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block: add new BlockDriver handler: bdrv_cancel_in_flight

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It will be used to stop retrying NBD requests on mirror cancel.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210205163720.887197-2-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-02-05 19:37:11 +03:00 • committed by Eric Blake
parent c90e3512a4
commit bd54669a4a
3 changed files with 23 additions and 0 deletions
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9
include/block/block_int.h
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@ -352,6 +352,15 @@ struct BlockDriver {
bool want_zero, int64_t offset, int64_t bytes, int64_t *pnum,
int64_t *map, BlockDriverState **file);
/*
* This informs the driver that we are no longer interested in the result
* of in-flight requests, so don't waste the time if possible.
*
* One example usage is to avoid waiting for an nbd target node reconnect
* timeout during job-cancel.
*/
void (*bdrv_cancel_in_flight)(BlockDriverState *bs);
/*
* Invalidate any cached meta-data.
*/