvol.rules
-inst /etc/zfs/zdev.conf
-inst /etc/hostid
-dracut_install zfs
-dracut_install zpool
-dracut_install zpool_layout
-dracut_install zpool_id
-dracut_install zvol_id
-dracut_install mount.zfs
-dracut_install hostid
-inst_hook cmdline 95 "$moddir/parse-zfs.sh"
-inst_hook mount 98 "$moddir/mount-zfs.sh"
-inst_hook pre-udev 29 "$moddir/zfs-genrules.sh"

dracut/90zfs/installkernel

@@ -1,10 +0,0 @@
-#!/bin/bash
-
-instmods zfs
-instmods zcommon
-instmods znvpair
-instmods zavl
-instmods zunicode
-instmods spl
-instmods zlib_deflate
-instmods zlib_inflate

dracut/90zfs/module-setup.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+
+check() {
+  # We depend on udev-rules being loaded
+  [ "$1" = "-d" ] && return 0
+
+  # Verify the zfs tool chain
+  which zpool >/dev/null 2>&1 || return 1
+  which zfs >/dev/null 2>&1 || return 1
+
+  return 0
+}
+
+depends() {
+  echo udev-rules
+  return 0
+}
+
+installkernel() {
+  instmods zfs
+  instmods zcommon
+  instmods znvpair
+  instmods zavl
+  instmods zunicode
+  instmods spl
+  instmods zlib_deflate
+  instmods zlib_inflate
+}
+
+install() {
+  inst_rules "$moddir/90-zfs.rules"
+  inst_rules /etc/udev/rules.d/60-zpool.rules
+  inst_rules /etc/udev/rules.d/60-zvol.rules
+  inst /etc/zfs/zdev.conf
+  inst /etc/zfs/zpool.cache
+  inst /etc/hostid
+  dracut_install zfs
+  dracut_install zpool
+  dracut_install zpool_layout
+  dracut_install zpool_id
+  dracut_install zvol_id
+  dracut_install mount.zfs
+  dracut_install hostid
+  inst_hook cmdline 95 "$moddir/parse-zfs.sh"
+  inst_hook mount 98 "$moddir/mount-zfs.sh"
+}

dracut/90zfs/mount-zfs.sh

@@ -2,15 +2,67 @@
 
 . /lib/dracut-lib.sh
 
-if [ "$rootfs" = "zfs" ]; then
+ZPOOL_FORCE=""
-    zfsrootfs=`echo "$root" | sed 's|^zfs:||'`
+if getargbool 0 zfs_force -y zfs.force -y zfsforce ; then
-    zfspool=`echo "$zfsrootfs" | sed 's|/.*||g'`
+  warn "ZFS: Will force-import pools if necessary."
-    zpool import -N "$zfspool"
+  ZPOOL_FORCE="-f"
-    mount -o zfsutil -t "$rootfs" "$zfsrootfs" "$NEWROOT"
-    if [ "$?" = "0" ]
-    then
-        ROOTFS_MOUNTED=yes
-    else
-        mount -t "$rootfs" "$zfsrootfs" "$NEWROOT" && ROOTFS_MOUNTED=yes
-    fi
 fi
+
+case "$root" in
+  zfs:*)
+    # We have ZFS modules loaded, so we're able to import pools now.
+    if [ "$root" = "zfs:AUTO" ] ; then
+      # Need to parse bootfs attribute
+      info "ZFS: Attempting to detect root from imported ZFS pools."
+
+      # Might be imported by the kernel module, so try searching before
+      # we import anything.
+      zfsbootfs=`zpool list -H -o bootfs | sed 'q'`
+      if [ "$zfsbootfs" = "" ] ; then
+        # Not there, so we need to import everything.
+        info "ZFS: Attempting to import additional pools."
+        zpool import -N -a ${ZPOOL_FORCE}
+        zfsbootfs=`zpool list -H -o bootfs | sed 'q'`
+        if [ "$zfsbootfs" = "" ] ; then
+          rootok=0
+          pool=""
+
+          warn "ZFS: No bootfs attribute found in importable pools."
+
+          # Re-export everything since we're not prepared to take
+          # responsibility for them.
+          zpool list -H | while read fs rest ; do
+            zpool export "$fs"
+          done
+
+          return 1
+        fi
+      fi
+      info "ZFS: Using ${zfsbootfs} as root."
+    else
+      # Should have an explicit pool set, so just import it and we're done.
+      zfsbootfs="${root#zfs:}"
+      pool="${zfsbootfs%%/*}"
+      if ! zpool list -H $pool > /dev/null ; then
+        # pool wasn't imported automatically by the kernel module, so
+        # try it manually.
+        info "ZFS: Importing pool ${pool}..."
+        if ! zpool import -N ${ZPOOL_FORCE} $pool ; then
+          warn "ZFS: Unable to import pool ${pool}."
+          rootok=0
+
+          return 1
+        fi
+      fi
+    fi
+
+    # Above should have left our rpool imported and pool/dataset in $root.
+    # We need zfsutil for non-legacy mounts and not for legacy mounts.
+    mountpoint=`zfs get -H -o value mountpoint $zfsbootfs`
+    if [ "$mountpoint" = "legacy" ] ; then
+      mount -t zfs "$zfsbootfs" "$NEWROOT" && ROOTFS_MOUNTED=yes
+    else
+      mount -o zfsutil -t zfs "$zfsbootfs" "$NEWROOT" && ROOTFS_MOUNTED=yes
+    fi
+    ;;
+esac

dracut/90zfs/parse-zfs.sh

@@ -1,23 +1,49 @@
+#!/bin/sh
+
+. /lib/dracut-lib.sh
+
+# Let the command line override our host id.
+spl_hostid=`getarg spl_hostid=`
+if [ "${spl_hostid}" != "" ] ; then
+  info "ZFS: Using hostid from command line: ${spl_hostid}"
+  echo "${spl_hostid}" > /etc/hostid
+elif [ -f /etc/hostid ] ; then
+  info "ZFS: Using hostid from /etc/hostid: `cat /etc/hostid`"
+else
+  warn "ZFS: No hostid found on kernel command line or /etc/hostid.  ZFS pools may not import correctly."
+fi
+
 case "$root" in
-    zfs:FILESYSTEM=*|FILESYSTEM=*)
+  ""|zfs|zfs:)
-	root="${root#zfs:}"
+    # We'll take root unset, root=zfs, or root=zfs:
-	root="zfs:${root#FILESYSTEM=}"
+    # No root set, so we want to read the bootfs attribute.  We can't do
-        rootfs="zfs"
+    # that until udev settles so we'll set dummy values and hope for the
-        rootok=1 ;;
+    # best later on.
-    zfs:ZFS=*|ZFS=*)
+    root="zfs:AUTO"
-	root="${root#zfs:}"
+    rootok=1
-	root="zfs:${root#ZFS=}"
+
-        rootfs="zfs"
+    info "ZFS: Enabling autodetection of bootfs after udev settles."
-        rootok=1 ;;
+    ;;
+
+  ZFS\=*|zfs:*|zfs:FILESYSTEM\=*|FILESYSTEM\=*)
+    # root is explicit ZFS root.  Parse it now.
+    # We can handle a root=... param in any of the following formats:
+    # root=ZFS=rpool/ROOT
+    # root=zfs:rpool/ROOT
+    # root=zfs:FILESYSTEM=rpool/ROOT
+    # root=FILESYSTEM=rpool/ROOT
+
+    # Strip down to just the pool/fs
+    root="${root#zfs:}"
+    root="${root#FILESYSTEM=}"
+    root="zfs:${root#ZFS=}"
+    rootok=1
+
+    info "ZFS: Set ${root} as bootfs."
+    ;;
 esac
 
-if [ "$rootok" != "1" ] ; then
+# Make sure Dracut is happy that we have a root and will wait for ZFS
-	zpool import -aN
+# modules to settle before mounting.
-	zfsbootfs=`zpool list -H -o bootfs | grep -v ^-$ -m 1`
+ln -s /dev/null /dev/root 2>/dev/null
-	if [ -n "$zfsbootfs" ] ; then
+echo '[ -e /dev/zfs ]' > $hookdir/initqueue/finished/zfs.sh
-		root="zfs:$zfsbootfs"
-		rootfs="zfs"
-		rootok=1
-	fi
-	zpool list -H | while read fs rest ; do zpool export "$fs" ; done
-fi

dracut/90zfs/zfs-genrules.sh

@@ -1,12 +0,0 @@
-if [ "${root%%:*}" = "zfs" ]; then
-    [ -d /dev/.udev/rules.d ] || mkdir -p /dev/.udev/rules.d
-    {
-    printf 'KERNEL=="%s", SYMLINK+="root"\n' null 
-    printf 'SYMLINK=="%s", SYMLINK+="root"\n' null 
-    } >> /dev/.udev/rules.d/99-zfs.rules
-    
-    printf '[ -e "%s" ] && { ln -s "%s" /dev/root 2>/dev/null; rm "$job"; }\n' \
-	"/dev/null" "/dev/null" >> /initqueue-settled/zfssymlink.sh
-
-    echo '[ -e /dev/root ]' > /initqueue-finished/zfs.sh
-fi