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---
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multipath/11-dm-mpath.rules | 34 ++++++++++++++++++++++++++++++++++
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multipath/Makefile | 2 ++
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2 files changed, 36 insertions(+)
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Index: multipath-tools-130222/multipath/11-dm-mpath.rules
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===================================================================
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--- /dev/null
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+++ multipath-tools-130222/multipath/11-dm-mpath.rules
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@@ -0,0 +1,34 @@
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+ACTION!="add|change", GOTO="mpath_end"
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+ENV{DM_UDEV_RULES_VSN}!="?*", GOTO="mpath_end"
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+ENV{DM_UUID}!="mpath-?*", GOTO="mpath_end"
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+
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+# Do not initiate scanning if no path is available,
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+# otherwise there would be a hang or IO error on access.
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+# We'd like to avoid this, especially within udev processing.
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+ENV{DM_NR_VALID_PATHS}!="?*", IMPORT{db}="DM_NR_VALID_PATHS"
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+ENV{DM_NR_VALID_PATHS}=="0", ENV{DM_NOSCAN}="1"
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+
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+# Also skip all foreign rules if no path is available.
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+# Remember the original value of DM_DISABLE_OTHER_RULES_FLAG
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+# and restore it back once we have at least one path available.
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+IMPORT{db}="DM_DISABLE_OTHER_RULES_FLAG_OLD"
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+ENV{DM_ACTION}=="PATH_FAILED",\
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+ ENV{DM_NR_VALID_PATHS}=="0",\
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+ ENV{DM_DISABLE_OTHER_RULES_FLAG_OLD}=="",\
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+ ENV{DM_DISABLE_OTHER_RULES_FLAG_OLD}="$env{DM_UDEV_DISABLE_OTHER_RULES_FLAG}",\
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+ ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="1"
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+ENV{DM_ACTION}=="PATH_REINSTATED",\
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+ ENV{DM_NR_VALID_PATHS}=="1",\
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+ ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="$env{DM_DISABLE_OTHER_RULES_FLAG_OLD}",\
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+ ENV{DM_DISABLE_OTHER_RULES_FLAG_OLD}="",\
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+ ENV{DM_ACTIVATION}="1"
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+
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+# DM_SUBSYSTEM_UDEV_FLAG0 is the "RELOAD" flag for multipath subsystem.
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+# Drop the DM_ACTIVATION flag here as mpath reloads tables if any of its
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+# paths are lost/recovered. For any stack above the mpath device, this is not
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+# something that should be reacted upon since it would be useless extra work.
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+# It's exactly mpath's job to provide *seamless* device access to any of the
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+# paths that are available underneath.
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+ENV{DM_SUBSYSTEM_UDEV_FLAG0}=="1", ENV{DM_ACTIVATION}="0"
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+
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+LABEL="mpath_end"
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Index: multipath-tools-130222/multipath/Makefile
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===================================================================
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--- multipath-tools-130222.orig/multipath/Makefile
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+++ multipath-tools-130222/multipath/Makefile
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@@ -25,6 +25,7 @@ install:
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$(INSTALL_PROGRAM) -m 755 mpathconf $(DESTDIR)$(bindir)/
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$(INSTALL_PROGRAM) -d $(DESTDIR)/usr/lib/udev/rules.d
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$(INSTALL_PROGRAM) -m 644 multipath.rules $(DESTDIR)/usr/lib/udev/rules.d/62-multipath.rules
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+ $(INSTALL_PROGRAM) -m 644 11-dm-mpath.rules $(DESTDIR)/usr/lib/udev/rules.d/11-dm-mpath.rules
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$(INSTALL_PROGRAM) -d $(DESTDIR)$(mandir)
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$(INSTALL_PROGRAM) -m 644 $(EXEC).8.gz $(DESTDIR)$(mandir)
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$(INSTALL_PROGRAM) -d $(DESTDIR)$(man5dir)
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@@ -33,6 +34,7 @@ install:
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uninstall:
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rm $(DESTDIR)/usr/lib/udev/rules.d/62-multipath.rules
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+ rm $(DESTDIR)/usr/lib/udev/rules.d/11-dm-mpath.rules
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rm $(DESTDIR)$(bindir)/$(EXEC)
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rm $(DESTDIR)$(bindir)/mpathconf
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rm $(DESTDIR)$(mandir)/$(EXEC).8.gz
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