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dmsquash-live-root: Use non-persistent metadata snapshots. 

Transient snapshots can take advantage of smaller,
   non-persistent metadata structures.
Make the --readonly option explicit rather than inferred
   for the readonly_overlay target.
Assure that the live-base target is on the BASE_LOOPDEV.
master
Frederick Grose 2015-11-09 10:46:27 -08:00
parent 8e1c4b354c
commit 49c9d8174f
1 changed files with 3 additions and 3 deletions
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6
modules.d/90dmsquash-live/dmsquash-live-root.sh
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@ -141,7 +141,7 @@ do_live_overlay() {
# set up the snapshot
sz=$(blockdev --getsz $BASE_LOOPDEV)
if [ -n "$readonly_overlay" ]; then
echo 0 $sz snapshot $BASE_LOOPDEV $OVERLAY_LOOPDEV p 8 | dmsetup create $readonly_overlay live-ro
echo 0 $sz snapshot $BASE_LOOPDEV $OVERLAY_LOOPDEV N 8 | dmsetup create --readonly live-ro
base="/dev/mapper/live-ro"
over=$RO_OVERLAY_LOOPDEV
else
@ -175,7 +175,7 @@ do_live_overlay() {
fi

# Create a device that always points to a ro base image
echo 0 $sz linear $base 0 | dmsetup create --readonly live-base
echo 0 $sz linear $BASE_LOOPDEV 0 | dmsetup create --readonly live-base
}

# live cd helper function
@ -259,7 +259,7 @@ fi
if [ -b "$OSMIN_LOOPDEV" ]; then
# set up the devicemapper snapshot device, which will merge
# the normal live fs image, and the delta, into a minimzied fs image
echo "0 $( blockdev --getsz $BASE_LOOPDEV ) snapshot $BASE_LOOPDEV $OSMIN_LOOPDEV p 8" | dmsetup create --readonly live-osimg-min
echo "0 $( blockdev --getsz $BASE_LOOPDEV ) snapshot $BASE_LOOPDEV $OSMIN_LOOPDEV N 8" | dmsetup create --readonly live-osimg-min
fi

ROOTFLAGS="$(getarg rootflags)"