[Qemu-devel] [PATCH v2 1/2] qemu-iotests: Add "-c <cache-mode>" option

[Fam Zheng <famz@redhat.com>]

The option sets cache mode used in the tests. "-nocache" is changed to
an alias to "-c none", and internally passes "-t none" to qemu-io.

Python scripts will make use of option this in the next commit.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 tests/qemu-iotests/common | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/tests/qemu-iotests/common b/tests/qemu-iotests/common
index 8cde7f1..5314314 100644
--- a/tests/qemu-iotests/common
+++ b/tests/qemu-iotests/common
@@ -42,12 +42,14 @@ expunge=true
 have_test_arg=false
 randomize=false
 valgrind=false
+cachemode=false
 rm -f $tmp.list $tmp.tmp $tmp.sed
 
 export IMGFMT=raw
 export IMGFMT_GENERIC=true
 export IMGPROTO=file
 export IMGOPTS=""
+export CACHEMODE="writethrough"
 export QEMU_IO_OPTIONS=""
 
 for r
@@ -113,7 +115,11 @@ s/ .*//p
         IMGOPTS="$r"
         imgopts=false
         continue
-
+    elif $cachemode
+    then
+        CACHEMODE="$r"
+        cachemode=false
+        continue
     fi
 
     xpand=true
@@ -147,6 +153,7 @@ check options
     -o options          -o options to pass to qemu-img create/convert
     -T                        output timestamps
     -r                         randomize test order
+    -c                  cache mode
 
 testlist options
     -g group[,group...]        include tests from these groups
@@ -219,7 +226,7 @@ testlist options
             xpand=false
             ;;
         -nocache)
-            QEMU_IO_OPTIONS="$QEMU_IO_OPTIONS --nocache"
+            CACHEMODE="none"
             xpand=false
             ;;
 
@@ -258,6 +265,10 @@ testlist options
             imgopts=true
             xpand=false
             ;;
+        -c)
+            cachemode=true
+            xpand=false
+            ;;
         -r)        # randomize test order
             randomize=true
             xpand=false
@@ -334,6 +345,9 @@ BEGIN        { for (t='$start'; t<='$end'; t++) printf "%03d\n",t }' \
 
 done
 
+# Set qemu-io cache mode with $CACHEMODE we have
+QEMU_IO_OPTIONS="$QEMU_IO_OPTIONS -t $CACHEMODE"
+
 # Set default options for qemu-img create -o if they were not specified
 _set_default_imgopts
 
-- 
1.8.4.2