[Qemu-devel] [PATCH v2 0/3] block: Warn about usage of growing formats over non-growable protocols

[Max Reitz <mreitz@redhat.com>]

Some image formats (e.g. qcow2) require the underlying file to grow on
write accesses, but this is in fact not supported by all protocols (e.g.
nbd does not). If such a format requiring file growth is used
non-read-only over a protocol which does not support this, a warning
should be issued.

This warning is issued for example whenever one tries to export a qcow2
image over nbd-server and use the export from qemu.


This series depends on v2 of my series
"block: driver should override flags in bdrv_open()".


v2: Reworked because BDS.growable has been removed in the meantime, so
    this version does not need to reuse it and thus break its intended
    use.


Max Reitz (3):
  iotests: Make nested read in 072 and 089 read-only
  block: Introduce BDS.growing
  block: Introduce BlockDriver.requires_growing_file

 block.c                   | 20 ++++++++++++++++++++
 block/blkdebug.c          |  2 ++
 block/blkverify.c         |  2 ++
 block/iscsi.c             |  2 ++
 block/nbd.c               |  2 ++
 block/qcow.c              |  1 +
 block/qcow2.c             |  7 +++++++
 block/qed.c               |  1 +
 block/quorum.c            |  5 +++++
 block/raw_bsd.c           |  1 +
 block/vdi.c               |  2 ++
 block/vhdx.c              |  2 ++
 block/vmdk.c              |  1 +
 block/vpc.c               |  2 ++
 include/block/block_int.h |  7 +++++++
 tests/qemu-iotests/072    |  2 +-
 tests/qemu-iotests/089    |  2 +-
 17 files changed, 59 insertions(+), 2 deletions(-)

-- 
2.1.0