xfs: Check for extent overflow when adding/removing xattrs

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

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>

tests/xfs/532

@@ -0,0 +1,139 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2021 Chandan Babu R.  All Rights Reserved.
+#
+# FS QA Test 532
+#
+# 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
+. ./common/populate
+
+# 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"
+
+echo "Format and mount fs"
+_scratch_mkfs_sized $((1024 * 1024 * 1024)) >> $seqres.full
+_scratch_mount >> $seqres.full
+
+bsize=$(_get_block_size $SCRATCH_MNT)
+
+attr_len=255
+
+testfile=$SCRATCH_MNT/testfile
+
+echo "Consume free space"
+fillerdir=$SCRATCH_MNT/fillerdir
+nr_free_blks=$(stat -f -c '%f' $SCRATCH_MNT)
+nr_free_blks=$((nr_free_blks * 90 / 100))
+
+_fill_fs $((bsize * nr_free_blks)) $fillerdir $bsize 0 >> $seqres.full 2>&1
+
+echo "Create fragmented filesystem"
+for dentry in $(ls -1 $fillerdir/); do
+	$here/src/punch-alternating $fillerdir/$dentry >> $seqres.full
+done
+
+echo "Inject reduce_max_iextents error tag"
+_scratch_inject_error reduce_max_iextents 1
+
+echo "Inject bmap_alloc_minlen_extent error tag"
+_scratch_inject_error bmap_alloc_minlen_extent 1
+
+echo "* Set xattrs"
+
+echo "Create \$testfile"
+touch $testfile
+
+echo "Create xattrs"
+nr_attrs=$((bsize * 20 / attr_len))
+for i in $(seq 1 $nr_attrs); do
+	attr="$(printf "trusted.%0247d" $i)"
+	$SETFATTR_PROG -n "$attr" $testfile >> $seqres.full 2>&1
+	[[ $? != 0 ]] && break
+done
+
+echo "Verify \$testfile's naextent count"
+
+naextents=$(_xfs_get_fsxattr naextents $testfile)
+if (( $naextents > 10 )); then
+	echo "Extent count overflow check failed: naextents = $naextents"
+	exit 1
+fi
+
+echo "Remove \$testfile"
+rm $testfile
+
+echo "* Remove xattrs"
+
+echo "Create \$testfile"
+touch $testfile
+
+echo "Disable reduce_max_iextents error tag"
+_scratch_inject_error reduce_max_iextents 0
+
+echo "Create initial xattr extents"
+
+naextents=0
+last=""
+start=1
+nr_attrs=$((bsize / attr_len))
+
+while (( $naextents < 4 )); do
+	end=$((start + nr_attrs - 1))
+
+	for i in $(seq $start $end); do
+		attr="$(printf "trusted.%0247d" $i)"
+		$SETFATTR_PROG -n $attr $testfile
+	done
+
+	start=$((end + 1))
+
+	naextents=$(_xfs_get_fsxattr naextents $testfile)
+done
+
+echo "Inject reduce_max_iextents error tag"
+_scratch_inject_error reduce_max_iextents 1
+
+echo "Remove xattr to trigger -EFBIG"
+attr="$(printf "trusted.%0247d" 1)"
+$SETFATTR_PROG -x "$attr" $testfile >> $seqres.full 2>&1
+if [[ $? == 0 ]]; then
+	echo "Xattr removal succeeded; Should have failed "
+	exit 1
+fi
+
+rm $testfile && echo "Successfully removed \$testfile"
+
+# success, all done
+status=0
+exit

tests/xfs/532.out

@@ -0,0 +1,18 @@
+QA output created by 532
+Format and mount fs
+Consume free space
+Create fragmented filesystem
+Inject reduce_max_iextents error tag
+Inject bmap_alloc_minlen_extent error tag
+* Set xattrs
+Create $testfile
+Create xattrs
+Verify $testfile's naextent count
+Remove $testfile
+* Remove xattrs
+Create $testfile
+Disable reduce_max_iextents error tag
+Create initial xattr extents
+Inject reduce_max_iextents error tag
+Remove xattr to trigger -EFBIG
+Successfully removed $testfile

tests/xfs/group

@@ -508,3 +508,4 @@
 529 auto quick quota
 530 auto quick realtime growfs
 531 auto quick punch zero insert collapse
+532 auto quick attr