2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (C) 2019 CTERA Networks. All Rights Reserved.
7 # Test mount error cases with overlapping layers
9 # - Same upperdir/lowerdir
10 # - Overlapping upperdir/lowerdir
11 # - Overlapping lowerdir layers
12 # - Overlapping lowerdir with other mount upperdir/workdir
14 # Overlapping layers on mount or lookup results in ELOOP.
15 # Overlapping lowerdir with other mount upperdir/workdir
16 # result in EBUSY (only if index=on is used).
18 # This is a regression test for kernel commit:
20 # 146d62e5a586 "ovl: detect overlapping layers"
22 # and its followup fix commit:
23 # 0be0bfd2de9d "ovl: fix regression caused by overlapping layers detection"
26 seqres=$RESULT_DIR/$seq
27 echo "QA output created by $seq"
31 status=1 # failure is the default!
32 trap "_cleanup; exit \$status" 0 1 2 3 15
38 $UMOUNT_PROG $mnt2 2>/dev/null
41 # get standard environment, filters and checks
45 # remove previous $seqres.full before test
48 # real QA test starts here
50 # Use non-default scratch underlying overlay dirs, we need to check
51 # them explicity after test.
52 _require_scratch_nocheck
53 _require_scratch_feature index
55 # Remove all files from previous tests
58 # Create multiple lowerdirs, upperdirs and workdirs
59 basedir=$OVL_BASE_SCRATCH_MNT
60 lowerdir=$basedir/lower
61 upperdir=$basedir/upper
62 workdir=$basedir/workdir
63 upperdir2=$basedir/upper.2
64 workdir2=$basedir/workdir.2
67 mkdir -p $lowerdir/lower $upperdir $workdir
69 # Try to mount an overlay with the same upperdir/lowerdir - expect ELOOP
70 echo Conflicting upperdir/lowerdir
71 _overlay_scratch_mount_dirs $upperdir $upperdir $workdir \
72 2>&1 | _filter_error_mount
73 $UMOUNT_PROG $SCRATCH_MNT 2>/dev/null
75 # Use new upper/work dirs for each test to avoid ESTALE errors
76 # on mismatch lowerdir/upperdir (see test overlay/037)
77 rm -rf $upperdir $workdir
78 mkdir $upperdir $workdir
80 # Try to mount an overlay with the same workdir/lowerdir - expect ELOOP
81 # because $workdir/work overlaps with lowerdir
82 echo Conflicting workdir/lowerdir
83 _overlay_scratch_mount_dirs $workdir $upperdir $workdir \
84 -oindex=off 2>&1 | _filter_error_mount
85 $UMOUNT_PROG $SCRATCH_MNT 2>/dev/null
87 rm -rf $upperdir $workdir
88 mkdir -p $upperdir/lower $workdir
90 # Try to mount an overlay with overlapping upperdir/lowerdir - expect ELOOP
91 # upperdir inside lowerdir is allowed, lowerdir inside upperdir is not allowed
92 echo Overlapping upperdir/lowerdir
93 _overlay_scratch_mount_dirs $upperdir/lower $upperdir $workdir \
94 2>&1 | _filter_error_mount
95 $UMOUNT_PROG $SCRATCH_MNT 2>/dev/null
97 rm -rf $upperdir $workdir
98 mkdir $upperdir $workdir
100 # Try to mount an overlay with the same lower layers - expect ELOOP
101 echo Conflicting lower layers
102 _overlay_scratch_mount_dirs $lowerdir:$lowerdir $upperdir $workdir \
103 2>&1 | _filter_error_mount
104 $UMOUNT_PROG $SCRATCH_MNT 2>/dev/null
106 rm -rf $upperdir $workdir
107 mkdir $upperdir $workdir
109 # Try to mount an overlay with overlapping lower layers - expect ELOOP
110 echo Overlapping lower layers below
111 _overlay_scratch_mount_dirs $lowerdir:$lowerdir/lower $upperdir $workdir \
112 2>&1 | _filter_error_mount
113 $UMOUNT_PROG $SCRATCH_MNT 2>/dev/null
115 rm -rf $upperdir $workdir
116 mkdir $upperdir $workdir
118 # Try to mount an overlay with overlapping lower layers - expect ELOOP
119 echo Overlapping lower layers above
120 _overlay_scratch_mount_dirs $lowerdir/lower:$lowerdir $upperdir $workdir \
121 2>&1 | _filter_error_mount
122 $UMOUNT_PROG $SCRATCH_MNT 2>/dev/null
124 rm -rf $upperdir $workdir
125 mkdir -p $upperdir/upper $workdir $mnt2
127 # Mount overlay with non overlapping lowerdir, upperdir, workdir -
129 _overlay_mount_dirs $lowerdir $upperdir $workdir overlay $mnt2
131 rm -rf $upperdir2 $workdir2
132 mkdir -p $upperdir2 $workdir2 $mnt2
134 # Try to mount an overlay with layers overlapping with another overlayfs
135 # upperdir - expect EBUSY with index=on and success with index=off
136 echo "Overlapping with upperdir of another instance (index=on)"
137 _overlay_scratch_mount_dirs $upperdir/upper $upperdir2 $workdir2 \
138 -oindex=on 2>&1 | _filter_busy_mount
139 $UMOUNT_PROG $SCRATCH_MNT 2>/dev/null
141 rm -rf $upperdir2 $workdir2
142 mkdir -p $upperdir2 $workdir2
144 echo "Overlapping with upperdir of another instance (index=off)"
145 _overlay_scratch_mount_dirs $upperdir/upper $upperdir2 $workdir2 \
146 -oindex=off && $UMOUNT_PROG $SCRATCH_MNT
148 rm -rf $upperdir2 $workdir2
149 mkdir -p $upperdir2 $workdir2
151 # Try to mount an overlay with layers overlapping with another overlayfs
152 # workdir - expect EBUSY with index=on and success with index=off
153 echo "Overlapping with workdir of another instance (index=on)"
154 _overlay_scratch_mount_dirs $workdir/work $upperdir2 $workdir2 \
155 -oindex=on 2>&1 | _filter_busy_mount
156 $UMOUNT_PROG $SCRATCH_MNT 2>/dev/null
158 rm -rf $upperdir2 $workdir2
159 mkdir -p $upperdir2 $workdir2
161 echo "Overlapping with workdir of another instance (index=off)"
162 _overlay_scratch_mount_dirs $workdir/work $upperdir2 $workdir2 \
163 -oindex=off && $UMOUNT_PROG $SCRATCH_MNT
165 # Move upper layer root into lower layer after mount
166 echo Overlapping upperdir/lowerdir after mount
167 mv $upperdir $lowerdir/
168 # Lookup files in overlay mount with overlapping layers -
169 # expect ELOOP when upper layer root is found in lower layer
170 find $mnt2/upper 2>&1 | _filter_scratch