I tested the patch and it works fine.
Could you add following patch if you approve?
commit bae7528fa92283726caac1ec7a6c306274f8899d
Author: Masatake YAMATO <yamato@xxxxxxxxxx>
Date: Mon Aug 22 17:44:55 2016 +0900
dm-ioctl: add a lvm private flag
When I run "dmsetup ls" under dm-ioctl patched strace,
"strange DM_???" are found in its output.
# ./strace -e ioctl dmsetup ls > /dev/null
ioctl(3, DM_VERSION, {version=4.0.0, flags=0x4 /* DM_??? */}, ...
ioctl(3, DM_LIST_DEVICES, {version=4.0.0, flags=0x4 /* DM_??? */}, ...
...
Associated definion for DM_??? is in lvm2 source tree. This commit
imports the definion to dm-ioctl list.
Signed-off-by: Masatake YAMATO <yamato@xxxxxxxxxx>
diff --git a/xlat/dm_flags.in b/xlat/dm_flags.in
index ab4285c..1e7132b 100644
--- a/xlat/dm_flags.in
+++ b/xlat/dm_flags.in
@@ -1,5 +1,7 @@
DM_READONLY_FLAG
DM_SUSPEND_FLAG
+/* Defined in lvm2/libdm/ioctl/libdm-iface.c */
+DM_EXISTS_FLAG 0x00000004
DM_PERSISTENT_DEV_FLAG
DM_STATUS_TABLE_FLAG
DM_ACTIVE_PRESENT_FLAG
--
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