Remove spaces from CTL devices' default serial numbers

It's awkward to have spaces in CAM device serial numbers. That leads to
such things as device nodes named "/dev/diskid/MYSERIAL%20%20%201". Better
to replace the spaces with "0"s. This change only affects the default
serial numbers for users who don't provide their own.

Reviewed by:	ken, mav
MFC after:	Never
Relnotes:	Yes
Sponsored by:	Spectra Logic Corp
Differential Revision:	https://reviews.freebsd.org/D12263

1 files changed, 7 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index 231cdf25fd72..7d109a5de103 100644
--- a/UPDATING
+++ b/UPDATING
@@ -52,6 +52,13 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW:
 ****************************** SPECIAL WARNING: ******************************
 
 20170912:
+	The default serial number format for CTL LUNs has changed.  This will
+	affect users who use /dev/diskid/* device nodes, or whose FibreChannel
+	or iSCSI clients care about their LUNs' serial numbers.  Users who
+	require serial number stability should hardcode serial numbers in
+	/etc/ctl.conf .
+
+20170912:
 	For 32-bit arm compiled for hard-float support, soft-floating point
 	binaries now always get their shared libraries from
 	LD_SOFT_LIBRARY_PATH (in the past, this was only used if