[PATCH] xfststs: add a helper to get the minimum dio size

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

Various tests opencode checks to find out the minimum support direct I/O
size.  Replace those with a generic helper that handles network filesystems as
well.  Also remove the Linux 2.4 workaround we had in once place.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>

diff --git a/common/rc b/common/rc
index ea3af12..64139c8 100644
--- a/common/rc
+++ b/common/rc
@@ -2179,6 +2179,21 @@ _scale_fsstress_args()
     echo $args
 }
 
+#
+# Return the logical block size if running on a block device,
+# else substitute the page size.
+#
+_min_dio_alignment()
+{
+    dev=$1
+
+    if [ -b "$dev" ]; then
+        blockdev --getss $dev
+    else
+        $here/src/feature -s
+    fi
+}
+
 run_check()
 {
        echo "# $@" >> $seqres.full 2>&1
diff --git a/tests/generic/091 b/tests/generic/091
index cee012d..d0f5800 100755
--- a/tests/generic/091
+++ b/tests/generic/091
@@ -54,11 +54,7 @@ run_fsx()
 }
 
 psize=`$here/src/feature -s`
-bsize=`blockdev --getss $TEST_DEV`
-kernel=`uname -r  | sed -e 's/\(2\..\).*/\1/'`
-
-# 2.4 Linux kernels support bsize aligned direct I/O only
-[ "$HOSTOS" = "Linux" -a "$kernel" = "2.4" ] && bsize=$psize
+bsize=`_min_dio_alignment $TEST_DEV`
 
 # fsx usage:
 # 
diff --git a/tests/generic/240 b/tests/generic/240
index e692318..d3fd442 100755
--- a/tests/generic/240
+++ b/tests/generic/240
@@ -60,7 +60,7 @@ rm -f $seqres.full
 
 rm -f $TEST_DIR/aiodio_sparse
 
-logical_block_size=`blockdev --getss $TEST_DEV`
+logical_block_size=`_min_dio_alignment $TEST_DEV`
 fs_block_size=`stat -f $TEST_DIR | grep "Block size:" | awk '{print $3}'`
 
 if [ $fs_block_size -le $logical_block_size ]; then
diff --git a/tests/generic/263 b/tests/generic/263
index 377b199..094c3d1 100755
--- a/tests/generic/263
+++ b/tests/generic/263
@@ -54,7 +54,7 @@ run_fsx()
 }
 
 psize=`$here/src/feature -s`
-bsize=`blockdev --getss $TEST_DEV`
+bsize=`_min_dio_alignment $TEST_DEV`
 
 run_fsx -N 10000  -o 8192   -l 500000 -r PSIZE -t BSIZE -w BSIZE -Z
 run_fsx -N 10000  -o 128000 -l 500000 -r PSIZE -t BSIZE -w BSIZE -Z