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From 9ffd83c333bdc7741bfa1a73b3461f1b51208c5f Mon Sep 17 00:00:00 2001
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From: Lukas Nykryn <lnykryn@redhat.com>
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Date: Tue, 12 Feb 2019 16:58:16 +0100
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Subject: [PATCH] rules: add elevator= kernel command line parameter
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Kernel removed the elevator= option, so let's reintroduce
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it for rhel8 via udev rule.
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RHEL-only
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Related: #2138081
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---
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rules.d/40-elevator.rules | 20 ++++++++++++++++++++
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rules.d/meson.build | 3 ++-
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2 files changed, 22 insertions(+), 1 deletion(-)
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create mode 100644 rules.d/40-elevator.rules
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diff --git a/rules.d/40-elevator.rules b/rules.d/40-elevator.rules
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new file mode 100644
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index 0000000000..dbe8fc81a4
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--- /dev/null
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+++ b/rules.d/40-elevator.rules
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@@ -0,0 +1,20 @@
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+# We aren't adding devices skip the elevator check
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+ACTION!="add", GOTO="sched_out"
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+
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+SUBSYSTEM!="block", GOTO="sched_out"
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+ENV{DEVTYPE}!="disk", GOTO="sched_out"
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+
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+# Technically, dm-multipath can be configured to use an I/O scheduler.
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+# However, there are races between the 'add' uevent and the linking in
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+# of the queue/scheduler sysfs file. For now, just skip dm- devices.
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+KERNEL=="dm-*|md*", GOTO="sched_out"
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+
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+# Skip bio-based devices, which don't support an I/O scheduler.
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+ATTR{queue/scheduler}=="none", GOTO="sched_out"
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+
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+# If elevator= is specified on the kernel command line, change the
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+# scheduler to the one specified.
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+IMPORT{cmdline}="elevator"
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+ENV{elevator}!="", ATTR{queue/scheduler}="$env{elevator}"
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+
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+LABEL="sched_out"
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\ No newline at end of file
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diff --git a/rules.d/meson.build b/rules.d/meson.build
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index 70f48e877b..4e88400d02 100644
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--- a/rules.d/meson.build
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+++ b/rules.d/meson.build
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@@ -5,7 +5,8 @@ install_data(
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install_dir : udevrulesdir)
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rules = [
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- [files('40-redhat.rules',
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+ [files('40-elevator.rules',
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+ '40-redhat.rules',
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'60-autosuspend.rules',
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'60-block.rules',
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'60-cdrom_id.rules',
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