From: Zhu Yangyang <zhuyangyang14@huawei.com>

QMP may will be blocked for a long time on bdrv_drained_begin() when a
network disk is configured and the network failure is just about to occur.

In theory, any command may be blocked if it calls bdrv_drained_begin().

This series add a timeout parameter for qmp_block_set_io_throttle() and
qmp_block_resize() to control their execution duration.

Changelog
v4 ---
  1. Corrected the added version of the timeout parameter from 10.0 to 10.1
  2. Add a patch to add the timeout parameter for qmp_block_resize().

v3 ---
  Unify AIO_WAIT_WHILE_{TIMEOUT/INTERNAL} by replacing AIO_WAIT_WHILE_INTERNAL() with
  AIO_WAIT_WHILE_TIMEOUT(..., 0).

v2 ---
  1. Support 0 in BDRV_POLL_WHILE_TIMEOUT(), 0 means infinite.
  2. Use uint64_t timeout_ns instead of int64 timeout to name variables.
  3. Use timer_pending() to check for expiry instead of explicitly checking
     against the deadline for BDRV_POLL_WHILE_TIMEOUT().
  4. Add documentation for bdrv_drained_begin_timeout(), note that bdrv_drained_end()
     must be called when -ETIMEDOUT is returned.
  5. Add a timeout parameter to the qmp_block_set_io_throttle() instead of hardcoding
     the timeout, and the default value is 0, mean an infinite timeout.

v1 patch link:
https://lore.kernel.org/qemu-devel/20250308101618.721954-1-zoudongjie@huawei.com/


Zhu Yangyang (3):
  io/block: Refactoring the bdrv_drained_begin() function and implement
    a timeout mechanism.
  qapi/throttle: add timeout parameter for qmp_block_set_io_throttle()
  qapi/resize: add timeout parameter for qmp_block_resize()

 block/block-backend.c                       | 14 ++++-
 block/io.c                                  | 58 +++++++++++++++++----
 block/monitor/block-hmp-cmds.c              |  2 +-
 block/qapi-system.c                         | 10 +++-
 blockdev.c                                  | 16 +++++-
 include/block/aio-wait.h                    | 47 ++++++++++++-----
 include/block/block-io.h                    | 22 +++++++-
 include/system/block-backend-global-state.h |  1 +
 qapi/block-core.json                        | 11 +++-
 util/aio-wait.c                             |  5 ++
 10 files changed, 155 insertions(+), 31 deletions(-)

-- 
2.33.0