After commit b3f1c8c413bc83e4a2cc7a63e4eddf9fe6449052 "qemu-pr-helper: use new
libmultipath API", QEMU started using new libmultipath API, which is not
available on CentOS 7.x.
This fixes that by probing the new libmultipath API in configure. If it fails,
then try probing the old API. If it fails, then consider libmultipath not
available.
With this, configure script defines CONFIG_MPATH_NEW_API that is used in
scsi/qemu-pr-helper.c to use the new libmultipath API.
Fixes: b3f1c8c413bc83e4a2cc7a63e4eddf9fe6449052
BugLink: https://bugs.launchpad.net/qemu/+bug/1786343
Signed-off-by: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
---
configure | 24 +++++++++++++++++++++++-
scsi/qemu-pr-helper.c | 4 ++++
2 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/configure b/configure
index 2a7796ea80..bc6000c24a 100755
--- a/configure
+++ b/configure
@@ -3558,6 +3558,7 @@ fi
# libmpathpersist probe
if test "$mpath" != "no" ; then
+ # probe for the new API
cat > $TMPC <<EOF
#include <libudev.h>
#include <mpath_persist.h>
@@ -3579,8 +3580,26 @@ int main(void) {
EOF
if compile_prog "" "-ludev -lmultipath -lmpathpersist" ; then
mpathpersist=yes
+ mpathpersist_new_api=yes
else
- mpathpersist=no
+ # probe for the old API
+ cat > $TMPC <<EOF
+#include <libudev.h>
+#include <mpath_persist.h>
+unsigned mpath_mx_alloc_len = 1024;
+int logsink;
+int main(void) {
+ struct udev *udev = udev_new();
+ mpath_lib_init(udev);
+ return 0;
+}
+EOF
+ if compile_prog "" "-ludev -lmultipath -lmpathpersist" ; then
+ mpathpersist=yes
+ mpathpersist_new_api=no
+ else
+ mpathpersist=no
+ fi
fi
else
mpathpersist=no
@@ -6421,6 +6440,9 @@ if test "$virtfs" = "yes" ; then
fi
if test "$mpath" = "yes" ; then
echo "CONFIG_MPATH=y" >> $config_host_mak
+ if test "$mpathpersist_new_api" = "yes"; then
+ echo "CONFIG_MPATH_NEW_API=y" >> $config_host_mak
+ fi
fi
if test "$vhost_scsi" = "yes" ; then
echo "CONFIG_VHOST_SCSI=y" >> $config_host_mak
diff --git a/scsi/qemu-pr-helper.c b/scsi/qemu-pr-helper.c
index 1528a712a0..ed037aabee 100644
--- a/scsi/qemu-pr-helper.c
+++ b/scsi/qemu-pr-helper.c
@@ -301,7 +301,11 @@ void put_multipath_config(struct config *conf)
static void multipath_pr_init(void)
{
udev = udev_new();
+#ifdef CONFIG_MPATH_NEW_API
multipath_conf = mpath_lib_init();
+#else
+ mpath_lib_init(udev);
+#endif
}
static int is_mpath(int fd)
--
2.17.1