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block: add flush callback

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This patch adds callback for flush request. This callback is responsible
for flushing whole block devices stack. bdrv_flush function does not
proceed to underlying devices. It should be performed by this callback
function, if needed.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2016-03-14 10:44:53 +03:00 • committed by Kevin Wolf
parent 6278ae035f
commit c32b82afaf
2 changed files with 14 additions and 0 deletions
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7
include/block/block_int.h
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@ -175,6 +175,13 @@ struct BlockDriver {
void (*bdrv_invalidate_cache)(BlockDriverState *bs, Error **errp);
int (*bdrv_inactivate)(BlockDriverState *bs);
/*
* Flushes all data for all layers by calling bdrv_co_flush for underlying
* layers, if needed. This function is needed for deterministic
* synchronization of the flush finishing callback.
*/
int coroutine_fn (*bdrv_co_flush)(BlockDriverState *bs);
/*
* Flushes all data that was already written to the OS all the way down to
* the disk (for example raw-posix calls fsync()).