Egregoros

@dexter If you `zfs set readonly=on mydataset` or likewise with `atime=off`, it doesn't change any of the child datasets. For example:
# zfs get atime rootvg/root
NAME PROPERTY VALUE SOURCE
rootvg/root atime on default
# zfs set atime=off rootvg
# zfs get atime rootvg/root
NAME PROPERTY VALUE SOURCE
rootvg/root atime on temporary

Pre-#OpenZFS on #FreeBSD the right thing happened and atime=off was inherited down the tree.

@wollman CC: @robn

@dexter @wollman @robn I can't reproduce this

21:06:02 skeletor:~ > zfs get atime zdata01
NAME PROPERTY VALUE SOURCE
zdata01 atime off local
21:06:05 skeletor:~ > zfs get atime zdata01/local
NAME PROPERTY VALUE SOURCE
zdata01/local atime off inherited from zdata01
21:06:09 skeletor:~ > freebsd-version -ku
15.0-RELEASE
15.0-RELEASE