[PATCH v3] xfs: test inode allocation state missmatch corruption

[Zorro Lang <zlang@redhat.com>]

There's a situation where the directory structure and the inobt
thinks the inode is free, but the inode on disk thinks it is still
in use. XFS should detect it and prevent the kernel from oopsing
on lookup.

Signed-off-by: Zorro Lang <zlang@redhat.com>
---

Hi,

Old V2: https://marc.info/?l=fstests&m=152605509711179&w=2

V3 did below changes:
1) Update description
2) Change function name _filter_dmesg to filter_dmesg
3) Add _require_xfs_mkfs_crc

Thanks,
Zorro

 tests/xfs/999     | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/999.out |   2 ++
 tests/xfs/group   |   1 +
 3 files changed, 107 insertions(+)
 create mode 100755 tests/xfs/999
 create mode 100644 tests/xfs/999.out

diff --git a/tests/xfs/999 b/tests/xfs/999
new file mode 100755
index 00000000..6057c3b7
--- /dev/null
+++ b/tests/xfs/999
@@ -0,0 +1,104 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2018 Red Hat Inc.  All Rights Reserved.
+#
+# FS QA Test No. 999
+#
+# Test a corruption when the directory structure and the inobt thinks the inode
+# is free, but the inode on disk thinks it is still in use.
+#
+# This case test same bug (upstream linux commit ee457001ed6c) as xfs/132, but
+# through different code path.
+#
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs xfs
+_supported_os Linux
+_require_scratch_nocheck
+_require_no_xfs_bug_on_assert
+# need mkfs crc=0 below
+_require_xfs_mkfs_crc
+
+filter_dmesg()
+{
+	local warn1="Internal error xfs_trans_cancel.*fs/xfs/xfs_trans\.c.*"
+	local warn2="WARNING:.*fs/xfs/xfs_message\.c:.*assfail.*"
+
+	sed -e "s#$warn1#Intentional error in xfs_trans_cancel#" \
+	    -e "s#$warn2#Intentional warnings in assfail#"
+}
+
+# Use crc=0, due to this crash is only possible on v4 XFS or v5 XFS mounted
+# with the ikeep mount option. For all other V5 XFS, this problem cannot
+# occur because we don't read inodes we are allocating from disk - we simply
+# overwrite them with the new inode information.
+_scratch_mkfs_xfs -m crc=0 >> $seqres.full 2>&1
+blksz=$(_scratch_xfs_get_sb_field blocksize)
+agcount=$(_scratch_xfs_get_sb_field agcount)
+
+_scratch_mount
+# Create a directory for later allocation in same AG (AG 0, due to this's an
+# empty XFS for now)
+mkdir $SCRATCH_MNT/dir
+
+# Allocate 1 block for testfile
+$XFS_IO_PROG -fc "pwrite 0 $blksz" -c fsync $SCRATCH_MNT/dir/testfile >> $seqres.full
+inum=`stat -c %i $SCRATCH_MNT/dir/testfile`
+_scratch_unmount
+
+# Find the AG which contains testfile
+agi=`_scratch_xfs_db -c "convert inode $inum agno" | sed -e 's/^.*(\([0-9]*\).*$/\1/g'`
+
+# Due to we only allocate 1 block for testfile, and this's the only one data
+# block we use. So we use single level inobt, So the ${agi}->root->recs[1]
+# should be the only one record points the chunk which contains testfile's
+# inode.
+# An exmaple of inode record is as below:
+#   recs[1] = [startino,freecount,free] 1:[1024,59,0xffffffffffffffe0]
+freecount=$(_scratch_xfs_get_metadata_field "recs[1].freecount" \
+					    "agi $agi" "addr root")
+fmask=$(_scratch_xfs_get_metadata_field "recs[1].free" "agi $agi" "addr root")
+
+# fmask shift right 1 bit, and freecount++, to mark testfile inode as free in
+# inobt. (But the inode itself isn't freed, it still has allocated block)
+freecount="$((freecount + 1))"
+fmask="$((fmask / 2))"
+_scratch_xfs_set_metadata_field "recs[1].freecount" "$freecount" \
+				"agi $agi" "addr root" >/dev/null
+_scratch_xfs_set_metadata_field "recs[1].free" "$fmask" \
+				"agi $agi" "addr root" >/dev/null
+
+# Mount again and create a new inode cover that inode we just 'freed' from inobt
+_scratch_mount
+$XFS_IO_PROG -fc "pwrite 0 $blksz" -c fsync $SCRATCH_MNT/dir/newfile 2>&1 | \
+	grep -i "Structure needs cleaning" | _filter_scratch
+
+# filter a intentional internal errors
+_check_dmesg filter_dmesg
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/999.out b/tests/xfs/999.out
new file mode 100644
index 00000000..cb8d9e34
--- /dev/null
+++ b/tests/xfs/999.out
@@ -0,0 +1,2 @@
+QA output created by 999
+SCRATCH_MNT/dir/newfile: Structure needs cleaning
diff --git a/tests/xfs/group b/tests/xfs/group
index 932ab909..4bea7b2b 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -447,3 +447,4 @@
 447 auto mount
 448 auto quick fuzzers
 449 auto quick
+999 auto quick
-- 
2.14.4