From: Martin Wilck <mwilck@xxxxxxxx> The kernel's autoload mechanism for SCSI device handlers doesn't work during SCSI device probing. While it's possible to load and attach device handlers after probing, it has disadvantages: the handlers are useful for error handling even before multipathd has started, and at least up to kernel 5.17, the sysfs "access_state" attribute will remain invisible for already probed devices. Distributions will therefore want to make sure the handlers are either built-in in the kernel, or loaded early. Add functionality to create and install a modules-load.d file with a list of handlers to load. By default, the list is empty, and no file will be generated. The list can be specified at install-time like this: make SCSI_DH_MODULES_PRELOAD="scsi_dh_rdac scsi_dh_emc" install dracut automatically adds modules-load.d files and the modules they reference to the initramfs. Note: distributions that compile scsi_mod as a module may rather want to use a modprobe.d file with a statement like this: softdep scsi_mod post: scsi_dh_alua scsi_dh_rdac Signed-off-by: Martin Wilck <mwilck@xxxxxxxx> --- Makefile.inc | 5 +++++ multipath/Makefile | 6 ++++++ multipath/scsi_dh.conf | 2 ++ 3 files changed, 13 insertions(+) create mode 100644 multipath/scsi_dh.conf diff --git a/Makefile.inc b/Makefile.inc index 5223c96..3342af6 100644 --- a/Makefile.inc +++ b/Makefile.inc @@ -9,6 +9,11 @@ # Uncomment to disable dmevents polling support # ENABLE_DMEVENTS_POLL = 0 +# List of scsi device handler modules to load on boot, e.g. +# SCSI_DH_MODULES_PRELOAD := scsi_dh_alua scsi_dh_rdac +SCSI_DH_MODULES_PRELOAD := + + PKGCONFIG ?= pkg-config ifeq ($(TOPDIR),) diff --git a/multipath/Makefile b/multipath/Makefile index 015f73c..c930499 100644 --- a/multipath/Makefile +++ b/multipath/Makefile @@ -29,11 +29,17 @@ install: $(INSTALL_PROGRAM) -m 644 $(EXEC).8 $(DESTDIR)$(man8dir) $(INSTALL_PROGRAM) -d $(DESTDIR)$(man5dir) $(INSTALL_PROGRAM) -m 644 $(EXEC).conf.5 $(DESTDIR)$(man5dir) +ifneq ($(SCSI_DH_MODULES_PRELOAD),) + $(INSTALL_PROGRAM) -m 644 scsi_dh.conf $(DESTDIR)$(modulesloaddir)/scsi_dh.conf + for _x in $(SCSI_DH_MODULES_PRELOAD); do echo "$$_x"; done \ + >>$(DESTDIR)$(modulesloaddir)/scsi_dh.conf +endif uninstall: $(RM) $(DESTDIR)$(bindir)/$(EXEC) $(RM) $(DESTDIR)$(udevrulesdir)/11-dm-mpath.rules $(RM) $(DESTDIR)$(modulesloaddir)/multipath.conf + $(RM) $(DESTDIR)$(modulesloaddir)/scsi_dh.conf $(RM) $(DESTDIR)$(libudevdir)/rules.d/56-multipath.rules $(RM) $(DESTDIR)$(man8dir)/$(EXEC).8 $(RM) $(DESTDIR)$(man5dir)/$(EXEC).conf.5 diff --git a/multipath/scsi_dh.conf b/multipath/scsi_dh.conf new file mode 100644 index 0000000..a13dd82 --- /dev/null +++ b/multipath/scsi_dh.conf @@ -0,0 +1,2 @@ +# Load SCSI device handler modules for multipath early +# This file may be empty -- 2.34.1 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel
