udev rules: introduce rules for cluster-md to confirm device

For cluster scenario, add device is different with native raid.
When a node issues adds a device, then the node will broadcast
a message with UUID to other nodes in the cluster. If receiving
node can find the device with the specific UUID, it must confirm
the device, otherwise reports it is missing.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

diff --git a/Makefile b/Makefile
index 021d3adf3ed1d4f1564da387ea5fc1c32a08b576..0977f27d3750bb9a9c5693e32eb28555c906ab06 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -256,8 +256,10 @@ install-man: mdadm.8 md.4 mdadm.conf.5 mdmon.8
        $(INSTALL) -D -m 644 md.4 $(DESTDIR)$(MAN4DIR)/md.4
        $(INSTALL) -D -m 644 mdadm.conf.5 $(DESTDIR)$(MAN5DIR)/mdadm.conf.5
 
-install-udev: udev-md-raid-arrays.rules udev-md-raid-assembly.rules udev-md-raid-creating.rules
-       @for file in 01-md-raid-creating.rules 63-md-raid-arrays.rules 64-md-raid-assembly.rules ; \
+install-udev: udev-md-raid-arrays.rules udev-md-raid-assembly.rules udev-md-raid-creating.rules \
+               udev-md-clustered-confirm-device.rules 
+       @for file in 01-md-raid-creating.rules 63-md-raid-arrays.rules 64-md-raid-assembly.rules \
+               69-md-clustered-confirm-device.rules ; \
        do sed -e 's,BINDIR,$(BINDIR),g' udev-$${file#??-} > .install.tmp.1 && \
           $(ECHO) $(INSTALL) -D -m 644 udev-$${file#??-} $(DESTDIR)$(UDEVDIR)/rules.d/$$file ; \
           $(INSTALL) -D -m 644 .install.tmp.1 $(DESTDIR)$(UDEVDIR)/rules.d/$$file ; \

diff --git a/udev-md-clustered-confirm-device.rules b/udev-md-clustered-confirm-device.rules
new file mode 100644 (file)
index 0000000..3e5381e
--- /dev/null
+++ b/udev-md-clustered-confirm-device.rules
@@ -0,0 +1,21 @@
+# do not edit this file, it will be overwritten on update
+
+SUBSYSTEM!="block", GOTO="clustermd_end"
+
+# handle md arrays
+KERNEL!="md*", GOTO="clustermd_end"
+ENV{DEVTYPE}!="disk", GOTO="clustermd_end"
+ACTION!="change", GOTO="clustermd_end"
+ENV{EVENT}!="ADD_DEVICE", GOTO="clustermd_end"
+ENV{DEVICE_UUID}!="?*", GOTO="clustermd_end"
+ENV{RAID_DISK}!="?*", GOTO="clustermd_end"
+
+# Based on the received UUID, node confirms the device if
+# it is found by blkid, otherwise the node reports it is
+# missing.
+PROGRAM="BINDIR/blkid -o device -t UUID_SUB=$env{DEVICE_UUID}", ENV{.md.newdevice} = "$result"
+
+ENV{.md.newdevice}!="", RUN+="BINDIR/mdadm --manage $env{DEVNAME} --cluster-confirm $env{RAID_DISK}:$env{.md.newdevice}"
+ENV{.md.newdevice}=="", RUN+="BINDIR/mdadm --manage $env{DEVNAME} --cluster-confirm $env{RAID_DISK}:missing"
+
+LABEL="clustermd_end"