scsi: add multipath support to qemu-pr-helper
Proper support of persistent reservation for multipath devices requires
communication with the multipath daemon, so that the reservation is
registered and applied when a path comes up. The device mapper
utilities provide a library to do so; this patch makes qemu-pr-helper.c
detect multipath devices and, when one is found, delegate the operation
to libmpathpersist.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/configure b/configure
index becc21a..f6edc2a 100755
--- a/configure
+++ b/configure
@@ -290,6 +290,7 @@
sdl=""
sdlabi=""
virtfs=""
+mpath=""
vnc="yes"
sparse="no"
vde=""
@@ -936,6 +937,10 @@
;;
--enable-virtfs) virtfs="yes"
;;
+ --disable-mpath) mpath="no"
+ ;;
+ --enable-mpath) mpath="yes"
+ ;;
--disable-vnc) vnc="no"
;;
--enable-vnc) vnc="yes"
@@ -1479,6 +1484,7 @@
vnc-png PNG compression for VNC server
cocoa Cocoa UI (Mac OS X only)
virtfs VirtFS
+ mpath Multipath persistent reservation passthrough
xen xen backend driver support
xen-pci-passthrough
brlapi BrlAPI (Braile)
@@ -3300,6 +3306,30 @@
fi
##########################################
+# libmpathpersist probe
+
+if test "$mpath" != "no" ; then
+ cat > $TMPC <<EOF
+#include <libudev.h>
+#include <mpath_persist.h>
+unsigned mpath_mx_alloc_len = 1024;
+int logsink;
+int main(void) {
+ struct udev *udev = udev_new();
+ mpath_lib_init(udev);
+ return 0;
+}
+EOF
+ if compile_prog "" "-ludev -lmultipath -lmpathpersist" ; then
+ mpathpersist=yes
+ else
+ mpathpersist=no
+ fi
+else
+ mpathpersist=no
+fi
+
+##########################################
# libcap probe
if test "$cap" != "no" ; then
@@ -5044,12 +5074,24 @@
fi
virtfs=no
fi
+ if test "$mpath" != no && test "$mpathpersist" = yes ; then
+ mpath=yes
+ else
+ if test "$mpath" = yes; then
+ error_exit "Multipath requires libmpathpersist devel"
+ fi
+ mpath=no
+ fi
tools="$tools scsi/qemu-pr-helper\$(EXESUF)"
else
if test "$virtfs" = yes; then
error_exit "VirtFS is supported only on Linux"
fi
virtfs=no
+ if test "$mpath" = yes; then
+ error_exit "Multipath is supported only on Linux"
+ fi
+ mpath=no
fi
fi
@@ -5295,6 +5337,7 @@
echo "Block whitelist (rw) $block_drv_rw_whitelist"
echo "Block whitelist (ro) $block_drv_ro_whitelist"
echo "VirtFS support $virtfs"
+echo "Multipath support $mpath"
echo "VNC support $vnc"
if test "$vnc" = "yes" ; then
echo "VNC SASL support $vnc_sasl"
@@ -5738,6 +5781,9 @@
if test "$virtfs" = "yes" ; then
echo "CONFIG_VIRTFS=y" >> $config_host_mak
fi
+if test "$mpath" = "yes" ; then
+ echo "CONFIG_MPATH=y" >> $config_host_mak
+fi
if test "$vhost_scsi" = "yes" ; then
echo "CONFIG_VHOST_SCSI=y" >> $config_host_mak
fi