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block: Use CAF in bdrv_co_rw_vmstate()

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If a node whose driver does not provide VM state functions has a
metadata child, the VM state should probably go there; if it is a
filter, the VM state should probably go there.  It follows that we
should generally go down to the primary child.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2019-06-12 18:17:06 +02:00 committed by Kevin Wolf
parent 52f72d6fb6
commit c4db2e25df
1 changed files with 3 additions and 2 deletions
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5
block/io.c
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@ -2648,6 +2648,7 @@ bdrv_co_rw_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos,
bool is_read)
{
BlockDriver *drv = bs->drv;
BlockDriverState *child_bs = bdrv_primary_bs(bs);
int ret = -ENOTSUP;
bdrv_inc_in_flight(bs);
@ -2660,8 +2661,8 @@ bdrv_co_rw_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos,
} else {
ret = drv->bdrv_save_vmstate(bs, qiov, pos);
}
} else if (bs->file) {
ret = bdrv_co_rw_vmstate(bs->file->bs, qiov, pos, is_read);
} else if (child_bs) {
ret = bdrv_co_rw_vmstate(child_bs, qiov, pos, is_read);
}
bdrv_dec_in_flight(bs);