btrfs-progs: add udev rule to use mq-deadline on zoned btrfs

As zoned btrfs uses regular writes for metadata, it needs zone write
locking in the IO scheduler. Add a udev rule that configures an IO
scheduler doing zone write locking.

Signed-off-by: Johannes Thumshirn <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: morbidrsa

64-btrfs-zoned.rules

@@ -0,0 +1,9 @@
+SUBSYSTEM!="block", GOTO="btrfs_end"
+ACTION!="add|change", GOTO="btrfs_end"
+ENV{ID_FS_TYPE}!="btrfs", GOTO="btrfs_end"
+
+# Zoned btrfs needs an IO scheduler that supports zone write locking and
+# currently mq-deadline is the only scheduler capable of this.
+ATTR{queue/zoned}=="host-managed", ATTR{queue/scheduler}="mq-deadline"
+
+LABEL="btrfs_end"

Makefile

@@ -231,7 +231,7 @@ image_objects = image/main.o image/sanitize.o
 all_objects = $(objects) $(cmds_objects) $(libbtrfs_objects) $(convert_objects) \
 	      $(mkfs_objects) $(image_objects) $(libbtrfsutil_objects)
 
-udev_rules = 64-btrfs-dm.rules
+udev_rules = 64-btrfs-dm.rules 64-btrfs-zoned.rules
 
 ifeq ("$(origin V)", "command line")
   BUILD_VERBOSE = $(V)