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Re: [Qemu-block] [PATCH 00/29] qed: Convert to coroutines

From: Paolo Bonzini
Subject: Re: [Qemu-block] [PATCH 00/29] qed: Convert to coroutines
Date: Mon, 29 May 2017 13:22:41 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0

On 26/05/2017 22:21, Kevin Wolf wrote:
> The qed block driver is one of the last remaining block drivers that use the
> AIO callback style interfaces. This series converts it to the coroutine model
> that other drivers are using and removes some AIO functions from the block
> layer API afterwards.
> If this isn't compelling enough, the diffstat should speak for itself.
> This series is relatively long, but it consists mostly of mechanical
> conversions of one function per patch, so it should be easy to review.

Looks great, just a few notes:

- There are a couple "Callback from qed_find_cluster()" comments that 
are obsolete.

- qed_acquire/qed_release can be removed as you inline stuff, but this
should not cause bugs so you can either do it as a final patch or let
me remove it later.

- coroutine_fn annotations are missing.  Also can be done as a final
patch.  It's a bit ugly that L1/L2 table access can happen both in a
coroutine (for regular I/O) and outside (for create/check).

- qed_is_allocated_cb can be inlined and QEDIsAllocatedCB removed.  Of
course a lot more cleanup could be done (I will do a couple more such
changes when adding a CoMutex to make the driver thread-safe) but this
one is pretty low-hanging fruit and seems to be in line with the rest
of the patches.

- qed_co_request doesn't need g_new for the QEDAIOCB.


> Kevin Wolf (29):
>   qed: Use bottom half to resume waiting requests
>   qed: Make qed_read_table() synchronous
>   qed: Remove callback from qed_read_table()
>   qed: Remove callback from qed_read_l2_table()
>   qed: Remove callback from qed_find_cluster()
>   qed: Make qed_read_backing_file() synchronous
>   qed: Make qed_copy_from_backing_file() synchronous
>   qed: Remove callback from qed_copy_from_backing_file()
>   qed: Make qed_write_header() synchronous
>   qed: Remove callback from qed_write_header()
>   qed: Make qed_write_table() synchronous
>   qed: Remove GenericCB
>   qed: Remove callback from qed_write_table()
>   qed: Make qed_aio_read_data() synchronous
>   qed: Make qed_aio_write_main() synchronous
>   qed: Inline qed_commit_l2_update()
>   qed: Add return value to qed_aio_write_l1_update()
>   qed: Add return value to qed_aio_write_l2_update()
>   qed: Add return value to qed_aio_write_main()
>   qed: Add return value to qed_aio_write_cow()
>   qed: Add return value to qed_aio_write_inplace/alloc()
>   qed: Add return value to qed_aio_read/write_data()
>   qed: Remove ret argument from qed_aio_next_io()
>   qed: Remove recursion in qed_aio_next_io()
>   qed: Implement .bdrv_co_readv/writev
>   qed: Use CoQueue for serialising allocations
>   qed: Simplify request handling
>   qed: Use a coroutine for need_check_timer
>   block: Remove bdrv_aio_readv/writev_flush()
>  block/Makefile.objs   |   2 +-
>  block/io.c            | 171 -----------
>  block/qed-cluster.c   | 123 ++++----
>  block/qed-gencb.c     |  33 ---
>  block/qed-table.c     | 261 ++++++-----------
>  block/qed.c           | 763 
> +++++++++++++++++++-------------------------------
>  block/qed.h           |  53 +---
>  include/block/block.h |   8 -
>  8 files changed, 432 insertions(+), 982 deletions(-)
>  delete mode 100644 block/qed-gencb.c

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