int qcow2_check_metadata_overlap(BlockDriverState *bs, int chk, int64_t offset, int64_t size) { BDRVQcowState *s = bs->opaque; int i, j; if (!size) { return 0; } if (chk & QCOW2_OL_MAIN_HEADER) { if (offset < s->cluster_size) { return QCOW2_OL_MAIN_HEADER; } } /* align range to test to cluster boundaries */ size = align_offset(offset_into_cluster(s, offset) + size, s->cluster_size); offset = start_of_cluster(s, offset); if ((chk & QCOW2_OL_ACTIVE_L1) && s->l1_size) { if (overlaps_with(s->l1_table_offset, s->l1_size * sizeof(uint64_t))) { return QCOW2_OL_ACTIVE_L1; } } if ((chk & QCOW2_OL_REFCOUNT_TABLE) && s->refcount_table_size) { if (overlaps_with(s->refcount_table_offset, s->refcount_table_size * sizeof(uint64_t))) { return QCOW2_OL_REFCOUNT_TABLE; } } if ((chk & QCOW2_OL_SNAPSHOT_TABLE) && s->snapshots_size) { if (overlaps_with(s->snapshots_offset, s->snapshots_size)) { return QCOW2_OL_SNAPSHOT_TABLE; } } if ((chk & QCOW2_OL_INACTIVE_L1) && s->snapshots) { for (i = 0; i < s->nb_snapshots; i++) { if (s->snapshots[i].l1_size && overlaps_with(s->snapshots[i].l1_table_offset, s->snapshots[i].l1_size * sizeof(uint64_t))) { return QCOW2_OL_INACTIVE_L1; } } } if ((chk & QCOW2_OL_ACTIVE_L2) && s->l1_table) { for (i = 0; i < s->l1_size; i++) { if ((s->l1_table[i] & L1E_OFFSET_MASK) && overlaps_with(s->l1_table[i] & L1E_OFFSET_MASK, s->cluster_size)) { return QCOW2_OL_ACTIVE_L2; } } } if ((chk & QCOW2_OL_REFCOUNT_BLOCK) && s->refcount_table) { for (i = 0; i < s->refcount_table_size; i++) { if ((s->refcount_table[i] & REFT_OFFSET_MASK) && overlaps_with(s->refcount_table[i] & REFT_OFFSET_MASK, s->cluster_size)) { return QCOW2_OL_REFCOUNT_BLOCK; } } } if ((chk & QCOW2_OL_INACTIVE_L2) && s->snapshots) { for (i = 0; i < s->nb_snapshots; i++) { uint64_t l1_ofs = s->snapshots[i].l1_table_offset; uint32_t l1_sz = s->snapshots[i].l1_size; uint64_t l1_sz2 = l1_sz * sizeof(uint64_t); uint64_t *l1 = g_malloc(l1_sz2); int ret; ret = bdrv_pread(bs->file, l1_ofs, l1, l1_sz2); if (ret < 0) { g_free(l1); return ret; } for (j = 0; j < l1_sz; j++) { uint64_t l2_ofs = be64_to_cpu(l1[j]) & L1E_OFFSET_MASK; if (l2_ofs && overlaps_with(l2_ofs, s->cluster_size)) { g_free(l1); return QCOW2_OL_INACTIVE_L2; } } g_free(l1); } } return 0; }