On Fri, Feb 04, 2022 at 08:30:36AM +0100, mwilck@xxxxxxxx wrote: > 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 > Reviewed-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx> > 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
