Signed-off-by: Devin Nakamura <devin...@gmail.com>
---
block/qcow2.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 54 insertions(+), 0 deletions(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index b75364d..3bb28d2 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1374,6 +1374,59 @@ static int qcow2_get_mapping(BlockDriverState *bs,
uint64_t *guest_offset,
return 0;
}
+static int qcow2_copy_header(BlockDriverState *bs)
+{
+ BlockDriverState *backup;
+ uint8_t buffer[512];
+ int ret;
+ QCowHeader header;
+ BDRVQcowState *s = bs->opaque;
+ ret = qcow2_cache_flush(bs, s->l2_table_cache);
+ if (ret) {
+ return ret;
+ }
+
+ /*TODO: change filename*/
+ bdrv_create_file("headerbackup.temp", NULL);
+ bdrv_file_open(&backup, "headerbackup.temp", BDRV_O_RDWR);
+ bdrv_read(bs->file, 0, buffer, 1); /*TODO: check return code*/
+ bdrv_write(backup, 0, buffer, 1); /*TODO: check return code*/
+ bdrv_close(backup);
+
+ header.magic = QCOW_MAGIC;
+ header.version = 2;
+ header.backing_file_offset = 0;
+ header.backing_file_size = 0;
+ header.size = bs->total_sectors << BDRV_SECTOR_BITS;
+ header.cluster_bits = s->cluster_bits;
+ header.crypt_method = QCOW_CRYPT_NONE;
+ header.l1_table_offset = s->l1_table_offset;
+ header.l1_size = s->l1_size;
+ header.refcount_table_offset = s->refcount_table_offset;
+ header.refcount_table_clusters = s->refcount_table_size; /*TODO: FIXME*/
+ header.snapshots_offset = s->snapshots_offset;
+ header.nb_snapshots = s->nb_snapshots;
+
+ cpu_to_be64s(&header.backing_file_offset);
+ cpu_to_be32s(&header.backing_file_size);
+ cpu_to_be32s(&header.cluster_bits);
+ cpu_to_be32s(&header.crypt_method);
+ cpu_to_be32s(&header.l1_size);
+ cpu_to_be64s(&header.l1_table_offset);
+ cpu_to_be32s(&header.magic);
+ cpu_to_be32s(&header.nb_snapshots);
+ cpu_to_be32s(&header.refcount_table_clusters);
+ cpu_to_be64s(&header.refcount_table_offset);
+ cpu_to_be64s(&header.size);
+ cpu_to_be64s(&header.snapshots_offset);
+ cpu_to_be32s(&header.version);
+ ret = bdrv_pwrite_sync(bs->file, 0, &header, sizeof(QCowHeader));
+ if (ret) {
+ return ret;
+ }
+ return qcow2_drop_leaked_clusters(bs);
+}
+
static QEMUOptionParameter qcow2_create_options[] = {
{
.name = BLOCK_OPT_SIZE,
@@ -1446,6 +1499,7 @@ static BlockDriver bdrv_qcow2 = {
.bdrv_get_mapping = qcow2_get_mapping,
.bdrv_map = qcow2_map,
+ .bdrv_copy_header = qcow2_copy_header,
};
static void bdrv_qcow2_init(void)
--
1.7.6.rc1
