[PATCH] fstests: new helper to skip xfs_check

[Zorro Lang <zlang@redhat.com>]

The _xfs_check sometimes need to take too much memory, some quota
related cases (e.g: xfs/442, generic/232 etc) always trigger OOM
killer.

  [93334.020194] xfs_db invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null), order=0, oom_score_adj=-1000
  [93334.020206] xfs_db cpuset=/ mems_allowed=0
  [93334.020213] CPU: 2 PID: 977 Comm: xfs_db Kdump: loaded Not tainted 4.18.0-139.el8.ppc64le+debug #1
  [93334.020217] Call Trace:
  [93334.020223] [c0000001cb163640] [c000000001035754] dump_stack+0xe8/0x164 (unreliable)
  [93334.020229] [c0000001cb163690] [c0000000004a77dc] dump_header+0x7c/0x670
  [93334.020234] [c0000001cb1637b0] [c0000000004a872c] oom_kill_process+0x26c/0x3d0
  [93334.020239] [c0000001cb163800] [c0000000004aa438] out_of_memory+0x278/0x930
  [93334.020244] [c0000001cb1638a0] [c0000000004bd6c8] __alloc_pages_nodemask+0x1ab8/0x1b70
  [93334.020248] [c0000001cb163ae0] [c00000000058b8dc] alloc_pages_vma+0xec/0x660
  [93334.020253] [c0000001cb163b50] [c00000000052b544] do_anonymous_page+0x124/0xac0
  [93334.020258] [c0000001cb163bc0] [c000000000534918] __handle_mm_fault+0xda8/0x1b60
  [93334.020263] [c0000001cb163cb0] [c000000000535948] handle_mm_fault+0x278/0x5a0
  [93334.020268] [c0000001cb163d00] [c00000000008b30c] __do_page_fault+0x27c/0xe00
  [93334.020273] [c0000001cb163df0] [c00000000008bec8] do_page_fault+0x38/0xf0
  [93334.020278] [c0000001cb163e30] [c00000000000a904] handle_page_fault+0x18/0x38
  [93334.020281] Mem-Info:
  [93334.020286] active_anon:93769 inactive_anon:13540 isolated_anon:0
  [93334.020286]  active_file:23 inactive_file:8 isolated_file:0
  [93334.020286]  unevictable:0 dirty:0 writeback:0 unstable:0
  [93334.020286]  slab_reclaimable:1543 slab_unreclaimable:8926
  [93334.020286]  mapped:69 shmem:15 pagetables:76 bounce:0
  [93334.020286]  free:2756 free_pcp:0 free_cma:0

The xfs_check related code is old, and nearly won't be maintained
too much, test xfs_repair and xfs_scrub is much more important than
xfs_check. But the xfstests always do a POST-xfs_check at the end of
each cases. So I'd like to add a new helper named
_require_scratch_no_xfs_check to skip xfs_check from some sub-cases.

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

Hi,

Maybe this patch not the best way to deal with this issue. Please feel free to
tell me if you have better idea.

Thanks,
Zorro

 common/rc         |  1 +
 common/xfs        | 26 ++++++++++++++++++++++++++
 tests/generic/232 |  2 ++
 tests/generic/233 |  2 ++
 tests/generic/234 |  2 ++
 tests/xfs/442     |  2 ++
 6 files changed, 35 insertions(+)

diff --git a/common/rc b/common/rc
index e0b087c1..86eeda16 100644
--- a/common/rc
+++ b/common/rc
@@ -1570,6 +1570,7 @@ _require_scratch()
 {
 	_require_scratch_nocheck
 	touch ${RESULT_DIR}/require_scratch
+	touch ${RESULT_DIR}/require_scratch.xfs_check
 }
 
 # require a scratch dev of a minimum size (in kb)
diff --git a/common/xfs b/common/xfs
index 1bce3c18..80e6d1e8 100644
--- a/common/xfs
+++ b/common/xfs
@@ -168,11 +168,37 @@ _scratch_mkfs_xfs()
 	return $mkfs_status
 }
 
+# Usage: _require_scratch_no_xfs_check [limit_memsize]
+#
+# Due to xfs_check costs too much memory, sometimes it cause OOM when test on
+# low memory machine. This function is used to skip xfs_check conditionally
+# or unconditionally.
+#
+# Note: must be called after _require_scratch.
+_require_scratch_no_xfs_check()
+{
+	local bound=$1
+	local freemem
+
+	freemem=`_free_memory_bytes`
+	if [ -n "$bound" ];then
+		if [ $freemem -lt $bound ];then
+			rm -f ${RESULT_DIR}/require_scratch.xfs_check
+		fi
+	else
+		rm -f ${RESULT_DIR}/require_scratch.xfs_check
+	fi
+}
+
 # xfs_check script is planned to be deprecated. But, we want to
 # be able to invoke "xfs_check" behavior in xfstests in order to
 # maintain the current verification levels.
 _xfs_check()
 {
+	if [ ! -f "${RESULT_DIR}/require_scratch.xfs_check" ];then
+		return 0
+	fi
+
 	OPTS=" "
 	DBOPTS=" "
 	USAGE="Usage: xfs_check [-fsvV] [-l logdev] [-i ino]... [-b bno]... special"
diff --git a/tests/generic/232 b/tests/generic/232
index d5c20249..20841313 100755
--- a/tests/generic/232
+++ b/tests/generic/232
@@ -52,6 +52,8 @@ _fsstress()
 _supported_fs generic
 _supported_os Linux
 _require_scratch
+# Do post xfs_check, if free memory size > 16G
+_require_scratch_no_xfs_check $((16 * 1024 * 1024 * 1024))
 _require_quota
 
 _scratch_mkfs > $seqres.full 2>&1
diff --git a/tests/generic/233 b/tests/generic/233
index c49bf252..7933d4b8 100755
--- a/tests/generic/233
+++ b/tests/generic/233
@@ -56,6 +56,8 @@ _fsstress()
 _supported_fs generic
 _supported_os Linux
 _require_scratch
+# Do post xfs_check, if free memory size > 16G
+_require_scratch_no_xfs_check $((16 * 1024 * 1024 * 1024))
 _require_quota
 _require_user
 
diff --git a/tests/generic/234 b/tests/generic/234
index dc296df8..e843dc10 100755
--- a/tests/generic/234
+++ b/tests/generic/234
@@ -72,6 +72,8 @@ test_setting()
 _supported_fs generic
 _supported_os Linux
 _require_scratch
+# Do post xfs_check, if free memory size > 16G
+_require_scratch_no_xfs_check $((16 * 1024 * 1024 * 1024))
 _require_quota
 
 # real QA test starts here
diff --git a/tests/xfs/442 b/tests/xfs/442
index 7a5f2e8e..9e891b51 100755
--- a/tests/xfs/442
+++ b/tests/xfs/442
@@ -36,6 +36,8 @@ _supported_fs xfs
 _supported_os Linux
 
 _require_scratch_reflink
+# Do post xfs_check, if free memory size > 16G
+_require_scratch_no_xfs_check $((16 * 1024 * 1024 * 1024))
 _require_quota
 _require_command "$KILLALL_PROG" "killall"
 
-- 
2.17.2