blob: d89f387154ca9644afd3e1a4c0f07b5118024dad (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
#!/bin/bash
set -e
b=../scratch/dump-zero
gen() (
local tgt=$1; shift
local log=${tgt%.*}.log
if test -s "$tgt"; then
return
fi
{ set -x; command time --verbose "$@"; } \
>"$tgt" \
2> >(tee >&2 "$log")
)
set -x
CGO_ENABLED=0 go build -trimpath ./cmd/btrfs-rec
mkdir -p "$b.gen"
{ set +x; } &>/dev/null
export GOMEMLIMIT="$(awk '/^MemTotal:/{ print $2 "KiB" }' </proc/meminfo)"
gen $b.gen/0.scandevices.json \
./btrfs-rec --pv=$b.img \
inspect scandevices
gen $b.gen/1.mappings.json \
./btrfs-rec --pv=$b.img \
inspect rebuild-mappings $b.gen/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` again to fill in the
# flags and normalize it.
gen $b.gen/2.mappings.json \
./btrfs-rec --pv=$b.img --mappings=<(sed <$b.gen/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 $b.gen/0.scandevices.json
gen $b.gen/3.nodes.json \
./btrfs-rec --pv=$b.img --mappings=$b.gen/2.mappings.json \
inspect rebuild-nodes $b.gen/0.scandevices.json
# gen $b.gen/4.ls-files.txt \
# ./btrfs-rec --pv=$b.img --mappings=$b.gen/2.mappings.json \
# inspect ls-files
# gen $b.gen/4.ls-trees.txt \
# ./btrfs-rec --pv=$b.img --mappings=$b.gen/2.mappings.json \
# inspect ls-trees --scandevices=$b.gen/0.scandevices.json
|
