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.h | |
| 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.h')
| -rw-r--r-- | block/qcow2.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2.h b/block/qcow2.h index 577ccd1bf0..886b25b7e0 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -534,7 +534,7 @@ uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs, int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m); int qcow2_discard_clusters(BlockDriverState *bs, uint64_t offset, - int nb_sectors, enum qcow2_discard_type type); + int nb_sectors, enum qcow2_discard_type type, bool full_discard); int qcow2_zero_clusters(BlockDriverState *bs, uint64_t offset, int nb_sectors); int qcow2_expand_zero_clusters(BlockDriverState *bs); |