[Qemu-devel] [PATCH v2 0/4] block: fix blk_aio_*() segfault when blk->root == NULL

[Stefan Hajnoczi <stefanha@redhat.com>]

v2:
 * Introduce AIO_WAIT_WHILE() since aio_poll(ctx, true) is not allowed [Paolo]

Using bdrv_inc_in_flight(blk_bs(blk)) doesn't work since BlockBackend->root may
be NULL.

This patch series solves the issue by adding an BlockBackend->in_flight counter
so requests can be tracked even when there is no BlockDriverState.

This should fix the IDE and virtio-blk segfaults that have been encountered
when there is no BlockDriverState.

The patch is based on work by Kevin Wolf.

Kevin Wolf (1):
  block: test blk_aio_flush() with blk->root == NULL

Stefan Hajnoczi (3):
  block: extract AIO_WAIT_WHILE() from BlockDriverState
  block: add BlockBackend->in_flight counter
  Revert "IDE: Do not flush empty CDROM drives"

 tests/Makefile.include     |   2 +
 util/Makefile.objs         |   2 +-
 include/block/aio-wait.h   | 116 +++++++++++++++++++++++++++++++++++++++++++++
 include/block/block.h      |  40 +++-------------
 include/block/block_int.h  |   7 ++-
 block.c                    |   7 ++-
 block/block-backend.c      |  60 ++++++++++++++++++++---
 block/io.c                 |  10 +---
 hw/ide/core.c              |  10 +---
 tests/test-block-backend.c |  82 ++++++++++++++++++++++++++++++++
 util/aio-wait.c            |  40 ++++++++++++++++
 11 files changed, 313 insertions(+), 63 deletions(-)
 create mode 100644 include/block/aio-wait.h
 create mode 100644 tests/test-block-backend.c
 create mode 100644 util/aio-wait.c

-- 
2.14.3