qa/workunites/fs: add first damage test script

Not part of the QA test suites because we don't want to install the
associated script.

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit e9730461a20739d2368a3473ede5ae4a7b0be2ff)

diff --git a/qa/workunits/fs/damage/test-first-damage.sh b/qa/workunits/fs/damage/test-first-damage.sh
new file mode 100755 (executable)
index 0000000..e3e9da4
--- /dev/null
+++ b/qa/workunits/fs/damage/test-first-damage.sh
@@ -0,0 +1,146 @@
+#!/bin/bash
+
+set -ex
+
+FIRST_DAMAGE="first-damage.sh"
+FS=cephfs
+METADATA_POOL=cephfs_meta
+
+function usage {
+  printf '%s: [--fs=<fs_name>] [--metadata-pool=<pool>] [--first-damage=</path/to/first-damage.sh>]\n'
+  exit 1
+}
+
+
+function create {
+  mkdir dir
+  DIR_INODE=$(stat -c '%i' dir)
+  touch dir/a
+  mkdir dir/.snap/1
+  mkdir dir/.snap/2
+  # two snaps
+  rm dir/a
+  mkdir dir/.snap/3
+  # not present in HEAD
+  touch dir/a
+  mkdir dir/.snap/4
+  # one snap
+  rm dir/a
+  touch dir/a
+  mkdir dir/.snap/5
+  # unlink then create
+  rm dir/a
+  touch dir/a
+  # unlink then create, HEAD not snapped
+  ls dir/.snap/*/
+}
+
+function flush {
+  ceph tell mds."$FS":0 flush journal
+}
+
+function damage {
+  local IS=$(printf '%llx.%08llx' "$DIR_INODE" 0)
+  local LS=$(ceph tell mds."$FS":0 dump snaps | jq .last_created)
+
+  local T=$(mktemp -p /tmp)
+
+  # nuke snap 1 version of "a"
+  rados --pool="$METADATA_POOL" getomapval "$IS" a_$(printf %x $((LS-4))) "$T"
+  printf '\xff\xff\xff\xf0' | dd of="$T" count=4 bs=1
+  rados --pool="$METADATA_POOL" setomapval "$IS" a_$(printf %x $((LS-4))) --input-file="$T"
+
+  # nuke snap 4 version of "a"
+  rados --pool="$METADATA_POOL" getomapval "$IS" a_$(printf %x $((LS-1))) "$T"
+  printf '\xff\xff\xff\xff' | dd of="$T" count=4 bs=1
+  rados --pool="$METADATA_POOL" setomapval "$IS" a_$(printf %x $((LS-1))) --input-file="$T"
+
+  rm -f "$T"
+}
+
+function recover {
+  # drop client cache -- approx. umount without unmounting for test
+  echo 3 | sudo tee /proc/sys/vm/drop_caches
+  flush
+  ceph fs fail "$FS"
+  sleep 5
+  cephfs-journal-tool --rank="$FS":0 event recover_dentries summary
+  cephfs-journal-tool --rank="$FS":0 journal reset
+  $FIRST_DAMAGE "$METADATA_POOL"
+  $FIRST_DAMAGE --remove "$METADATA_POOL"
+  ceph fs set "$FS" joinable true
+}
+
+function check {
+  stat dir || exit 1
+  for i in `seq 1 5`; do
+    stat dir/.snap/$i || exit 2
+  done
+  stat dir/.snap/2/a || exit 3
+  stat dir/.snap/5/a || exit 4
+  if stat dir/.snap/1/a; then
+    echo should be gone
+    exit 5
+  fi
+  if stat dir/.snap/3/a; then
+    echo should not ever exist
+    exit 6
+  fi
+  if stat dir/.snap/4/a; then
+    echo should be gone
+    exit 7
+  fi
+}
+
+function cleanup {
+  rmdir dir/.snap/*
+  rm -rf dir
+}
+
+function main {
+  eval set -- $(getopt --name "$0" --options '' --longoptions 'help,fs:,metadata-pool:,first-damage:' -- "$@")
+
+  while [ "$#" -gt 0 ]; do
+      echo "$*"
+      echo "$1"
+      case "$1" in
+          -h|--help)
+              usage
+              ;;
+          --fs)
+              FS="$2"
+              shift 2
+              ;;
+          --metadata-pool)
+              METADATA_POOL="$2"
+              shift 2
+              ;;
+          --first-damage)
+              FIRST_DAMAGE="$2"
+              shift 2
+              ;;
+          --)
+              shift
+              break
+              ;;
+          *)
+              usage
+              ;;
+      esac
+  done
+
+  create
+
+  # flush dentries/inodes to omap
+  (cd / && flush)
+
+  (cd / && damage)
+
+  (cd / && recover)
+
+  check
+
+  cleanup
+}
+
+main "$@"