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 <[email protected]>

1 files changed, 62 insertions, 10 deletions

diff --git a/dracut/90zfs/mount-zfs.sh b/dracut/90zfs/mount-zfs.sh
index b4a4de6ff..e067c18a0 100755
--- a/dracut/90zfs/mount-zfs.sh
+++ b/dracut/90zfs/mount-zfs.sh
@@ -2,15 +2,67 @@
 
 . /lib/dracut-lib.sh
 
-if [ "$rootfs" = "zfs" ]; then
-    zfsrootfs=`echo "$root" | sed 's|^zfs:||'`
-    zfspool=`echo "$zfsrootfs" | sed 's|/.*||g'`
-    zpool import -N "$zfspool"
-    mount -o zfsutil -t "$rootfs" "$zfsrootfs" "$NEWROOT"
-    if [ "$?" = "0" ]
-    then
-        ROOTFS_MOUNTED=yes
+ZPOOL_FORCE=""
+if getargbool 0 zfs_force -y zfs.force -y zfsforce ; then
+  warn "ZFS: Will force-import pools if necessary."
+  ZPOOL_FORCE="-f"
+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 ${zfsbootfs} as root."
     else
-        mount -t "$rootfs" "$zfsrootfs" "$NEWROOT" && ROOTFS_MOUNTED=yes
+      # 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
-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