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| 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-snapshot.c | |
| parent | 70a5ff6bdd2f0d4c22e216cab921f9288cb1656e (diff) | |
| download | qemu-808c4b6f30d77295292cef8ee38c462957a6b9ca.tar.gz qemu-808c4b6f30d77295292cef8ee38c462957a6b9ca.tar.bz2 qemu-808c4b6f30d77295292cef8ee38c462957a6b9ca.zip | |
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.c | 2 |
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 { |