qa: Add test for first damage of lost+found

Fixes: https://tracker.ceph.com/issues/64615
Signed-off-by: Kotresh HR <khiremat@redhat.com>

diff --git a/qa/workunits/fs/damage/test-first-damage-lost-found.sh b/qa/workunits/fs/damage/test-first-damage-lost-found.sh
new file mode 100755 (executable)
index 0000000..2c532c0
--- /dev/null
+++ b/qa/workunits/fs/damage/test-first-damage-lost-found.sh
@@ -0,0 +1,196 @@
+#!/bin/bash
+
+set -ex
+
+FIRST_DAMAGE="first-damage.py"
+FS=cephfs
+METADATA_POOL=cephfs.a.meta
+DATA_POOL=cephfs.a.data
+MOUNT=/mnt1
+PYTHON=python3
+
+function usage {
+  printf '%s: [--fs=<fs_name>] [--metadata-pool=<pool>] [--first-damage=</path/to/first-damage.py>]\n'
+  exit 1
+}
+
+
+function create {
+  ceph config set mds mds_bal_fragment_dirs 0
+  mkdir dir1
+  DIR1_INODE=$(stat -c '%i' dir1)
+  touch dir1/file1
+  DIR1_FILE1_INODE=$(stat -c '%i' dir1/file1)
+}
+
+function flush {
+  ceph tell mds."$FS":0 flush journal
+}
+
+function damage_backtrace {
+  flush
+  ceph fs fail "$FS"
+  sleep 5
+
+  cephfs-journal-tool --rank="$FS":0 event recover_dentries summary
+  # required here as the flush would re-write the below deleted omap
+  cephfs-journal-tool --rank="$FS":0 journal reset
+
+  #remove dir1/file1 omap entry from metadata pool
+  local DIS=$(printf '%llx.%08llx' "$DIR1_INODE" 0)
+  rados --pool="$METADATA_POOL" rmomapkey "$DIS" "file1_head"
+
+  #remove backtrace
+  local FIS=$(printf '%llx.%08llx' "$DIR1_FILE1_INODE" 0)
+  rados --pool="$DATA_POOL" rmxattr "$FIS" "parent"
+
+  ceph fs set "$FS" joinable true
+  sleep 5
+}
+
+function damage_lost_found {
+  flush
+  ceph fs fail "$FS"
+  sleep 5
+  local IS=$(printf '%llx.%08llx' "1" 0)
+
+  local T=$(mktemp -p /tmp)
+  # nuke head version of "lost+found"
+  rados --pool="$METADATA_POOL" getomapval "$IS" lost+found_head "$T"
+  printf '\xff\xff\xff\xf0' | dd of="$T" count=4 bs=1 conv=notrunc,nocreat
+  rados --pool="$METADATA_POOL" setomapval "$IS" lost+found_head --input-file="$T"
+  ceph fs set "$FS" joinable true
+  sleep 5
+}
+
+function recover_damaged_backtrace_file {
+  flush
+  ceph fs fail "$FS"
+  sleep 5
+
+  cephfs-journal-tool --rank="$FS":0 journal reset
+
+  #creates lost+found directory and recovers the damaged backtrace file
+  cephfs-data-scan cleanup
+  cephfs-data-scan init
+  cephfs-data-scan scan_extents
+  cephfs-data-scan scan_inodes
+  cephfs-data-scan scan_links
+
+  ceph fs set "$FS" joinable true
+  sleep 5
+}
+
+function recover {
+  flush
+  ceph fs fail "$FS"
+  sleep 5
+  cephfs-journal-tool --rank="$FS":0 event recover_dentries summary
+  cephfs-journal-tool --rank="$FS":0 journal reset
+  "$PYTHON" $FIRST_DAMAGE --debug /tmp/debug1 --memo /tmp/memo1 "$METADATA_POOL"
+  "$PYTHON" $FIRST_DAMAGE --debug /tmp/debug2 --memo /tmp/memo2 --repair-nosnap  "$METADATA_POOL"
+  "$PYTHON" $FIRST_DAMAGE --debug /tmp/debug3 --memo /tmp/memo3 --remove "$METADATA_POOL"
+  ceph fs set "$FS" joinable true
+  sleep 5
+}
+
+function check_lost_found {
+  stat lost+found || exit 2
+}
+function check {
+  if stat lost+found; then
+    echo should be gone
+    exit 1
+  fi
+}
+
+function mount {
+  #sudo --preserve-env=CEPH_CONF bin/mount.ceph :/ "$MOUNT" -o name=admin,noshare
+  sudo bin/ceph-fuse -c ./ceph.conf /mnt1
+  df -h "$MOUNT"
+}
+
+function main {
+  eval set -- $(getopt --name "$0" --options '' --longoptions 'help,fs:,metadata-pool:,first-damage:,mount:,python:' -- "$@")
+
+  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
+              ;;
+          --mount)
+              MOUNT="$2"
+              shift 2
+              ;;
+          --first-damage)
+              FIRST_DAMAGE="$2"
+              shift 2
+              ;;
+          --python)
+              PYTHON="$2"
+              shift 2
+              ;;
+          --)
+              shift
+              break
+              ;;
+          *)
+              usage
+              ;;
+      esac
+  done
+
+  mount
+
+  pushd "$MOUNT"
+  create
+  popd
+
+  sudo umount -f "$MOUNT"
+
+  # flush dentries/inodes to omap
+  flush
+
+  damage_backtrace
+  # creates lost+found directory
+  recover_damaged_backtrace_file
+
+  sleep 5 # for mds to join
+  mount
+  pushd "$MOUNT"
+  sleep 5 # wait for mount to complete
+
+  # check lost+found is created
+  check_lost_found
+  popd
+  sudo umount -f "$MOUNT"
+  # flush dentries/inodes to omap
+  flush
+
+  # damage lost+found directory
+  damage_lost_found
+  recover
+
+  mount
+
+  pushd "$MOUNT"
+  sleep 5 # wait for mount to complete
+
+  #check 'lost+found' dentry should be gone
+  check
+  popd
+
+  sudo umount -f "$MOUNT"
+}
+
+main "$@"