@@ -1456,6 +1456,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
QEMUOptionParameter *options, int version,
Error **errp)
{
+ QEMUOptionParameter *alloc_options = NULL;
/* Calculate cluster_bits */
int cluster_bits;
cluster_bits = ffs(cluster_size) - 1;
@@ -1485,16 +1486,80 @@ static int qcow2_create2(const char *filename, int64_t total_size,
Error *local_err = NULL;
int ret;
+ if (prealloc == PREALLOC_MODE_FULL) {
+ int64_t meta_size = 0;
+ unsigned nreftablee, nrefblocke, nl1e, nl2e;
+ BlockDriver *drv;
+
+ total_size = align_offset(total_size, cluster_size);
+
+ drv = bdrv_find_protocol(filename, true);
+ if (drv == NULL) {
+ error_setg(errp, "Could not find protocol for file '%s'", filename);
+ return -ENOENT;
+ }
+
+ alloc_options = append_option_parameters(alloc_options,
+ drv->create_options);
+ alloc_options = append_option_parameters(alloc_options, options);
+
+ /* header: 1 cluster */
+ meta_size += cluster_size;
+
+ /* total size of L2 tables */
+ nl2e = total_size / cluster_size;
+ nl2e = align_offset(nl2e, cluster_size / sizeof(uint64_t));
+ meta_size += nl2e * sizeof(uint64_t);
+
+ /* total size of L1 tables */
+ nl1e = nl2e * sizeof(uint64_t) / cluster_size;
+ nl1e = align_offset(nl1e, cluster_size / sizeof(uint64_t));
+ meta_size += nl1e * sizeof(uint64_t);
+
+ /* total size of refcount blocks
+ *
+ * note: every host cluster is reference-counted, including metadata
+ * (even refcount blocks are recursively included).
+ * Let:
+ * a = total_size (this is the guest disk size)
+ * m = meta size not including refcount blocks and refcount tables
+ * c = cluster size
+ * y1 = number of refcount blocks entries
+ * y2 = meta size including everything
+ * then,
+ * y1 = (y2 + a)/c
+ * y2 = y1 * sizeof(u16) + y1 * sizeof(u16) * sizeof(u64) / c + m
+ * we can get y1:
+ * y1 = (a + m) / (c - sizeof(u16) - sizeof(u16) * sizeof(u64) / c)
+ */
+ nrefblocke = (total_size + meta_size + cluster_size) /
+ (cluster_size - sizeof(uint16_t) -
+ 1.0 * sizeof(uint16_t) * sizeof(uint64_t) / cluster_size);
+ nrefblocke = align_offset(nrefblocke, cluster_size / sizeof(uint16_t));
+ meta_size += nrefblocke * sizeof(uint16_t);
+
+ /* total size of refcount tables */
+ nreftablee = nrefblocke * sizeof(uint16_t) / cluster_size;
+ nreftablee = align_offset(nreftablee, cluster_size / sizeof(uint64_t));
+ meta_size += nreftablee * sizeof(uint64_t);
+
+ set_option_parameter_int(alloc_options, BLOCK_OPT_SIZE,
+ total_size + meta_size);
+ set_option_parameter(alloc_options, BLOCK_OPT_PREALLOC, "full");
+
+ options = alloc_options;
+ }
+
ret = bdrv_create_file(filename, options, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
- return ret;
+ goto out_options;
}
ret = bdrv_file_open(&bs, filename, NULL, NULL, BDRV_O_RDWR, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
- return ret;
+ goto out_options;
}
/* Write the header */
@@ -1611,6 +1676,8 @@ static int qcow2_create2(const char *filename, int64_t total_size,
ret = 0;
out:
bdrv_unref(bs);
+out_options:
+ free_option_parameters(alloc_options);
return ret;
}
@@ -1646,6 +1713,8 @@ static int qcow2_create(const char *filename, QEMUOptionParameter *options,
prealloc = PREALLOC_MODE_OFF;
} else if (!strcmp(options->value.s, "metadata")) {
prealloc = PREALLOC_MODE_METADATA;
+ } else if (!strcmp(options->value.s, "full")) {
+ prealloc = PREALLOC_MODE_FULL;
} else {
error_setg(errp, "Invalid preallocation mode: '%s'",
options->value.s);
@@ -2211,7 +2280,7 @@ static QEMUOptionParameter qcow2_create_options[] = {
{
.name = BLOCK_OPT_PREALLOC,
.type = OPT_STRING,
- .help = "Preallocation mode (allowed values: off, metadata)"
+ .help = "Preallocation mode (allowed values: off, metadata, full)"
},
{
.name = BLOCK_OPT_LAZY_REFCOUNTS,