sys/dev/disk/dm: Add dm-delay target
Examples
=====
# newfs_hammer -L TEST /dev/da3 > /dev/null
# mount_hammer /dev/da3 /HAMMER
# hammer volume-list /HAMMER
/dev/da3
# cd /HAMMER
# time git clone /usr/local/src/dragonfly
Cloning into 'dragonfly'...
done.
Checking out files: 100% (34298/34298), done.
git clone /usr/local/src/dragonfly 2.88s user 4.26s system 48% cpu 14.577 total
=====
# newfs_hammer -L TEST /dev/da3 > /dev/null
# kldload dm
# dmsetup create delay1 --table '0
234436482 delay /dev/da3 0 10 /dev/da3 0 10'
# dmsetup ls --tree
delay1 (255:
504430599)
`- (0:
504430623)
# mount_hammer /dev/mapper/delay1 /HAMMER
# hammer volume-list /HAMMER
/dev/mapper/delay1
# cd /HAMMER
# time git clone /usr/local/src/dragonfly
Cloning into 'dragonfly'...
done.
Checking out files: 100% (34298/34298), done.
git clone /usr/local/src/dragonfly 2.78s user 3.91s system 5% cpu 2:05.05 total