90mdraid: fix/adjust force-run script

1) mdadm -As --auto=yes --run 2>&1 | vinfo (removed)

Currently such auto assembly will not complete or force-run partially
assembled arrays. It might assemble "concurrent" separate array and
force-run it, if possible (though the chances of suddenly showing
missing components in this scenario - a script run after udev timeout -
are pretty thin). See [1] for details. Also see #3 below.

2) mdadm -Is --run 2>&1 (removed)

This will only force-run native arrays - arrays in containers will not
be affected. See [1] for details. Also see #3 below.

3) mdadm -R run loop (implicitly handles #1 & #2)

This loop does everywthing that #1 & #2 are expected to do. Thus, the
above invocations are simply redundant and this is the most safe and
flexible option.

Also, it shouldn't be necessary to go under md/ directory, as those are
just symlinks to /dev/md[0-9]*.

Certain checks were changed to strict ones (array state, degraded state)
instead of relying on env tricks.

'cat' was added explicitly to installed programs (it has been used
implicitly in shutdown script either way)

4) mdmon bug

See [1] for details as well. In short - force-run arrays in containers
will not have mdmon started, so we do that manually.

5) stop/run queue magic

Also removed. mdadm -R will only cause change events to the array
itself, and they should not be an issue.

[1] http://article.gmane.org/gmane.linux.raid/35133

Signed-off-by: Michal Soltys <soltys@ziu.info>

modules.d/90mdraid/mdraid_start.sh

@@ -3,23 +3,34 @@
 # ex: ts=8 sw=4 sts=4 et filetype=sh
 
 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
-# run mdadm if udev has settled
-info "Assembling MD RAID arrays"
-udevadm control --stop-exec-queue
-mdadm -As --auto=yes --run 2>&1 | vinfo
-mdadm -Is --run 2>&1 | vinfo
-
-# there could still be some leftover devices
-# which have had a container added
-for md in /dev/md[0-9]* /dev/md/*; do
-    [ -b "$md" ] || continue
-    udevinfo="$(udevadm info --query=env --name=$md)"
-    strstr "$udevinfo" "MD_UUID=" && continue
-    strstr "$udevinfo" "MD_LEVEL=container" && continue
-    strstr "$udevinfo" "DEVTYPE=partition" && continue
-    mdadm --run "$md" 2>&1 | vinfo
-done
-unset udevinfo
-
-ln -s $(command -v mdraid-cleanup) $hookdir/pre-pivot/31-mdraid-cleanup.sh 2>/dev/null
-udevadm control --start-exec-queue
+_md_force_run() {
+    local _udevinfo
+    local _path_s
+    local _path_d
+    # try to force-run anything not running yet
+    for md in /dev/md[0-9]*; do
+        [ -b "$md" ] || continue
+        _udevinfo="$(udevadm info --query=env --name="$md")"
+        strstr "$_udevinfo" "MD_LEVEL=container" && continue
+        strstr "$_udevinfo" "DEVTYPE=partition" && continue
+
+        _path_s="$(udevadm info -q path -n "$md")/md/array_state"
+        [ ! -r "$_path_s" ] && continue
+
+        # inactive ?
+        [ "$(cat "$_path_s")" != "inactive" ] && continue
+
+        mdadm -R "$md" 2>&1 | vinfo
+
+        # still inactive ?
+        [ "$(cat "$_path_s")" = "inactive" ] && continue
+
+        _path_d="${_path_s%/*}/degraded"
+        [ ! -r "$_path_d" ] && continue
+
+        # workaround for mdmon bug
+        [ "$(cat "$_path_d")" -gt "0" ] && mdmon --takeover "$md"
+    done
+}
+
+_md_force_run

modules.d/90mdraid/module-setup.sh

@@ -37,7 +37,7 @@ installkernel() {
 }
 
 install() {
-    dracut_install mdadm partx
+    dracut_install mdadm partx cat
 
 
      # XXX: mdmon really needs to run as non-root?

modules.d/90mdraid/parse-md.sh

@@ -34,6 +34,7 @@ fi
 
 if ! getargbool 1 rd.md.conf -n rd_NO_MDADMCONF; then
     rm -f /etc/mdadm/mdadm.conf /etc/mdadm.conf
+    ln -s $(command -v mdraid-cleanup) $hookdir/pre-pivot/31-mdraid-cleanup.sh 2>/dev/null
 fi
 
 # noiswmd nodmraid for anaconda / rc.sysinit compatibility