diff options
Diffstat (limited to 'examples')
| -rwxr-xr-x | examples/diff-dump-tree.sh | 34 | ||||
| -rwxr-xr-x | examples/main.sh | 89 | ||||
| -rwxr-xr-x | examples/mount.sh | 21 |
3 files changed, 144 insertions, 0 deletions
diff --git a/examples/diff-dump-tree.sh b/examples/diff-dump-tree.sh new file mode 100755 index 0000000..c3de337 --- /dev/null +++ b/examples/diff-dump-tree.sh @@ -0,0 +1,34 @@ +#!/bin/bash +readonly image=../scratch/new.img + +###################################################################### + +set -e +( + cd ../btrfs-progs + if ! test -f configure; then + ./autogen.sh + fi + if ! test -f config.status; then + ./configure \ + --disable-documentation \ + --enable-experimental + fi + make +) + +make build + +###################################################################### + +diff -u \ + <(../btrfs-progs/btrfs inspect dump-tree --noscan --csum-items "$image" | + sed -e 's/ UNKNOWN.0 / UNTYPED /g' \ + -e 's/\b18446744073709551615\b/-1/g' \ + -e 's/INODE_REF 6)/INODE_REF ROOT_TREE_DIR)/g' \ + -e 's/ROOT_BACKREF 5)/ROOT_BACKREF FS_TREE)/g' \ + ) \ + <(./bin/btrfs-rec inspect dump-trees --pv="$image" | + sed -E \ + -e 's/([0-9]),/\1/g' \ + ) diff --git a/examples/main.sh b/examples/main.sh new file mode 100755 index 0000000..082576a --- /dev/null +++ b/examples/main.sh @@ -0,0 +1,89 @@ +#!/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 diff --git a/examples/mount.sh b/examples/mount.sh new file mode 100755 index 0000000..4894e94 --- /dev/null +++ b/examples/mount.sh @@ -0,0 +1,21 @@ +#!/bin/bash +readonly image=../scratch/dump-zero.img + +###################################################################### + +set -e +set -x + +make build + +gendir="${image%.img}.gen" +mountpoint="${image%.img}.mnt" +mkdir -p "$mountpoint" + +sudo ./bin/btrfs-rec \ + --pv="$image" + --mappings="$gendir/2.mappings.json" \ + --rebuild \ + inspect mount \ + --skip-filesums \ + "$mountpoint" |