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.h | |
| 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.h')
| -rw-r--r-- | block/qcow2.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/block/qcow2.h b/block/qcow2.h index a9c9cb4a26..de2a3bdfc5 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -225,7 +225,8 @@ enum { QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR, QCOW2_AUTOCLEAR_DATA_FILE_RAW = 1 << QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR, - QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS, + QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS + | QCOW2_AUTOCLEAR_DATA_FILE_RAW, }; enum qcow2_discard_type { @@ -474,6 +475,12 @@ static inline bool has_data_file(BlockDriverState *bs) return (s->data_file != bs->file); } +static inline bool data_file_is_raw(BlockDriverState *bs) +{ + BDRVQcow2State *s = bs->opaque; + return !!(s->autoclear_features & QCOW2_AUTOCLEAR_DATA_FILE_RAW); +} + static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset) { return offset & ~(s->cluster_size - 1); |