1 files changed, 33 insertions, 15 deletions

diff --git a/qemu-img.c b/qemu-img.c
index bdb9f6aa46..53bd32bf8f 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -79,6 +79,7 @@ enum {
     OPTION_DISABLE = 273,
     OPTION_MERGE = 274,
     OPTION_BITMAPS = 275,
+    OPTION_FORCE = 276,
 };
 
 typedef enum OutputFormat {
@@ -1680,7 +1681,6 @@ typedef struct ImgConvertState {
     BlockBackend *target;
     bool has_zero_init;
     bool compressed;
-    bool unallocated_blocks_are_zero;
     bool target_is_new;
     bool target_has_backing;
     int64_t target_backing_sectors; /* negative if unknown */
@@ -1725,7 +1725,7 @@ static int convert_iteration_sectors(ImgConvertState *s, int64_t sector_num)
 
     if (s->target_backing_sectors >= 0) {
         if (sector_num >= s->target_backing_sectors) {
-            post_backing_zero = s->unallocated_blocks_are_zero;
+            post_backing_zero = true;
         } else if (sector_num + n > s->target_backing_sectors) {
             /* Split requests around target_backing_sectors (because
              * starting from there, zeros are handled differently) */
@@ -2677,7 +2677,6 @@ static int img_convert(int argc, char **argv)
     } else {
         s.compressed = s.compressed || bdi.needs_compressed_writes;
         s.cluster_sectors = bdi.cluster_size / BDRV_SECTOR_SIZE;
-        s.unallocated_blocks_are_zero = bdi.unallocated_blocks_are_zero;
     }
 
     ret = convert_do_copy(&s);
@@ -4067,12 +4066,11 @@ static int print_amend_option_help(const char *format)
         return 1;
     }
 
-    /* Every driver supporting amendment must have create_opts */
-    assert(drv->create_opts);
+    /* Every driver supporting amendment must have amend_opts */
+    assert(drv->amend_opts);
 
-    printf("Creation options for '%s':\n", format);
-    qemu_opts_print_help(drv->create_opts, false);
-    printf("\nNote that not all of these options may be amendable.\n");
+    printf("Amend options for '%s':\n", format);
+    qemu_opts_print_help(drv->amend_opts, false);
     return 0;
 }
 
@@ -4081,7 +4079,7 @@ static int img_amend(int argc, char **argv)
     Error *err = NULL;
     int c, ret = 0;
     char *options = NULL;
-    QemuOptsList *create_opts = NULL;
+    QemuOptsList *amend_opts = NULL;
     QemuOpts *opts = NULL;
     const char *fmt = NULL, *filename, *cache;
     int flags;
@@ -4090,6 +4088,7 @@ static int img_amend(int argc, char **argv)
     BlockBackend *blk = NULL;
     BlockDriverState *bs = NULL;
     bool image_opts = false;
+    bool force = false;
 
     cache = BDRV_DEFAULT_CACHE;
     for (;;) {
@@ -4097,6 +4096,7 @@ static int img_amend(int argc, char **argv)
             {"help", no_argument, 0, 'h'},
             {"object", required_argument, 0, OPTION_OBJECT},
             {"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+            {"force", no_argument, 0, OPTION_FORCE},
             {0, 0, 0, 0}
         };
         c = getopt_long(argc, argv, ":ho:f:t:pq",
@@ -4144,6 +4144,9 @@ static int img_amend(int argc, char **argv)
         case OPTION_IMAGE_OPTS:
             image_opts = true;
             break;
+        case OPTION_FORCE:
+            force = true;
+            break;
         }
     }
 
@@ -4207,13 +4210,28 @@ static int img_amend(int argc, char **argv)
         goto out;
     }
 
-    /* Every driver supporting amendment must have create_opts */
-    assert(bs->drv->create_opts);
+    /* Every driver supporting amendment must have amend_opts */
+    assert(bs->drv->amend_opts);
 
-    create_opts = qemu_opts_append(create_opts, bs->drv->create_opts);
-    opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
+    amend_opts = qemu_opts_append(amend_opts, bs->drv->amend_opts);
+    opts = qemu_opts_create(amend_opts, NULL, 0, &error_abort);
     qemu_opts_do_parse(opts, options, NULL, &err);
+
     if (err) {
+        /* Try to parse options using the create options */
+        Error *err1 = NULL;
+        amend_opts = qemu_opts_append(amend_opts, bs->drv->create_opts);
+        qemu_opts_del(opts);
+        opts = qemu_opts_create(amend_opts, NULL, 0, &error_abort);
+        qemu_opts_do_parse(opts, options, NULL, &err1);
+
+        if (!err1) {
+            error_append_hint(&err,
+                              "This option is only supported for image creation\n");
+        } else {
+            error_free(err1);
+        }
+
         error_report_err(err);
         ret = -1;
         goto out;
@@ -4221,7 +4239,7 @@ static int img_amend(int argc, char **argv)
 
     /* In case the driver does not call amend_status_cb() */
     qemu_progress_print(0.f, 0);
-    ret = bdrv_amend_options(bs, opts, &amend_status_cb, NULL, &err);
+    ret = bdrv_amend_options(bs, opts, &amend_status_cb, NULL, force, &err);
     qemu_progress_print(100.f, 0);
     if (ret < 0) {
         error_report_err(err);
@@ -4234,7 +4252,7 @@ out:
 out_no_progress:
     blk_unref(blk);
     qemu_opts_del(opts);
-    qemu_opts_free(create_opts);
+    qemu_opts_free(amend_opts);
     g_free(options);
 
     if (ret) {