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Re: [Qemu-block] [PATCH v5 0/3] Dynamic module loading for block drivers

From: Max Reitz
Subject: Re: [Qemu-block] [PATCH v5 0/3] Dynamic module loading for block drivers
Date: Sat, 23 Jul 2016 20:21:35 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 20.07.2016 16:30, Colin Lord wrote:
> Here's v5 of the modularization series. Since it seems the concensus is
> that modularizing the format drivers is unnecessary, this series no
> longer modularizes those and is thus much shorter than before.
> v5:
> - No format drivers are modularized, therefore the probe functions are
>   all being left completely untouched. The bdrv_find_format function is
>   also left untouched as a result.

You also left the (host) device probing functions untouched in this
revision. However, those are actually only used by protocol drivers
(raw-posix and raw-win32, to be specific).

Probably fine since I think it's impossible to build raw-posix or
raw-win32 as a module anyway (because bdrv_file is used as a "static"
reference in block.c).

> - Remove dmg from block-obj-m since it is not a target of the
>   modularization effort.

Hm, I'm afraid I don't quite understand the reasoning behind this.
Intuitively, I'd say "Doesn't matter, it was already modular, so what
prevents it from staying that way?"

Is it because the changes to util/module.c in patch 3 break how the dmg
module worked, e.g. that it was always implicitly fully loaded on qemu
startup if it was available, but now modules are only loaded on request?


> - Modify module_block.py to only include the library name and protocol
>   name fields in the generated struct. The other fields are no longer
>   necessary for the drivers that are being modularized.
> v4:
> - Fix indentation of the generated header file module_block.h
> - Drivers and probe functions are now all located in the block/
>   directory, rather than being split between block/ and block/probe/. In
>   addition the header files for each probe/driver pair are in the block/
>   directory, not the include/block/driver/ directory (which no longer
>   exists).
> - Since the probe files are in block/ now, they follow the naming
>   pattern of format-probe.c
> - Renamed crypto probe file to be crypto-probe.c, luks is no longer in
>   the filename
> - Fixed formatting of parallels_probe() function header
> - Enforced consistent naming convention for the probe functions. They
>   now follow the pattern bdrv_format_probe().
> Colin Lord (1):
>   blockdev: prepare iSCSI block driver for dynamic loading
> Marc Mari (2):
>   blockdev: Add dynamic generation of module_block.h
>   blockdev: Add dynamic module loading for block drivers
>  Makefile                        |   7 +++
>  block.c                         |  37 ++++++++++++---
>  block/Makefile.objs             |   3 +-
>  block/iscsi.c                   |  36 --------------
>  include/qemu/module.h           |   3 ++
>  scripts/modules/module_block.py | 102 
> ++++++++++++++++++++++++++++++++++++++++
>  util/module.c                   |  38 +++++----------
>  vl.c                            |  38 +++++++++++++++
>  8 files changed, 193 insertions(+), 71 deletions(-)
>  create mode 100644 scripts/modules/module_block.py

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