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[mirror_qemu.git] / qemu-img.c

diff --git a/qemu-img.c b/qemu-img.c
index 930ae88a0dab002a9ee7b5c3b4db02d320a1aa8f..df984b11b904b63f93e7dc260f2cd15a1fceb4b2 100644 (file)
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -22,6 +22,8 @@
  * THE SOFTWARE.
  */
 #include "qemu/osdep.h"
+#include <getopt.h>
+
 #include "qemu-version.h"
 #include "qapi/error.h"
 #include "qapi-visit.h"
@@ -42,7 +44,6 @@
 #include "block/qapi.h"
 #include "crypto/init.h"
 #include "trace/control.h"
-#include <getopt.h>
 
 #define QEMU_IMG_VERSION "qemu-img version " QEMU_VERSION QEMU_PKGVERSION \
                           "\n" QEMU_COPYRIGHT "\n"
@@ -62,6 +63,7 @@ enum {
     OPTION_NO_DRAIN = 262,
     OPTION_TARGET_IMAGE_OPTS = 263,
     OPTION_SIZE = 264,
+    OPTION_PREALLOCATION = 265,
 };
 
 typedef enum OutputFormat {
@@ -148,9 +150,11 @@ static void QEMU_NORETURN help(void)
            "  'snapshot_id_or_name' is deprecated, use 'snapshot_param'\n"
            "    instead\n"
            "  '-c' indicates that target image must be compressed (qcow format only)\n"
-           "  '-u' enables unsafe rebasing. It is assumed that old and new backing file\n"
-           "       match exactly. The image doesn't need a working backing file before\n"
-           "       rebasing in this case (useful for renaming the backing file)\n"
+           "  '-u' allows unsafe backing chains. For rebasing, it is assumed that old and\n"
+           "       new backing file match exactly. The image doesn't need a working\n"
+           "       backing file before rebasing in this case (useful for renaming the\n"
+           "       backing file). For image creation, allow creating without attempting\n"
+           "       to open the backing file.\n"
            "  '-h' with or without a command shows this help and lists the supported formats\n"
            "  '-p' show progress of command (only certain commands)\n"
            "  '-q' use Quiet mode - do not print any output (except errors)\n"
@@ -196,7 +200,7 @@ static void QEMU_NORETURN help(void)
 
     printf("%s\nSupported formats:", help_msg);
     bdrv_iterate_format(format_print, NULL);
-    printf("\n");
+    printf("\n\n" QEMU_HELP_BOTTOM "\n");
     exit(EXIT_SUCCESS);
 }
 
@@ -325,7 +329,7 @@ static int img_add_key_secrets(void *opaque,
     QDict *options = opaque;
 
     if (g_str_has_suffix(name, "key-secret")) {
-        qdict_put(options, name, qstring_from_str(value));
+        qdict_put_str(options, name, value);
     }
 
     return 0;
@@ -427,6 +431,7 @@ static int img_create(int argc, char **argv)
     char *options = NULL;
     Error *local_err = NULL;
     bool quiet = false;
+    int flags = 0;
 
     for(;;) {
         static const struct option long_options[] = {
@@ -434,7 +439,7 @@ static int img_create(int argc, char **argv)
             {"object", required_argument, 0, OPTION_OBJECT},
             {0, 0, 0, 0}
         };
-        c = getopt_long(argc, argv, ":F:b:f:ho:q",
+        c = getopt_long(argc, argv, ":F:b:f:ho:qu",
                         long_options, NULL);
         if (c == -1) {
             break;
@@ -474,6 +479,9 @@ static int img_create(int argc, char **argv)
         case 'q':
             quiet = true;
             break;
+        case 'u':
+            flags |= BDRV_O_NO_BACKING;
+            break;
         case OPTION_OBJECT: {
             QemuOpts *opts;
             opts = qemu_opts_parse_noisily(&qemu_object_opts,
@@ -526,7 +534,7 @@ static int img_create(int argc, char **argv)
     }
 
     bdrv_img_create(filename, fmt, base_filename, base_fmt,
-                    options, img_size, 0, quiet, &local_err);
+                    options, img_size, flags, quiet, &local_err);
     if (local_err) {
         error_reportf_err(local_err, "%s: ", filename);
         goto fail;
@@ -3408,9 +3416,10 @@ static int img_resize(int argc, char **argv)
     Error *err = NULL;
     int c, ret, relative;
     const char *filename, *fmt, *size;
-    int64_t n, total_size;
+    int64_t n, total_size, current_size;
     bool quiet = false;
     BlockBackend *blk = NULL;
+    PreallocMode prealloc = PREALLOC_MODE_OFF;
     QemuOpts *param;
 
     static QemuOptsList resize_options = {
@@ -3444,6 +3453,7 @@ static int img_resize(int argc, char **argv)
             {"help", no_argument, 0, 'h'},
             {"object", required_argument, 0, OPTION_OBJECT},
             {"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+            {"preallocation", required_argument, 0, OPTION_PREALLOCATION},
             {0, 0, 0, 0}
         };
         c = getopt_long(argc, argv, ":f:hq",
@@ -3478,6 +3488,14 @@ static int img_resize(int argc, char **argv)
         case OPTION_IMAGE_OPTS:
             image_opts = true;
             break;
+        case OPTION_PREALLOCATION:
+            prealloc = qapi_enum_parse(&PreallocMode_lookup, optarg,
+                                       PREALLOC_MODE__MAX, NULL);
+            if (prealloc == PREALLOC_MODE__MAX) {
+                error_report("Invalid preallocation mode '%s'", optarg);
+                return 1;
+            }
+            break;
         }
     }
     if (optind != argc - 1) {
@@ -3526,8 +3544,16 @@ static int img_resize(int argc, char **argv)
         goto out;
     }
 
+    current_size = blk_getlength(blk);
+    if (current_size < 0) {
+        error_report("Failed to inquire current image length: %s",
+                     strerror(-current_size));
+        ret = -1;
+        goto out;
+    }
+
     if (relative) {
-        total_size = blk_getlength(blk) + n * relative;
+        total_size = current_size + n * relative;
     } else {
         total_size = n;
     }
@@ -3537,7 +3563,13 @@ static int img_resize(int argc, char **argv)
         goto out;
     }
 
-    ret = blk_truncate(blk, total_size, &err);
+    if (total_size <= current_size && prealloc != PREALLOC_MODE_OFF) {
+        error_report("Preallocation can only be used for growing images");
+        ret = -1;
+        goto out;
+    }
+
+    ret = blk_truncate(blk, total_size, prealloc, &err);
     if (!ret) {
         qprintf(quiet, "Image resized.\n");
     } else {