[PATCH 05/11] xfs: Check for extent overflow when adding/removing xattrs

[Chandan Babu R <chandanrlinux@gmail.com>]

This test verifies that XFS does not cause inode fork's extent count to
overflow when adding/removing xattrs.

Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
---
 tests/xfs/525     | 154 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/525.out |  16 +++++
 tests/xfs/group   |   1 +
 3 files changed, 171 insertions(+)
 create mode 100755 tests/xfs/525
 create mode 100644 tests/xfs/525.out

diff --git a/tests/xfs/525 b/tests/xfs/525
new file mode 100755
index 00000000..1d5d6e7c
--- /dev/null
+++ b/tests/xfs/525
@@ -0,0 +1,154 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2020 Chandan Babu R.  All Rights Reserved.
+#
+# FS QA Test 525
+#
+# Verify that XFS does not cause inode fork's extent count to overflow when
+# Adding/removing xattrs.
+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
+. ./common/attr
+. ./common/inject
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+_supported_fs xfs
+_require_scratch
+_require_attrs
+_require_xfs_debug
+_require_test_program "punch-alternating"
+_require_xfs_io_error_injection "reduce_max_iextents"
+_require_xfs_io_error_injection "bmap_alloc_minlen_extent"
+
+attr_set()
+{
+	echo "* Set xattrs"
+
+	echo "Format and mount fs"
+	_scratch_mkfs_sized $((1024 * 1024 * 1024)) >> $seqres.full
+	_scratch_mount >> $seqres.full
+
+	bsize=$(_get_block_size $SCRATCH_MNT)
+
+	testfile=$SCRATCH_MNT/testfile
+
+	echo "Consume free space"
+	dd if=/dev/zero of=${testfile} bs=${bsize} >> $seqres.full 2>&1
+	sync
+
+	echo "Create fragmented filesystem"
+	$here/src/punch-alternating $testfile >> $seqres.full
+	sync
+
+	echo "Inject reduce_max_iextents error tag"
+	xfs_io -x -c 'inject reduce_max_iextents' $SCRATCH_MNT
+
+	echo "Inject bmap_alloc_minlen_extent error tag"
+	xfs_io -x -c 'inject bmap_alloc_minlen_extent' $SCRATCH_MNT
+
+	echo "Create xattrs"
+
+	attr_len=$(uuidgen | wc -c)
+	nr_attrs=$((bsize * 20 / attr_len))
+	for i in $(seq 1 $nr_attrs); do
+		$SETFATTR_PROG -n "trusted.""$(uuidgen)" $testfile \
+			 >> $seqres.full 2>&1
+		[[ $? != 0 ]] && break
+	done
+
+	testino=$(stat -c "%i" $testfile)
+
+	_scratch_unmount >> $seqres.full
+
+	echo "Verify uquota inode's extent count"
+
+	nextents=$(_scratch_get_iext_count $testino attr || \
+			_fail "Unable to obtain inode fork's extent count")
+	if (( $nextents > 10 )); then
+		echo "Extent count overflow check failed: nextents = $nextents"
+		exit 1
+	fi
+}
+
+attr_remove()
+{
+	echo "* Remove xattrs"
+
+	echo "Format and mount fs"
+	_scratch_mkfs_sized $((1024 * 1024 * 1024)) >> $seqres.full
+	_scratch_mount >> $seqres.full
+
+	bsize=$(_get_block_size $SCRATCH_MNT)
+
+	testfile=$SCRATCH_MNT/testfile
+
+	echo "Consume free space"
+	dd if=/dev/zero of=${testfile} bs=${bsize} >> $seqres.full 2>&1
+	sync
+
+	echo "Create fragmented filesystem"
+	$here/src/punch-alternating $testfile >> $seqres.full
+	sync
+
+	testino=$(stat -c "%i" $testfile)
+
+	naextents=0
+	last=""
+
+	attr_len=$(uuidgen | wc -c)
+	nr_attrs=$((bsize / attr_len))
+
+	echo "Create initial xattr extents"
+	while (( $naextents < 4 )); do
+		xfs_io -x -c 'inject bmap_alloc_minlen_extent' $SCRATCH_MNT
+
+		for i in $(seq 1 $nr_attrs); do
+			last="trusted.""$(uuidgen)"
+			$SETFATTR_PROG -n $last $testfile
+		done
+
+		_scratch_unmount >> $seqres.full
+
+		naextents=$(_scratch_get_iext_count $testino attr || \
+				_fail "Unable to obtain inode fork's extent count")
+
+		_scratch_mount >> $seqres.full
+	done
+
+	echo "Inject reduce_max_iextents error tag"
+	xfs_io -x -c 'inject reduce_max_iextents' $SCRATCH_MNT
+
+	echo "Remove xattr to trigger -EFBIG"
+	$SETFATTR_PROG -x "$last" $testfile >> $seqres.full 2>&1
+	if [[ $? == 0 ]]; then
+		echo "Xattr removal succeeded; Should have failed "
+		exit 1
+	fi
+}
+
+attr_set
+attr_remove
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/525.out b/tests/xfs/525.out
new file mode 100644
index 00000000..cc40e6e2
--- /dev/null
+++ b/tests/xfs/525.out
@@ -0,0 +1,16 @@
+QA output created by 525
+* Set xattrs
+Format and mount fs
+Consume free space
+Create fragmented filesystem
+Inject reduce_max_iextents error tag
+Inject bmap_alloc_minlen_extent error tag
+Create xattrs
+Verify uquota inode's extent count
+* Remove xattrs
+Format and mount fs
+Consume free space
+Create fragmented filesystem
+Create initial xattr extents
+Inject reduce_max_iextents error tag
+Remove xattr to trigger -EFBIG
diff --git a/tests/xfs/group b/tests/xfs/group
index 3fa38c36..bd38aff0 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -522,3 +522,4 @@
 522 auto quick quota
 523 auto quick realtime growfs
 524 auto quick punch zero insert collapse
+525 auto quick attr
-- 
2.28.0