diff options
| author | Max Reitz <mreitz@redhat.com> | 2014-10-24 15:57:30 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-11-03 11:41:47 +0000 |
| commit | 808c4b6f30d77295292cef8ee38c462957a6b9ca (patch) | |
| tree | 33cf36fdaca45cfee3affc1fe999085ccf6bf44e /block/qcow2.c | |
| parent | 70a5ff6bdd2f0d4c22e216cab921f9288cb1656e (diff) | |
qcow2: Allow "full" discard
Normally, discarded sectors should read back as zero. However, there are
cases in which a sector (or rather cluster) should be discarded as if
they were never written in the first place, that is, reading them should
fall through to the backing file again.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 1414159063-25977-2-git-send-email-mreitz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index d031515838..d64a4bab3d 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2089,7 +2089,7 @@ static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, qemu_co_mutex_lock(&s->lock); ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, - nb_sectors, QCOW2_DISCARD_REQUEST); + nb_sectors, QCOW2_DISCARD_REQUEST, false); qemu_co_mutex_unlock(&s->lock); return ret; } |