Re: [PATCH] xfs/424: add check for crc and finobt

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Hi Eric,

When finobt is disabled, xfs_db gets double crc errors on upstream xfsporgs-dev.
as below(e.g. block size is 4096):
...
xfs_db -c "daddr 16" -c "type finobt" /dev/sda11
Metadata corruption detected at xfs_inobt block 0x10/0x1000
Metadata corruption detected at xfs_inobt block 0x10/0x1000

Is this expected behavor?  Because xfs_db gets one crc error on v4.5 xfsprogs-dev.
as below(e.g. block size is 4096):
...
xfs_db -c "daddr 16" -c "type finobt" /dev/sda11
Metadata CRC error detected at xfs_inobt block 0x10/0x200

Thanks,
Xiao Yang.
On 2017/08/03 22:57, Eric Sandeen wrote:
On 8/3/17 7:05 AM, Xiao Yang wrote:
1) When crc is not supported or disabled, this case could not indicate
    any expected error.  Running all tests without crc makes no sense.
It's still fine to run the test.  The description indicates
that errors may be seen on crc filesystems, but there's nothing
wrong with a test which iterates over "type" commands in xfs_db,
even without crcs.  It's possible that some other error could
be found in the future.

So perhaps the description should be updated; it does not "check for
that false crc error," it simply checks that setting types causes
/no/ error.

2) When finobt is disabled, xfs_db fails to get current address of
    free_root, as below:
    xfs_db -c "agi" -c "addr free_root" -c "daddr" /dev/sda11
    Metadata CRC error detected at xfs_inobt block 0x0/0x1000
    ...
I agree that the test should not be trying to set types that do
not exist on the filesystem.

But I think the right approach is to let the test run over whatever
MKFS_OPTIONS have been specified, and be sure that the test can handle
it properly, rather than forcing the test to run only with a certain
set of options enabled.

Thanks,
-Eric

    Running related tests without finobt makes no sense.

We add check to fix it.

Signed-off-by: Xiao Yang<yangx.jy@xxxxxxxxxxxxxx>
---
  tests/xfs/424 | 16 ++++++++++++----
  1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/tests/xfs/424 b/tests/xfs/424
index 0a1eef9..165c390 100755
--- a/tests/xfs/424
+++ b/tests/xfs/424
@@ -55,9 +55,15 @@ rm -f $seqres.full
  _supported_os Linux
  _supported_fs xfs
  _require_scratch
+_require_xfs_mkfs_crc

  echo "Silence is golden."

+crc_finobt_enabled="crc=1,finobt=0"
+
+[ _scratch_mkfs_xfs_supported -m crc=1,finobt=1>/dev/null 2>&1 ]&&  \
+	crc_finobt_enabled="crc=1,finobt=1"
+
  # real QA test starts here

  # for different sector sizes, ensure no CRC errors are falsely reported.
@@ -77,7 +83,7 @@ while [ $sec_sz -le 4096 ]; do
  done

  for SECTOR_SIZE in $sector_sizes; do
-	$MKFS_XFS_PROG -f -s size=$SECTOR_SIZE $SCRATCH_DEV>  /dev/null
+	$MKFS_XFS_PROG -f -m "$crc_finobt_enabled" -s size=$SECTOR_SIZE $SCRATCH_DEV>  /dev/null

  	for TYPE in agf agi agfl sb; do
  		DADDR=`_scratch_xfs_db -c "$TYPE" -c "daddr" | filter_dbval`
@@ -96,9 +102,11 @@ for SECTOR_SIZE in $sector_sizes; do
  	DADDR=`_scratch_xfs_db -c "agi" -c "addr root" -c "daddr" |
  		filter_dbval`
  	_scratch_xfs_db -c "daddr $DADDR" -c "type inobt"
-	DADDR=`_scratch_xfs_db -c "agi" -c "addr free_root" -c "daddr" |
-		filter_dbval`
-	_scratch_xfs_db -c "daddr $DADDR" -c "type finobt"
+	if [[ "$crc_finobt_enabled" =~ 'finobt=1' ]]; then
+		DADDR=`_scratch_xfs_db -c "agi" -c "addr free_root" -c "daddr" |
+			filter_dbval`
+		_scratch_xfs_db -c "daddr $DADDR" -c "type finobt"
+	fi

  	_scratch_xfs_db -c "daddr $DADDR" -c "type text"
  	_scratch_xfs_db -c "daddr $DADDR" -c "type data"

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