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#!/bin/bash
readonly image=../scratch/dump-zero.img
######################################################################
set -e
run-btrfs-rec() {
local tgt=$1; shift
local log=${tgt%.*}.log
if test -s "$tgt"; then
return
fi
{
set -x;
command time --verbose \
./bin/btrfs-rec \
--pv="$image" \
--profile.cpu="${tgt%.*}.cpu.pprof" \
--profile.allocs="${tgt%.*}.allocs.pprof" \
"$@"
} >"$tgt" 2> >(tee >&2 "$log")
}
set -x
make build
gendir="${image%.img}.gen"
mkdir -p "$gendir"
export GOMEMLIMIT="$(awk '/^MemTotal:/{ print $2 "KiB" }' </proc/meminfo)"
{ set +x; } &>/dev/null
######################################################################
# 0: initial scan ##########################################
run-btrfs-rec $gendir/0.scandevices.json \
inspect rebuild-mappings scan
run-btrfs-rec $gendir/0.nodes.json \
inspect rebuild-mappings list-nodes $gendir/0.scandevices.json
# 1-2: rebuild chunk/dev-ext/blockgroup trees ##############
run-btrfs-rec $gendir/1.mappings.json \
inspect rebuild-mappings process $gendir/0.scandevices.json
# 1.mappings.log says:
#
# detailed report:
# ... unmapped physical region: dev=1 beg=0x0000000000000000 end=0x0000000000100000 (size=0x0000000000100000)
# ... unmapped physical region: dev=1 beg=0x0000000000500000 end=0x0000000001500000 (size=0x0000000001000000)
# ... unmapped physical region: dev=1 beg=0x0000003b9e650000 end=0x0000003b9e656000 (size=0x0000000000006000)
# ... umapped summed logical region: beg=0x0000000000d00000 end=0x0000000001500000 (size=0x0000000000800000)
# ... umapped block group: beg=0x0000000000500000 end=0x0000000000d00000 (size=0x0000000000800000) flags=METADATA|single
# ... umapped block group: beg=0x0000000000d00000 end=0x0000000001500000 (size=0x0000000000800000) flags=DATA|single
#
# Those 2 block groups clearly both slot in to that 2nd physical
# region (which is roughly beg=5MB end=22MB). Since that whole
# region's data was lost (roughly the 1st 100MB was lost), it doesn't
# matter which order we put the 2 block groups in within that physical
# region. So just put them in laddr order.
#
# And then run that through `rebuild-mappings process` again to fill in the
# flags and normalize it.
run-btrfs-rec $gendir/2.mappings.json \
--mappings=<(sed <$gendir/1.mappings.json \
-e '2a{"LAddr":5242880,"PAddr":{"Dev":1,"Addr":5242880},"Size":1},' \
-e '2a{"LAddr":13631488,"PAddr":{"Dev":1,"Addr":13631488},"Size":1},') \
inspect rebuild-mappings process $gendir/0.scandevices.json
# 3: rebuild other trees ###################################
run-btrfs-rec $gendir/3.trees.json \
--mappings=$gendir/2.mappings.json \
--node-list=$gendir/0.nodes.json \
inspect rebuild-trees
# 4: dump data from the FS #################################
run-btrfs-rec $gendir/4.ls-files.txt \
--mappings=$gendir/2.mappings.json \
--node-list=$gendir/0.nodes.json \
--trees=$gendir/3.trees.json \
inspect ls-files
run-btrfs-rec $gendir/4.ls-trees.txt \
--mappings=$gendir/2.mappings.json \
--node-list=$gendir/0.nodes.json \
--trees=$gendir/3.trees.json \
inspect ls-trees
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