[Qemu-devel] [PATCH v2 0/2] block: fix BDRV_O_SNAPSHOT with protocols

[Stefan Hajnoczi <stefanha@redhat.com>]

Richard Jones <rjones@redhat.com> reported that BDRV_O_SNAPSHOT does not work
with NBD:

  /usr/bin/qemu-system-x86_64 \
  [...]
      -device virtio-scsi-pci,id=scsi \
      -drive file=nbd:localhost:61930,snapshot=on,format=raw,id=hd0,if=none \
      -device scsi-hd,drive=hd0 \
  [...]

  gives the error:

  qemu-system-x86_64: -drive file=nbd:localhost:61930,snapshot=on,format=raw,id=hd0,if=none: could not open disk image nbd:localhost:61930: No such file or directory

This series fixes the issue and adds a regression test, qemu-iotests 052.  Run
the test like this:

  $ QEMU_PROG=... PATH=... ./check -nbd 052

If Patch 1 is not applied, the test case fails.  Note that the test case is
also useful with -raw or other formats.

v2:
 * Rebased onto latest qemu.git/master

Stefan Hajnoczi (2):
  block: fix BDRV_O_SNAPSHOT protocol detection
  qemu-iotests: add 052 BDRV_O_SNAPSHOT test

 block.c                    |  6 +----
 tests/qemu-iotests/052     | 61 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/052.out | 13 ++++++++++
 tests/qemu-iotests/group   |  1 +
 4 files changed, 76 insertions(+), 5 deletions(-)
 create mode 100755 tests/qemu-iotests/052
 create mode 100644 tests/qemu-iotests/052.out

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1.8.1.4