@@ -3080,6 +3080,10 @@
# encrypted images, except when doing a metadata-only
# probe of the image. (since 2.10)
#
+# @data-file: reference to or definition of the external data file.
+# This may only be specified for images that require an
+# external data file. (since 4.0)
+#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsQcow2',
@@ -3094,7 +3098,8 @@
'*l2-cache-entry-size': 'int',
'*refcount-cache-size': 'int',
'*cache-clean-interval': 'int',
- '*encrypt': 'BlockdevQcow2Encryption' } }
+ '*encrypt': 'BlockdevQcow2Encryption',
+ '*data-file': 'BlockdevRef' } }
##
# @SshHostKeyCheckMode:
@@ -91,6 +91,7 @@
#define DEFAULT_CLUSTER_SIZE 65536
+#define QCOW2_OPT_DATA_FILE "data-file"
#define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts"
#define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request"
#define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot"
@@ -205,7 +206,8 @@ enum {
QCOW2_INCOMPAT_DATA_FILE = 1 << QCOW2_INCOMPAT_DATA_FILE_BITNR,
QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY
- | QCOW2_INCOMPAT_CORRUPT,
+ | QCOW2_INCOMPAT_CORRUPT
+ | QCOW2_INCOMPAT_DATA_FILE,
};
/* Compatible feature bits */
@@ -1441,8 +1441,31 @@ 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
@@ -1615,6 +1638,9 @@ 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);
@@ -2234,6 +2260,10 @@ 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);
}
This adds a .bdrv_open option to specify the external data file node. Signed-off-by: Kevin Wolf <kwolf@redhat.com> --- qapi/block-core.json | 7 ++++++- block/qcow2.h | 4 +++- block/qcow2.c | 34 ++++++++++++++++++++++++++++++++-- 3 files changed, 41 insertions(+), 4 deletions(-)