vdo: use defines also for configuration defines

Keep single source for most of values printed in lvm.conf
(still needs some conversion)

Correct max for logical threads to 60
(we may refuse some older configuration which might eventually
user higher numbers - but so far let's assume no user have ever set this
as it's been non-trivial and if would complicate code unnecessarily.)

Accept maximum of 4PiB for virtual size of VDO LV
(lvm2 will drop 'header borders to 0 for this case').

1 files changed, 4 insertions, 5 deletions

diff --git a/conf/example.conf.in b/conf/example.conf.in
index 94f7a23fd..4e5482fee 100644
--- a/conf/example.conf.in
+++ b/conf/example.conf.in
@@ -625,13 +625,12 @@ allocation {
 	# Enables or disables whether VDO volume should tag its latency-critical
 	# writes with the REQ_SYNC flag. Some device mapper targets such as dm-raid5
 	# process writes with this flag at a higher priority.
-	# Default is enabled.
 	# This configuration option has an automatic default value.
 	# vdo_use_metadata_hints = 1
 
 	# Configuration option allocation/vdo_minimum_io_size.
 	# The minimum IO size for VDO volume to accept, in bytes.
-	# Valid values are 512 or 4096. The recommended and default value is 4096.
+	# Valid values are 512 or 4096. The recommended value is 4096.
 	# This configuration option has an automatic default value.
 	# vdo_minimum_io_size = 4096
 
@@ -684,7 +683,7 @@ allocation {
 	# Configuration option allocation/vdo_bio_threads.
 	# Specifies the number of threads to use for submitting I/O
 	# operations to the storage device of VDO volume.
-	# The value must be in range [1..100]
+	# The value must be in range [1..100].
 	# Each additional thread after the first will use an additional 18MiB of RAM,
 	# plus 1.12 MiB of RAM per megabyte of configured read cache size.
 	# This configuration option has an automatic default value.
@@ -698,7 +697,7 @@ allocation {
 
 	# Configuration option allocation/vdo_cpu_threads.
 	# Specifies the number of threads to use for CPU-intensive work such as
-	# hashing or compression for VDO volume. The value must be in range [1..100]
+	# hashing or compression for VDO volume. The value must be in range [1..100].
 	# This configuration option has an automatic default value.
 	# vdo_cpu_threads = 2
 
@@ -716,7 +715,7 @@ allocation {
 	# processing based on the hash value computed from the block data.
 	# A logical thread count of 9 or more will require explicitly specifying
 	# a sufficiently large block map cache size, as well.
-	# The value must be in range [0..100].
+	# The value must be in range [0..60].
 	# vdo_hash_zone_threads, vdo_logical_threads and vdo_physical_threads must be
 	# either all zero or all non-zero.
 	# This configuration option has an automatic default value.