mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Darrick J. Wong
a860a167d8
fstests only supports Linux, so get rid of this unnecessary predicate. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
138 lines
3.6 KiB
Bash
Executable File
138 lines
3.6 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2017 IBM Corporation. All Rights Reserved.
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#
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# FSQA Test No. 044
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#
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# Test hardlink breakage on non-samefs setup
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# This is a variant of overlay/018 to test.
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#
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# This simple test demonstrates a known issue with overlayfs:
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# - file A and B are hardlinked in lower
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# - modify A to trigger copy up
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# - file A is no longer a hardlink of file B
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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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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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# real QA test starts here
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_supported_fs overlay
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# Use non-default scratch underlying overlay dirs, we need to check
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# them explicity after test.
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_require_scratch_nocheck
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_require_test
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_require_scratch_feature index
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_require_test_program "t_dir_type"
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rm -f $seqres.full
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# Record inode numbers in format <ino> <nlink>
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function record_ino_nlink()
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{
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ls -li $FILES | awk '{ print $1, $3, $10}' > $1
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}
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# Check inode numbers match recorded inode numbers
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function check_ino_nlink()
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{
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dir=$1
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before=$2
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after=$3
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record_ino_nlink $after
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# Test constant stat(2) st_ino/st_nlink -
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# Compare before..after - expect silence
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# We use diff -u so out.bad will tell us which stage failed
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diff -u $before $after
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# Test constant readdir(3)/getdents(2) d_ino -
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# Expect to find file by inode number
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cat $before | while read ino nlink f; do
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$here/src/t_dir_type $dir $ino | grep -q $(basename $f) || \
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echo "$(basename $f) not found by ino $ino (from $before)"
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done
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}
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lowerdir=$OVL_BASE_TEST_DIR/$seq-ovl-lower
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rm -rf $lowerdir
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mkdir $lowerdir
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# Create 2 hardlinked files in lower
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echo "zero" >> $lowerdir/foo
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ln $lowerdir/foo $lowerdir/bar
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_scratch_mkfs >>$seqres.full 2>&1
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upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
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workdir=$OVL_BASE_SCRATCH_MNT/$OVL_WORK
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# Enable overlay index feature to prevent breaking hardlinks on copy up.
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# Enabling xino in this test requires that base filesystem inode numbers will
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# not use bit 63 in inode number of the test files, because bit 63 is used by
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# overlayfs to indicate the layer. Let's just assume that this is true for all
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# tested filesystems and if we are wrong, the test may fail.
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_overlay_scratch_mount_dirs $lowerdir $upperdir $workdir -o index=on,xino=on || \
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_notrun "cannot mount overlay with xino=on option"
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_fs_options $SCRATCH_DEV | grep -q "xino=on" || \
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_notrun "cannot enable xino feature"
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rm -f $tmp.*
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foo=$SCRATCH_MNT/foo
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bar=$SCRATCH_MNT/bar
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FILES="$foo $bar"
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echo "== Before copy up =="
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cat $FILES
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record_ino_nlink $tmp.before
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# Modify content of one of the hardlinks
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# Intentionally modify the last hardlink in $FILES, so after mount cycle
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# when reading the first file in $FILES, last file won't be in inode/dcache
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echo "one" >> $bar
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echo "== After write one =="
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cat $FILES
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check_ino_nlink $SCRATCH_MNT $tmp.before $tmp.after_one
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# Verify that the hardlinks survive a mount cycle
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$UMOUNT_PROG $SCRATCH_MNT
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_overlay_check_scratch_dirs $lowerdir $upperdir $workdir -o index=on,xino=on
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_overlay_scratch_mount_dirs $lowerdir $upperdir $workdir -o index=on,xino=on
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echo "== After mount cycle =="
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cat $FILES
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check_ino_nlink $SCRATCH_MNT $tmp.after_one $tmp.after_cycle
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# Drop caches to get the copied up hardlink out of cache
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echo 3 > /proc/sys/vm/drop_caches
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# Modify content of the other hardlink
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echo "two" >> $foo
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echo "== After write two =="
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cat $FILES
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check_ino_nlink $SCRATCH_MNT $tmp.after_one $tmp.after_two
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# check overlayfs
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_overlay_check_scratch_dirs $lowerdir $upperdir $workdir -o index=on
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status=0
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exit
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