diff options
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index f048763..ddbf873 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1453,8 +1453,31 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, goto fail; } - /* TODO Open external data file */ - s->data_file = bs->file; + /* Open external data file */ + s->data_file = bdrv_open_child(NULL, options, "data-file", bs, &child_file, + true, &local_err); + if (local_err) { + error_propagate(errp, local_err); + ret = -EINVAL; + goto fail; + } + + if (s->incompatible_features & QCOW2_INCOMPAT_DATA_FILE) { + if (!s->data_file) { + error_setg(errp, "'data-file' is required for this image"); + ret = -EINVAL; + goto fail; + } + } else { + if (s->data_file) { + error_setg(errp, "'data-file' can only be set for images with an " + "external data file"); + ret = -EINVAL; + goto fail; + } else { + s->data_file = bs->file; + } + } /* qcow2_read_extension may have set up the crypto context * if the crypt method needs a header region, some methods @@ -1627,6 +1650,9 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, return ret; fail: + if (has_data_file(bs)) { + bdrv_unref_child(bs, s->data_file); + } g_free(s->unknown_header_fields); cleanup_unknown_header_ext(bs); qcow2_free_snapshots(bs); @@ -2246,6 +2272,10 @@ static void qcow2_close(BlockDriverState *bs) g_free(s->image_backing_file); g_free(s->image_backing_format); + if (has_data_file(bs)) { + bdrv_unref_child(bs, s->data_file); + } + qcow2_refcount_close(bs); qcow2_free_snapshots(bs); } |