diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2019-02-22 14:29:38 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2019-03-08 12:26:46 +0100 |
| commit | 6c3944dc6219cefef6a968cf300d227fe3f92388 (patch) | |
| tree | a29c719a0dd5e302ee767a839512cd388d940f93 /block/qcow2-cluster.c | |
| parent | 9b890bdcb6ec11868da92c1daeb51c69d9483da8 (diff) | |
qcow2: Implement data-file-raw create option
Provide an option to force QEMU to always keep the external data file
consistent as a standalone read-only raw image.
At the moment, this means making sure that write_zeroes requests are
forwarded to the data file instead of just updating the metadata, and
checking that no backing file is used.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow2-cluster.c')
| -rw-r--r-- | block/qcow2-cluster.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 7579f5a5ae..974a4e8656 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1783,6 +1783,16 @@ int qcow2_cluster_zeroize(BlockDriverState *bs, uint64_t offset, int64_t cleared; int ret; + /* If we have to stay in sync with an external data file, zero out + * s->data_file first. */ + if (data_file_is_raw(bs)) { + assert(has_data_file(bs)); + ret = bdrv_co_pwrite_zeroes(s->data_file, offset, bytes, flags); + if (ret < 0) { + return ret; + } + } + /* Caller must pass aligned values, except at image end */ assert(QEMU_IS_ALIGNED(offset, s->cluster_size)); assert(QEMU_IS_ALIGNED(end_offset, s->cluster_size) || |