diff options
| author | Stefan Hajnoczi <stefanha@redhat.com> | 2017-05-22 14:57:01 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2017-06-26 14:51:13 +0200 |
| commit | dc88a467ec7214c3086094033daf2aba554337b1 (patch) | |
| tree | fdf50888939286f3c8b67d851ff2a41f104ed839 /block/io.c | |
| parent | 24575bfa8c05041db097d203c5506814db0fa110 (diff) | |
| download | qemu-dc88a467ec7214c3086094033daf2aba554337b1.tar.gz | |
block: count bdrv_co_rw_vmstate() requests
Call bdrv_inc/dec_in_flight() for vmstate reads/writes. This seems
unnecessary at first glance because vmstate reads/writes are done
synchronously while the guest is stopped. But we need the bdrv_wakeup()
in bdrv_dec_in_flight() so the main loop sees request completion.
Besides, it's cleaner to count vmstate reads/writes like ordinary
read/write requests.
The bdrv_wakeup() partially fixes a 'savevm' hang with -object iothread.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/io.c')
| -rw-r--r-- | block/io.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/block/io.c b/block/io.c index 91611ffb2a..684ea465c7 100644 --- a/block/io.c +++ b/block/io.c @@ -1980,17 +1980,24 @@ bdrv_co_rw_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos, bool is_read) { BlockDriver *drv = bs->drv; + int ret = -ENOTSUP; + + bdrv_inc_in_flight(bs); if (!drv) { - return -ENOMEDIUM; + ret = -ENOMEDIUM; } else if (drv->bdrv_load_vmstate) { - return is_read ? drv->bdrv_load_vmstate(bs, qiov, pos) - : drv->bdrv_save_vmstate(bs, qiov, pos); + if (is_read) { + ret = drv->bdrv_load_vmstate(bs, qiov, pos); + } else { + ret = drv->bdrv_save_vmstate(bs, qiov, pos); + } } else if (bs->file) { - return bdrv_co_rw_vmstate(bs->file->bs, qiov, pos, is_read); + ret = bdrv_co_rw_vmstate(bs->file->bs, qiov, pos, is_read); } - return -ENOTSUP; + bdrv_dec_in_flight(bs); + return ret; } static void coroutine_fn bdrv_co_rw_vmstate_entry(void *opaque) |