generic/{094,225}: skip test when the xfs rt extent size is larger than 1 fsb

These two tests call various fallocate modes on a file and compare the
FIEMAP output to some golden output.  Unfortunately, the golden output
doesn't take into account the possibility that (on XFS) the files could be
created on a realtime volume with a large rt extent size set.

Under such a configuration, fpunch operations that are aligned to the fs
block size but not the rt extent size simply result in those blocks
being set to unwritten status.  Unfortunately, the test expects holes
and fails.  Therefore, detect the situation and skip the tests.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

common/rc

@@ -4131,6 +4131,16 @@ _get_block_size()
 	stat -f -c %S $1
 }
 
+# Require that the fundamental allocation unit of a file is the same as the
+# filesystem block size.
+_require_file_block_size_equals_fs_block_size()
+{
+	local file_alloc_unit="$(_get_file_block_size $1)"
+	local fs_block_size="$(_get_block_size $1)"
+	test "$file_alloc_unit" != "$fs_block_size" && \
+		_notrun "File allocation unit is larger than a filesystem block"
+}
+
 get_page_size()
 {
 	echo $(getconf PAGE_SIZE)

tests/generic/094

@@ -40,6 +40,11 @@ fiemapfile=$SCRATCH_MNT/$seq.fiemap
 
 _require_test_program "fiemap-tester"
 
+# FIEMAP test doesn't like finding unwritten blocks after it punches out
+# a partial rt extent.
+test "$FSTYP" = "xfs" && \
+	_require_file_block_size_equals_fs_block_size $fiemapfile
+
 seed=`date +%s`
 
 echo "using seed $seed" >> $seqres.full

tests/generic/225

@@ -40,6 +40,11 @@ fiemaplog=$SCRATCH_MNT/$seq.log
 
 _require_test_program "fiemap-tester"
 
+# FIEMAP test doesn't like finding unwritten blocks after it punches out
+# a partial rt extent.
+test "$FSTYP" = "xfs" && \
+	_require_file_block_size_equals_fs_block_size $fiemapfile
+
 seed=`date +%s`
 
 echo "using seed $seed" >> $fiemaplog