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Re: [PATCH v5 00/31] block layer: split block APIs in global state and I

From: Emanuele Giuseppe Esposito
Subject: Re: [PATCH v5 00/31] block layer: split block APIs in global state and I/O
Date: Tue, 30 Nov 2021 09:39:57 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0

On 29/11/2021 14:32, Stefan Hajnoczi wrote:
On Wed, Nov 24, 2021 at 01:43:47AM -0500, Emanuele Giuseppe Esposito wrote:
v5 -> v6:
* In short, apply all Hanna's comments. More in details,
   the following functions in the following headers have been moved:
     blk_replace_bs (to gs)
     blk_nb_sectors (to io)
     blk_name (to io)
     blk_set_perm (to io)
     blk_get_perm (to io)
     blk_drain (to io)
     blk_abort_aio_request (to io)
     blk_make_empty (to gs)
     blk_invalidate_cache (was in io, but had GS assertion)
     blk_aio_cancel (to gs)
     bdrv_replace_child_bs (to gs)
     bdrv_get_device_name (to io)
     bdrv_get_device_or_node_name (to io)
     bdrv_drained_end_no_poll (to io)
     bdrv_block_status (was in io, but had GS assertion)
     bdrv_drain (to io)
     bdrv_co_drain (to io)
     bdrv_make_zero (was in GS, but did not have the assertion)
     bdrv_save_vmstate (to io)
     bdrv_load_vmstate (to io)
     bdrv_aio_cancel_async (to io)
     bdrv_get_parent_name (to io)
     bdrv_apply_subtree_drain (to io)
     bdrv_unapply_subtree_drain (to io)
     bdrv_co_copy_range_from (was in io, but had GS assertion)
     bdrv_co_copy_range_to (was in io, but had GS assertion)
     ->bdrv_save_vmstate (to io)
     ->bdrv_load_vmstate (to io)

   coding style (assertion after definitions):

   new patches:
     block.c: modify .attach and .detach callbacks of child_of_bds
     introduce pre_run as JobDriver callback to handle
       bdrv_co_amend usage of permission function
     leave blk_set/get_perm as a TODO in fuse.c
     make sure bdrv_co_invalidate_cache does not use permissions
       if BQL is not held

   minor changes:
     put back TODO for include block/block.h in block-backend-common.h
     rebase on kwolf/block branch
     modify where are used assert_bdrv_graph_writable, due to rebase

These changes sound fine to me. Hanna or Kevin can merge the series when
they are happy.

Just a tiny nitpick, I would just not merge patch 10: "block.c: modify .attach and .detach callbacks of child_of_bds". It is not wrong and should produce no side effect, but does not do what it was intended for (ie using the drain to protect the bs's list of children). I will work on that in a future serie. Apologies.

Thank you,

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