Block layer patches

- Lock the graph, part 2 (BlockDriver callbacks)
- virtio-scsi: fix SCSIDevice hot unplug with IOThread
- rbd: Add support for layered encryption

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# gpg: Signature made Thu 23 Feb 2023 18:49:41 GMT
# gpg:                using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg:                issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* tag 'for-upstream' of https://repo.or.cz/qemu/kevin

: (29 commits)
  block/rbd: Add support for layered encryption
  block/rbd: Add luks-any encryption opening option
  block/rbd: Remove redundant stack variable passphrase_len
  virtio-scsi: reset SCSI devices from main loop thread
  dma-helpers: prevent dma_blk_cb() vs dma_aio_cancel() race
  scsi: protect req->aiocb with AioContext lock
  block: Mark bdrv_co_refresh_total_sectors() and callers GRAPH_RDLOCK
  block: Mark bdrv_*_dirty_bitmap() and callers GRAPH_RDLOCK
  block: Mark bdrv_co_delete_file() and callers GRAPH_RDLOCK
  block: Mark bdrv_(un)register_buf() GRAPH_RDLOCK
  block: Mark bdrv_co_eject/lock_medium() and callers GRAPH_RDLOCK
  block: Mark bdrv_co_is_inserted() and callers GRAPH_RDLOCK
  block: Mark bdrv_co_io_(un)plug() and callers GRAPH_RDLOCK
  block: Mark bdrv_co_create() and callers GRAPH_RDLOCK
  block: Mark preadv_snapshot/snapshot_block_status GRAPH_RDLOCK
  block: Mark bdrv_co_copy_range() GRAPH_RDLOCK
  block: Mark bdrv_co_do_pwrite_zeroes() GRAPH_RDLOCK
  block: Mark bdrv_co_pwrite_sync() and callers GRAPH_RDLOCK
  block: Mark public read/write functions GRAPH_RDLOCK
  block: Mark read/write in block/io.c GRAPH_RDLOCK
  ...

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