static int qcow_write_snapshots(BlockDriverState *bs) { BDRVQcowState *s = bs->opaque; QCowSnapshot *sn; QCowSnapshotHeader h; int i, name_size, id_str_size, snapshots_size; uint64_t data64; uint32_t data32; int64_t offset, snapshots_offset; /* compute the size of the snapshots */ offset = 0; for(i = 0; i < s->nb_snapshots; i++) { sn = s->snapshots + i; offset = align_offset(offset, 8); offset += sizeof(h); offset += strlen(sn->id_str); offset += strlen(sn->name); } snapshots_size = offset; snapshots_offset = qcow2_alloc_clusters(bs, snapshots_size); offset = snapshots_offset; if (offset < 0) { return offset; } for(i = 0; i < s->nb_snapshots; i++) { sn = s->snapshots + i; memset(&h, 0, sizeof(h)); h.l1_table_offset = cpu_to_be64(sn->l1_table_offset); h.l1_size = cpu_to_be32(sn->l1_size); h.vm_state_size = cpu_to_be32(sn->vm_state_size); h.date_sec = cpu_to_be32(sn->date_sec); h.date_nsec = cpu_to_be32(sn->date_nsec); h.vm_clock_nsec = cpu_to_be64(sn->vm_clock_nsec); id_str_size = strlen(sn->id_str); name_size = strlen(sn->name); h.id_str_size = cpu_to_be16(id_str_size); h.name_size = cpu_to_be16(name_size); offset = align_offset(offset, 8); if (bdrv_pwrite(bs->file, offset, &h, sizeof(h)) != sizeof(h)) goto fail; offset += sizeof(h); if (bdrv_pwrite(bs->file, offset, sn->id_str, id_str_size) != id_str_size) goto fail; offset += id_str_size; if (bdrv_pwrite(bs->file, offset, sn->name, name_size) != name_size) goto fail; offset += name_size; } /* update the various header fields */ data64 = cpu_to_be64(snapshots_offset); if (bdrv_pwrite(bs->file, offsetof(QCowHeader, snapshots_offset), &data64, sizeof(data64)) != sizeof(data64)) goto fail; data32 = cpu_to_be32(s->nb_snapshots); if (bdrv_pwrite(bs->file, offsetof(QCowHeader, nb_snapshots), &data32, sizeof(data32)) != sizeof(data32)) goto fail; /* free the old snapshot table */ qcow2_free_clusters(bs, s->snapshots_offset, s->snapshots_size); s->snapshots_offset = snapshots_offset; s->snapshots_size = snapshots_size; return 0; fail: return -1; }