Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- Graph locking part 6 (bs->file/backing)
- ahci: trigger either error IRQ or regular IRQ, not both

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

: (25 commits)
  hw/ide/ahci: trigger either error IRQ or regular IRQ, not both
  block: Protect bs->file with graph_lock
  block: Take graph lock for most of .bdrv_open
  vhdx: Take locks for accessing bs->file
  qcow2: Take locks for accessing bs->file
  block: Add missing GRAPH_RDLOCK annotations
  block: Introduce bdrv_co_change_backing_file()
  blkverify: Add locking for request_fn
  block: Protect bs->backing with graph_lock
  block: Mark bdrv_replace_node() GRAPH_WRLOCK
  block: Mark bdrv_replace_node_common() GRAPH_WRLOCK
  block: Inline bdrv_set_backing_noperm()
  block: Mark bdrv_set_backing_hd_drained() GRAPH_WRLOCK
  block: Mark bdrv_cow_child() and callers GRAPH_RDLOCK
  block: Mark bdrv_filter_child() and callers GRAPH_RDLOCK
  block: Mark bdrv_chain_contains() and callers GRAPH_RDLOCK
  block: Mark bdrv_(un)freeze_backing_chain() and callers GRAPH_RDLOCK
  block: Mark bdrv_skip_filters() and callers GRAPH_RDLOCK
  block: Mark bdrv_skip_implicit_filters() and callers GRAPH_RDLOCK
  block: Mark bdrv_filter_or_cow_bs() and callers GRAPH_RDLOCK
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>