diff options
| author | Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> | 2016-03-14 10:44:53 +0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2016-03-30 12:12:15 +0200 |
| commit | c32b82afaf261ebb922269e2be298e05331b875c (patch) | |
| tree | f5d79b9fa15f7919b2361284fd42d3d83e3f7b94 /block | |
| parent | 6278ae035fbd4bbab6a43cd53e4bf3bb71debc71 (diff) | |
| download | qemu-c32b82afaf261ebb922269e2be298e05331b875c.tar.gz | |
block: add flush callback
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/io.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/block/io.c b/block/io.c index 4520cab852..c8f5401076 100644 --- a/block/io.c +++ b/block/io.c @@ -2333,6 +2333,13 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs) } tracked_request_begin(&req, bs, 0, 0, BDRV_TRACKED_FLUSH); + + /* Write back all layers by calling one driver function */ + if (bs->drv->bdrv_co_flush) { + ret = bs->drv->bdrv_co_flush(bs); + goto out; + } + /* Write back cached data to the OS even with cache=unsafe */ BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); if (bs->drv->bdrv_co_flush_to_os) { |