2 # SPDX-License-Identifier: GPL-2.0-or-later
3 # Copyright (c) 2021 Oracle. All Rights Reserved.
7 # Reproducer for a deadlock in xfs_rename reported by Wenli Xie.
9 # When overlayfs is running on top of xfs and the user unlinks a file in the
10 # overlay, overlayfs will create a whiteout inode and ask us to "rename" the
11 # whiteout file atop the one being unlinked. If the file being unlinked loses
12 # its one nlink, we then have to put the inode on the unlinked list.
14 # This requires us to grab the AGI buffer of the whiteout inode to take it
15 # off the unlinked list (which is where whiteouts are created) and to grab
16 # the AGI buffer of the file being deleted. If the whiteout was created in
17 # a higher numbered AG than the file being deleted, we'll lock the AGIs in
18 # the wrong order and deadlock.
20 # Note that this test doesn't do anything xfs-specific so it's a generic test.
21 # This is a regression test for commit 6da1b4b1ab36 ("xfs: fix an ABBA deadlock
25 seqres=$RESULT_DIR/$seq
26 echo "QA output created by $seq"
30 status=1 # failure is the default!
31 trap "_cleanup; exit \$status" 0 1 2 3 15
40 # get standard environment, filters and checks
43 # real QA test starts here
46 test "$FSTYP" = "overlay" && _notrun "Test does not apply to overlayfs."
47 _require_extra_fs overlay
51 _scratch_mkfs >> $seqres.full
53 _supports_filetype $SCRATCH_MNT || _notrun "overlayfs test requires d_type"
55 mkdir $SCRATCH_MNT/lowerdir
56 mkdir $SCRATCH_MNT/lowerdir1
57 mkdir $SCRATCH_MNT/lowerdir/etc
58 mkdir $SCRATCH_MNT/workers
59 echo salts > $SCRATCH_MNT/lowerdir/etc/access.conf
60 touch $SCRATCH_MNT/running
63 test -e $SCRATCH_MNT/running || return
64 rm -f $SCRATCH_MNT/running
66 while [ "$(ls $SCRATCH_MNT/workers/ | wc -l)" -gt 0 ]; do
73 local mergedir="$SCRATCH_MNT/merged$tag"
74 local l="lowerdir=$SCRATCH_MNT/lowerdir:$SCRATCH_MNT/lowerdir1"
75 local u="upperdir=$SCRATCH_MNT/upperdir$tag"
76 local w="workdir=$SCRATCH_MNT/workdir$tag"
77 local i="index=off,nfs_export=off"
79 touch $SCRATCH_MNT/workers/$tag
80 while test -e $SCRATCH_MNT/running; do
81 rm -rf $SCRATCH_MNT/merged$tag
82 rm -rf $SCRATCH_MNT/upperdir$tag
83 rm -rf $SCRATCH_MNT/workdir$tag
84 mkdir $SCRATCH_MNT/merged$tag
85 mkdir $SCRATCH_MNT/workdir$tag
86 mkdir $SCRATCH_MNT/upperdir$tag
88 mount -t overlay overlay -o "$l,$u,$w,$i" $mergedir
89 mv $mergedir/etc/access.conf $mergedir/etc/access.conf.bak
90 touch $mergedir/etc/access.conf
91 mv $mergedir/etc/access.conf $mergedir/etc/access.conf.bak
92 touch $mergedir/etc/access.conf
95 rm -f $SCRATCH_MNT/workers/$tag
98 for i in $(seq 0 $((4 + LOAD_FACTOR)) ); do
102 sleep $((30 * TIME_FACTOR))
105 echo Silence is golden.