Block layer patches:

- file-posix: Fix O_DIRECT alignment detection
 - Fixes for concurrent block jobs
 - block-backend: Queue requests while drained (fix IDE vs. job crashes)
 - qemu-img convert: Deprecate using -n and -o together
 - iotests: Migration tests with filter nodes
 - iotests: More media change tests
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Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches:

- file-posix: Fix O_DIRECT alignment detection
- Fixes for concurrent block jobs
- block-backend: Queue requests while drained (fix IDE vs. job crashes)
- qemu-img convert: Deprecate using -n and -o together
- iotests: Migration tests with filter nodes
- iotests: More media change tests

# gpg: Signature made Fri 16 Aug 2019 10:29:18 BST
# gpg:                using RSA key 7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream:
  file-posix: Handle undetectable alignment
  qemu-img convert: Deprecate using -n and -o together
  block-backend: Queue requests while drained
  mirror: Keep mirror_top_bs drained after dropping permissions
  block: Remove blk_pread_unthrottled()
  iotests: Add test for concurrent stream/commit
  tests: Test mid-drain bdrv_replace_child_noperm()
  tests: Test polling in bdrv_drop_intermediate()
  block: Reduce (un)drains when replacing a child
  block: Keep subtree drained in drop_intermediate
  block: Simplify bdrv_filter_default_perms()
  iotests: Test migration with all kinds of filter nodes
  iotests: Move migration helpers to iotests.py
  iotests/118: Add -blockdev based tests
  iotests/118: Create test classes dynamically
  iotests/118: Test media change for scsi-cd

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

blockjob.c

@@ -446,6 +446,9 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
 
     bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
 
+    /* Disable request queuing in the BlockBackend to avoid deadlocks on drain:
+     * The job reports that it's busy until it reaches a pause point. */
+    blk_set_disable_request_queuing(blk, true);
     blk_set_allow_aio_context_change(blk, true);
 
     /* Only set speed when necessary to avoid NotSupported error */