diff options
| -rw-r--r-- | block/qcow2.c | 34 | ||||
| -rw-r--r-- | block/qcow2.h | 4 | ||||
| -rw-r--r-- | qapi/block-core.json | 7 |
3 files changed, 41 insertions, 4 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); } diff --git a/block/qcow2.h b/block/qcow2.h index aac7fc4..f23c003 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -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 */ diff --git a/qapi/block-core.json b/qapi/block-core.json index 2b8afbb..de4d4fd 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -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: |