[Qemu-devel] [PATCH v2 0/5] block: Ensure non-protocol drivers can only be selected explicitly

[Fabiano Rosas]

Block drivers can be selected by either protocol syntax:

  <protocol>:<filename>[:options]

or explicitly:

  driver=<driver>[,option=<opt1>...]

For the protocol syntax to work, drivers should set the protocol_name
field of the BlockDriver structure and provide bdrv_file_open and
bdrv_parse_filename implementations.

Conversely, block drivers that do not support the protocol syntax
should instead implement bdrv_open and not have a protocol_name field.

Some drivers do not currently adhere to this and errors arise when
trying to select them using the protocol syntax. For instance:

  $ qemu-img info replication:foo
  qemu-img: block.c:2401: bdrv_open_inherit: \
  Assertion `!!(flags & BDRV_O_PROTOCOL) == !!drv->bdrv_file_open' failed.
  Aborted (core dumped)

This patch-set ensures that the following drivers are meeting the
above criteria:
- blkreplay
- quorum
- replication
- throttle

Aside from that, documentation was added to make the above more
explicit.

v1 -> v2:
 - patch 1: updated commit message
 - patch 5: improved protocol_name documentation

 https://lists.nongnu.org/archive/html/qemu-devel/2018-03/msg02998.html

Fabiano Rosas (5):
  block/replication: Remove protocol_name field
  block/quorum: Remove protocol-related fields
  block/throttle: Remove protocol-related fields
  block/blkreplay: Remove protocol-related fields
  include/block/block_int: Document protocol related functions

 block/blkreplay.c         | 3 +--
 block/quorum.c            | 3 +--
 block/replication.c       | 1 -
 block/throttle.c          | 3 +--
 include/block/block_int.h | 8 ++++++++
 replication.h             | 1 -
 6 files changed, 11 insertions(+), 8 deletions(-)

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2.13.6