aboutsummaryrefslogtreecommitdiff
path: root/block/qcow2-snapshot.c
diff options
context:
space:
mode:
authorMax Reitz <mreitz@redhat.com>2014-10-24 15:57:30 +0200
committerStefan Hajnoczi <stefanha@redhat.com>2014-11-03 11:41:47 +0000
commit808c4b6f30d77295292cef8ee38c462957a6b9ca (patch)
tree33cf36fdaca45cfee3affc1fe999085ccf6bf44e /block/qcow2-snapshot.c
parent70a5ff6bdd2f0d4c22e216cab921f9288cb1656e (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-snapshot.c')
-rw-r--r--block/qcow2-snapshot.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index f52d7fdd22..5b3903cf22 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -441,7 +441,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
qcow2_discard_clusters(bs, qcow2_vm_state_offset(s),
align_offset(sn->vm_state_size, s->cluster_size)
>> BDRV_SECTOR_BITS,
- QCOW2_DISCARD_NEVER);
+ QCOW2_DISCARD_NEVER, false);
#ifdef DEBUG_ALLOC
{