[Kimchi-devel] [PATCH v2] Logical Storage Pool: Detect and Enumerate Multipath Block Devices

[zhshzhou at linux.vnet.ibm.com]

From: Zhou Zheng Sheng <zhshzhou at linux.vnet.ibm.com>

When creating a logical storage pool Kimci ignores multipath block
devices. This is on purpose because at the time the kimchi.disks was
implemented, there was not enough time to test every kind of devices.

This patch adds the missing support for multipath block devices. After
this patch, the kimchi.disks will include multipath devices in the
available partition list. The front-end code is also changed
accordingly.

v2
Use the major device number to determine if a deivce is a multipath one.
Use indexOf of the array object to determine if an element is in array.

Signed-off-by: Zhou Zheng Sheng <zhshzhou at linux.vnet.ibm.com>
---
 src/kimchi/disks.py                      | 13 ++++++++++++-
 ui/js/src/kimchi.storagepool_add_main.js |  3 ++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/kimchi/disks.py b/src/kimchi/disks.py
index ce0c5bb..5f004b3 100644
--- a/src/kimchi/disks.py
+++ b/src/kimchi/disks.py
@@ -27,8 +27,19 @@ from kimchi.exception import OperationFailed
 from kimchi.utils import kimchi_log
 
 
+def _get_friendly_dm_path(maj_min):
+    """ Returns user friendly dm path given the device number 'major:min' """
+    dm_name = "/sys/dev/block/%s/dm/name" % maj_min
+    with open(dm_name) as dm_f:
+        content = dm_f.read().rstrip('\n')
+    return "/dev/mapper/" + content
+
+
 def _get_dev_node_path(maj_min):
     """ Returns device node path given the device number 'major:min' """
+    if maj_min.startswith('253:'):
+        return _get_friendly_dm_path(maj_min)
+
     uevent = "/sys/dev/block/%s/uevent" % maj_min
     with open(uevent) as ueventf:
         content = ueventf.read()
@@ -137,7 +148,7 @@ def get_partitions_names():
         # leaf means a partition, a disk has no partition, or a disk not held
         # by any multipath device. Physical volume belongs to no volume group
         # is also listed. Extended partitions should not be listed.
-        if not (dev['type'] in ['part', 'disk'] and
+        if not (dev['type'] in ['part', 'disk', 'mpath'] and
                 dev['fstype'] in ['', 'LVM2_member'] and
                 dev['mountpoint'] == "" and
                 _get_vgname(devNodePath) == "" and
diff --git a/ui/js/src/kimchi.storagepool_add_main.js b/ui/js/src/kimchi.storagepool_add_main.js
index 10833be..a3b60f7 100644
--- a/ui/js/src/kimchi.storagepool_add_main.js
+++ b/ui/js/src/kimchi.storagepool_add_main.js
@@ -27,8 +27,9 @@ kimchi.initStorageAddPage = function() {
         if (data.length > 0) {
             var deviceHtml = $('#partitionTmpl').html();
             var listHtml = '';
+            valid_types = ['part', 'disk', 'mpath'];
             $.each(data, function(index, value) {
-                if (value.type === 'part' || value.type === 'disk') {
+                if (valid_types.indexOf(value.type) != -1) {
                     listHtml += kimchi.template(deviceHtml, value);
                 }
             });
-- 
1.8.5.3