This test tests three conditions where orphan items need to be cleaned up:
1) Default subvolume is fs tree root (mkfs default)
2) Default subvolume has been set explicitly to another subvolume (set-default)
3) Looking up a subvolume during a traversal
In the kernel, these three cases use separate mechanisms to look up
the subvolumes. There was a bug in the kernel where case #2 wasn't getting
handled and so orphan items would never be cleaned up if the default
subvolume was explicitly set. This issue was fixed with the upstream commit:
btrfs: cleanup orphans while looking up default subvolume
Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
---
tests/btrfs/083 | 155 ++++++++++++++++++++++++++++++++++++++++++++++++++++
tests/btrfs/083.out | 5 ++
tests/btrfs/group | 1 +
3 files changed, 161 insertions(+)
create mode 100755 tests/btrfs/083
create mode 100644 tests/btrfs/083.out
diff --git a/tests/btrfs/083 b/tests/btrfs/083
new file mode 100755
index 0000000..12416d9
--- /dev/null
+++ b/tests/btrfs/083
@@ -0,0 +1,155 @@
+#!/bin/bash
+# FS QA Test No. btrfs/083
+#
+# Tests to ensure that orphan items are properly created and cleaned up
+# on next mount.
+#
+# There are three cases where orphan items may be cleaned up:
+# 1) Default subvolume is fs tree root (mkfs default)
+# 2) Default subvolume is explicitly created subvolume
+# (i.e. btrfs subvol set-default)
+# 3) Non-default subvolume lookup
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015 SUSE. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+#
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1 # failure is the default!
+
+_cleanup()
+{
+ _cleanup_flakey
+ rm -f $tmp.*
+}
+
+trap "_cleanup ; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/dmflakey
+
+# real QA test starts here
+_supported_fs btrfs
+_supported_os Linux
+_require_scratch
+_require_dm_flakey
+_need_to_be_root
+
+rm -f $seqres.full
+
+has_orphan_item() {
+ INO=$1
+ if btrfs-debug-tree $SCRATCH_DEV | \
+ grep -q "key (ORPHAN ORPHAN_ITEM $INO)"; then
+ return 0
+ fi
+ return 1
+}
+
+test_orphan() {
+ PRECMD=$1
+ SUB=0
+
+ _scratch_mkfs >> $seqres.full 2>&1
+ _init_flakey
+
+ _mount_flakey
+
+ $PRECMD
+
+ TESTPATH=$SCRATCH_MNT/testdir/testfile
+ DIR=$(dirname $TESTPATH)
+
+ [ -d "$DIR" ] || mkdir -p $DIR
+
+ SIZE=$(( 1024 * 1024 ))
+ run_check dd if=/dev/zero of=$TESTPATH bs=$SIZE count=1
+
+ INO=$(stat -c %i $TESTPATH)
+
+ # Orphan item won't be created if the file doesn't make it to disk
+ sync
+
+ # Open and delete the file
+ exec 27<$TESTPATH
+ rm -f $TESTPATH
+
+ # Ensure the unlink (and orphan item creation) hits the disk
+ sync
+
+ # Turn off writes before closing so the orphan item will be left behind
+ _load_flakey_table $FLAKEY_DROP_WRITES
+
+ # Close the file so we can umount
+ exec 27>&-
+
+ # Orphan item should be on disk if operating correctly
+ _unmount_flakey
+ _load_flakey_table $FLAKEY_ALLOW_WRITES
+ if ! has_orphan_item $INO; then
+ echo "ERROR: No orphan item found after umount."
+ return
+ fi
+ _mount_flakey
+
+ # If $DIR is a subvolume, this will cause a lookup and orphan cleanup
+ (cd $DIR; true)
+
+ # Orphan item will be cleaned up during mount but won't be on
+ # disk until there's a sync.
+ sync
+
+ _unmount_flakey
+ if has_orphan_item $INO; then
+ echo "ERROR: Orphan item found after successful mount/sync."
+ fi
+ _cleanup_flakey
+}
+
+new_subvolume() {
+ _run_btrfs_util_prog subvol create $SCRATCH_MNT/testdir
+}
+
+new_default() {
+ new_subvolume
+ SUB=$(btrfs subvol list $SCRATCH_MNT |awk '{print $2}')
+ _run_btrfs_util_prog subvol set-default $SUB $SCRATCH_MNT
+
+ _unmount_flakey
+ _mount_flakey
+}
+
+echo "Testing with fs root as default subvolume"
+test_orphan true
+
+echo "Testing with explicit default subvolume"
+test_orphan new_default
+
+echo "Testing with orphan on non-default subvolume"
+test_orphan new_subvolume
+
+echo "Silence is golden"
+status=0
+exit
diff --git a/tests/btrfs/083.out b/tests/btrfs/083.out
new file mode 100644
index 0000000..c3c99f1
--- /dev/null
+++ b/tests/btrfs/083.out
@@ -0,0 +1,5 @@
+QA output created by 083
+Testing with fs root as default subvolume
+Testing with explicit default subvolume
+Testing with orphan on non-default subvolume
+Silence is golden
diff --git a/tests/btrfs/group b/tests/btrfs/group
index fd2fa76..c48fc0c 100644
--- a/tests/btrfs/group
+++ b/tests/btrfs/group
@@ -85,3 +85,4 @@
080 auto snapshot
081 auto quick clone
082 auto quick remount
+083 auto quick metadata subvol
--
1.8.5.2
--
Jeff Mahoney
SUSE Labs
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