Tests the search algorithm for a free inode slot in a specific AG, done
in xfs_dialloc_ag_inobt().
When finobt is not used, and agi->freecount is not 0, XFS will scan the AG inode
tree looking for a free inode slot, but if agi->freecount is corrupted,
and there is no free slot at all, it will end up in an infinite loop.
This test checks for the infinite loop fix.
Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
---
Changelog:
V2:
- Small clean up
- use _disable_dmesg_check (the test will generate error
messages which will appear in dmesg)
- Get the amount of free inodes from the AGI instead of assuming
61 free inodes
- Send a few outputs to $seqres.full
- Use xfs_db `write` without -d option once this will create
incompatibility with previous xfsprogs, and is not strictly
required for the test to work.
- Check for finobt, and explicitly disable it if it is
supported by the kernel being tested.
tests/xfs/057 | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
tests/xfs/057.out | 2 ++
tests/xfs/group | 1 +
3 files changed, 89 insertions(+)
create mode 100755 tests/xfs/057
create mode 100644 tests/xfs/057.out
diff --git a/tests/xfs/057 b/tests/xfs/057
new file mode 100755
index 00000000..9833ba25
--- /dev/null
+++ b/tests/xfs/057
@@ -0,0 +1,86 @@
+#! /bin/bash
+# FS QA Test 057
+#
+# Check if the filesystem will lockup when trying to allocate a new inode in
+# an AG with no free inodes but with a corrupted agi->freecount showing free inodes.
+#
+# At the end of the test, the scratch device will purposely be in a corrupted
+# state, so there is no need for checking that.
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 Red Hat, Inc. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+#-----------------------------------------------------------------------
+#
+
+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 generic
+_supported_os Linux
+_require_scratch_nocheck
+_disable_dmesg_check
+
+# Make sure we disable finobt if the filesystem supports it, otherwise, just
+# initialize it with default options.
+_scratch_mkfs | grep -q "finobt=1" && _scratch_mkfs -m "finobt=0" >/dev/null 2>&1
+
+# Get the amount of free inodes from the AGI 0, so we can fill up the freecount
+# structure.
+freecount=`_scratch_xfs_db -c "agi 0" -c "p freecount" | cut -d' ' -f 3`
+
+_scratch_mount
+
+# At the end of filesystem's initialization, AG 0 will have $freecount free
+# inodes in the agi->freecount, create $freecount extra dummy files to fill it.
+for i in `seq 1 $freecount`; do
+ touch $SCRATCH_MNT/dummy_file$i
+done
+
+_scratch_unmount >/dev/null 2>&1
+
+# agi->freecount is 0 here, corrupt it to show extra free inodes
+$XFS_DB_PROG -x -c "agi 0" -c "write freecount 10" $SCRATCH_DEV >> $seqres.full 2>&1
+
+_scratch_mount
+
+# Lock up a buggy kernel
+touch $SCRATCH_MNT/lockupfile >> $seqres.full 2>&1
+
+# If we reach this point, the filesystem is fixed
+echo "Silence is golden"
+status=0
+exit
diff --git a/tests/xfs/057.out b/tests/xfs/057.out
new file mode 100644
index 00000000..185023c7
--- /dev/null
+++ b/tests/xfs/057.out
@@ -0,0 +1,2 @@
+QA output created by 057
+Silence is golden
diff --git a/tests/xfs/group b/tests/xfs/group
index cf876a29..37e4e641 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -54,6 +54,7 @@
054 auto quick
055 dump ioctl remote tape
056 dump ioctl auto quick
+057 auto quick fuzzers dangerous
059 dump ioctl auto quick
060 dump ioctl auto quick
061 dump ioctl auto quick
--
2.13.5
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