[PATCH v3 1/7] overlay: add filesystem check helper

zhangyi (F)
2018-01-12T11:59:42Z

Add filesystem check helpers for the upcoming fsck.overlay utility,
and hook them to _check_test_fs and _check_scratch_fs. This helper
works only if fsck.overlay exists.

[ _check_test_fs/_check_scratch_fs part picked from Amir's patch, thanks ]

Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
---
common/config | 1 +
common/overlay | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
common/rc | 4 +--
3 files changed, 83 insertions(+), 2 deletions(-)

diff --git a/common/config b/common/config
index d0fbfe5..0505b71 100644
--- a/common/config
+++ b/common/config
@@ -236,6 +236,7 @@ case "$HOSTOS" in
export MKFS_REISER4_PROG="`set_prog_path mkfs.reiser4`"
export E2FSCK_PROG="`set_prog_path e2fsck`"
export TUNE2FS_PROG="`set_prog_path tune2fs`"
+ export FSCK_OVERLAY_PROG="`set_prog_path fsck.overlay`"
;;
esac

diff --git a/common/overlay b/common/overlay
index 1da4ab1..e7f0e62 100644
--- a/common/overlay
+++ b/common/overlay
@@ -151,3 +151,83 @@ _require_scratch_overlay_feature()
_notrun "${FSTYP} feature '${feature}' cannot be enabled on ${SCRATCH_DEV}"
_scratch_unmount
}
+
+_overlay_fsck_dirs()
+{
+ local lowerdir=$1
+ local upperdir=$2
+ local workdir=$3
+ local options=$4
+
+ [[ ! -x "$FSCK_OVERLAY_PROG" ]] && return 0
+
+ $FSCK_OVERLAY_PROG -o lowerdir=$lowerdir -o upperdir=$upperdir \
+ -o workdir=$workdir $options
+}
+
+_overlay_check_dirs()
+{
+ local lowerdir=$1
+ local upperdir=$2
+ local workdir=$3
+ local err=0
+
+ _overlay_fsck_dirs $* $FSCK_OPTIONS >>$tmp.fsck 2>&1
+ if [ $? -ne 0 ]; then
+ _log_err "_overlay_check_fs: overlayfs on $lowerdir,$upperdir,$workdir is inconsistent"
+ echo "*** fsck.overlay output ***" >>$seqres.full
+ cat $tmp.fsck >>$seqres.full
+ echo "*** end fsck.overlay output" >>$seqres.full
+
+ echo "*** mount output ***" >>$seqres.full
+ _mount >>$seqres.full
+ echo "*** end mount output" >>$seqres.full
+ err=1
+ fi
+ rm -f $tmp.fsck
+
+ if [ $err != 0 ]; then
+ status=1
+ if [ "$iam" != "check" ]; then
+ exit 1
+ fi
+ return 1
+ fi
+
+ return 0
+}
+
+_overlay_check_fs()
+{
+ local base_dev=$3
+ local base_mnt=$4
+
+ [ "$FSTYP" = overlay ] || return 0
+
+ # Base fs needs to be mounted to check overlay dirs
+ local mounted=""
+ [ -z "$base_dev" ] || mounted=`_is_mounted $base_dev`
+ [ -n "$mounted" ] || _overlay_base_mount $*
+
+ # No need to umount overlay for dir checks with default -n option
+ _overlay_check_dirs $base_mnt/$OVL_LOWER $base_mnt/$OVL_UPPER \
+ $base_mnt/$OVL_WORK
+ local ret=$?
+
+ [ -n "$mounted" ] || _overlay_base_unmount "$base_dev" "$base_mnt"
+ return $ret
+}
+
+_check_overlay_test_fs()
+{
+ _overlay_check_fs OVL_BASE_TEST_DEV OVL_BASE_TEST_DIR \
+ "$OVL_BASE_TEST_DEV" "$OVL_BASE_TEST_DIR" \
+ $TEST_FS_MOUNT_OPTS $SELINUX_MOUNT_OPTIONS
+}
+
+_check_overlay_scratch_fs()
+{
+ _overlay_check_fs OVL_BASE_SCRATCH_DEV OVL_BASE_SCRATCH_MNT \
+ "$OVL_BASE_SCRATCH_DEV" "$OVL_BASE_SCRATCH_MNT" \
+ $OVL_BASE_MOUNT_OPTIONS $SELINUX_MOUNT_OPTIONS
+}
diff --git a/common/rc b/common/rc
index 9216efd..a49f736 100644
--- a/common/rc
+++ b/common/rc
@@ -2537,7 +2537,7 @@ _check_test_fs()
# no way to check consistency for GlusterFS
;;
overlay)
- # no way to check consistency for overlay
+ _check_overlay_test_fs
;;
pvfs2)
;;
@@ -2592,7 +2592,7 @@ _check_scratch_fs()
# no way to check consistency for GlusterFS
;;
overlay)
- # no way to check consistency for overlay
+ _check_overlay_scratch_fs
;;
pvfs2)
;;
--
2.9.5