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block: add bdrv_co_drain_end callback

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BlockDriverState has a bdrv_co_drain() callback but no equivalent for
the end of the drain. The throttle driver (block/throttle.c) needs a way
to mark the end of the drain in order to toggle io_limits_disabled
correctly, thus bdrv_co_drain_end is needed.

Signed-off-by: Manos Pitsidianakis <el13635@mail.ntua.gr>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Manos Pitsidianakis 2017-09-23 14:14:09 +03:00 • committed by Stefan Hajnoczi
parent f90ea7ba7c
commit 481cad48e5
2 changed files with 43 additions and 16 deletions
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11
include/block/block_int.h
View file

@ -354,10 +354,17 @@ struct BlockDriver {
int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo);
/**
* Drain and stop any internal sources of requests in the driver, and
* remain so until next I/O callback (e.g. bdrv_co_writev) is called.
* bdrv_co_drain is called if implemented in the beginning of a
* drain operation to drain and stop any internal sources of requests in
* the driver.
* bdrv_co_drain_end is called if implemented at the end of the drain.
*
* They should be used by the driver to e.g. manage scheduled I/O
* requests, or toggle an internal state. After the end of the drain new
* requests will continue normally.
*/
void coroutine_fn (*bdrv_co_drain)(BlockDriverState *bs);
void coroutine_fn (*bdrv_co_drain_end)(BlockDriverState *bs);
void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child,
Error **errp);