diff --git a/qemu-img.c b/qemu-img.c
index b220cf7..22f559a 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1522,7 +1522,7 @@ typedef struct ImgConvertState {
     int min_sparse;
     size_t cluster_sectors;
     size_t buf_sectors;
-    int num_coroutines;
+    long num_coroutines;
     int running_coroutines;
     Coroutine *co[MAX_COROUTINES];
     int64_t wait_sector_num[MAX_COROUTINES];
@@ -1916,39 +1916,29 @@ static int convert_do_copy(ImgConvertState *s)
 
 static int img_convert(int argc, char **argv)
 {
-    int c, bs_n, bs_i, compress, cluster_sectors, skip_create;
-    int64_t ret = 0;
-    int progress = 0, flags, src_flags;
-    bool writethrough, src_writethrough;
-    const char *fmt, *out_fmt, *cache, *src_cache, *out_baseimg, *out_filename;
+    int c, bs_i, flags, src_flags = 0;
+    const char *fmt = NULL, *out_fmt = "raw", *cache = "unsafe",
+               *src_cache = BDRV_DEFAULT_CACHE, *out_baseimg = NULL,
+               *out_filename, *out_baseimg_param, *snapshot_name = NULL;
     BlockDriver *drv, *proto_drv;
-    BlockBackend **blk = NULL, *out_blk = NULL;
-    BlockDriverState **bs = NULL, *out_bs = NULL;
-    int64_t total_sectors;
-    int64_t *bs_sectors = NULL;
-    size_t bufsectors = IO_BUF_SIZE / BDRV_SECTOR_SIZE;
     BlockDriverInfo bdi;
-    QemuOpts *opts = NULL;
+    BlockDriverState *out_bs;
+    QemuOpts *opts = NULL, *sn_opts = NULL;
     QemuOptsList *create_opts = NULL;
-    const char *out_baseimg_param;
     char *options = NULL;
-    const char *snapshot_name = NULL;
-    int min_sparse = 8; /* Need at least 4k of zeros for sparse detection */
-    bool quiet = false;
     Error *local_err = NULL;
-    QemuOpts *sn_opts = NULL;
-    ImgConvertState state;
-    bool image_opts = false;
-    bool wr_in_order = true;
-    long num_coroutines = 8;
+    bool writethrough, src_writethrough, quiet = false, image_opts = false,
+         skip_create = false, progress = false;
+    int64_t ret = -EINVAL;
+
+    ImgConvertState s = (ImgConvertState) {
+        /* Need at least 4k of zeros for sparse detection */
+        .min_sparse         = 8,
+        .buf_sectors        = IO_BUF_SIZE / BDRV_SECTOR_SIZE,
+        .wr_in_order        = true,
+        .num_coroutines     = 8,
+    };
 
-    fmt = NULL;
-    out_fmt = "raw";
-    cache = "unsafe";
-    src_cache = BDRV_DEFAULT_CACHE;
-    out_baseimg = NULL;
-    compress = 0;
-    skip_create = 0;
     for(;;) {
         static const struct option long_options[] = {
             {"help", no_argument, 0, 'h'},
@@ -1981,22 +1971,19 @@ static int img_convert(int argc, char **argv)
             out_baseimg = optarg;
             break;
         case 'c':
-            compress = 1;
+            s.compressed = true;
             break;
         case 'e':
             error_report("option -e is deprecated, please use \'-o "
                   "encryption\' instead!");
-            ret = -1;
             goto fail_getopt;
         case '6':
             error_report("option -6 is deprecated, please use \'-o "
                   "compat6\' instead!");
-            ret = -1;
             goto fail_getopt;
         case 'o':
             if (!is_valid_option_list(optarg)) {
                 error_report("Invalid option list: %s", optarg);
-                ret = -1;
                 goto fail_getopt;
             }
             if (!options) {
@@ -2017,7 +2004,6 @@ static int img_convert(int argc, char **argv)
                 if (!sn_opts) {
                     error_report("Failed in parsing snapshot param '%s'",
                                  optarg);
-                    ret = -1;
                     goto fail_getopt;
                 }
             } else {
@@ -2031,15 +2017,14 @@ static int img_convert(int argc, char **argv)
             sval = cvtnum(optarg);
             if (sval < 0) {
                 error_report("Invalid minimum zero buffer size for sparse output specified");
-                ret = -1;
                 goto fail_getopt;
             }
 
-            min_sparse = sval / BDRV_SECTOR_SIZE;
+            s.min_sparse = sval / BDRV_SECTOR_SIZE;
             break;
         }
         case 'p':
-            progress = 1;
+            progress = true;
             break;
         case 't':
             cache = optarg;
@@ -2051,19 +2036,18 @@ static int img_convert(int argc, char **argv)
             quiet = true;
             break;
         case 'n':
-            skip_create = 1;
+            skip_create = true;
             break;
         case 'm':
-            if (qemu_strtol(optarg, NULL, 0, &num_coroutines) ||
-                num_coroutines < 1 || num_coroutines > MAX_COROUTINES) {
+            if (qemu_strtol(optarg, NULL, 0, &s.num_coroutines) ||
+                s.num_coroutines < 1 || s.num_coroutines > MAX_COROUTINES) {
                 error_report("Invalid number of coroutines. Allowed number of"
                              " coroutines is between 1 and %d", MAX_COROUTINES);
-                ret = -1;
                 goto fail_getopt;
             }
             break;
         case 'W':
-            wr_in_order = false;
+            s.wr_in_order = false;
             break;
         case OPTION_OBJECT:
             opts = qemu_opts_parse_noisily(&qemu_object_opts,
@@ -2084,83 +2068,79 @@ static int img_convert(int argc, char **argv)
         goto fail_getopt;
     }
 
-    if (!wr_in_order && compress) {
+    if (!s.wr_in_order && s.compressed) {
         error_report("Out of order write and compress are mutually exclusive");
-        ret = -1;
         goto fail_getopt;
     }
 
-    /* Initialize before goto out */
-    if (quiet) {
-        progress = 0;
-    }
-    qemu_progress_init(progress, 1.0);
-
-    bs_n = argc - optind - 1;
-    out_filename = bs_n >= 1 ? argv[argc - 1] : NULL;
+    s.src_num = argc - optind - 1;
+    out_filename = s.src_num >= 1 ? argv[argc - 1] : NULL;
 
     if (options && has_help_option(options)) {
         ret = print_block_option_help(out_filename, out_fmt);
-        goto out;
+        goto fail_getopt;
     }
 
-    if (bs_n < 1) {
-        error_exit("Must specify image file name");
+    if (s.src_num < 1) {
+        error_report("Must specify image file name");
+        goto fail_getopt;
     }
 
 
-    if (bs_n > 1 && out_baseimg) {
+    if (s.src_num > 1 && out_baseimg) {
         error_report("-B makes no sense when concatenating multiple input "
                      "images");
-        ret = -1;
-        goto out;
+        goto fail_getopt;
     }
 
-    src_flags = 0;
+    /* ret is still -EINVAL until here */
     ret = bdrv_parse_cache_mode(src_cache, &src_flags, &src_writethrough);
     if (ret < 0) {
         error_report("Invalid source cache option: %s", src_cache);
-        goto out;
+        goto fail_getopt;
     }
 
+    /* Initialize before goto out */
+    if (quiet) {
+        progress = false;
+    }
+    qemu_progress_init(progress, 1.0);
     qemu_progress_print(0, 100);
 
-    blk = g_new0(BlockBackend *, bs_n);
-    bs = g_new0(BlockDriverState *, bs_n);
-    bs_sectors = g_new(int64_t, bs_n);
+    s.src = g_new0(BlockBackend *, s.src_num);
+    s.src_sectors = g_new(int64_t, s.src_num);
 
-    total_sectors = 0;
-    for (bs_i = 0; bs_i < bs_n; bs_i++) {
-        blk[bs_i] = img_open(image_opts, argv[optind + bs_i],
-                             fmt, src_flags, src_writethrough, quiet);
-        if (!blk[bs_i]) {
+    for (bs_i = 0; bs_i < s.src_num; bs_i++) {
+        s.src[bs_i] = img_open(image_opts, argv[optind + bs_i],
+                               fmt, src_flags, src_writethrough, quiet);
+        if (!s.src[bs_i]) {
             ret = -1;
             goto out;
         }
-        bs[bs_i] = blk_bs(blk[bs_i]);
-        bs_sectors[bs_i] = blk_nb_sectors(blk[bs_i]);
-        if (bs_sectors[bs_i] < 0) {
+        s.src_sectors[bs_i] = blk_nb_sectors(s.src[bs_i]);
+        if (s.src_sectors[bs_i] < 0) {
             error_report("Could not get size of %s: %s",
-                         argv[optind + bs_i], strerror(-bs_sectors[bs_i]));
+                         argv[optind + bs_i], strerror(-s.src_sectors[bs_i]));
             ret = -1;
             goto out;
         }
-        total_sectors += bs_sectors[bs_i];
+        s.total_sectors += s.src_sectors[bs_i];
     }
 
     if (sn_opts) {
-        bdrv_snapshot_load_tmp(bs[0],
+        bdrv_snapshot_load_tmp(blk_bs(s.src[0]),
                                qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
                                qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
                                &local_err);
     } else if (snapshot_name != NULL) {
-        if (bs_n > 1) {
+        if (s.src_num > 1) {
             error_report("No support for concatenating multiple snapshot");
             ret = -1;
             goto out;
         }
 
-        bdrv_snapshot_load_tmp_by_id_or_name(bs[0], snapshot_name, &local_err);
+        bdrv_snapshot_load_tmp_by_id_or_name(blk_bs(s.src[0]), snapshot_name,
+                                             &local_err);
     }
     if (local_err) {
         error_reportf_err(local_err, "Failed to load snapshot: ");
@@ -2211,7 +2191,7 @@ static int img_convert(int argc, char **argv)
             }
         }
 
-        qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_sectors * 512,
+        qemu_opt_set_number(opts, BLOCK_OPT_SIZE, s.total_sectors * 512,
                             &error_abort);
         ret = add_old_style_options(out_fmt, opts, out_baseimg, NULL);
         if (ret < 0) {
@@ -2224,9 +2204,10 @@ static int img_convert(int argc, char **argv)
     if (out_baseimg_param) {
         out_baseimg = out_baseimg_param;
     }
+    s.target_has_backing = (bool) out_baseimg;
 
     /* Check if compression is supported */
-    if (compress) {
+    if (s.compressed) {
         bool encryption =
             qemu_opt_get_bool(opts, BLOCK_OPT_ENCRYPT, false);
         const char *preallocation =
@@ -2265,7 +2246,7 @@ static int img_convert(int argc, char **argv)
         }
     }
 
-    flags = min_sparse ? (BDRV_O_RDWR | BDRV_O_UNMAP) : BDRV_O_RDWR;
+    flags = s.min_sparse ? (BDRV_O_RDWR | BDRV_O_UNMAP) : BDRV_O_RDWR;
     ret = bdrv_parse_cache_mode(cache, &flags, &writethrough);
     if (ret < 0) {
         error_report("Invalid cache option: %s", cache);
@@ -2277,64 +2258,48 @@ static int img_convert(int argc, char **argv)
      * the bdrv_create() call which takes different params.
      * Not critical right now, so fix can wait...
      */
-    out_blk = img_open_file(out_filename, out_fmt, flags, writethrough, quiet);
-    if (!out_blk) {
+    s.target = img_open_file(out_filename, out_fmt, flags, writethrough, quiet);
+    if (!s.target) {
         ret = -1;
         goto out;
     }
-    out_bs = blk_bs(out_blk);
+    out_bs = blk_bs(s.target);
 
     /* increase bufsectors from the default 4096 (2M) if opt_transfer
      * or discard_alignment of the out_bs is greater. Limit to 32768 (16MB)
      * as maximum. */
-    bufsectors = MIN(32768,
-                     MAX(bufsectors,
-                         MAX(out_bs->bl.opt_transfer >> BDRV_SECTOR_BITS,
-                             out_bs->bl.pdiscard_alignment >>
-                             BDRV_SECTOR_BITS)));
+    s.buf_sectors = MIN(32768,
+                        MAX(s.buf_sectors,
+                            MAX(out_bs->bl.opt_transfer >> BDRV_SECTOR_BITS,
+                                out_bs->bl.pdiscard_alignment >>
+                                BDRV_SECTOR_BITS)));
 
     if (skip_create) {
-        int64_t output_sectors = blk_nb_sectors(out_blk);
+        int64_t output_sectors = blk_nb_sectors(s.target);
         if (output_sectors < 0) {
             error_report("unable to get output image length: %s",
                          strerror(-output_sectors));
             ret = -1;
             goto out;
-        } else if (output_sectors < total_sectors) {
+        } else if (output_sectors < s.total_sectors) {
             error_report("output file is smaller than input file");
             ret = -1;
             goto out;
         }
     }
 
-    cluster_sectors = 0;
     ret = bdrv_get_info(out_bs, &bdi);
     if (ret < 0) {
-        if (compress) {
+        if (s.compressed) {
             error_report("could not get block driver info");
             goto out;
         }
     } else {
-        compress = compress || bdi.needs_compressed_writes;
-        cluster_sectors = bdi.cluster_size / BDRV_SECTOR_SIZE;
-    }
-
-    state = (ImgConvertState) {
-        .src                = blk,
-        .src_sectors        = bs_sectors,
-        .src_num            = bs_n,
-        .total_sectors      = total_sectors,
-        .target             = out_blk,
-        .compressed         = compress,
-        .target_has_backing = (bool) out_baseimg,
-        .min_sparse         = min_sparse,
-        .cluster_sectors    = cluster_sectors,
-        .buf_sectors        = bufsectors,
-        .wr_in_order        = wr_in_order,
-        .num_coroutines     = num_coroutines,
-    };
-    ret = convert_do_copy(&state);
+        s.compressed = s.compressed || bdi.needs_compressed_writes;
+        s.cluster_sectors = bdi.cluster_size / BDRV_SECTOR_SIZE;
+    }
 
+    ret = convert_do_copy(&s);
 out:
     if (!ret) {
         qemu_progress_print(100, 0);
@@ -2343,22 +2308,18 @@ out:
     qemu_opts_del(opts);
     qemu_opts_free(create_opts);
     qemu_opts_del(sn_opts);
-    blk_unref(out_blk);
-    g_free(bs);
-    if (blk) {
-        for (bs_i = 0; bs_i < bs_n; bs_i++) {
-            blk_unref(blk[bs_i]);
+    blk_unref(s.target);
+    if (s.src) {
+        for (bs_i = 0; bs_i < s.src_num; bs_i++) {
+            blk_unref(s.src[bs_i]);
         }
-        g_free(blk);
+        g_free(s.src);
     }
-    g_free(bs_sectors);
+    g_free(s.src_sectors);
 fail_getopt:
     g_free(options);
 
-    if (ret) {
-        return 1;
-    }
-    return 0;
+    return !!ret;
 }
 
 
