diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2019-01-14 16:48:25 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2019-03-08 12:26:45 +0100 |
| commit | 93c2493646a063a0b0660b47647badf3c43108c7 (patch) | |
| tree | 47bb052b0fb917060f6d83bd49217c24273161ea /block/qcow2.c | |
| parent | 65a3d073e9766ed878474525118dbf0c7233caab (diff) | |
qcow2: Basic definitions for external data files
This adds basic constants, struct fields and helper function for
external data file support to the implementation.
QCOW2_INCOMPAT_MASK and QCOW2_AUTOCLEAR_MASK are not updated yet so that
opening images with an external data file still fails (we don't handle
them correctly yet).
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index 9489d795e5..59cf706dc2 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -73,6 +73,7 @@ typedef struct { #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 #define QCOW2_EXT_MAGIC_CRYPTO_HEADER 0x0537be77 #define QCOW2_EXT_MAGIC_BITMAPS 0x23852875 +#define QCOW2_EXT_MAGIC_DATA_FILE 0x44415441 static int coroutine_fn qcow2_co_preadv_compressed(BlockDriverState *bs, @@ -1452,6 +1453,9 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, goto fail; } + /* TODO Open external data file */ + 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 * don't need header extensions, so must check here @@ -2441,6 +2445,11 @@ int qcow2_update_header(BlockDriverState *bs) .name = "corrupt bit", }, { + .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, + .bit = QCOW2_INCOMPAT_DATA_FILE_BITNR, + .name = "external data file", + }, + { .type = QCOW2_FEAT_TYPE_COMPATIBLE, .bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, .name = "lazy refcounts", |