static int qcow2_cache_entry_flush(BlockDriverState *bs, Qcow2Cache *c, int i) { BDRVQcowState *s = bs->opaque; int ret = 0; if (!c->entries[i].dirty || !c->entries[i].offset) { return 0; } trace_qcow2_cache_entry_flush(qemu_coroutine_self(), c == s->l2_table_cache, i); if (c->depends) { ret = qcow2_cache_flush_dependency(bs, c); } else if (c->depends_on_flush) { ret = bdrv_flush(bs->file); if (ret >= 0) { c->depends_on_flush = false; } } if (ret < 0) { return ret; } if (c == s->refcount_block_cache) { ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT & ~QCOW2_OL_REFCOUNT_BLOCK, c->entries[i].offset, s->cluster_size); } else if (c == s->l2_table_cache) { ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT & ~QCOW2_OL_ACTIVE_L2, c->entries[i].offset, s->cluster_size); } else { ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, c->entries[i].offset, s->cluster_size); } if (ret < 0) { return ret; } if (c == s->refcount_block_cache) { BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_UPDATE_PART); } else if (c == s->l2_table_cache) { BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE); } ret = bdrv_pwrite(bs->file, c->entries[i].offset, c->entries[i].table, s->cluster_size); if (ret < 0) { return ret; } c->entries[i].dirty = false; return 0; }