Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches

# gpg: Signature made Fri 18 Dec 2015 13:41:03 GMT using RSA key ID C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"

* remotes/kevin/tags/for-upstream: (48 commits)
  block/qapi: allow best-effort query
  qemu-img: abort when full_backing_filename not present
  block/qapi: explicitly warn if !has_full_backing_filename
  block/qapi: always report full_backing_filename
  block/qapi: do not redundantly print "actual path"
  qemu-iotests: s390x: fix test 068
  qemu-iotests: s390x: fix test 051
  qemu-iotests: refine common.config
  block: fix bdrv_ioctl called from coroutine
  block: use drained section around bdrv_snapshot_delete
  iotests: Update comments for bdrv_swap() in 094
  block: Remove prototype of bdrv_swap from header
  raw-posix: Make aio=native option binding
  qcow2: insert assert into qcow2_get_specific_info()
  iotests: Extend test 112 for qemu-img amend
  qcow2: Point to amend function in check
  qcow2: Invoke refcount order amendment function
  qcow2: Add function for refcount order amendment
  qcow2: Use intermediate helper CB for amend
  qcow2: Split upgrade/downgrade paths for amend
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 773 insertions, 0 deletions

diff --git a/tests/qemu-iotests/142.out b/tests/qemu-iotests/142.out
new file mode 100644
index 0000000000..b555d5a255
--- /dev/null
+++ b/tests/qemu-iotests/142.out
@@ -0,0 +1,773 @@
+QA output created by 142
+Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
+Formatting 'TEST_DIR/t.IMGFMT.snap', fmt=IMGFMT size=134217728
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
+
+=== Simple test for all cache modes ===
+
+Testing: -drive file=TEST_DIR/t.qcow2,cache=none
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qququiquit
+
+Testing: -drive file=TEST_DIR/t.qcow2,cache=directsync
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qququiquit
+
+Testing: -drive file=TEST_DIR/t.qcow2,cache=writeback
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qququiquit
+
+Testing: -drive file=TEST_DIR/t.qcow2,cache=writethrough
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qququiquit
+
+Testing: -drive file=TEST_DIR/t.qcow2,cache=unsafe
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qququiquit
+
+Testing: -drive file=TEST_DIR/t.qcow2,cache=invalid_value
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,cache=invalid_value: invalid cache option
+
+
+=== Check inheritance of cache modes ===
+
+
+--- Configure cache modes on the command line ---
+
+cache.direct=on on none0
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on file
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.direct=on on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+
+
+cache.writeback=off on none0
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+
+cache.writeback=off on file
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.writeback=off on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+
+cache.writeback=off on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+
+
+cache.no-flush=on on none0
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+
+cache.no-flush=on on file
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.no-flush=on on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+
+cache.no-flush=on on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+
+--- Cache modes after reopen (live snapshot) ---
+
+cache.direct=on on none0
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.direct=on on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+
+
+cache.writeback=off on none0
+    Cache mode:       writethrough
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+
+cache.writeback=off on file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.writeback=off on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+
+cache.writeback=off on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+
+
+cache.no-flush=on on none0
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+
+cache.no-flush=on on file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.no-flush=on on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+
+cache.no-flush=on on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+
+--- Change cache modes with reopen (qemu-io command, flags) ---
+
+cache.direct=on on none0
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+
+cache.writeback=off on none0
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.writeback=off on file
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.writeback=off on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough, direct
+    Cache mode:       writeback, direct
+
+cache.writeback=off on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough, direct
+
+
+cache.no-flush=on on none0
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.no-flush=on on file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct, ignore flushes
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.no-flush=on on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct, ignore flushes
+    Cache mode:       writeback, direct, ignore flushes
+
+cache.no-flush=on on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct, ignore flushes
+
+--- Change cache modes with reopen (qemu-io command, options) ---
+
+cache.direct=on on none0
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+
+cache.writeback=off on none0
+    Cache mode:       writethrough, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough, direct
+    Cache mode:       writeback, direct
+
+cache.writeback=off on file
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.writeback=off on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough, direct
+    Cache mode:       writeback, direct
+
+cache.writeback=off on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough, direct
+
+
+cache.no-flush=on on none0
+    Cache mode:       writeback, direct, ignore flushes
+    Cache mode:       writeback, direct, ignore flushes
+    Cache mode:       writeback, direct, ignore flushes
+    Cache mode:       writeback, direct, ignore flushes
+
+cache.no-flush=on on file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct, ignore flushes
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.no-flush=on on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct, ignore flushes
+    Cache mode:       writeback, direct, ignore flushes
+
+cache.no-flush=on on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct, ignore flushes
+
+--- Change cache modes after snapshot ---
+
+cache.direct=on on none0
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.direct=on on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+
+
+cache.writeback=off on none0
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+
+cache.writeback=off on file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.writeback=off on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+
+cache.writeback=off on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+
+
+cache.no-flush=on on none0
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+
+cache.no-flush=on on file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.no-flush=on on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+
+cache.no-flush=on on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+
+--- Change cache mode in parent, child has explicit option in JSON ---
+
+    Cache mode:       writethrough, direct, ignore flushes
+    Cache mode:       writeback, direct, ignore flushes
+    Cache mode:       writethrough, ignore flushes
+
+=== Check that referenced BDSes don't inherit ===
+
+
+--- Configure cache modes on the command line ---
+
+cache.direct=on on blk
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.direct=on on file
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.direct=on on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+
+cache.direct=on on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+
+
+cache.writeback=off on blk
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.writeback=off on file
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.writeback=off on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+
+cache.writeback=off on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+
+
+cache.no-flush=on on blk
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.no-flush=on on file
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.no-flush=on on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+
+cache.no-flush=on on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+
+--- Cache modes after reopen (live snapshot) ---
+
+cache.direct=on on blk
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.direct=on on file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.direct=on on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+
+cache.direct=on on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+
+
+cache.writeback=off on blk
+    Cache mode:       writethrough
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.writeback=off on file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.writeback=off on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+
+cache.writeback=off on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+
+
+cache.no-flush=on on blk
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.no-flush=on on file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.no-flush=on on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+
+cache.no-flush=on on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+
+--- Change cache modes with reopen (qemu-io command, flags) ---
+
+cache.direct=on on blk
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.direct=on on file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.direct=on on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+
+cache.direct=on on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+
+
+cache.writeback=off on blk
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.writeback=off on file
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.writeback=off on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback
+
+cache.writeback=off on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough
+
+
+cache.no-flush=on on blk
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.no-flush=on on file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+    Cache mode:       writeback
+
+cache.no-flush=on on backing
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback
+
+cache.no-flush=on on backing-file
+    Cache mode:       writeback, direct
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+
+=== Reopening children instead of the root ===
+
+
+--- Basic reopen ---
+
+cache.direct=on on none0
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on file
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.direct=on on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+
+cache.writeback=off on none0
+    Cache mode:       writethrough
+    Cache mode:       writeback
+    Cache mode:       writethrough, direct
+    Cache mode:       writeback, direct
+
+cache.writeback=off on file
+    Cache mode:       writeback
+    Cache mode:       writethrough
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.writeback=off on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writethrough, direct
+    Cache mode:       writeback, direct
+
+cache.writeback=off on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough, direct
+
+
+cache.no-flush=on on none0
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, direct, ignore flushes
+    Cache mode:       writeback, direct, ignore flushes
+
+cache.no-flush=on on file
+    Cache mode:       writeback
+    Cache mode:       writeback, ignore flushes
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct
+
+cache.no-flush=on on backing
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct, ignore flushes
+    Cache mode:       writeback, direct, ignore flushes
+
+cache.no-flush=on on backing-file
+    Cache mode:       writeback
+    Cache mode:       writeback
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, direct, ignore flushes
+
+--- Change cache mode after reopening child ---
+
+    Cache mode:       writeback, direct
+    Cache mode:       writethrough
+    Cache mode:       writeback, direct
+    Cache mode:       writeback, ignore flushes
+*** done