mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Dave Chinner
0c1a95d067
Fully scripted conversion, see script in initial SPDX license commit message. Signed-off-by: Dave Chinner <dchinner@redhat.com>
99 lines
2.6 KiB
Bash
Executable File
99 lines
2.6 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2017 CTERA Networks. All Rights Reserved.
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#
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# FS QA Test 034
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#
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# Test overlay nlink when adding lower hardlinks.
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#
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# nlink of overlay inode could be dropped indefinitely by adding
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# unaccounted lower hardlinks underneath a mounted overlay and
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# trying to remove them.
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#
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# The simplest way to understand this test is this:
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# Imagine that you have a tool (e.g. xfs_db) with which you can add
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# hardlinks, without changing the value of nlink stored on-disk for the
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# inode. This is exactly what this test does when it adds lower hardlinks
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# underneath a mounted overlay.
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#
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# Commit 5f8415d6b87e ("ovl: persistent overlay inode nlink for indexed
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# inodes") fixes this issue, although the issue was never exposed in any
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# released kernel.
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#
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# With overlayfs indexed copy up and without the fix, the test triggers
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# WARN_ON(inode->i_nlink == 0) in drop_link().
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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cd /
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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_supported_fs overlay
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_supported_os Linux
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_require_scratch
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# Without overlay index feature hardlinks are broken on copy up
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_require_scratch_feature index
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lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
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workdir=$OVL_BASE_SCRATCH_MNT/$OVL_WORK
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# Remove all files from previous tests
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_scratch_mkfs
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# Create lower hardlink
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mkdir -p $lowerdir
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touch $lowerdir/0
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ln $lowerdir/0 $lowerdir/1
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# Enable overlay index feature to prevent breaking hardlinks on copy up
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_scratch_mount -o index=on
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# Copy up lower hardlink - overlay inode nlink 2 is copied from lower
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touch $SCRATCH_MNT/0
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# Add lower hardlinks while overlay is mounted - overlay inode nlink
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# is not being updated
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ln $lowerdir/0 $lowerdir/2
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ln $lowerdir/0 $lowerdir/3
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# Unlink the 2 un-accounted lower hardlinks - overlay inode nlinks
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# drops 2 and may reach 0 if the situation is not detected
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rm $SCRATCH_MNT/2
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rm $SCRATCH_MNT/3
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# Check if getting ENOENT when trying to link !I_LINKABLE with nlink 0
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ln $SCRATCH_MNT/0 $SCRATCH_MNT/4
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# Unlink all hardlinks - if overlay inode nlink is 0, this will trigger
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# WARN_ON() in drop_nlink()
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rm $SCRATCH_MNT/0
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rm $SCRATCH_MNT/1
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rm $SCRATCH_MNT/4
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# Verify that orphan index is cleaned on mount
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_scratch_cycle_mount index=on
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# With nfs_export=on index will contain a whiteout index entry, so allow
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# chardev entries in index dir.
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find $workdir/index -mindepth 1 -type c -o -print
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echo "Silence is golden"
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status=0
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exit
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