[PATCH v2 00/31] block/export: Add infrastructure and QAPI for block exports

[Kevin Wolf <kwolf@redhat.com>]

We are planning to add more block export types than just NBD in the near
future (e.g. vhost-user-blk and FUSE). This series lays the ground for
this with some generic block export infrastructure and QAPI interfaces
that will allow managing all of them (for now add/remove/query).

As a side effect, qemu-storage-daemon can now map --export directly to
the block-export-add QMP command, similar to other command line options.
The built-in NBD servers also gains new options that bring it at least a
little closer to feature parity with qemu-nbd.

v2:
- Rebased on current master
- Fixed assumption of &blk_exp_nbd instead of drv in generic code [Max]
- Documented blk_exp_request_shutdown() better [Max]
- iotests 140: Fixed race between QMP return value and event [Max]
- Improved the commit message for patch 26
- Removed copy&paste error in deprecated.rst [Max]
- iotests: Take Sequence instead of positional arguments in
  qemu_tool_pipe_and_status() [Max]
- iotests: Separate patch for qemu_nbd_list_log [Max]
- iotests 307: [Max]
  * Allow more image formats
  * Use sock_dir for the socket
  * Use f-strings instead of % operator
  * Log events after deleting an export
  * Test force removing an export

Kevin Wolf (31):
  nbd: Remove unused nbd_export_get_blockdev()
  qapi: Create block-export module
  qapi: Rename BlockExport to BlockExportOptions
  block/export: Add BlockExport infrastructure and block-export-add
  qemu-storage-daemon: Use qmp_block_export_add()
  qemu-nbd: Use raw block driver for --offset
  block/export: Remove magic from block-export-add
  nbd: Add max-connections to nbd-server-start
  nbd: Add writethrough to block-export-add
  nbd: Remove NBDExport.close callback
  qemu-nbd: Use blk_exp_add() to create the export
  nbd/server: Simplify export shutdown
  block/export: Move refcount from NBDExport to BlockExport
  block/export: Move AioContext from NBDExport to BlockExport
  block/export: Add node-name to BlockExportOptions
  block/export: Allocate BlockExport in blk_exp_add()
  block/export: Add blk_exp_close_all(_type)
  block/export: Add 'id' option to block-export-add
  block/export: Move strong user reference to block_exports
  block/export: Add block-export-del
  block/export: Add BLOCK_EXPORT_DELETED event
  block/export: Move blk to BlockExport
  block/export: Create BlockBackend in blk_exp_add()
  block/export: Add query-block-exports
  block/export: Move writable to BlockExportOptions
  nbd: Merge nbd_export_new() and nbd_export_create()
  nbd: Deprecate nbd-server-add/remove
  iotests: Factor out qemu_tool_pipe_and_status()
  iotests: Introduce qemu_nbd_list_log()
  iotests: Allow supported and unsupported formats at the same time
  iotests: Test block-export-* QMP interface

 qapi/block-core.json                 | 166 --------------
 qapi/block-export.json               | 291 ++++++++++++++++++++++++
 qapi/qapi-schema.json                |   1 +
 docs/system/deprecated.rst           |   6 +
 include/block/export.h               |  89 ++++++++
 include/block/nbd.h                  |  22 +-
 block.c                              |   2 +-
 block/export/export.c                | 325 +++++++++++++++++++++++++++
 block/monitor/block-hmp-cmds.c       |  13 +-
 blockdev-nbd.c                       | 171 +++++++-------
 nbd/server.c                         | 309 +++++++++++--------------
 qemu-nbd.c                           |  67 +++---
 storage-daemon/qemu-storage-daemon.c |  27 +--
 tests/qemu-iotests/iotests.py        |  68 +++---
 block/export/meson.build             |   1 +
 block/meson.build                    |   2 +
 meson.build                          |   2 +-
 qapi/meson.build                     |   4 +-
 storage-daemon/qapi/qapi-schema.json |   1 +
 tests/qemu-iotests/140               |   9 +-
 tests/qemu-iotests/140.out           |   2 +-
 tests/qemu-iotests/223.out           |   8 +-
 tests/qemu-iotests/307               | 132 +++++++++++
 tests/qemu-iotests/307.out           | 124 ++++++++++
 tests/qemu-iotests/group             |   1 +
 25 files changed, 1311 insertions(+), 532 deletions(-)
 create mode 100644 qapi/block-export.json
 create mode 100644 include/block/export.h
 create mode 100644 block/export/export.c
 create mode 100644 block/export/meson.build
 create mode 100755 tests/qemu-iotests/307
 create mode 100644 tests/qemu-iotests/307.out

-- 
2.25.4