change block layer to support both QemuOpts and QEMUOptionParamter

Change block layer to support both QemuOpts and QEMUOptionParameter.
After this patch, it will change backend drivers one by one. At the end,
QEMUOptionParameter will be removed and only QemuOpts is kept.

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 111 insertions, 49 deletions

diff --git a/block.c b/block.c
index 17f763d..3dd2194 100644
--- a/block.c
+++ b/block.c
@@ -329,6 +329,13 @@ void bdrv_register(BlockDriver *bdrv)
         }
     }
 
+    if (bdrv->bdrv_create) {
+        assert(!bdrv->bdrv_create2 && !bdrv->create_opts);
+        assert(!bdrv->bdrv_amend_options2);
+    } else if (bdrv->bdrv_create2) {
+        assert(!bdrv->bdrv_create && !bdrv->create_options);
+        assert(!bdrv->bdrv_amend_options);
+    }
     QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
 }
 
@@ -425,6 +432,7 @@ typedef struct CreateCo {
     BlockDriver *drv;
     char *filename;
     QEMUOptionParameter *options;
+    QemuOpts *opts;
     int ret;
     Error *err;
 } CreateCo;
@@ -436,8 +444,28 @@ static void coroutine_fn bdrv_create_co_entry(void *opaque)
 
     CreateCo *cco = opaque;
     assert(cco->drv);
+    assert(!(cco->options && cco->opts));
 
-    ret = cco->drv->bdrv_create(cco->filename, cco->options, &local_err);
+    if (cco->drv->bdrv_create2) {
+        QemuOptsList *opts_list = NULL;
+        if (cco->options) {
+            opts_list = params_to_opts(cco->options);
+            cco->opts = qemu_opts_create(opts_list, NULL, 0, &error_abort);
+        }
+        ret = cco->drv->bdrv_create2(cco->filename, cco->opts, &local_err);
+        if (cco->options) {
+            qemu_opts_del(cco->opts);
+            qemu_opts_free(opts_list);
+        }
+    } else {
+        if (cco->opts) {
+            cco->options = opts_to_params(cco->opts);
+        }
+        ret = cco->drv->bdrv_create(cco->filename, cco->options, &local_err);
+        if (cco->opts) {
+            free_option_parameters(cco->options);
+        }
+    }
     if (local_err) {
         error_propagate(&cco->err, local_err);
     }
@@ -445,7 +473,8 @@ static void coroutine_fn bdrv_create_co_entry(void *opaque)
 }
 
 int bdrv_create(BlockDriver *drv, const char* filename,
-    QEMUOptionParameter *options, Error **errp)
+                QEMUOptionParameter *options,
+                QemuOpts *opts, Error **errp)
 {
     int ret;
 
@@ -454,11 +483,12 @@ int bdrv_create(BlockDriver *drv, const char* filename,
         .drv = drv,
         .filename = g_strdup(filename),
         .options = options,
+        .opts = opts,
         .ret = NOT_DONE,
         .err = NULL,
     };
 
-    if (!drv->bdrv_create) {
+    if (!drv->bdrv_create && !drv->bdrv_create2) {
         error_setg(errp, "Driver '%s' does not support image creation", drv->format_name);
         ret = -ENOTSUP;
         goto out;
@@ -490,7 +520,7 @@ out:
 }
 
 int bdrv_create_file(const char* filename, QEMUOptionParameter *options,
-                     Error **errp)
+                     QemuOpts *opts, Error **errp)
 {
     BlockDriver *drv;
     Error *local_err = NULL;
@@ -502,7 +532,7 @@ int bdrv_create_file(const char* filename, QEMUOptionParameter *options,
         return -ENOENT;
     }
 
-    ret = bdrv_create(drv, filename, options, &local_err);
+    ret = bdrv_create(drv, filename, options, opts, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
     }
@@ -1247,7 +1277,8 @@ void bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp)
     char *tmp_filename = g_malloc0(PATH_MAX + 1);
     int64_t total_size;
     BlockDriver *bdrv_qcow2;
-    QEMUOptionParameter *create_options;
+    QemuOptsList *create_opts = NULL;
+    QemuOpts *opts = NULL;
     QDict *snapshot_options;
     BlockDriverState *bs_snapshot;
     Error *local_err;
@@ -1272,13 +1303,20 @@ void bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp)
     }
 
     bdrv_qcow2 = bdrv_find_format("qcow2");
-    create_options = parse_option_parameters("", bdrv_qcow2->create_options,
-                                             NULL);
-
-    set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size);
 
-    ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options, &local_err);
-    free_option_parameters(create_options);
+    assert(!(bdrv_qcow2->create_options && bdrv_qcow2->create_opts));
+    if (bdrv_qcow2->create_options) {
+        create_opts = params_to_opts(bdrv_qcow2->create_options);
+    } else {
+        create_opts = bdrv_qcow2->create_opts;
+    }
+    opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
+    qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size);
+    ret = bdrv_create(bdrv_qcow2, tmp_filename, NULL, opts, &local_err);
+    qemu_opts_del(opts);
+    if (bdrv_qcow2->create_options) {
+        qemu_opts_free(create_opts);
+    }
     if (ret < 0) {
         error_setg_errno(errp, -ret, "Could not create temporary overlay "
                          "'%s': %s", tmp_filename,
@@ -5519,8 +5557,10 @@ void bdrv_img_create(const char *filename, const char *fmt,
                      char *options, uint64_t img_size, int flags,
                      Error **errp, bool quiet)
 {
-    QEMUOptionParameter *param = NULL, *create_options = NULL;
-    QEMUOptionParameter *backing_fmt, *backing_file, *size;
+    QemuOptsList *create_opts = NULL;
+    QemuOpts *opts = NULL;
+    const char *backing_fmt, *backing_file;
+    int64_t size;
     BlockDriver *drv, *proto_drv;
     BlockDriver *backing_drv = NULL;
     Error *local_err = NULL;
@@ -5539,28 +5579,25 @@ void bdrv_img_create(const char *filename, const char *fmt,
         return;
     }
 
-    create_options = append_option_parameters(create_options,
-                                              drv->create_options);
-    create_options = append_option_parameters(create_options,
-                                              proto_drv->create_options);
+    create_opts = qemu_opts_append(create_opts, drv->create_opts,
+                                   drv->create_options);
+    create_opts = qemu_opts_append(create_opts, proto_drv->create_opts,
+                                   proto_drv->create_options);
 
     /* Create parameter list with default values */
-    param = parse_option_parameters("", create_options, param);
-
-    set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size);
+    opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
+    qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size);
 
     /* Parse -o options */
     if (options) {
-        param = parse_option_parameters(options, create_options, param);
-        if (param == NULL) {
-            error_setg(errp, "Invalid options for file format '%s'.", fmt);
+        if (qemu_opts_do_parse(opts, options, NULL) != 0) {
+            error_setg(errp, "Invalid options for file format '%s'", fmt);
             goto out;
         }
     }
 
     if (base_filename) {
-        if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE,
-                                 base_filename)) {
+        if (qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename)) {
             error_setg(errp, "Backing file not supported for file format '%s'",
                        fmt);
             goto out;
@@ -5568,37 +5605,37 @@ void bdrv_img_create(const char *filename, const char *fmt,
     }
 
     if (base_fmt) {
-        if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) {
+        if (qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt)) {
             error_setg(errp, "Backing file format not supported for file "
                              "format '%s'", fmt);
             goto out;
         }
     }
 
-    backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
-    if (backing_file && backing_file->value.s) {
-        if (!strcmp(filename, backing_file->value.s)) {
+    backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE);
+    if (backing_file) {
+        if (!strcmp(filename, backing_file)) {
             error_setg(errp, "Error: Trying to create an image with the "
                              "same filename as the backing file");
             goto out;
         }
     }
 
-    backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
-    if (backing_fmt && backing_fmt->value.s) {
-        backing_drv = bdrv_find_format(backing_fmt->value.s);
+    backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT);
+    if (backing_fmt) {
+        backing_drv = bdrv_find_format(backing_fmt);
         if (!backing_drv) {
             error_setg(errp, "Unknown backing file format '%s'",
-                       backing_fmt->value.s);
+                       backing_fmt);
             goto out;
         }
     }
 
     // The size for the image must always be specified, with one exception:
     // If we are using a backing file, we can obtain the size from there
-    size = get_option_parameter(param, BLOCK_OPT_SIZE);
-    if (size && size->value.n == -1) {
-        if (backing_file && backing_file->value.s) {
+    size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0);
+    if (size == -1) {
+        if (backing_file) {
             BlockDriverState *bs;
             uint64_t size;
             char buf[32];
@@ -5609,11 +5646,11 @@ void bdrv_img_create(const char *filename, const char *fmt,
                 flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
 
             bs = NULL;
-            ret = bdrv_open(&bs, backing_file->value.s, NULL, NULL, back_flags,
+            ret = bdrv_open(&bs, backing_file, NULL, NULL, back_flags,
                             backing_drv, &local_err);
             if (ret < 0) {
                 error_setg_errno(errp, -ret, "Could not open '%s': %s",
-                                 backing_file->value.s,
+                                 backing_file,
                                  error_get_pretty(local_err));
                 error_free(local_err);
                 local_err = NULL;
@@ -5623,7 +5660,7 @@ void bdrv_img_create(const char *filename, const char *fmt,
             size *= 512;
 
             snprintf(buf, sizeof(buf), "%" PRId64, size);
-            set_option_parameter(param, BLOCK_OPT_SIZE, buf);
+            qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size);
 
             bdrv_unref(bs);
         } else {
@@ -5634,16 +5671,18 @@ void bdrv_img_create(const char *filename, const char *fmt,
 
     if (!quiet) {
         printf("Formatting '%s', fmt=%s ", filename, fmt);
-        print_option_parameters(param);
+        qemu_opts_print(opts);
         puts("");
     }
-    ret = bdrv_create(drv, filename, param, &local_err);
+
+    ret = bdrv_create(drv, filename, NULL, opts, &local_err);
+
     if (ret == -EFBIG) {
         /* This is generally a better message than whatever the driver would
          * deliver (especially because of the cluster_size_hint), since that
          * is most probably not much different from "image too large". */
         const char *cluster_size_hint = "";
-        if (get_option_parameter(create_options, BLOCK_OPT_CLUSTER_SIZE)) {
+        if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) {
             cluster_size_hint = " (try using a larger cluster size)";
         }
         error_setg(errp, "The image size is too large for file format '%s'"
@@ -5653,9 +5692,8 @@ void bdrv_img_create(const char *filename, const char *fmt,
     }
 
 out:
-    free_option_parameters(create_options);
-    free_option_parameters(param);
-
+    qemu_opts_del(opts);
+    qemu_opts_free(create_opts);
     if (local_err) {
         error_propagate(errp, local_err);
     }
@@ -5731,12 +5769,36 @@ void bdrv_add_before_write_notifier(BlockDriverState *bs,
     notifier_with_return_list_add(&bs->before_write_notifiers, notifier);
 }
 
-int bdrv_amend_options(BlockDriverState *bs, QEMUOptionParameter *options)
+int bdrv_amend_options(BlockDriverState *bs, QEMUOptionParameter *options,
+                       QemuOpts *opts)
 {
-    if (bs->drv->bdrv_amend_options == NULL) {
+    int ret;
+    assert(!(options && opts));
+
+    if (!bs->drv->bdrv_amend_options && !bs->drv->bdrv_amend_options2) {
         return -ENOTSUP;
     }
-    return bs->drv->bdrv_amend_options(bs, options);
+    if (bs->drv->bdrv_amend_options2) {
+        QemuOptsList *opts_list = NULL;
+        if (options) {
+            opts_list = params_to_opts(options);
+            opts = qemu_opts_create(opts_list, NULL, 0, &error_abort);
+        }
+        ret = bs->drv->bdrv_amend_options2(bs, opts);
+        if (options) {
+            qemu_opts_del(opts);
+            qemu_opts_free(opts_list);
+        }
+    } else {
+        if (opts) {
+            options = opts_to_params(opts);
+        }
+        ret = bs->drv->bdrv_amend_options(bs, options);
+        if (opts) {
+            free_option_parameters(options);
+        }
+    }
+    return ret;
 }
 
 /* This function will be called by the bdrv_recurse_is_first_non_filter method