Merge remote-tracking branch 'remotes/maxreitz/tags/pull-block-2016-09-20' into staging

Block patches for 2.8

# gpg: Signature made Tue 20 Sep 2016 21:29:53 BST
# gpg:                using RSA key 0xF407DB0061D5CF40
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>"
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* remotes/maxreitz/tags/pull-block-2016-09-20:
  iotest 055: refactor and speed up
  commit: get the overlay node before manipulating the backing chain
  blockdev: Modularize nfs block driver
  blockdev: Add dynamic module loading for block drivers
  blockdev: Add dynamic generation of module_block.h
  blockdev: prepare iSCSI block driver for dynamic loading
  qemu-img: add skip option to dd
  qemu-img: add the 'dd' subcommand

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

23 files changed, 997 insertions, 118 deletions

diff --git a/Makefile b/Makefile
index 444ae37bd3..f10361675d 100644
--- a/Makefile
+++ b/Makefile
@@ -76,6 +76,8 @@ GENERATED_HEADERS += trace/generated-ust-provider.h
 GENERATED_SOURCES += trace/generated-ust.c
 endif
 
+GENERATED_HEADERS += module_block.h
+
 # Don't try to regenerate Makefile or configure
 # We don't generate any of them
 Makefile: ;
@@ -245,9 +247,6 @@ Makefile: $(version-obj-y) $(version-lobj-y)
 libqemustub.a: $(stub-obj-y)
 libqemuutil.a: $(util-obj-y)
 
-block-modules = $(foreach o,$(block-obj-m),"$(basename $(subst /,-,$o))",) NULL
-util/module.o-cflags = -D'CONFIG_BLOCK_MODULES=$(block-modules)'
-
 ######################################################################
 
 qemu-img.o: qemu-img-cmds.h
@@ -352,6 +351,11 @@ ivshmem-client$(EXESUF): $(ivshmem-client-obj-y) libqemuutil.a libqemustub.a
 ivshmem-server$(EXESUF): $(ivshmem-server-obj-y) libqemuutil.a libqemustub.a
 	$(call LINK, $^)
 
+module_block.h: $(SRC_PATH)/scripts/modules/module_block.py config-host.mak
+	$(call quiet-command,$(PYTHON) $< $@ \
+	$(addprefix $(SRC_PATH)/,$(patsubst %.mo,%.c,$(block-obj-m))), \
+	"  GEN   $@")
+
 clean:
 # avoid old build problems by removing potentially incorrect old files
 	rm -f config.mak op-i386.h opc-i386.h gen-op-i386.h op-arm.h opc-arm.h gen-op-arm.h
diff --git a/block.c b/block.c
index 66ed1c0321..afaff93423 100644
--- a/block.c
+++ b/block.c
@@ -27,6 +27,7 @@
 #include "block/blockjob.h"
 #include "block/nbd.h"
 #include "qemu/error-report.h"
+#include "module_block.h"
 #include "qemu/module.h"
 #include "qapi/qmp/qerror.h"
 #include "qapi/qmp/qbool.h"
@@ -242,17 +243,40 @@ BlockDriverState *bdrv_new(void)
     return bs;
 }
 
-BlockDriver *bdrv_find_format(const char *format_name)
+static BlockDriver *bdrv_do_find_format(const char *format_name)
 {
     BlockDriver *drv1;
+
     QLIST_FOREACH(drv1, &bdrv_drivers, list) {
         if (!strcmp(drv1->format_name, format_name)) {
             return drv1;
         }
     }
+
     return NULL;
 }
 
+BlockDriver *bdrv_find_format(const char *format_name)
+{
+    BlockDriver *drv1;
+    int i;
+
+    drv1 = bdrv_do_find_format(format_name);
+    if (drv1) {
+        return drv1;
+    }
+
+    /* The driver isn't registered, maybe we need to load a module */
+    for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) {
+        if (!strcmp(block_driver_modules[i].format_name, format_name)) {
+            block_module_load_one(block_driver_modules[i].library_name);
+            break;
+        }
+    }
+
+    return bdrv_do_find_format(format_name);
+}
+
 static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only)
 {
     static const char *whitelist_rw[] = {
@@ -461,6 +485,19 @@ static BlockDriver *find_hdev_driver(const char *filename)
     return drv;
 }
 
+static BlockDriver *bdrv_do_find_protocol(const char *protocol)
+{
+    BlockDriver *drv1;
+
+    QLIST_FOREACH(drv1, &bdrv_drivers, list) {
+        if (drv1->protocol_name && !strcmp(drv1->protocol_name, protocol)) {
+            return drv1;
+        }
+    }
+
+    return NULL;
+}
+
 BlockDriver *bdrv_find_protocol(const char *filename,
                                 bool allow_protocol_prefix,
                                 Error **errp)
@@ -469,6 +506,7 @@ BlockDriver *bdrv_find_protocol(const char *filename,
     char protocol[128];
     int len;
     const char *p;
+    int i;
 
     /* TODO Drivers without bdrv_file_open must be specified explicitly */
 
@@ -495,15 +533,25 @@ BlockDriver *bdrv_find_protocol(const char *filename,
         len = sizeof(protocol) - 1;
     memcpy(protocol, filename, len);
     protocol[len] = '\0';
-    QLIST_FOREACH(drv1, &bdrv_drivers, list) {
-        if (drv1->protocol_name &&
-            !strcmp(drv1->protocol_name, protocol)) {
-            return drv1;
+
+    drv1 = bdrv_do_find_protocol(protocol);
+    if (drv1) {
+        return drv1;
+    }
+
+    for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) {
+        if (block_driver_modules[i].protocol_name &&
+            !strcmp(block_driver_modules[i].protocol_name, protocol)) {
+            block_module_load_one(block_driver_modules[i].library_name);
+            break;
         }
     }
 
-    error_setg(errp, "Unknown protocol '%s'", protocol);
-    return NULL;
+    drv1 = bdrv_do_find_protocol(protocol);
+    if (!drv1) {
+        error_setg(errp, "Unknown protocol '%s'", protocol);
+    }
+    return drv1;
 }
 
 /*
diff --git a/block/Makefile.objs b/block/Makefile.objs
index 55da6266fe..cb158e9275 100644
--- a/block/Makefile.objs
+++ b/block/Makefile.objs
@@ -1,4 +1,4 @@
-block-obj-y += raw_bsd.o qcow.o vdi.o vmdk.o cloop.o bochs.o vpc.o vvfat.o
+block-obj-y += raw_bsd.o qcow.o vdi.o vmdk.o cloop.o bochs.o vpc.o vvfat.o dmg.o
 block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o
 block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o
 block-obj-y += qed-check.o
@@ -29,6 +29,7 @@ block-obj-y += crypto.o
 
 common-obj-y += stream.o
 
+nfs.o-libs         := $(LIBNFS_LIBS)
 iscsi.o-cflags     := $(LIBISCSI_CFLAGS)
 iscsi.o-libs       := $(LIBISCSI_LIBS)
 curl.o-cflags      := $(CURL_CFLAGS)
@@ -40,7 +41,6 @@ gluster.o-libs     := $(GLUSTERFS_LIBS)
 ssh.o-cflags       := $(LIBSSH2_CFLAGS)
 ssh.o-libs         := $(LIBSSH2_LIBS)
 archipelago.o-libs := $(ARCHIPELAGO_LIBS)
-block-obj-m        += dmg.o
 dmg.o-libs         := $(BZIP2_LIBS)
 qcow.o-libs        := -lz
 linux-aio.o-libs   := -laio
diff --git a/block/commit.c b/block/commit.c
index 553e18da52..a02539bacc 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -83,7 +83,7 @@ static void commit_complete(BlockJob *job, void *opaque)
     BlockDriverState *active = s->active;
     BlockDriverState *top = blk_bs(s->top);
     BlockDriverState *base = blk_bs(s->base);
-    BlockDriverState *overlay_bs;
+    BlockDriverState *overlay_bs = bdrv_find_overlay(active, top);
     int ret = data->ret;
 
     if (!block_job_is_cancelled(&s->common) && ret == 0) {
@@ -97,7 +97,6 @@ static void commit_complete(BlockJob *job, void *opaque)
     if (s->base_flags != bdrv_get_flags(base)) {
         bdrv_reopen(base, s->base_flags, NULL);
     }
-    overlay_bs = bdrv_find_overlay(active, top);
     if (overlay_bs && s->orig_overlay_flags != bdrv_get_flags(overlay_bs)) {
         bdrv_reopen(overlay_bs, s->orig_overlay_flags, NULL);
     }
diff --git a/block/iscsi.c b/block/iscsi.c
index 95ce9e139e..c4a0937419 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -2010,45 +2010,9 @@ static BlockDriver bdrv_iscsi = {
     .bdrv_attach_aio_context = iscsi_attach_aio_context,
 };
 
-static QemuOptsList qemu_iscsi_opts = {
-    .name = "iscsi",
-    .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head),
-    .desc = {
-        {
-            .name = "user",
-            .type = QEMU_OPT_STRING,
-            .help = "username for CHAP authentication to target",
-        },{
-            .name = "password",
-            .type = QEMU_OPT_STRING,
-            .help = "password for CHAP authentication to target",
-        },{
-            .name = "password-secret",
-            .type = QEMU_OPT_STRING,
-            .help = "ID of the secret providing password for CHAP "
-                    "authentication to target",
-        },{
-            .name = "header-digest",
-            .type = QEMU_OPT_STRING,
-            .help = "HeaderDigest setting. "
-                    "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}",
-        },{
-            .name = "initiator-name",
-            .type = QEMU_OPT_STRING,
-            .help = "Initiator iqn name to use when connecting",
-        },{
-            .name = "timeout",
-            .type = QEMU_OPT_NUMBER,
-            .help = "Request timeout in seconds (default 0 = no timeout)",
-        },
-        { /* end of list */ }
-    },
-};
-
 static void iscsi_block_init(void)
 {
     bdrv_register(&bdrv_iscsi);
-    qemu_add_opts(&qemu_iscsi_opts);
 }
 
 block_init(iscsi_block_init);
diff --git a/configure b/configure
index 7d083bdd85..2efc3382e1 100755
--- a/configure
+++ b/configure
@@ -4578,7 +4578,6 @@ if test "$libnfs" != "no" ; then
   if $pkg_config --atleast-version=1.9.3 libnfs; then
     libnfs="yes"
     libnfs_libs=$($pkg_config --libs libnfs)
-    LIBS="$LIBS $libnfs_libs"
   else
     if test "$libnfs" = "yes" ; then
       feature_not_found "libnfs" "Install libnfs devel >= 1.9.3"
@@ -5351,7 +5350,8 @@ if test "$libiscsi" = "yes" ; then
 fi
 
 if test "$libnfs" = "yes" ; then
-  echo "CONFIG_LIBNFS=y" >> $config_host_mak
+  echo "CONFIG_LIBNFS=m" >> $config_host_mak
+  echo "LIBNFS_LIBS=$libnfs_libs" >> $config_host_mak
 fi
 
 if test "$seccomp" = "yes"; then
diff --git a/include/qemu/module.h b/include/qemu/module.h
index 2370708445..dc2c9d4c4e 100644
--- a/include/qemu/module.h
+++ b/include/qemu/module.h
@@ -52,9 +52,12 @@ typedef enum {
 #define qapi_init(function) module_init(function, MODULE_INIT_QAPI)
 #define type_init(function) module_init(function, MODULE_INIT_QOM)
 
+#define block_module_load_one(lib) module_load_one("block-", lib)
+
 void register_module_init(void (*fn)(void), module_init_type type);
 void register_dso_module_init(void (*fn)(void), module_init_type type);
 
 void module_call_init(module_init_type type);
+void module_load_one(const char *prefix, const char *lib_name);
 
 #endif
diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
index 7e95b2da79..f054599a91 100644
--- a/qemu-img-cmds.hx
+++ b/qemu-img-cmds.hx
@@ -45,6 +45,12 @@ STEXI
 @item convert [--object @var{objectdef}] [--image-opts] [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{src_cache}] [-O @var{output_fmt}] [-o @var{options}] [-s @var{snapshot_id_or_name}] [-l @var{snapshot_param}] [-S @var{sparse_size}] @var{filename} [@var{filename2} [...]] @var{output_filename}
 ETEXI
 
+DEF("dd", img_dd,
+    "dd [--image-opts] [-f fmt] [-O output_fmt] [bs=block_size] [count=blocks] [skip=blocks] if=input of=output")
+STEXI
+@item dd [--image-opts] [-f @var{fmt}] [-O @var{output_fmt}] [bs=@var{block_size}] [count=@var{blocks}] [skip=@var{blocks}] if=@var{input} of=@var{output}
+ETEXI
+
 DEF("info", img_info,
     "info [--object objectdef] [--image-opts] [-f fmt] [--output=ofmt] [--backing-chain] filename")
 STEXI
diff --git a/qemu-img.c b/qemu-img.c
index ea52486e81..ceffefeacb 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -166,7 +166,15 @@ static void QEMU_NORETURN help(void)
            "Parameters to compare subcommand:\n"
            "  '-f' first image format\n"
            "  '-F' second image format\n"
-           "  '-s' run in Strict mode - fail on different image size or sector allocation\n";
+           "  '-s' run in Strict mode - fail on different image size or sector allocation\n"
+           "\n"
+           "Parameters to dd subcommand:\n"
+           "  'bs=BYTES' read and write up to BYTES bytes at a time "
+           "(default: 512)\n"
+           "  'count=N' copy only N input blocks\n"
+           "  'if=FILE' read from FILE\n"
+           "  'of=FILE' write to FILE\n"
+           "  'skip=N' skip N bs-sized blocks at the start of input\n";
 
     printf("%s\nSupported formats:", help_msg);
     bdrv_iterate_format(format_print, NULL);
@@ -3796,6 +3804,339 @@ out:
     return 0;
 }
 
+#define C_BS      01
+#define C_COUNT   02
+#define C_IF      04
+#define C_OF      010
+#define C_SKIP    020
+
+struct DdInfo {
+    unsigned int flags;
+    int64_t count;
+};
+
+struct DdIo {
+    int bsz;    /* Block size */
+    char *filename;
+    uint8_t *buf;
+    int64_t offset;
+};
+
+struct DdOpts {
+    const char *name;
+    int (*f)(const char *, struct DdIo *, struct DdIo *, struct DdInfo *);
+    unsigned int flag;
+};
+
+static int img_dd_bs(const char *arg,
+                     struct DdIo *in, struct DdIo *out,
+                     struct DdInfo *dd)
+{
+    char *end;
+    int64_t res;
+
+    res = qemu_strtosz_suffix(arg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
+
+    if (res <= 0 || res > INT_MAX || *end) {
+        error_report("invalid number: '%s'", arg);
+        return 1;
+    }
+    in->bsz = out->bsz = res;
+
+    return 0;
+}
+
+static int img_dd_count(const char *arg,
+                        struct DdIo *in, struct DdIo *out,
+                        struct DdInfo *dd)
+{
+    char *end;
+
+    dd->count = qemu_strtosz_suffix(arg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
+
+    if (dd->count < 0 || *end) {
+        error_report("invalid number: '%s'", arg);
+        return 1;
+    }
+
+    return 0;
+}
+
+static int img_dd_if(const char *arg,
+                     struct DdIo *in, struct DdIo *out,
+                     struct DdInfo *dd)
+{
+    in->filename = g_strdup(arg);
+
+    return 0;
+}
+
+static int img_dd_of(const char *arg,
+                     struct DdIo *in, struct DdIo *out,
+                     struct DdInfo *dd)
+{
+    out->filename = g_strdup(arg);
+
+    return 0;
+}
+
+static int img_dd_skip(const char *arg,
+                       struct DdIo *in, struct DdIo *out,
+                       struct DdInfo *dd)
+{
+    char *end;
+
+    in->offset = qemu_strtosz_suffix(arg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
+
+    if (in->offset < 0 || *end) {
+        error_report("invalid number: '%s'", arg);
+        return 1;
+    }
+
+    return 0;
+}
+
+static int img_dd(int argc, char **argv)
+{
+    int ret = 0;
+    char *arg = NULL;
+    char *tmp;
+    BlockDriver *drv = NULL, *proto_drv = NULL;
+    BlockBackend *blk1 = NULL, *blk2 = NULL;
+    QemuOpts *opts = NULL;
+    QemuOptsList *create_opts = NULL;
+    Error *local_err = NULL;
+    bool image_opts = false;
+    int c, i;
+    const char *out_fmt = "raw";
+    const char *fmt = NULL;
+    int64_t size = 0;
+    int64_t block_count = 0, out_pos, in_pos;
+    struct DdInfo dd = {
+        .flags = 0,
+        .count = 0,
+    };
+    struct DdIo in = {
+        .bsz = 512, /* Block size is by default 512 bytes */
+        .filename = NULL,
+        .buf = NULL,
+        .offset = 0
+    };
+    struct DdIo out = {
+        .bsz = 512,
+        .filename = NULL,
+        .buf = NULL,
+        .offset = 0
+    };
+
+    const struct DdOpts options[] = {
+        { "bs", img_dd_bs, C_BS },
+        { "count", img_dd_count, C_COUNT },
+        { "if", img_dd_if, C_IF },
+        { "of", img_dd_of, C_OF },
+        { "skip", img_dd_skip, C_SKIP },
+        { NULL, NULL, 0 }
+    };
+    const struct option long_options[] = {
+        { "help", no_argument, 0, 'h'},
+        { "image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+        { 0, 0, 0, 0 }
+    };
+
+    while ((c = getopt_long(argc, argv, "hf:O:", long_options, NULL))) {
+        if (c == EOF) {
+            break;
+        }
+        switch (c) {
+        case 'O':
+            out_fmt = optarg;
+            break;
+        case 'f':
+            fmt = optarg;
+            break;
+        case '?':
+            error_report("Try 'qemu-img --help' for more information.");
+            ret = -1;
+            goto out;
+        case 'h':
+            help();
+            break;
+        case OPTION_IMAGE_OPTS:
+            image_opts = true;
+            break;
+        }
+    }
+
+    for (i = optind; i < argc; i++) {
+        int j;
+        arg = g_strdup(argv[i]);
+
+        tmp = strchr(arg, '=');
+        if (tmp == NULL) {
+            error_report("unrecognized operand %s", arg);
+            ret = -1;
+            goto out;
+        }
+
+        *tmp++ = '\0';
+
+        for (j = 0; options[j].name != NULL; j++) {
+            if (!strcmp(arg, options[j].name)) {
+                break;
+            }
+        }
+        if (options[j].name == NULL) {
+            error_report("unrecognized operand %s", arg);
+            ret = -1;
+            goto out;
+        }
+
+        if (options[j].f(tmp, &in, &out, &dd) != 0) {
+            ret = -1;
+            goto out;
+        }
+        dd.flags |= options[j].flag;
+        g_free(arg);
+        arg = NULL;
+    }
+
+    if (!(dd.flags & C_IF && dd.flags & C_OF)) {
+        error_report("Must specify both input and output files");
+        ret = -1;
+        goto out;
+    }
+    blk1 = img_open(image_opts, in.filename, fmt, 0, false, false);
+
+    if (!blk1) {
+        ret = -1;
+        goto out;
+    }
+
+    drv = bdrv_find_format(out_fmt);
+    if (!drv) {
+        error_report("Unknown file format");
+        ret = -1;
+        goto out;
+    }
+    proto_drv = bdrv_find_protocol(out.filename, true, &local_err);
+
+    if (!proto_drv) {
+        error_report_err(local_err);
+        ret = -1;
+        goto out;
+    }
+    if (!drv->create_opts) {
+        error_report("Format driver '%s' does not support image creation",
+                     drv->format_name);
+        ret = -1;
+        goto out;
+    }
+    if (!proto_drv->create_opts) {
+        error_report("Protocol driver '%s' does not support image creation",
+                     proto_drv->format_name);
+        ret = -1;
+        goto out;
+    }
+    create_opts = qemu_opts_append(create_opts, drv->create_opts);
+    create_opts = qemu_opts_append(create_opts, proto_drv->create_opts);
+
+    opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
+
+    size = blk_getlength(blk1);
+    if (size < 0) {
+        error_report("Failed to get size for '%s'", in.filename);
+        ret = -1;
+        goto out;
+    }
+
+    if (dd.flags & C_COUNT && dd.count <= INT64_MAX / in.bsz &&
+        dd.count * in.bsz < size) {
+        size = dd.count * in.bsz;
+    }
+
+    /* Overflow means the specified offset is beyond input image's size */
+    if (dd.flags & C_SKIP && (in.offset > INT64_MAX / in.bsz ||
+                              size < in.bsz * in.offset)) {
+        qemu_opt_set_number(opts, BLOCK_OPT_SIZE, 0, &error_abort);
+    } else {
+        qemu_opt_set_number(opts, BLOCK_OPT_SIZE,
+                            size - in.bsz * in.offset, &error_abort);
+    }
+
+    ret = bdrv_create(drv, out.filename, opts, &local_err);
+    if (ret < 0) {
+        error_reportf_err(local_err,
+                          "%s: error while creating output image: ",
+                          out.filename);
+        ret = -1;
+        goto out;
+    }
+
+    blk2 = img_open(image_opts, out.filename, out_fmt, BDRV_O_RDWR,
+                    false, false);
+
+    if (!blk2) {
+        ret = -1;
+        goto out;
+    }
+
+    if (dd.flags & C_SKIP && (in.offset > INT64_MAX / in.bsz ||
+                              size < in.offset * in.bsz)) {
+        /* We give a warning if the skip option is bigger than the input
+         * size and create an empty output disk image (i.e. like dd(1)).
+         */
+        error_report("%s: cannot skip to specified offset", in.filename);
+        in_pos = size;
+    } else {
+        in_pos = in.offset * in.bsz;
+    }
+
+    in.buf = g_new(uint8_t, in.bsz);
+
+    for (out_pos = 0; in_pos < size; block_count++) {
+        int in_ret, out_ret;
+
+        if (in_pos + in.bsz > size) {
+            in_ret = blk_pread(blk1, in_pos, in.buf, size - in_pos);
+        } else {
+            in_ret = blk_pread(blk1, in_pos, in.buf, in.bsz);
+        }
+        if (in_ret < 0) {
+            error_report("error while reading from input image file: %s",
+                         strerror(-in_ret));
+            ret = -1;
+            goto out;
+        }
+        in_pos += in_ret;
+
+        out_ret = blk_pwrite(blk2, out_pos, in.buf, in_ret, 0);
+
+        if (out_ret < 0) {
+            error_report("error while writing to output image file: %s",
+                         strerror(-out_ret));
+            ret = -1;
+            goto out;
+        }
+        out_pos += out_ret;
+    }
+
+out:
+    g_free(arg);
+    qemu_opts_del(opts);
+    qemu_opts_free(create_opts);
+    blk_unref(blk1);
+    blk_unref(blk2);
+    g_free(in.filename);
+    g_free(out.filename);
+    g_free(in.buf);
+    g_free(out.buf);
+
+    if (ret) {
+        return 1;
+    }
+    return 0;
+}
+
 
 static const img_cmd_t img_cmds[] = {
 #define DEF(option, callback, arg_string)        \
diff --git a/qemu-img.texi b/qemu-img.texi
index 449a19c710..174aae38b7 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -139,6 +139,22 @@ Parameters to convert subcommand:
 Skip the creation of the target volume
 @end table
 
+Parameters to dd subcommand:
+
+@table @option
+
+@item bs=@var{block_size}
+defines the block size
+@item count=@var{blocks}
+sets the number of input blocks to copy
+@item if=@var{input}
+sets the input file
+@item of=@var{output}
+sets the output file
+@item skip=@var{blocks}
+sets the number of input blocks to skip
+@end table
+
 Command description:
 
 @table @option
@@ -310,6 +326,17 @@ skipped. This is useful for formats such as @code{rbd} if the target
 volume has already been created with site specific options that cannot
 be supplied through qemu-img.
 
+@item dd [-f @var{fmt}] [-O @var{output_fmt}] [bs=@var{block_size}] [count=@var{blocks}] [skip=@var{blocks}] if=@var{input} of=@var{output}
+
+Dd copies from @var{input} file to @var{output} file converting it from
+@var{fmt} format to @var{output_fmt} format.
+
+The data is by default read and written using blocks of 512 bytes but can be
+modified by specifying @var{block_size}. If count=@var{blocks} is specified
+dd will stop reading input after reading @var{blocks} input blocks.
+
+The size syntax is similar to dd(1)'s size syntax.
+
 @item info [-f @var{fmt}] [--output=@var{ofmt}] [--backing-chain] @var{filename}
 
 Give information about the disk image @var{filename}. Use it in
diff --git a/scripts/modules/module_block.py b/scripts/modules/module_block.py
new file mode 100644
index 0000000000..db4fb540cd
--- /dev/null
+++ b/scripts/modules/module_block.py
@@ -0,0 +1,108 @@
+#!/usr/bin/python
+#
+# Module information generator
+#
+# Copyright Red Hat, Inc. 2015 - 2016
+#
+# Authors:
+#  Marc Mari <markmb@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2.
+# See the COPYING file in the top-level directory.
+
+from __future__ import print_function
+import sys
+import os
+
+def get_string_struct(line):
+    data = line.split()
+
+    # data[0] -> struct element name
+    # data[1] -> =
+    # data[2] -> value
+
+    return data[2].replace('"', '')[:-1]
+
+def add_module(fheader, library, format_name, protocol_name):
+    lines = []
+    lines.append('.library_name = "' + library + '",')
+    if format_name != "":
+        lines.append('.format_name = "' + format_name + '",')
+    if protocol_name != "":
+        lines.append('.protocol_name = "' + protocol_name + '",')
+
+    text = '\n        '.join(lines)
+    fheader.write('\n    {\n        ' + text + '\n    },')
+
+def process_file(fheader, filename):
+    # This parser assumes the coding style rules are being followed
+    with open(filename, "r") as cfile:
+        found_something = False
+        found_start = False
+        library, _ = os.path.splitext(os.path.basename(filename))
+        for line in cfile:
+            if found_start:
+                line = line.replace('\n', '')
+                if line.find(".format_name") != -1:
+                    format_name = get_string_struct(line)
+                elif line.find(".protocol_name") != -1:
+                    protocol_name = get_string_struct(line)
+                elif line == "};":
+                    add_module(fheader, library, format_name, protocol_name)
+                    found_start = False
+            elif line.find("static BlockDriver") != -1:
+                found_something = True
+                found_start = True
+                format_name = ""
+                protocol_name = ""
+
+        if not found_something:
+            print("No BlockDriver struct found in " + filename + ". \
+                    Is this really a module?", file=sys.stderr)
+            sys.exit(1)
+
+def print_top(fheader):
+    fheader.write('''/* AUTOMATICALLY GENERATED, DO NOT MODIFY */
+/*
+ * QEMU Block Module Infrastructure
+ *
+ * Authors:
+ *  Marc Mari       <markmb@redhat.com>
+ */
+
+''')
+
+    fheader.write('''#ifndef QEMU_MODULE_BLOCK_H
+#define QEMU_MODULE_BLOCK_H
+
+#include "qemu-common.h"
+
+static const struct {
+    const char *format_name;
+    const char *protocol_name;
+    const char *library_name;
+} block_driver_modules[] = {''')
+
+def print_bottom(fheader):
+    fheader.write('''
+};
+
+#endif
+''')
+
+# First argument: output file
+# All other arguments: modules source files (.c)
+output_file = sys.argv[1]
+with open(output_file, 'w') as fheader:
+    print_top(fheader)
+
+    for filename in sys.argv[2:]:
+        if os.path.isfile(filename):
+            process_file(fheader, filename)
+        else:
+            print("File " + filename + " does not exist.", file=sys.stderr)
+            sys.exit(1)
+
+    print_bottom(fheader)
+
+sys.exit(0)
diff --git a/tests/qemu-iotests/055 b/tests/qemu-iotests/055
index ff4535e3ea..1d3fd04b65 100755
--- a/tests/qemu-iotests/055
+++ b/tests/qemu-iotests/055
@@ -29,17 +29,24 @@ test_img = os.path.join(iotests.test_dir, 'test.img')
 target_img = os.path.join(iotests.test_dir, 'target.img')
 blockdev_target_img = os.path.join(iotests.test_dir, 'blockdev-target.img')
 
-class TestSingleDrive(iotests.QMPTestCase):
-    image_len = 64 * 1024 * 1024 # MB
+image_len = 64 * 1024 * 1024 # MB
+
+def setUpModule():
+    qemu_img('create', '-f', iotests.imgfmt, test_img, str(image_len))
+    qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x11 0 64k', test_img)
+    qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x00 64k 128k', test_img)
+    qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x22 162k 32k', test_img)
+    qemu_io('-f', iotests.imgfmt, '-c', 'write -P0xd5 1M 32k', test_img)
+    qemu_io('-f', iotests.imgfmt, '-c', 'write -P0xdc 32M 124k', test_img)
+    qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x33 67043328 64k', test_img)
 
+def tearDownModule():
+    os.remove(test_img)
+
+
+class TestSingleDrive(iotests.QMPTestCase):
     def setUp(self):
-        # Write data to the image so we can compare later
-        qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestSingleDrive.image_len))
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x5d 0 64k', test_img)
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0xd5 1M 32k', test_img)
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0xdc 32M 124k', test_img)
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0xdc 67043328 64k', test_img)
-        qemu_img('create', '-f', iotests.imgfmt, blockdev_target_img, str(TestSingleDrive.image_len))
+        qemu_img('create', '-f', iotests.imgfmt, blockdev_target_img, str(image_len))
 
         self.vm = iotests.VM().add_drive(test_img).add_drive(blockdev_target_img)
         if iotests.qemu_default_machine == 'pc':
@@ -48,7 +55,6 @@ class TestSingleDrive(iotests.QMPTestCase):
 
     def tearDown(self):
         self.vm.shutdown()
-        os.remove(test_img)
         os.remove(blockdev_target_img)
         try:
             os.remove(target_img)
@@ -155,19 +161,14 @@ class TestSingleDrive(iotests.QMPTestCase):
         self.assert_qmp(result, 'error/class', 'GenericError')
 
 class TestSetSpeed(iotests.QMPTestCase):
-    image_len = 80 * 1024 * 1024 # MB
-
     def setUp(self):
-        qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestSetSpeed.image_len))
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P1 0 512', test_img)
-        qemu_img('create', '-f', iotests.imgfmt, blockdev_target_img, str(TestSingleDrive.image_len))
+        qemu_img('create', '-f', iotests.imgfmt, blockdev_target_img, str(image_len))
 
         self.vm = iotests.VM().add_drive(test_img).add_drive(blockdev_target_img)
         self.vm.launch()
 
     def tearDown(self):
         self.vm.shutdown()
-        os.remove(test_img)
         os.remove(blockdev_target_img)
         try:
             os.remove(target_img)
@@ -243,15 +244,8 @@ class TestSetSpeed(iotests.QMPTestCase):
         self.do_test_set_speed_invalid('blockdev-backup',  'drive1')
 
 class TestSingleTransaction(iotests.QMPTestCase):
-    image_len = 64 * 1024 * 1024 # MB
-
     def setUp(self):
-        qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestSingleTransaction.image_len))
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x5d 0 64k', test_img)
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0xd5 1M 32k', test_img)
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0xdc 32M 124k', test_img)
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0xdc 67043328 64k', test_img)
-        qemu_img('create', '-f', iotests.imgfmt, blockdev_target_img, str(TestSingleDrive.image_len))
+        qemu_img('create', '-f', iotests.imgfmt, blockdev_target_img, str(image_len))
 
         self.vm = iotests.VM().add_drive(test_img).add_drive(blockdev_target_img)
         if iotests.qemu_default_machine == 'pc':
@@ -260,7 +254,6 @@ class TestSingleTransaction(iotests.QMPTestCase):
 
     def tearDown(self):
         self.vm.shutdown()
-        os.remove(test_img)
         os.remove(blockdev_target_img)
         try:
             os.remove(target_img)
@@ -454,17 +447,8 @@ class TestDriveCompression(iotests.QMPTestCase):
     fmt_supports_compression = [{'type': 'qcow2', 'args': ()},
                                 {'type': 'vmdk', 'args': ('-o', 'subformat=streamOptimized')}]
 
-    def setUp(self):
-        # Write data to the image so we can compare later
-        qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestDriveCompression.image_len))
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x11 0 64k', test_img)
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x00 64k 128k', test_img)
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x22 162k 32k', test_img)
-        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x33 67043328 64k', test_img)
-
     def tearDown(self):
         self.vm.shutdown()
-        os.remove(test_img)
         os.remove(blockdev_target_img)
         try:
             os.remove(target_img)
diff --git a/tests/qemu-iotests/159 b/tests/qemu-iotests/159
new file mode 100755
index 0000000000..825f05fab8
--- /dev/null
+++ b/tests/qemu-iotests/159
@@ -0,0 +1,70 @@
+#! /bin/bash
+#
+# qemu-img dd test with different block sizes
+#
+# Copyright (C) 2016 Reda Sallahi
+#
+# 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/>.
+#
+
+owner=fullmanet@gmail.com
+
+seq="$(basename $0)"
+echo "QA output created by $seq"
+
+here="$PWD"
+status=1
+
+_cleanup()
+{
+    _cleanup_test_img
+    rm -f "$TEST_IMG.out"
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+. ./common.rc
+. ./common.filter
+. ./common.pattern
+
+_supported_fmt generic
+_supported_proto file
+_supported_os Linux
+
+TEST_SIZES="5 512 1024 1999 1K 64K 1M"
+
+for bs in $TEST_SIZES; do
+    echo
+    echo "== Creating image =="
+
+    size=1M
+    _make_test_img $size
+    _check_test_img
+    $QEMU_IO -c "write -P 0xa 0 $size" "$TEST_IMG" | _filter_qemu_io
+
+    echo
+    echo "== Converting the image with dd with a block size of $bs =="
+
+    $QEMU_IMG dd if="$TEST_IMG" of="$TEST_IMG.out" bs=$bs -O "$IMGFMT"
+    TEST_IMG="$TEST_IMG.out" _check_test_img
+
+    echo
+    echo "== Compare the images with qemu-img compare =="
+
+    $QEMU_IMG compare "$TEST_IMG" "$TEST_IMG.out"
+done
+
+echo
+echo "*** done"
+rm -f "$seq.full"
+status=0
diff --git a/tests/qemu-iotests/159.out b/tests/qemu-iotests/159.out
new file mode 100644
index 0000000000..b86b63abe6
--- /dev/null
+++ b/tests/qemu-iotests/159.out
@@ -0,0 +1,87 @@
+QA output created by 159
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with a block size of 5 ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with a block size of 512 ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with a block size of 1024 ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with a block size of 1999 ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with a block size of 1K ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with a block size of 64K ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with a block size of 1M ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+*** done
diff --git a/tests/qemu-iotests/160 b/tests/qemu-iotests/160
new file mode 100755
index 0000000000..5c910e5bfc
--- /dev/null
+++ b/tests/qemu-iotests/160
@@ -0,0 +1,72 @@
+#! /bin/bash
+#
+# qemu-img dd test for the skip option
+#
+# Copyright (C) 2016 Reda Sallahi
+#
+# 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/>.
+#
+
+owner=fullmanet@gmail.com
+
+seq="$(basename $0)"
+echo "QA output created by $seq"
+
+here="$PWD"
+status=1
+
+_cleanup()
+{
+    _cleanup_test_img
+    rm -f "$TEST_IMG.out" "$TEST_IMG.out.dd"
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+. ./common.rc
+. ./common.filter
+. ./common.pattern
+
+_supported_fmt raw
+_supported_proto file
+_supported_os Linux
+
+TEST_SKIP_BLOCKS="1 2 30 30K"
+
+for skip in $TEST_SKIP_BLOCKS; do
+    echo
+    echo "== Creating image =="
+
+    size=1M
+    _make_test_img $size
+    _check_test_img
+    $QEMU_IO -c "write -P 0xa 24 512k" "$TEST_IMG" | _filter_qemu_io
+
+    echo
+    echo "== Converting the image with dd with skip=$skip =="
+
+    $QEMU_IMG dd if="$TEST_IMG" of="$TEST_IMG.out" skip="$skip" -O "$IMGFMT" \
+        2> /dev/null
+    TEST_IMG="$TEST_IMG.out" _check_test_img
+    dd if="$TEST_IMG" of="$TEST_IMG.out.dd" skip="$skip" status=none
+
+    echo
+    echo "== Compare the images with qemu-img compare =="
+
+    $QEMU_IMG compare "$TEST_IMG.out.dd" "$TEST_IMG.out"
+done
+
+echo
+echo "*** done"
+rm -f "$seq.full"
+status=0
diff --git a/tests/qemu-iotests/160.out b/tests/qemu-iotests/160.out
new file mode 100644
index 0000000000..9cedc80356
--- /dev/null
+++ b/tests/qemu-iotests/160.out
@@ -0,0 +1,51 @@
+QA output created by 160
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 524288/524288 bytes at offset 24
+512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with skip=1 ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 524288/524288 bytes at offset 24
+512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with skip=2 ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 524288/524288 bytes at offset 24
+512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with skip=30 ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 524288/524288 bytes at offset 24
+512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd with skip=30K ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+*** done
diff --git a/tests/qemu-iotests/170 b/tests/qemu-iotests/170
new file mode 100755
index 0000000000..5b335dbc3e
--- /dev/null
+++ b/tests/qemu-iotests/170
@@ -0,0 +1,67 @@
+#! /bin/bash
+#
+# qemu-img dd test
+#
+# Copyright (C) 2016 Reda Sallahi
+#
+# 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/>.
+#
+
+owner=fullmanet@gmail.com
+
+seq="$(basename $0)"
+echo "QA output created by $seq"
+
+here="$PWD"
+status=1
+
+_cleanup()
+{
+    _cleanup_test_img
+    rm -f "$TEST_IMG.out"
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+. ./common.rc
+. ./common.filter
+. ./common.pattern
+
+_supported_fmt generic
+_supported_proto file
+_supported_os Linux
+
+echo
+echo "== Creating image =="
+
+size=1M
+_make_test_img $size
+_check_test_img
+
+$QEMU_IO -c "write -P 0xa 0 $size" "$TEST_IMG" | _filter_qemu_io
+
+echo
+echo "== Converting the image with dd =="
+
+$QEMU_IMG dd if="$TEST_IMG" of="$TEST_IMG.out" -O "$IMGFMT"
+TEST_IMG="$TEST_IMG.out" _check_test_img
+
+echo
+echo "== Compare the images with qemu-img compare =="
+
+$QEMU_IMG compare "$TEST_IMG" "$TEST_IMG.out"
+
+echo
+echo "*** done"
+rm -f "$seq.full"
+status=0
diff --git a/tests/qemu-iotests/170.out b/tests/qemu-iotests/170.out
new file mode 100644
index 0000000000..a83fb82fa7
--- /dev/null
+++ b/tests/qemu-iotests/170.out
@@ -0,0 +1,15 @@
+QA output created by 170
+
+== Creating image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
+No errors were found on the image.
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Converting the image with dd ==
+No errors were found on the image.
+
+== Compare the images with qemu-img compare ==
+Images are identical.
+
+*** done
diff --git a/tests/qemu-iotests/common.filter b/tests/qemu-iotests/common.filter
index 3ab6e4d764..240ed0697a 100644
--- a/tests/qemu-iotests/common.filter
+++ b/tests/qemu-iotests/common.filter
@@ -44,6 +44,15 @@ _filter_imgfmt()
     sed -e "s#$IMGFMT#IMGFMT#g"
 }
 
+# Replace error message when the format is not supported and delete
+# the output lines after the first one
+_filter_qemu_img_check()
+{
+    sed -e '/allocated.*fragmented.*compressed clusters/d' \
+        -e 's/qemu-img: This image format does not support checks/No errors were found on the image./' \
+        -e '/Image end offset: [0-9]\+/d'
+}
+
 # Removes \r from messages
 _filter_win32()
 {
diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index 306b00c210..126bd67043 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -234,10 +234,7 @@ _check_test_img()
         else
             $QEMU_IMG check "$@" -f $IMGFMT "$TEST_IMG" 2>&1
         fi
-    ) | _filter_testdir | \
-        sed -e '/allocated.*fragmented.*compressed clusters/d' \
-            -e 's/qemu-img: This image format does not support checks/No errors were found on the image./' \
-            -e '/Image end offset: [0-9]\+/d'
+    ) | _filter_testdir | _filter_qemu_img_check
 }
 
 _img_info()
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 50ddeed80a..a57fc9218f 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -157,4 +157,7 @@
 155 rw auto
 156 rw auto quick
 157 auto
+159 rw auto quick
+160 rw auto quick
 162 auto quick
+170 rw auto quick
diff --git a/util/module.c b/util/module.c
index 86e3f7aba0..a5f7fbd941 100644
--- a/util/module.c
+++ b/util/module.c
@@ -87,14 +87,11 @@ void register_dso_module_init(void (*fn)(void), module_init_type type)
     QTAILQ_INSERT_TAIL(&dso_init_list, e, node);
 }
 
-static void module_load(module_init_type type);
-
 void module_call_init(module_init_type type)
 {
     ModuleTypeList *l;
     ModuleEntry *e;
 
-    module_load(type);
     l = find_type(type);
 
     QTAILQ_FOREACH(e, l, node) {
@@ -145,6 +142,7 @@ static int module_load_file(const char *fname)
         ret = -EINVAL;
     } else {
         QTAILQ_FOREACH(e, &dso_init_list, node) {
+            e->init();
             register_module_init(e->init, e->type);
         }
         ret = 0;
@@ -159,14 +157,10 @@ out:
 }
 #endif
 
-static void module_load(module_init_type type)
+void module_load_one(const char *prefix, const char *lib_name)
 {
 #ifdef CONFIG_MODULES
     char *fname = NULL;
-    const char **mp;
-    static const char *block_modules[] = {
-        CONFIG_BLOCK_MODULES
-    };
     char *exec_dir;
     char *dirs[3];
     int i = 0;
@@ -177,15 +171,6 @@ static void module_load(module_init_type type)
         return;
     }
 
-    switch (type) {
-    case MODULE_INIT_BLOCK:
-        mp = block_modules;
-        break;
-    default:
-        /* no other types have dynamic modules for now*/
-        return;
-    }
-
     exec_dir = qemu_get_exec_dir();
     dirs[i++] = g_strdup_printf("%s", CONFIG_QEMU_MODDIR);
     dirs[i++] = g_strdup_printf("%s/..", exec_dir ? : "");
@@ -194,16 +179,15 @@ static void module_load(module_init_type type)
     g_free(exec_dir);
     exec_dir = NULL;
 
-    for ( ; *mp; mp++) {
-        for (i = 0; i < ARRAY_SIZE(dirs); i++) {
-            fname = g_strdup_printf("%s/%s%s", dirs[i], *mp, HOST_DSOSUF);
-            ret = module_load_file(fname);
-            g_free(fname);
-            fname = NULL;
-            /* Try loading until loaded a module file */
-            if (!ret) {
-                break;
-            }
+    for (i = 0; i < ARRAY_SIZE(dirs); i++) {
+        fname = g_strdup_printf("%s/%s%s%s",
+                dirs[i], prefix, lib_name, HOST_DSOSUF);
+        ret = module_load_file(fname);
+        g_free(fname);
+        fname = NULL;
+        /* Try loading until loaded a module file */
+        if (!ret) {
+            break;
         }
     }
 
diff --git a/vl.c b/vl.c
index fca0487167..fd321e2fd4 100644
--- a/vl.c
+++ b/vl.c
@@ -507,6 +507,43 @@ static QemuOptsList qemu_fw_cfg_opts = {
     },
 };
 
+#ifdef CONFIG_LIBISCSI
+static QemuOptsList qemu_iscsi_opts = {
+    .name = "iscsi",
+    .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head),
+    .desc = {
+        {
+            .name = "user",
+            .type = QEMU_OPT_STRING,
+            .help = "username for CHAP authentication to target",
+        },{
+            .name = "password",
+            .type = QEMU_OPT_STRING,
+            .help = "password for CHAP authentication to target",
+        },{
+            .name = "password-secret",
+            .type = QEMU_OPT_STRING,
+            .help = "ID of the secret providing password for CHAP "
+                    "authentication to target",
+        },{
+            .name = "header-digest",
+            .type = QEMU_OPT_STRING,
+            .help = "HeaderDigest setting. "
+                    "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}",
+        },{
+            .name = "initiator-name",
+            .type = QEMU_OPT_STRING,
+            .help = "Initiator iqn name to use when connecting",
+        },{
+            .name = "timeout",
+            .type = QEMU_OPT_NUMBER,
+            .help = "Request timeout in seconds (default 0 = no timeout)",
+        },
+        { /* end of list */ }
+    },
+};
+#endif
+
 /**
  * Get machine options
  *
@@ -3017,6 +3054,9 @@ int main(int argc, char **argv, char **envp)
     qemu_add_opts(&qemu_icount_opts);
     qemu_add_opts(&qemu_semihosting_config_opts);
     qemu_add_opts(&qemu_fw_cfg_opts);
+#ifdef CONFIG_LIBISCSI
+    qemu_add_opts(&qemu_iscsi_opts);
+#endif
     module_call_init(MODULE_INIT_OPTS);
 
     runstate_init();