Signed-off-by: Devin Nakamura <devin...@gmail.com> --- block/qcow2.c | 36 ++++++++++++++++++++++++++++++++++++ 1 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/block/qcow2.c b/block/qcow2.c index 48e1b95..05ea40c 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1340,6 +1340,40 @@ static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, return ret; } +static int qcow2_get_mapping(BlockDriverState *bs, uint64_t *guest_offset, + uint64_t *host_offset, uint64_t *contiguous_bytes) +{ + uint64_t cluster_offset, pos; + //BDRVQcowState *s = bs->opaque; + int ret, count; + pos = *guest_offset + *contiguous_bytes; + + if (pos >= bs->total_sectors << BDRV_SECTOR_BITS) { + *contiguous_bytes = 0; + return 0; + } + count = 0; + do { + pos += count << BDRV_SECTOR_BITS; + count = INT_MAX; + ret = qcow2_get_cluster_offset(bs, pos, &count, &cluster_offset); + if (ret) { + *contiguous_bytes = 0; + return ret; + } + } while (!cluster_offset && pos < bs->total_sectors * BDRV_SECTOR_SIZE); + + if (pos >= bs->total_sectors << BDRV_SECTOR_BITS || !cluster_offset) { + *contiguous_bytes = 0; + return 0; + } + + *contiguous_bytes = count << BDRV_SECTOR_BITS; + *guest_offset = pos; + *host_offset = cluster_offset; + return 0; +} + static QEMUOptionParameter qcow2_create_options[] = { { .name = BLOCK_OPT_SIZE, @@ -1409,6 +1443,8 @@ static BlockDriver bdrv_qcow2 = { .create_options = qcow2_create_options, .bdrv_check = qcow2_check, + + .bdrv_get_mapping = qcow2_get_mapping, }; static void bdrv_qcow2_init(void) -- 1.7.6.rc1