Commit df2a6f29 authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Stefan Hajnoczi
Browse files

block: keep bs->total_sectors up to date even for growable block devices 



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: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
parent e641c1e8

block.c

+4 −1
Original line number Diff line number Diff line
@@ -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);

        }