diff --git a/block.c b/block.c
index 4ad663d..819eb4e 100644
--- a/block.c
+++ b/block.c
@@ -667,10 +667,10 @@
  * Removes all processed options from *options.
  */
 static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
-    const char *filename, QDict *options,
-    int flags, BlockDriver *drv)
+    QDict *options, int flags, BlockDriver *drv)
 {
     int ret, open_flags;
+    const char *filename;
 
     assert(drv != NULL);
     assert(bs->file == NULL);
@@ -698,6 +698,12 @@
         bdrv_enable_copy_on_read(bs);
     }
 
+    if (file != NULL) {
+        filename = file->filename;
+    } else {
+        filename = qdict_get_try_str(options, "filename");
+    }
+
     if (filename != NULL) {
         pstrcpy(bs->filename, sizeof(bs->filename), filename);
     } else {
@@ -716,8 +722,15 @@
     if (drv->bdrv_file_open) {
         assert(file == NULL);
         assert(drv->bdrv_parse_filename || filename != NULL);
-        ret = drv->bdrv_file_open(bs, filename, options, open_flags);
+        ret = drv->bdrv_file_open(bs, options, open_flags);
     } else {
+        if (file == NULL) {
+            qerror_report(ERROR_CLASS_GENERIC_ERROR, "Can't use '%s' as a "
+                          "block driver for the protocol level",
+                          drv->format_name);
+            ret = -EINVAL;
+            goto free_and_fail;
+        }
         assert(file != NULL);
         bs->file = file;
         ret = drv->bdrv_open(bs, options, open_flags);
@@ -773,6 +786,18 @@
     bs->options = options;
     options = qdict_clone_shallow(options);
 
+    /* Fetch the file name from the options QDict if necessary */
+    if (!filename) {
+        filename = qdict_get_try_str(options, "filename");
+    } else if (filename && !qdict_haskey(options, "filename")) {
+        qdict_put(options, "filename", qstring_from_str(filename));
+    } else {
+        qerror_report(ERROR_CLASS_GENERIC_ERROR, "Can't specify 'file' and "
+                      "'filename' options at the same time");
+        ret = -EINVAL;
+        goto fail;
+    }
+
     /* Find the right block driver */
     drvname = qdict_get_try_str(options, "driver");
     if (drvname) {
@@ -801,6 +826,7 @@
             ret = -EINVAL;
             goto fail;
         }
+        qdict_del(options, "filename");
     } else if (!drv->bdrv_parse_filename && !filename) {
         qerror_report(ERROR_CLASS_GENERIC_ERROR,
                       "The '%s' block driver requires a file name",
@@ -809,7 +835,7 @@
         goto fail;
     }
 
-    ret = bdrv_open_common(bs, NULL, filename, options, flags, drv);
+    ret = bdrv_open_common(bs, NULL, options, flags, drv);
     if (ret < 0) {
         goto fail;
     }
@@ -838,18 +864,35 @@
     return ret;
 }
 
-int bdrv_open_backing_file(BlockDriverState *bs)
+/*
+ * Opens the backing file for a BlockDriverState if not yet open
+ *
+ * options is a QDict of options to pass to the block drivers, or NULL for an
+ * empty set of options. The reference to the QDict is transferred to this
+ * function (even on failure), so if the caller intends to reuse the dictionary,
+ * it needs to use QINCREF() before calling bdrv_file_open.
+ */
+int bdrv_open_backing_file(BlockDriverState *bs, QDict *options)
 {
     char backing_filename[PATH_MAX];
     int back_flags, ret;
     BlockDriver *back_drv = NULL;
 
     if (bs->backing_hd != NULL) {
+        QDECREF(options);
         return 0;
     }
 
+    /* NULL means an empty set of options */
+    if (options == NULL) {
+        options = qdict_new();
+    }
+
     bs->open_flags &= ~BDRV_O_NO_BACKING;
-    if (bs->backing_file[0] == '\0') {
+    if (qdict_haskey(options, "file.filename")) {
+        backing_filename[0] = '\0';
+    } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) {
+        QDECREF(options);
         return 0;
     }
 
@@ -864,7 +907,8 @@
     /* backing files always opened read-only */
     back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT);
 
-    ret = bdrv_open(bs->backing_hd, backing_filename, NULL,
+    ret = bdrv_open(bs->backing_hd,
+                    *backing_filename ? backing_filename : NULL, options,
                     back_flags, back_drv);
     if (ret < 0) {
         bdrv_delete(bs->backing_hd);
@@ -1008,7 +1052,7 @@
     }
 
     /* Open the image */
-    ret = bdrv_open_common(bs, file, filename, options, flags, drv);
+    ret = bdrv_open_common(bs, file, options, flags, drv);
     if (ret < 0) {
         goto unlink_and_fail;
     }
@@ -1020,7 +1064,10 @@
 
     /* If there is a backing file, use it */
     if ((flags & BDRV_O_NO_BACKING) == 0) {
-        ret = bdrv_open_backing_file(bs);
+        QDict *backing_options;
+
+        extract_subqdict(options, &backing_options, "backing.");
+        ret = bdrv_open_backing_file(bs, backing_options);
         if (ret < 0) {
             goto close_and_fail;
         }
diff --git a/block/blkdebug.c b/block/blkdebug.c
index 37cfbc7..71f99e4 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -273,11 +273,6 @@
     int ret;
     struct add_rule_data d;
 
-    /* Allow usage without config file */
-    if (!*filename) {
-        return 0;
-    }
-
     f = fopen(filename, "r");
     if (f == NULL) {
         return -errno;
@@ -304,44 +299,98 @@
 }
 
 /* Valid blkdebug filenames look like blkdebug:path/to/config:path/to/image */
-static int blkdebug_open(BlockDriverState *bs, const char *filename,
-                         QDict *options, int flags)
+static void blkdebug_parse_filename(const char *filename, QDict *options,
+                                    Error **errp)
 {
-    BDRVBlkdebugState *s = bs->opaque;
-    int ret;
-    char *config, *c;
+    const char *c;
 
     /* Parse the blkdebug: prefix */
-    if (strncmp(filename, "blkdebug:", strlen("blkdebug:"))) {
-        return -EINVAL;
+    if (!strstart(filename, "blkdebug:", &filename)) {
+        error_setg(errp, "File name string must start with 'blkdebug:'");
+        return;
     }
-    filename += strlen("blkdebug:");
 
-    /* Read rules from config file */
+    /* Parse config file path */
     c = strchr(filename, ':');
     if (c == NULL) {
-        return -EINVAL;
+        error_setg(errp, "blkdebug requires both config file and image path");
+        return;
     }
 
-    config = g_strdup(filename);
-    config[c - filename] = '\0';
-    ret = read_config(s, config);
-    g_free(config);
-    if (ret < 0) {
-        return ret;
+    if (c != filename) {
+        QString *config_path;
+        config_path = qstring_from_substr(filename, 0, c - filename - 1);
+        qdict_put(options, "config", config_path);
     }
+
+    /* TODO Allow multi-level nesting and set file.filename here */
     filename = c + 1;
+    qdict_put(options, "x-image", qstring_from_str(filename));
+}
+
+static QemuOptsList runtime_opts = {
+    .name = "blkdebug",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+    .desc = {
+        {
+            .name = "config",
+            .type = QEMU_OPT_STRING,
+            .help = "Path to the configuration file",
+        },
+        {
+            .name = "x-image",
+            .type = QEMU_OPT_STRING,
+            .help = "[internal use only, will be removed]",
+        },
+        { /* end of list */ }
+    },
+};
+
+static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    const char *filename, *config;
+    int ret;
+
+    opts = qemu_opts_create_nofail(&runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        ret = -EINVAL;
+        goto fail;
+    }
+
+    /* Read rules from config file */
+    config = qemu_opt_get(opts, "config");
+    if (config) {
+        ret = read_config(s, config);
+        if (ret < 0) {
+            goto fail;
+        }
+    }
 
     /* Set initial state */
     s->state = 1;
 
     /* Open the backing file */
-    ret = bdrv_file_open(&bs->file, filename, NULL, flags);
-    if (ret < 0) {
-        return ret;
+    filename = qemu_opt_get(opts, "x-image");
+    if (filename == NULL) {
+        ret = -EINVAL;
+        goto fail;
     }
 
-    return 0;
+    ret = bdrv_file_open(&bs->file, filename, NULL, flags);
+    if (ret < 0) {
+        goto fail;
+    }
+
+    ret = 0;
+fail:
+    qemu_opts_del(opts);
+    return ret;
 }
 
 static void error_callback_bh(void *opaque)
@@ -569,17 +618,17 @@
 }
 
 static BlockDriver bdrv_blkdebug = {
-    .format_name        = "blkdebug",
-    .protocol_name      = "blkdebug",
+    .format_name            = "blkdebug",
+    .protocol_name          = "blkdebug",
+    .instance_size          = sizeof(BDRVBlkdebugState),
 
-    .instance_size      = sizeof(BDRVBlkdebugState),
+    .bdrv_parse_filename    = blkdebug_parse_filename,
+    .bdrv_file_open         = blkdebug_open,
+    .bdrv_close             = blkdebug_close,
+    .bdrv_getlength         = blkdebug_getlength,
 
-    .bdrv_file_open     = blkdebug_open,
-    .bdrv_close         = blkdebug_close,
-    .bdrv_getlength     = blkdebug_getlength,
-
-    .bdrv_aio_readv     = blkdebug_aio_readv,
-    .bdrv_aio_writev    = blkdebug_aio_writev,
+    .bdrv_aio_readv         = blkdebug_aio_readv,
+    .bdrv_aio_writev        = blkdebug_aio_writev,
 
     .bdrv_debug_event           = blkdebug_debug_event,
     .bdrv_debug_breakpoint      = blkdebug_debug_breakpoint,
diff --git a/block/blkverify.c b/block/blkverify.c
index 59e3b05..1d58cc3 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -69,44 +69,100 @@
 }
 
 /* Valid blkverify filenames look like blkverify:path/to/raw_image:path/to/image */
-static int blkverify_open(BlockDriverState *bs, const char *filename,
-                          QDict *options, int flags)
+static void blkverify_parse_filename(const char *filename, QDict *options,
+                                     Error **errp)
 {
-    BDRVBlkverifyState *s = bs->opaque;
-    int ret;
-    char *raw, *c;
+    const char *c;
+    QString *raw_path;
+
 
     /* Parse the blkverify: prefix */
-    if (strncmp(filename, "blkverify:", strlen("blkverify:"))) {
-        return -EINVAL;
+    if (!strstart(filename, "blkverify:", &filename)) {
+        error_setg(errp, "File name string must start with 'blkverify:'");
+        return;
     }
-    filename += strlen("blkverify:");
 
     /* Parse the raw image filename */
     c = strchr(filename, ':');
     if (c == NULL) {
-        return -EINVAL;
+        error_setg(errp, "blkverify requires raw copy and original image path");
+        return;
     }
 
-    raw = g_strdup(filename);
-    raw[c - filename] = '\0';
-    ret = bdrv_file_open(&bs->file, raw, NULL, flags);
-    g_free(raw);
-    if (ret < 0) {
-        return ret;
-    }
+    /* TODO Implement option pass-through and set raw.filename here */
+    raw_path = qstring_from_substr(filename, 0, c - filename - 1);
+    qdict_put(options, "x-raw", raw_path);
+
+    /* TODO Allow multi-level nesting and set file.filename here */
     filename = c + 1;
+    qdict_put(options, "x-image", qstring_from_str(filename));
+}
+
+static QemuOptsList runtime_opts = {
+    .name = "blkverify",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+    .desc = {
+        {
+            .name = "x-raw",
+            .type = QEMU_OPT_STRING,
+            .help = "[internal use only, will be removed]",
+        },
+        {
+            .name = "x-image",
+            .type = QEMU_OPT_STRING,
+            .help = "[internal use only, will be removed]",
+        },
+        { /* end of list */ }
+    },
+};
+
+static int blkverify_open(BlockDriverState *bs, QDict *options, int flags)
+{
+    BDRVBlkverifyState *s = bs->opaque;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    const char *filename, *raw;
+    int ret;
+
+    opts = qemu_opts_create_nofail(&runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        ret = -EINVAL;
+        goto fail;
+    }
+
+    /* Parse the raw image filename */
+    raw = qemu_opt_get(opts, "x-raw");
+    if (raw == NULL) {
+        ret = -EINVAL;
+        goto fail;
+    }
+
+    ret = bdrv_file_open(&bs->file, raw, NULL, flags);
+    if (ret < 0) {
+        goto fail;
+    }
 
     /* Open the test file */
+    filename = qemu_opt_get(opts, "x-image");
+    if (filename == NULL) {
+        ret = -EINVAL;
+        goto fail;
+    }
+
     s->test_file = bdrv_new("");
     ret = bdrv_open(s->test_file, filename, NULL, flags, NULL);
     if (ret < 0) {
         bdrv_delete(s->test_file);
         s->test_file = NULL;
-        return ret;
+        goto fail;
     }
 
-    return 0;
+    ret = 0;
+fail:
+    return ret;
 }
 
 static void blkverify_close(BlockDriverState *bs)
@@ -344,19 +400,18 @@
 }
 
 static BlockDriver bdrv_blkverify = {
-    .format_name        = "blkverify",
-    .protocol_name      = "blkverify",
+    .format_name            = "blkverify",
+    .protocol_name          = "blkverify",
+    .instance_size          = sizeof(BDRVBlkverifyState),
 
-    .instance_size      = sizeof(BDRVBlkverifyState),
+    .bdrv_parse_filename    = blkverify_parse_filename,
+    .bdrv_file_open         = blkverify_open,
+    .bdrv_close             = blkverify_close,
+    .bdrv_getlength         = blkverify_getlength,
 
-    .bdrv_getlength     = blkverify_getlength,
-
-    .bdrv_file_open     = blkverify_open,
-    .bdrv_close         = blkverify_close,
-
-    .bdrv_aio_readv     = blkverify_aio_readv,
-    .bdrv_aio_writev    = blkverify_aio_writev,
-    .bdrv_aio_flush     = blkverify_aio_flush,
+    .bdrv_aio_readv         = blkverify_aio_readv,
+    .bdrv_aio_writev        = blkverify_aio_writev,
+    .bdrv_aio_flush         = blkverify_aio_flush,
 };
 
 static void bdrv_blkverify_init(void)
diff --git a/block/curl.c b/block/curl.c
index 186e3b0..b8935fd 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -335,12 +335,9 @@
     s->in_use = 0;
 }
 
-static int curl_open(BlockDriverState *bs, const char *filename,
-                     QDict *options, int flags)
+static void curl_parse_filename(const char *filename, QDict *options,
+                                Error **errp)
 {
-    BDRVCURLState *s = bs->opaque;
-    CURLState *state = NULL;
-    double d;
 
     #define RA_OPTSTR ":readahead="
     char *file;
@@ -348,19 +345,17 @@
     const char *ra_val;
     int parse_state = 0;
 
-    static int inited = 0;
-
     file = g_strdup(filename);
-    s->readahead_size = READ_AHEAD_SIZE;
 
     /* Parse a trailing ":readahead=#:" param, if present. */
     ra = file + strlen(file) - 1;
     while (ra >= file) {
         if (parse_state == 0) {
-            if (*ra == ':')
+            if (*ra == ':') {
                 parse_state++;
-            else
+            } else {
                 break;
+            }
         } else if (parse_state == 1) {
             if (*ra > '9' || *ra < '0') {
                 char *opt_start = ra - strlen(RA_OPTSTR) + 1;
@@ -369,29 +364,77 @@
                     ra_val = ra + 1;
                     ra -= strlen(RA_OPTSTR) - 1;
                     *ra = '\0';
-                    s->readahead_size = atoi(ra_val);
-                    break;
-                } else {
-                    break;
+                    qdict_put(options, "readahead", qstring_from_str(ra_val));
                 }
+                break;
             }
         }
         ra--;
     }
 
+    qdict_put(options, "url", qstring_from_str(file));
+
+    g_free(file);
+}
+
+static QemuOptsList runtime_opts = {
+    .name = "curl",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+    .desc = {
+        {
+            .name = "url",
+            .type = QEMU_OPT_STRING,
+            .help = "URL to open",
+        },
+        {
+            .name = "readahead",
+            .type = QEMU_OPT_SIZE,
+            .help = "Readahead size",
+        },
+        { /* end of list */ }
+    },
+};
+
+static int curl_open(BlockDriverState *bs, QDict *options, int flags)
+{
+    BDRVCURLState *s = bs->opaque;
+    CURLState *state = NULL;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    const char *file;
+    double d;
+
+    static int inited = 0;
+
+    opts = qemu_opts_create_nofail(&runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        goto out_noclean;
+    }
+
+    s->readahead_size = qemu_opt_get_size(opts, "readahead", READ_AHEAD_SIZE);
     if ((s->readahead_size & 0x1ff) != 0) {
         fprintf(stderr, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512\n",
                 s->readahead_size);
         goto out_noclean;
     }
 
+    file = qemu_opt_get(opts, "url");
+    if (file == NULL) {
+        qerror_report(ERROR_CLASS_GENERIC_ERROR, "curl block driver requires "
+                      "an 'url' option");
+        goto out_noclean;
+    }
+
     if (!inited) {
         curl_global_init(CURL_GLOBAL_ALL);
         inited = 1;
     }
 
     DPRINTF("CURL: Opening %s\n", file);
-    s->url = file;
+    s->url = g_strdup(file);
     state = curl_init_state(s);
     if (!state)
         goto out_noclean;
@@ -423,6 +466,7 @@
     curl_multi_setopt( s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb ); 
     curl_multi_do(s);
 
+    qemu_opts_del(opts);
     return 0;
 
 out:
@@ -430,7 +474,8 @@
     curl_easy_cleanup(state->curl);
     state->curl = NULL;
 out_noclean:
-    g_free(file);
+    g_free(s->url);
+    qemu_opts_del(opts);
     return -EINVAL;
 }
 
@@ -568,63 +613,68 @@
 }
 
 static BlockDriver bdrv_http = {
-    .format_name     = "http",
-    .protocol_name   = "http",
+    .format_name            = "http",
+    .protocol_name          = "http",
 
-    .instance_size   = sizeof(BDRVCURLState),
-    .bdrv_file_open  = curl_open,
-    .bdrv_close      = curl_close,
-    .bdrv_getlength  = curl_getlength,
+    .instance_size          = sizeof(BDRVCURLState),
+    .bdrv_parse_filename    = curl_parse_filename,
+    .bdrv_file_open         = curl_open,
+    .bdrv_close             = curl_close,
+    .bdrv_getlength         = curl_getlength,
 
-    .bdrv_aio_readv  = curl_aio_readv,
+    .bdrv_aio_readv         = curl_aio_readv,
 };
 
 static BlockDriver bdrv_https = {
-    .format_name     = "https",
-    .protocol_name   = "https",
+    .format_name            = "https",
+    .protocol_name          = "https",
 
-    .instance_size   = sizeof(BDRVCURLState),
-    .bdrv_file_open  = curl_open,
-    .bdrv_close      = curl_close,
-    .bdrv_getlength  = curl_getlength,
+    .instance_size          = sizeof(BDRVCURLState),
+    .bdrv_parse_filename    = curl_parse_filename,
+    .bdrv_file_open         = curl_open,
+    .bdrv_close             = curl_close,
+    .bdrv_getlength         = curl_getlength,
 
-    .bdrv_aio_readv  = curl_aio_readv,
+    .bdrv_aio_readv         = curl_aio_readv,
 };
 
 static BlockDriver bdrv_ftp = {
-    .format_name     = "ftp",
-    .protocol_name   = "ftp",
+    .format_name            = "ftp",
+    .protocol_name          = "ftp",
 
-    .instance_size   = sizeof(BDRVCURLState),
-    .bdrv_file_open  = curl_open,
-    .bdrv_close      = curl_close,
-    .bdrv_getlength  = curl_getlength,
+    .instance_size          = sizeof(BDRVCURLState),
+    .bdrv_parse_filename    = curl_parse_filename,
+    .bdrv_file_open         = curl_open,
+    .bdrv_close             = curl_close,
+    .bdrv_getlength         = curl_getlength,
 
-    .bdrv_aio_readv  = curl_aio_readv,
+    .bdrv_aio_readv         = curl_aio_readv,
 };
 
 static BlockDriver bdrv_ftps = {
-    .format_name     = "ftps",
-    .protocol_name   = "ftps",
+    .format_name            = "ftps",
+    .protocol_name          = "ftps",
 
-    .instance_size   = sizeof(BDRVCURLState),
-    .bdrv_file_open  = curl_open,
-    .bdrv_close      = curl_close,
-    .bdrv_getlength  = curl_getlength,
+    .instance_size          = sizeof(BDRVCURLState),
+    .bdrv_parse_filename    = curl_parse_filename,
+    .bdrv_file_open         = curl_open,
+    .bdrv_close             = curl_close,
+    .bdrv_getlength         = curl_getlength,
 
-    .bdrv_aio_readv  = curl_aio_readv,
+    .bdrv_aio_readv         = curl_aio_readv,
 };
 
 static BlockDriver bdrv_tftp = {
-    .format_name     = "tftp",
-    .protocol_name   = "tftp",
+    .format_name            = "tftp",
+    .protocol_name          = "tftp",
 
-    .instance_size   = sizeof(BDRVCURLState),
-    .bdrv_file_open  = curl_open,
-    .bdrv_close      = curl_close,
-    .bdrv_getlength  = curl_getlength,
+    .instance_size          = sizeof(BDRVCURLState),
+    .bdrv_parse_filename    = curl_parse_filename,
+    .bdrv_file_open         = curl_open,
+    .bdrv_close             = curl_close,
+    .bdrv_getlength         = curl_getlength,
 
-    .bdrv_aio_readv  = curl_aio_readv,
+    .bdrv_aio_readv         = curl_aio_readv,
 };
 
 static void curl_block_init(void)
diff --git a/block/gluster.c b/block/gluster.c
index 9ccd4d4..91acde2 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -282,13 +282,42 @@
     return (s->qemu_aio_count > 0);
 }
 
-static int qemu_gluster_open(BlockDriverState *bs, const char *filename,
-    QDict *options, int bdrv_flags)
+/* TODO Convert to fine grained options */
+static QemuOptsList runtime_opts = {
+    .name = "gluster",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+    .desc = {
+        {
+            .name = "filename",
+            .type = QEMU_OPT_STRING,
+            .help = "URL to the gluster image",
+        },
+        { /* end of list */ }
+    },
+};
+
+static int qemu_gluster_open(BlockDriverState *bs,  QDict *options,
+                             int bdrv_flags)
 {
     BDRVGlusterState *s = bs->opaque;
     int open_flags = O_BINARY;
     int ret = 0;
     GlusterConf *gconf = g_malloc0(sizeof(GlusterConf));
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    const char *filename;
+
+    opts = qemu_opts_create_nofail(&runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        ret = -EINVAL;
+        goto out;
+    }
+
+    filename = qemu_opt_get(opts, "filename");
+
 
     s->glfs = qemu_gluster_init(gconf, filename);
     if (!s->glfs) {
@@ -322,6 +351,7 @@
         qemu_gluster_aio_event_reader, NULL, qemu_gluster_aio_flush_cb, s);
 
 out:
+    qemu_opts_del(opts);
     qemu_gluster_gconf_free(gconf);
     if (!ret) {
         return ret;
diff --git a/block/iscsi.c b/block/iscsi.c
index 92d6eae..f7199c1 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1003,12 +1003,25 @@
     return ret;
 }
 
+/* TODO Convert to fine grained options */
+static QemuOptsList runtime_opts = {
+    .name = "iscsi",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+    .desc = {
+        {
+            .name = "filename",
+            .type = QEMU_OPT_STRING,
+            .help = "URL to the iscsi image",
+        },
+        { /* end of list */ }
+    },
+};
+
 /*
  * We support iscsi url's on the form
  * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
  */
-static int iscsi_open(BlockDriverState *bs, const char *filename,
-                      QDict *options, int flags)
+static int iscsi_open(BlockDriverState *bs, QDict *options, int flags)
 {
     IscsiLun *iscsilun = bs->opaque;
     struct iscsi_context *iscsi = NULL;
@@ -1016,6 +1029,9 @@
     struct scsi_task *task = NULL;
     struct scsi_inquiry_standard *inq = NULL;
     char *initiator_name = NULL;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    const char *filename;
     int ret;
 
     if ((BDRV_SECTOR_SIZE % 512) != 0) {
@@ -1025,6 +1041,18 @@
         return -EINVAL;
     }
 
+    opts = qemu_opts_create_nofail(&runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        ret = -EINVAL;
+        goto out;
+    }
+
+    filename = qemu_opt_get(opts, "filename");
+
+
     iscsi_url = iscsi_parse_full_url(iscsi, filename);
     if (iscsi_url == NULL) {
         error_report("Failed to parse URL : %s", filename);
@@ -1126,6 +1154,7 @@
 #endif
 
 out:
+    qemu_opts_del(opts);
     if (initiator_name != NULL) {
         g_free(initiator_name);
     }
@@ -1190,6 +1219,7 @@
     int64_t total_size = 0;
     BlockDriverState bs;
     IscsiLun *iscsilun = NULL;
+    QDict *bs_options;
 
     memset(&bs, 0, sizeof(BlockDriverState));
 
@@ -1204,7 +1234,11 @@
     bs.opaque = g_malloc0(sizeof(struct IscsiLun));
     iscsilun = bs.opaque;
 
-    ret = iscsi_open(&bs, filename, NULL, 0);
+    bs_options = qdict_new();
+    qdict_put(bs_options, "filename", qstring_from_str(filename));
+    ret = iscsi_open(&bs, bs_options, 0);
+    QDECREF(bs_options);
+
     if (ret != 0) {
         goto out;
     }
diff --git a/block/mirror.c b/block/mirror.c
index a62ad86..8b07dec 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -507,7 +507,7 @@
     MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
     int ret;
 
-    ret = bdrv_open_backing_file(s->target);
+    ret = bdrv_open_backing_file(s->target, NULL);
     if (ret < 0) {
         char backing_filename[PATH_MAX];
         bdrv_get_full_backing_filename(s->target, backing_filename,
diff --git a/block/nbd.c b/block/nbd.c
index d9dc454..fab114b 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -454,8 +454,7 @@
     closesocket(s->sock);
 }
 
-static int nbd_open(BlockDriverState *bs, const char* filename,
-                    QDict *options, int flags)
+static int nbd_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVNBDState *s = bs->opaque;
     int result;
diff --git a/block/qcow.c b/block/qcow.c
index 3278e55..e2a64c7 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -787,8 +787,21 @@
     uint8_t *out_buf;
     uint64_t cluster_offset;
 
-    if (nb_sectors != s->cluster_sectors)
-        return -EINVAL;
+    if (nb_sectors != s->cluster_sectors) {
+        ret = -EINVAL;
+
+        /* Zero-pad last write if image size is not cluster aligned */
+        if (sector_num + nb_sectors == bs->total_sectors &&
+            nb_sectors < s->cluster_sectors) {
+            uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size);
+            memset(pad_buf, 0, s->cluster_size);
+            memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE);
+            ret = qcow_write_compressed(bs, sector_num,
+                                        pad_buf, s->cluster_sectors);
+            qemu_vfree(pad_buf);
+        }
+        return ret;
+    }
 
     out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128);
 
diff --git a/block/qcow2.c b/block/qcow2.c
index e8934de..2e346d8 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1537,8 +1537,21 @@
         return 0;
     }
 
-    if (nb_sectors != s->cluster_sectors)
-        return -EINVAL;
+    if (nb_sectors != s->cluster_sectors) {
+        ret = -EINVAL;
+
+        /* Zero-pad last write if image size is not cluster aligned */
+        if (sector_num + nb_sectors == bs->total_sectors &&
+            nb_sectors < s->cluster_sectors) {
+            uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size);
+            memset(pad_buf, 0, s->cluster_size);
+            memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE);
+            ret = qcow2_write_compressed(bs, sector_num,
+                                         pad_buf, s->cluster_sectors);
+            qemu_vfree(pad_buf);
+        }
+        return ret;
+    }
 
     out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128);
 
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 99ac869..c0ccf27 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -262,15 +262,42 @@
 }
 #endif
 
-static int raw_open_common(BlockDriverState *bs, const char *filename,
+static QemuOptsList raw_runtime_opts = {
+    .name = "raw",
+    .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
+    .desc = {
+        {
+            .name = "filename",
+            .type = QEMU_OPT_STRING,
+            .help = "File name of the image",
+        },
+        { /* end of list */ }
+    },
+};
+
+static int raw_open_common(BlockDriverState *bs, QDict *options,
                            int bdrv_flags, int open_flags)
 {
     BDRVRawState *s = bs->opaque;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    const char *filename;
     int fd, ret;
 
+    opts = qemu_opts_create_nofail(&raw_runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        ret = -EINVAL;
+        goto fail;
+    }
+
+    filename = qemu_opt_get(opts, "filename");
+
     ret = raw_normalize_devicepath(&filename);
     if (ret != 0) {
-        return ret;
+        goto fail;
     }
 
     s->open_flags = open_flags;
@@ -280,16 +307,18 @@
     fd = qemu_open(filename, s->open_flags, 0644);
     if (fd < 0) {
         ret = -errno;
-        if (ret == -EROFS)
+        if (ret == -EROFS) {
             ret = -EACCES;
-        return ret;
+        }
+        goto fail;
     }
     s->fd = fd;
 
 #ifdef CONFIG_LINUX_AIO
     if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) {
         qemu_close(fd);
-        return -errno;
+        ret = -errno;
+        goto fail;
     }
 #endif
 
@@ -300,16 +329,18 @@
     }
 #endif
 
-    return 0;
+    ret = 0;
+fail:
+    qemu_opts_del(opts);
+    return ret;
 }
 
-static int raw_open(BlockDriverState *bs, const char *filename,
-                    QDict *options, int flags)
+static int raw_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVRawState *s = bs->opaque;
 
     s->type = FTYPE_FILE;
-    return raw_open_common(bs, filename, flags, 0);
+    return raw_open_common(bs, options, flags, 0);
 }
 
 static int raw_reopen_prepare(BDRVReopenState *state,
@@ -1293,11 +1324,11 @@
     return 0;
 }
 
-static int hdev_open(BlockDriverState *bs, const char *filename,
-                     QDict *options, int flags)
+static int hdev_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVRawState *s = bs->opaque;
     int ret;
+    const char *filename = qdict_get_str(options, "filename");
 
 #if defined(__APPLE__) && defined(__MACH__)
     if (strstart(filename, "/dev/cdrom", NULL)) {
@@ -1338,7 +1369,7 @@
     }
 #endif
 
-    ret = raw_open_common(bs, filename, flags, 0);
+    ret = raw_open_common(bs, options, flags, 0);
     if (ret < 0) {
         return ret;
     }
@@ -1532,8 +1563,7 @@
 };
 
 #ifdef __linux__
-static int floppy_open(BlockDriverState *bs, const char *filename,
-                       QDict *options, int flags)
+static int floppy_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVRawState *s = bs->opaque;
     int ret;
@@ -1541,7 +1571,7 @@
     s->type = FTYPE_FD;
 
     /* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
-    ret = raw_open_common(bs, filename, flags, O_NONBLOCK);
+    ret = raw_open_common(bs, options, flags, O_NONBLOCK);
     if (ret)
         return ret;
 
@@ -1655,15 +1685,14 @@
     .bdrv_eject         = floppy_eject,
 };
 
-static int cdrom_open(BlockDriverState *bs, const char *filename,
-                      QDict *options, int flags)
+static int cdrom_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVRawState *s = bs->opaque;
 
     s->type = FTYPE_CD;
 
     /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
-    return raw_open_common(bs, filename, flags, O_NONBLOCK);
+    return raw_open_common(bs, options, flags, O_NONBLOCK);
 }
 
 static int cdrom_probe_device(const char *filename)
@@ -1764,15 +1793,14 @@
 #endif /* __linux__ */
 
 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
-static int cdrom_open(BlockDriverState *bs, const char *filename,
-                      QDict *options, int flags)
+static int cdrom_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVRawState *s = bs->opaque;
     int ret;
 
     s->type = FTYPE_CD;
 
-    ret = raw_open_common(bs, filename, flags, 0);
+    ret = raw_open_common(bs, options, flags, 0);
     if (ret)
         return ret;
 
diff --git a/block/raw-win32.c b/block/raw-win32.c
index ece2f1a..7c03b6d 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -221,21 +221,49 @@
     }
 }
 
-static int raw_open(BlockDriverState *bs, const char *filename,
-                    QDict *options, int flags)
+static QemuOptsList raw_runtime_opts = {
+    .name = "raw",
+    .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
+    .desc = {
+        {
+            .name = "filename",
+            .type = QEMU_OPT_STRING,
+            .help = "File name of the image",
+        },
+        { /* end of list */ }
+    },
+};
+
+static int raw_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVRawState *s = bs->opaque;
     int access_flags;
     DWORD overlapped;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    const char *filename;
+    int ret;
 
     s->type = FTYPE_FILE;
 
+    opts = qemu_opts_create_nofail(&raw_runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        ret = -EINVAL;
+        goto fail;
+    }
+
+    filename = qemu_opt_get(opts, "filename");
+
     raw_parse_flags(flags, &access_flags, &overlapped);
-    
+
     if ((flags & BDRV_O_NATIVE_AIO) && aio == NULL) {
         aio = win32_aio_init();
         if (aio == NULL) {
-            return -EINVAL;
+            ret = -EINVAL;
+            goto fail;
         }
     }
 
@@ -245,20 +273,27 @@
     if (s->hfile == INVALID_HANDLE_VALUE) {
         int err = GetLastError();
 
-        if (err == ERROR_ACCESS_DENIED)
-            return -EACCES;
-        return -EINVAL;
+        if (err == ERROR_ACCESS_DENIED) {
+            ret = -EACCES;
+        } else {
+            ret = -EINVAL;
+        }
+        goto fail;
     }
 
     if (flags & BDRV_O_NATIVE_AIO) {
-        int ret = win32_aio_attach(aio, s->hfile);
+        ret = win32_aio_attach(aio, s->hfile);
         if (ret < 0) {
             CloseHandle(s->hfile);
-            return ret;
+            goto fail;
         }
         s->aio = aio;
     }
-    return 0;
+
+    ret = 0;
+fail:
+    qemu_opts_del(opts);
+    return ret;
 }
 
 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
@@ -495,13 +530,13 @@
     return 0;
 }
 
-static int hdev_open(BlockDriverState *bs, const char *filename,
-                     QDict *options, int flags)
+static int hdev_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVRawState *s = bs->opaque;
     int access_flags, create_flags;
     DWORD overlapped;
     char device_name[64];
+    const char *filename = qdict_get_str(options, "filename");
 
     if (strstart(filename, "/dev/cdrom", NULL)) {
         if (find_cdrom(device_name, sizeof(device_name)) < 0)
diff --git a/block/rbd.c b/block/rbd.c
index 141b488..1826411 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -441,8 +441,21 @@
     return (s->qemu_aio_count > 0);
 }
 
-static int qemu_rbd_open(BlockDriverState *bs, const char *filename,
-                         QDict *options, int flags)
+/* TODO Convert to fine grained options */
+static QemuOptsList runtime_opts = {
+    .name = "rbd",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+    .desc = {
+        {
+            .name = "filename",
+            .type = QEMU_OPT_STRING,
+            .help = "Specification of the rbd image",
+        },
+        { /* end of list */ }
+    },
+};
+
+static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVRBDState *s = bs->opaque;
     char pool[RBD_MAX_POOL_NAME_SIZE];
@@ -450,8 +463,23 @@
     char conf[RBD_MAX_CONF_SIZE];
     char clientname_buf[RBD_MAX_CONF_SIZE];
     char *clientname;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    const char *filename;
     int r;
 
+    opts = qemu_opts_create_nofail(&runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        qemu_opts_del(opts);
+        return -EINVAL;
+    }
+
+    filename = qemu_opt_get(opts, "filename");
+    qemu_opts_del(opts);
+
     if (qemu_rbd_parsename(filename, pool, sizeof(pool),
                            snap_buf, sizeof(snap_buf),
                            s->name, sizeof(s->name),
diff --git a/block/sheepdog.c b/block/sheepdog.c
index 1c5b532..20b5d06 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -1126,8 +1126,21 @@
                              create, cache_flags);
 }
 
-static int sd_open(BlockDriverState *bs, const char *filename,
-                   QDict *options, int flags)
+/* TODO Convert to fine grained options */
+static QemuOptsList runtime_opts = {
+    .name = "sheepdog",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+    .desc = {
+        {
+            .name = "filename",
+            .type = QEMU_OPT_STRING,
+            .help = "URL to the sheepdog image",
+        },
+        { /* end of list */ }
+    },
+};
+
+static int sd_open(BlockDriverState *bs, QDict *options, int flags)
 {
     int ret, fd;
     uint32_t vid = 0;
@@ -1135,6 +1148,20 @@
     char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
     uint32_t snapid;
     char *buf = NULL;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    const char *filename;
+
+    opts = qemu_opts_create_nofail(&runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        ret = -EINVAL;
+        goto out;
+    }
+
+    filename = qemu_opt_get(opts, "filename");
 
     QLIST_INIT(&s->inflight_aio_head);
     QLIST_INIT(&s->pending_aio_head);
@@ -1199,6 +1226,7 @@
     bs->total_sectors = s->inode.vdi_size / SECTOR_SIZE;
     pstrcpy(s->name, sizeof(s->name), vdi);
     qemu_co_mutex_init(&s->lock);
+    qemu_opts_del(opts);
     g_free(buf);
     return 0;
 out:
@@ -1206,6 +1234,7 @@
     if (s->fd >= 0) {
         closesocket(s->fd);
     }
+    qemu_opts_del(opts);
     g_free(buf);
     return ret;
 }
diff --git a/block/ssh.c b/block/ssh.c
index 93a8b53..246a70d 100644
--- a/block/ssh.c
+++ b/block/ssh.c
@@ -608,8 +608,7 @@
     return ret;
 }
 
-static int ssh_file_open(BlockDriverState *bs, const char *filename,
-                         QDict *options, int bdrv_flags)
+static int ssh_file_open(BlockDriverState *bs, QDict *options, int bdrv_flags)
 {
     BDRVSSHState *s = bs->opaque;
     int ret;
diff --git a/block/vvfat.c b/block/vvfat.c
index ef74c30..87b0279 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1,4 +1,4 @@
-/* vim:set shiftwidth=4 ts=8: */
+/* vim:set shiftwidth=4 ts=4: */
 /*
  * QEMU Block driver for virtual VFAT (shadows a local directory)
  *
@@ -28,6 +28,8 @@
 #include "block/block_int.h"
 #include "qemu/module.h"
 #include "migration/migration.h"
+#include "qapi/qmp/qint.h"
+#include "qapi/qmp/qbool.h"
 
 #ifndef S_IWGRP
 #define S_IWGRP 0
@@ -988,11 +990,90 @@
     s->bs = bs;
 }
 
-static int vvfat_open(BlockDriverState *bs, const char* dirname,
-                      QDict *options, int flags)
+static QemuOptsList runtime_opts = {
+    .name = "vvfat",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+    .desc = {
+        {
+            .name = "dir",
+            .type = QEMU_OPT_STRING,
+            .help = "Host directory to map to the vvfat device",
+        },
+        {
+            .name = "fat-type",
+            .type = QEMU_OPT_NUMBER,
+            .help = "FAT type (12, 16 or 32)",
+        },
+        {
+            .name = "floppy",
+            .type = QEMU_OPT_BOOL,
+            .help = "Create a floppy rather than a hard disk image",
+        },
+        {
+            .name = "rw",
+            .type = QEMU_OPT_BOOL,
+            .help = "Make the image writable",
+        },
+        { /* end of list */ }
+    },
+};
+
+static void vvfat_parse_filename(const char *filename, QDict *options,
+                                 Error **errp)
+{
+    int fat_type = 0;
+    bool floppy = false;
+    bool rw = false;
+    int i;
+
+    if (!strstart(filename, "fat:", NULL)) {
+        error_setg(errp, "File name string must start with 'fat:'");
+        return;
+    }
+
+    /* Parse options */
+    if (strstr(filename, ":32:")) {
+        fat_type = 32;
+    } else if (strstr(filename, ":16:")) {
+        fat_type = 16;
+    } else if (strstr(filename, ":12:")) {
+        fat_type = 12;
+    }
+
+    if (strstr(filename, ":floppy:")) {
+        floppy = true;
+    }
+
+    if (strstr(filename, ":rw:")) {
+        rw = true;
+    }
+
+    /* Get the directory name without options */
+    i = strrchr(filename, ':') - filename;
+    assert(i >= 3);
+    if (filename[i - 2] == ':' && qemu_isalpha(filename[i - 1])) {
+        /* workaround for DOS drive names */
+        filename += i - 1;
+    } else {
+        filename += i + 1;
+    }
+
+    /* Fill in the options QDict */
+    qdict_put(options, "dir", qstring_from_str(filename));
+    qdict_put(options, "fat-type", qint_from_int(fat_type));
+    qdict_put(options, "floppy", qbool_from_int(floppy));
+    qdict_put(options, "rw", qbool_from_int(rw));
+}
+
+static int vvfat_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVVVFATState *s = bs->opaque;
-    int i, cyls, heads, secs;
+    int cyls, heads, secs;
+    bool floppy;
+    const char *dirname;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    int ret;
 
 #ifdef DEBUG
     vvv = s;
@@ -1003,6 +1084,65 @@
     setbuf(stderr, NULL);
 })
 
+    opts = qemu_opts_create_nofail(&runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        ret = -EINVAL;
+        goto fail;
+    }
+
+    dirname = qemu_opt_get(opts, "dir");
+    if (!dirname) {
+        qerror_report(ERROR_CLASS_GENERIC_ERROR, "vvfat block driver requires "
+                      "a 'dir' option");
+        ret = -EINVAL;
+        goto fail;
+    }
+
+    s->fat_type = qemu_opt_get_number(opts, "fat-type", 0);
+    floppy = qemu_opt_get_bool(opts, "floppy", false);
+
+    if (floppy) {
+        /* 1.44MB or 2.88MB floppy.  2.88MB can be FAT12 (default) or FAT16. */
+        if (!s->fat_type) {
+            s->fat_type = 12;
+            secs = 36;
+            s->sectors_per_cluster = 2;
+        } else {
+            secs = s->fat_type == 12 ? 18 : 36;
+            s->sectors_per_cluster = 1;
+        }
+        s->first_sectors_number = 1;
+        cyls = 80;
+        heads = 2;
+    } else {
+        /* 32MB or 504MB disk*/
+        if (!s->fat_type) {
+            s->fat_type = 16;
+        }
+        cyls = s->fat_type == 12 ? 64 : 1024;
+        heads = 16;
+        secs = 63;
+    }
+
+    switch (s->fat_type) {
+    case 32:
+	    fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. "
+                "You are welcome to do so!\n");
+        break;
+    case 16:
+    case 12:
+        break;
+    default:
+        qerror_report(ERROR_CLASS_GENERIC_ERROR, "Valid FAT types are only "
+                      "12, 16 and 32");
+        ret = -EINVAL;
+        goto fail;
+    }
+
+
     s->bs = bs;
 
     /* LATER TODO: if FAT32, adjust */
@@ -1018,63 +1158,24 @@
     s->fat2 = NULL;
     s->downcase_short_names = 1;
 
-    if (!strstart(dirname, "fat:", NULL))
-	return -1;
-
-    if (strstr(dirname, ":32:")) {
-	fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. You are welcome to do so!\n");
-	s->fat_type = 32;
-    } else if (strstr(dirname, ":16:")) {
-	s->fat_type = 16;
-    } else if (strstr(dirname, ":12:")) {
-	s->fat_type = 12;
-    }
-
-    if (strstr(dirname, ":floppy:")) {
-	/* 1.44MB or 2.88MB floppy.  2.88MB can be FAT12 (default) or FAT16. */
-	if (!s->fat_type) {
-	    s->fat_type = 12;
-            secs = 36;
-	    s->sectors_per_cluster=2;
-	} else {
-            secs = s->fat_type == 12 ? 18 : 36;
-	    s->sectors_per_cluster=1;
-	}
-	s->first_sectors_number = 1;
-        cyls = 80;
-        heads = 2;
-    } else {
-	/* 32MB or 504MB disk*/
-	if (!s->fat_type) {
-	    s->fat_type = 16;
-	}
-        cyls = s->fat_type == 12 ? 64 : 1024;
-        heads = 16;
-        secs = 63;
-    }
     fprintf(stderr, "vvfat %s chs %d,%d,%d\n",
             dirname, cyls, heads, secs);
 
     s->sector_count = cyls * heads * secs - (s->first_sectors_number - 1);
 
-    if (strstr(dirname, ":rw:")) {
-	if (enable_write_target(s))
-	    return -1;
-	bs->read_only = 0;
+    if (qemu_opt_get_bool(opts, "rw", false)) {
+        if (enable_write_target(s)) {
+            ret = -EIO;
+            goto fail;
+        }
+        bs->read_only = 0;
     }
 
-    i = strrchr(dirname, ':') - dirname;
-    assert(i >= 3);
-    if (dirname[i-2] == ':' && qemu_isalpha(dirname[i-1]))
-	/* workaround for DOS drive names */
-	dirname += i-1;
-    else
-	dirname += i+1;
-
     bs->total_sectors = cyls * heads * secs;
 
     if (init_directories(s, dirname, heads, secs)) {
-	return -1;
+        ret = -EIO;
+        goto fail;
     }
 
     s->sector_count = s->faked_sectors + s->sectors_per_cluster*s->cluster_count;
@@ -1094,7 +1195,10 @@
         migrate_add_blocker(s->migration_blocker);
     }
 
-    return 0;
+    ret = 0;
+fail:
+    qemu_opts_del(opts);
+    return ret;
 }
 
 static inline void vvfat_close_current_file(BDRVVVFATState *s)
@@ -2866,15 +2970,18 @@
 }
 
 static BlockDriver bdrv_vvfat = {
-    .format_name	= "vvfat",
-    .instance_size	= sizeof(BDRVVVFATState),
-    .bdrv_file_open	= vvfat_open,
-    .bdrv_rebind	= vvfat_rebind,
-    .bdrv_read          = vvfat_co_read,
-    .bdrv_write         = vvfat_co_write,
-    .bdrv_close		= vvfat_close,
-    .bdrv_co_is_allocated = vvfat_co_is_allocated,
-    .protocol_name	= "fat",
+    .format_name            = "vvfat",
+    .protocol_name          = "fat",
+    .instance_size          = sizeof(BDRVVVFATState),
+
+    .bdrv_parse_filename    = vvfat_parse_filename,
+    .bdrv_file_open         = vvfat_open,
+    .bdrv_close             = vvfat_close,
+    .bdrv_rebind            = vvfat_rebind,
+
+    .bdrv_read              = vvfat_co_read,
+    .bdrv_write             = vvfat_co_write,
+    .bdrv_co_is_allocated   = vvfat_co_is_allocated,
 };
 
 static void bdrv_vvfat_init(void)
diff --git a/include/block/block.h b/include/block/block.h
index ebd9512..1251c5c 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -137,7 +137,7 @@
 int bdrv_parse_discard_flags(const char *mode, int *flags);
 int bdrv_file_open(BlockDriverState **pbs, const char *filename,
                    QDict *options, int flags);
-int bdrv_open_backing_file(BlockDriverState *bs);
+int bdrv_open_backing_file(BlockDriverState *bs, QDict *options);
 int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
               int flags, BlockDriver *drv);
 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 458cde3..6078dd3 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -87,8 +87,7 @@
     void (*bdrv_reopen_abort)(BDRVReopenState *reopen_state);
 
     int (*bdrv_open)(BlockDriverState *bs, QDict *options, int flags);
-    int (*bdrv_file_open)(BlockDriverState *bs, const char *filename,
-                          QDict *options, int flags);
+    int (*bdrv_file_open)(BlockDriverState *bs, QDict *options, int flags);
     int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
                      uint8_t *buf, int nb_sectors);
     int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
diff --git a/qemu-img.c b/qemu-img.c
index 31627b0..cd096a1 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1425,12 +1425,8 @@
             }
             assert (remainder == 0);
 
-            if (n < cluster_sectors) {
-                memset(buf + n * 512, 0, cluster_size - n * 512);
-            }
-            if (!buffer_is_zero(buf, cluster_size)) {
-                ret = bdrv_write_compressed(out_bs, sector_num, buf,
-                                            cluster_sectors);
+            if (!buffer_is_zero(buf, n * BDRV_SECTOR_SIZE)) {
+                ret = bdrv_write_compressed(out_bs, sector_num, buf, n);
                 if (ret != 0) {
                     error_report("error while compressing sector %" PRId64
                                  ": %s", sector_num, strerror(-ret));
diff --git a/tests/qemu-iotests/051 b/tests/qemu-iotests/051
index 8b51de3..8039e23 100755
--- a/tests/qemu-iotests/051
+++ b/tests/qemu-iotests/051
@@ -142,6 +142,13 @@
 run_qemu -drive media=cdrom,cache=unsafe
 run_qemu -drive media=cdrom,cache=invalid_value
 
+echo
+echo === Specifying the protocol layer ===
+echo
+
+run_qemu -drive file=$TEST_IMG,file.driver=file
+run_qemu -drive file=$TEST_IMG,file.driver=qcow2
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/051.out b/tests/qemu-iotests/051.out
index 48456d5..3d1ac7b 100644
--- a/tests/qemu-iotests/051.out
+++ b/tests/qemu-iotests/051.out
@@ -159,4 +159,14 @@
 Testing: -drive media=cdrom,cache=invalid_value
 QEMU_PROG: -drive media=cdrom,cache=invalid_value: invalid cache option
 
+
+=== Specifying the protocol layer ===
+
+Testing: -drive file=TEST_DIR/t.qcow2,file.driver=file
+q[K[Dqu[K[D[Dqui[K[D[D[Dquit[K
+
+Testing: -drive file=TEST_DIR/t.qcow2,file.driver=qcow2
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,file.driver=qcow2: Can't use 'qcow2' as a block driver for the protocol level
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,file.driver=qcow2: could not open disk image TEST_DIR/t.qcow2: Invalid argument
+
 *** done
diff --git a/tests/qemu-iotests/053 b/tests/qemu-iotests/053
new file mode 100755
index 0000000..bc56992
--- /dev/null
+++ b/tests/qemu-iotests/053
@@ -0,0 +1,73 @@
+#!/bin/bash
+#
+# Test qemu-img convert when image length is not a multiple of cluster size
+#
+# Copyright (C) 2013 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=stefanha@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+_cleanup()
+{
+	rm -f $TEST_IMG.orig
+	_cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt qcow2 qcow
+_supported_proto file
+_supported_os Linux
+
+echo
+echo "== Creating single sector image =="
+
+_make_test_img 512
+$QEMU_IO -c "write -P0xa 0 512" $TEST_IMG | _filter_qemu_io
+mv $TEST_IMG $TEST_IMG.orig
+
+echo
+echo "== Converting the image, compressed =="
+
+$QEMU_IMG convert -c -O $IMGFMT $TEST_IMG.orig $TEST_IMG
+_check_test_img
+
+echo
+echo "== Checking compressed image virtual disk size =="
+
+_img_info | grep '^virtual size:'
+
+echo
+echo "== Verifying the compressed image =="
+
+$QEMU_IO -c "read -P0xa 0 512" $TEST_IMG | _filter_qemu_io
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0
+
diff --git a/tests/qemu-iotests/053.out b/tests/qemu-iotests/053.out
new file mode 100644
index 0000000..16464e6
--- /dev/null
+++ b/tests/qemu-iotests/053.out
@@ -0,0 +1,17 @@
+QA output created by 053
+
+== Creating single sector image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=512 
+wrote 512/512 bytes at offset 0
+512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image, compressed ==
+No errors were found on the image.
+
+== Checking compressed image virtual disk size ==
+virtual size: 512 (512 bytes)
+
+== Verifying the compressed image ==
+read 512/512 bytes at offset 0
+512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+*** done
diff --git a/tests/qemu-iotests/common.filter b/tests/qemu-iotests/common.filter
index bc5f250..dcf6391 100644
--- a/tests/qemu-iotests/common.filter
+++ b/tests/qemu-iotests/common.filter
@@ -155,7 +155,7 @@
 # replace occurrences of QEMU_PROG with "qemu"
 _filter_qemu()
 {
-    sed -e "s#$(basename $QEMU_PROG)#QEMU_PROG#g"
+    sed -e "s#^$(basename $QEMU_PROG):#QEMU_PROG:#"
 }
 
 # make sure this script returns success
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 324bacb..68eabda 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -59,3 +59,4 @@
 050 rw auto backing quick
 051 rw auto
 052 rw auto backing
+053 rw auto