[PATCH v3 2/3] xfs/realtime: Default rtinherit=1, add _require_no_rtinherit function

[Richard Wareing <rwareing@fb.com>]

To better exercise the data path code of realtime subvolumes, we will
set rtinherit=1 during mkfs calls.  For tests which this is not desired
we introduce a _require_no_rtinherit function to opt out of this
behavior.

Signed-off-by: Richard Wareing <rwareing@fb.com>
---
Changes since v2:
* Removed use of RT_INHERT, instead we now simply bail from the test.  Users
  will have to create two separate configs for realtime one with rtinherit=1
  in the mkfs options, one without and do separate runs to get full test
  coverage.
* Added comments explaining reasons for _require_no_rtinherit declarations

Changes since v1:
* None

 common/rc         | 11 +++++++++++
 tests/generic/250 |  3 +++
 tests/generic/252 |  3 +++
 tests/generic/441 |  3 +++
 tests/xfs/170     |  1 +
 5 files changed, 21 insertions(+)

diff --git a/common/rc b/common/rc
index f5fe739..1720a72 100644
--- a/common/rc
+++ b/common/rc
@@ -33,6 +33,17 @@ BC=$(which bc 2> /dev/null) || BC=
 VALID_TEST_ID="[0-9]\{3\}"
 VALID_TEST_NAME="$VALID_TEST_ID-\?[[:alnum:]-]*"
 
+# When running tests with a realtime device configured, the realtime inherit
+# flag will be set during mkfs via -d rtinherit=1 option.  For some tests
+# this may render the test invalid (i.e. it uses a function which is not
+# supported by the realtime subvolume); to prevent failure these tests may
+# disable this behavior by calling _require_no_rtinherit .
+_require_no_rtinherit()
+{
+  echo "$MKFS_OPTIONS" | egrep -q "rtinherit([^=]|=1)" && \
+    _notrun "rtinherit mkfs option is not supported by this test."
+}
+
 _require_math()
 {
 	if [ -z "$BC" ]; then
diff --git a/tests/generic/250 b/tests/generic/250
index 3c4fe6d..a8fd97e 100755
--- a/tests/generic/250
+++ b/tests/generic/250
@@ -48,6 +48,9 @@ _require_scratch
 _require_dm_target error
 _require_xfs_io_command "falloc"
 _require_odirect
+# This test uses "dm" without taking into account the data could be on
+# realtime subvolume, thus the test will fail with rtinherit=1
+_require_no_rtinherit
 
 rm -f $seqres.full
 
diff --git a/tests/generic/252 b/tests/generic/252
index ffedd56..b506d59 100755
--- a/tests/generic/252
+++ b/tests/generic/252
@@ -47,6 +47,9 @@ _supported_os Linux
 _require_scratch
 _require_dm_target error
 _require_xfs_io_command "falloc"
+# This test uses "dm" without taking into account the data could be on
+# realtime subvolume, thus the test will fail with rtinherit=1
+_require_no_rtinherit
 _require_aiodio "aiocp"
 AIO_TEST="src/aio-dio-regress/aiocp"
 
diff --git a/tests/generic/441 b/tests/generic/441
index 075d877..5fbfece 100755
--- a/tests/generic/441
+++ b/tests/generic/441
@@ -47,6 +47,9 @@ _cleanup()
 # real QA test starts here
 _supported_os Linux
 _require_scratch
+# This test uses "dm" without taking into account the data could be on
+# realtime subvolume, thus the test will fail with rtinherit=1
+_require_no_rtinherit
 
 # Generally, we want to avoid journal errors on the extended testcase. Only
 # unset the -s flag if we have a logdev
diff --git a/tests/xfs/170 b/tests/xfs/170
index c5ae8e4..6deef1b 100755
--- a/tests/xfs/170
+++ b/tests/xfs/170
@@ -50,6 +50,7 @@ _supported_fs xfs
 _supported_os Linux
 
 _require_scratch
+_require_no_rtinherit
 
 _check_filestreams_support || _notrun "filestreams not available"
 
-- 
2.9.5