generic: test that linking into a directory fails with EDQUOT

Add a regression test to make sure that unprivileged userspace linking
into a directory fails with EDQUOT when the directory quota limits have
been exceeded.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

diff --git a/tests/generic/681 b/tests/generic/681
new file mode 100755 (executable)
index 0000000..2baae9f
--- /dev/null
+++ b/tests/generic/681
@@ -0,0 +1,67 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 Oracle.  All Rights Reserved.
+#
+# FS QA Test No. 681
+#
+# Ensure that unprivileged userspace hits EDQUOT while linking files into a
+# directory when the directory's quota limits have been exceeded.
+#
+# Regression test for commit:
+#
+# 871b9316e7a7 ("xfs: reserve quota for dir expansion when linking/unlinking files")
+#
+. ./common/preamble
+_begin_fstest auto quick quota
+
+# Import common functions.
+. ./common/filter
+. ./common/quota
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_require_quota
+_require_user
+_require_scratch
+
+_scratch_mkfs > "$seqres.full" 2>&1
+_qmount_option usrquota
+_qmount
+
+blocksize=$(_get_block_size $SCRATCH_MNT)
+scratchdir=$SCRATCH_MNT/dir
+scratchfile=$SCRATCH_MNT/file
+mkdir $scratchdir
+touch $scratchfile
+
+# Create a 2-block directory for our 1-block quota limit
+total_size=$((blocksize * 2))
+dirents=$((total_size / 255))
+
+for ((i = 0; i < dirents; i++)); do
+       name=$(printf "x%0254d" $i)
+       ln $scratchfile $scratchdir/$name
+done
+
+# Set a low quota hardlimit for an unprivileged uid and chown the files to it
+echo "set up quota" >> $seqres.full
+setquota -u $qa_user 0 "$((blocksize / 1024))" 0 0 $SCRATCH_MNT
+chown $qa_user $scratchdir $scratchfile
+repquota -upn $SCRATCH_MNT >> $seqres.full
+
+# Fail at appending the directory as qa_user to ensure quota enforcement works
+echo "fail quota" >> $seqres.full
+for ((i = 0; i < dirents; i++)); do
+       name=$(printf "y%0254d" $i)
+       su - "$qa_user" -c "ln $scratchfile $scratchdir/$name" 2>&1 | \
+               _filter_scratch | sed -e 's/y[0-9]*/yXXX/g'
+       test "${PIPESTATUS[0]}" -ne 0 && break
+done
+repquota -upn $SCRATCH_MNT >> $seqres.full
+
+# success, all done
+echo Silence is golden
+status=0
+exit

diff --git a/tests/generic/681.out b/tests/generic/681.out
new file mode 100644 (file)
index 0000000..dd7e1b0
--- /dev/null
+++ b/tests/generic/681.out
@@ -0,0 +1,3 @@
+QA output created by 681
+ln: failed to create hard link 'SCRATCH_MNT/dir/yXXX': Disk quota exceeded
+Silence is golden