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block: Convert bdrv_io_plug() to co_wrapper

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BlockDriver->bdrv_io_plug is categorized as IO callback, and it
currently doesn't run in a coroutine. We should let it take a graph
rdlock since the callback traverses the block nodes graph, which however
is only possible in a coroutine.

The only caller of this function is blk_io_plug(), therefore make
blk_io_plug() a co_wrapper, so that we're always running in a coroutine
where the lock can be taken.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230113204212.359076-3-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2023-01-13 21:42:00 +01:00 • committed by Kevin Wolf
parent 5b317b8dd9
commit 8f49745432
7 changed files with 19 additions and 16 deletions
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2
include/block/block_int-common.h
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@ -725,7 +725,7 @@ struct BlockDriver {
void (*bdrv_debug_event)(BlockDriverState *bs, BlkdebugEvent event);
/* io queue for linux-aio */
void (*bdrv_io_plug)(BlockDriverState *bs);
void coroutine_fn (*bdrv_co_io_plug)(BlockDriverState *bs);
void (*bdrv_io_unplug)(BlockDriverState *bs);
/**