From: Paolo Bonzini <pbonz...@redhat.com> If a BlockDriverState is growable, after every write we need to check if bs->total_sectors might have changed. With this change, bdrv_getlength does not need anymore a system call.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com> --- block.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/block.c b/block.c index 905bf34..d9a3a7f 100644 --- a/block.c +++ b/block.c @@ -2739,6 +2739,9 @@ static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { bs->wr_highest_sector = sector_num + nb_sectors - 1; } + if (bs->growable && ret >= 0) { + bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); + } tracked_request_end(&req); @@ -2813,7 +2816,7 @@ int64_t bdrv_getlength(BlockDriverState *bs) if (!drv) return -ENOMEDIUM; - if (bs->growable || bdrv_dev_has_removable_media(bs)) { + if (bdrv_dev_has_removable_media(bs)) { if (drv->bdrv_getlength) { return drv->bdrv_getlength(bs); } -- 1.8.3.1